DERR-2024-006371

195 North 1950 West
Mailing Address: P.O. Box 144840 Salt Lake City, UT 84114-4840
Telephone [phone] ) 359-8853 [phone]
www.deq.utah.gov
Printed on 100% recycled paper
State of Utah

SPENCER J. COX
Governor

DEIDRE HENDERSON
Lieutenant Governor
Department of
Environmental Quality

Kimberly D. Shelley
Executive Director

DIVISION OF ENVIRONMENTAL
RESPONSE AND REMEDIATION

Brent H. Everett
Director
ERRC-061-24

April 23, 2024

Adam Plonsky
Manager, BU Environmental Compliance
Dominion Energy
2221 Westgate Drive
Rock Springs, Wyoming 82901

RE: Response to Comments to Questar Gas Company Salt Lake Operations Facility
Revised Operations and Maintenance Manual

Dear Mr. Plonsky:

The Utah Department of Environmental Quality, Division of Environmental Response and
Remediation (DERR), has reviewed the Questar Gas Company Salt Lake North Operations Facility
Revised Operations and Maintenance Manual following the response to comments received on
April 2, 2024. The DERR has no additional comments and concurs with finalizing the document.

request to change the frequency of groundwater
sampling at the site from semi-annual sampling to annual sampling and the possibility of eliminating
the analysis of semi-volatile organic compounds (SVOCs) after eight sampling events. The DERR
agrees with the proposed change; however, this will be contingent on the results of future sampling
activities, and if deemed necessary (i.e. there is a noticeable fluctuation in contaminant levels
between events or SVOCs remain present), may revert to a semi-annual sampling frequency and/or
continuing to analyze for SVOCs.

If you have any questions, please contact me at [phone].

Sincerely,

Kelsey Robinson, Project Manager
Division of Environmental Response and Remediation

KR/lg

April 2, 2024

BY EMAIL

Kelsey Robinson
Utah Division of Environmental Response and Remediation
195 North 1950 West
P.O. Box 144880
Salt Lake City, Utah 84114-4880

RE: Comments to Questar Gas Company Salt Lake Operations Facility Operations and
Maintenance Manual

Dear Ms. Robinson:

Questar Gas Company (dba Dominion Energy Utah) is pleased to provide these responses to Utah
Division of Environmental Response and Remediation (Division) comments regarding the Questar
Gas Company Salt Lake Operations Facility Operations and Maintenance Manual, November
2023 that were received in an e-mail dated January 16, 2024. For ease of review, Division
comments have been copied below, with Questar Gas Company responses below each comment
in italicized text.

Comment 1. Table of Contents: This section does not include page references to ‘Table of
Contents’ or ‘Acronyms and abbreviations.’ The DERR recommends adding these sections to the
Table of Contents.

Response 1: Agreed. “Table of Contents” and “Acronyms and Abbreviations” have been added
as pages i and ii, respectively, in the Table of Contents.

Comment 2. Acronyms and Abbreviations: Please correct the definition for BTEXN to read
‘benzene, toluene, ethylbenzene, total xylene, and naphthalene’, as this is how it is defined in the
body of the report (Page 4, Section 4.2). Conversely, if this was not the intended definition, please
correct it accordingly.

Response 2: Comment noted. The acronym “BTEXN” has been removed from the report as a result
of implementing Comment No. 7.

Comment 3. Acronyms and Abbreviations: Please remove the reference to milligrams per cubic
meter, as it is not used within the body of the report.
Utah Department of Environmental Quality
April 2, 2024
2

Response 3: Agreed. the acronym “mg/m3” has been removed from the “Acronyms and
Abbreviations” section.

Comment 4. Page 1, Section 1.0 Background, Paragraph 1, Sentence 1: This sentence defines
‘O&M Manual’ as ‘Operation and Maintenance Manual’. The DERR recommends adding this to
the ‘Acronyms and Abbreviations’ section, as it is not listed.

Response 4: Agreed. The acronym “O&M” has been added to the “Acronyms and Abbreviations”
section of the report.

Comment 5. Page 2, Section 4.0 Annual Groundwater Monitoring, Paragraph 1, Sentence 2: This
sentence refers to ‘UDEQ’. However, this acronym has not been previously defined in the body of
the report. Please define this acronym in this section of the report.

Response 5: Agreed. The acronym “UDEQ” has been defined on first use in the text.

Comment 6. Page 3, Section 4.2 Groundwater Monitoring Program, Paragraph 1, Sentence 1: This
sentence indicates that monitoring will be conducted during the fall of each year. Information from
the Questar Gas Company Salt Lake North Operations Facility Revised Remedial Action Plan
indicated that the next monitoring event is anticipated to be conducted in Spring 2024. Please
expend upon this and confirm if monitoring will be conducted in both spring and fall of 2024.

Response 6: Agreed. Monitoring will only be conducted in the fall of 2024. The text has been
updated as follows: “Groundwater will be monitored annually during the fall of each calendar
year. The next sampling event will take place in Fall 2024.”

Comment 7. Page 3, Section 4.2 Groundwater Monitoring Program, Paragraph 1, Sentence 3: This
sentence indicates that samples will be analyzed for BTEXN. The DERR recommends that
samples be analyzed for volatile organic compounds (VOCs) by EPA Method 8260B and for semi-
volatile organic compounds (SVOCs) by EPA Method 8070C, given that certain analytes besides
BTEXN are present above maximum contaminant levels (MCLs) within the boundaries of the
slurry wall and that previous sampling reports analyze samples for VOCs and SVOCs.

Response 7: Agreed. The text has been revised as follows:
“Samples will be analyzed for volatile organic compounds (VOCs) by United States
Environmental Protection Agency (USEPA) analytical method SW-846 8260B. Samples will also
be analyzed for semi-volatile organic compounds (SVOCs) by EPA Method 8070C for a period
of eight sampling events. Discontinuation of SVOC analyses will be evaluated and discussed with
UDEQ if detections remain below MCLs after eight sampling events.”

Utah Department of Environmental Quality
April 2, 2024
3

Comment 8. Page 4, Section 4.4 Static Water Level Equipment and Measurement Procedure,
Paragraph 1, Last Sentence: This sentence refers to ‘amsl’. However, this acronym has not been
previously defined in the report. Please define this acronym and also include It with the
‘Acronyms and Abbreviations’ section of the report.

Response 8: Agreed. The acronym “amsl” is only used once, in this location of the text. Therefore,
the acronym was deleted. No change was made to the “Acronyms and Abbreviations” section of
the report.

Comment 9. Page 5, Section 4.6 Low Stress Peristaltic pump, Paragraph 1, Sentence 3: This
sentence refers to ‘pH’ and ‘ORP’. However, these acronyms have not been previously defined in
the report. Please define these acronyms and also include them within the ‘Acronyms and
Abbreviations’ section of the report.

Response 9: Agreed. The definitions for “pH” and “ORP” have been added to this sentence and
defined in the “Acronyms and Abbreviations” section of the report.

Comment 10. Page 7, Section 4.10 Groundwater Monitoring Documentation Procedures, Last
Bullet Point: The acronym ‘COC’ is referenced. However, this acronym has not been previously
defined in the body of the report. Please define this acronym in this section of the report.

Response 10: Agreed. The definition for “COC” has been added to this sentence and defined in
the “Acronyms and Abbreviations” section of the report.

Comment 11. Page 9, Section 4.16 Screening Criteria, Sentence 1: This sentence defines
‘MCLs’ as ‘maximum contaminant levels’. The DERR recommends adding this to the
‘Acronyms and Abbreviations’ section, as it is not listed.

Response 11: Agreed. “MCLs” has been added to the “Acronyms and Abbreviations” section of
this report.

Comment 12. Figure 2 Site Map: This figure outlines a ‘New Building Dimension’ at the Site.
This Building appears to have already been expanded based on recent aerial photographs. The
DERR recommends updating the figure with current aerial imagery and also confirming if this
expansion had any effect on the integrity of SWP-1.

Response 12: Agreed. The figure has been updated with current aerial imagery. The expansion
did not have any effect on the integrity of SWP-1.

Comment 13. Appendix A: The list in Appendix A references a ‘Well Development Form.’
However, there is not a form provided. Please provide the referenced form.

Utah Department of Environmental Quality
April 2, 2024
4

Response 13: Agreed. The “Well Development Form” has been added to the pdf.

Please contact me at [e-mail] or 307-371-0966 with any additional
questions or comments.

Sincerely,

Adam Plonsky
Manager, BU Environmental Compliance

CC: Lawrence Cannon, AECOM
Kris Benson, Questar Gas Company

Enclosure: Questar Gas Company Salt Lake North Operations Facility Operation and
Maintenance Manual

QUESTAR GAS COMPANY
S ALT LAKE NORTH OPERATIONS FACILITY
Operation and Maintenance Manual
Prepared by
October 2023
Revised March 2024
March 2024 Page i

TABLE OF CONTENTS
TABLE OF CONTENTS .......................................................................................................... i
ACRONYMS AND ABBREVIATIONS.................................................................................. ii
1.0 BACKGROUND ............................................................................................................ 1
2.0 ANNUAL SLURRY WALL INSPECTION .................................................................... 1
3.0 ANNUAL SURFACE CAP INSPECTION ...................................................................... 2
4.0 ANNUAL GROUNDWATER MONITORING ............................................................... 2
4.1 Purpose of Groundwater Sampling ................................................................... 2
4.2 Groundwater Monitoring Program.................................................................... 3
4.3 Well and Piezometer Rehabilitation.................................................................. 4
4.4 Static Water Level Equipment and Measurement Procedure ................................. 4
4.5 Groundwater Sampling Equipment ................................................................... 4
4.6 Low Stress Peristaltic Pump ............................................................................ 5 4.7 Hydrasleeve.................................................................................................. 5
4.8 Equipment Calibration ................................................................................... 6
4.9 QA/QC Sample ............................................................................................. 6
4.10 Groundwater Monitoring Documentation Procedures .......................................... 6
4.11 Sample Identification and Labeling .................................................................. 7 4.12 Chain-Of -Custody Procedures ......................................................................... 7
4.13 Sample Shipping ........................................................................................... 8
4.14 Decontamination Procedures ........................................................................... 8
4.15 Investigation-Derived Waste ........................................................................... 9
4.16 Screening Criteria .......................................................................................... 9
5.0 REPORTING.................................................................................................................. 9
6.0 HEALTH AND SAFETY ............................................................................................... 9
7.0 REFERENCES ............................................................................................................. 10

TABLES
Table 1 Monitoring Well Location s
Table 2 Groundwater Level Locations
Table 3 Screening Criteria

FIGURES
Figure 1 Location Map
Figure 2 Site Map
Figure 3 Slurry Wall and Surface Cap Location
Figure 4 Proposed Sampling Wells and Piezometers

APPENDICES
Appendix A – Field Forms
Appendix B – Hydrasleeve Sampling Procedure

Operation and Maintenance Manual
Questar Gas Company
March 2024 Page ii
ACRONYMS AND ABBREVIATIONS

bgs below ground surface
CGR coal gasification residuals
COC chain-of -custody
IDW investigation -derived waste
MCL maximum contaminant levels
mg/L milligrams per liter
O&M Operations and Maintenance
ORP oxidation reduction potential
pH potential of hydrogen
QA/QC Quality Assurance / Quality Control
QGC Questar Gas Company
RAP Remedial Action Plan
SVOC semi-volatile organic compound
UDEQ Utah Department of Environmental Quality
USEPA United States Environmental Protection Agency
VOC volatile organic compound

Operation and Maintenance Manual
Questar Gas Company
March 2024 Page 1
1.0 BACKGROUND
This revised Operation and Maintenance Manual (O&M) Manual is a supplement to the Revised
Remedial Action Plan (RAP) (AECOM, 2023) for the Questar Gas Company (QGC), Salt Lake
Operations Center, and replaces the 1989 Operations and Maintenance Manual (Dames and
Moore, 1989). The remedy outlined in the RAP consists of hydraulic containment without
groundwater extraction. The remedy will be implemented via assessment of the existing slurry
wall, inspection and maintenance of a surface cap, and groundwater monitoring.

Questar Gas Company’s Salt Lake Operations Center is located at 1140 West 200 South in Salt
Lake City, Utah (Figure 1 ). The former Utah Gas & Coke Company property which produced
synthetic gas by coal gasification between 1908 and 1929 (Dames & Moore, 1988) was located in
the northeast portion of the Operations Center and is referred to as the North Operations Facility
(the site) in the historical documents related to this project.

The function of the slurry wall is to isolate the coal gasification residuals (CGR) source area within
the slurry wall and prevent CGR in the shallow aquifer from migrating off -Site . The total length
of the slurry wall is approximately 2,400 feet. The slurry wall is keyed into the clay layer typically
encountered at a depth of approximately 18-23 feet below ground surface (bgs). The slurry wall
extends into the underlying clay layer a minimum depth of three feet and has a minimum width of
approximately two feet (Dames and Moore, 1988). The location of the perimeter slurry wall and
monitoring wells and piezometers are shown on Figure 2 .

The area within the slurry wall is typically utilized for parking, either paved with asphalt or
concrete, or covered with buildings, with the exception of some small, landscaped areas in the
southern part of the site along 100 South Street. Th is developed area serves as a low permeability
cap (surface cap) to minimize surface water infiltration , which can reduce mobility of the CGR
source beneath the Site. The locations of the perimeter slurry wall and surface cap are shown on
Figure 3 .

2.0 ANNUAL SLURRY WALL INSPECTION
Assessment of the slurry wall will take place annually and will consist of a visual inspection and
assessment of hydraulic gradients.

The field inspector will walk the perimeter of the slurry wall (see Figure 3 ) and visually inspect
for potential issues such as the items listed below. An example annual inspection form is provided
in Appendix A .

• Subsurface subsidence or ponding of water near or over the slurry wall,
• New deep-rooted plants within 15 feet of the slurry wall,
• Land disturbance over the slurry wall (i.e., excavations or new construction), and
• Animal burrows within 15 feet of the slurry wall, other than mice and other small rodents.

Onsite activities with the potential to impact the slurry wall will be monitored throughout the year.
For example, directional drilling will not be allowed within 25 feet of the slurry wall without
Operation and Maintenance Manual
Questar Gas Company
March 2024 Page 2
additional evaluation . Loading of the surface directly over the slurry wall will be avoided to the
extent possible (i.e., large soil piles). In addition, to the extent possible, new deep-rooted
vegetations (trees) will not be planted within 15 feet of the slurry wall.

Hydraulic gradients will be assessed as part of the annual slurry wall inspection event. The
assessment will include calculation of hydraulic gradients 1) upgradient f ro m the site, 2) within
the slurry wall area, 3) down gradient of the site, and 4) across the paired slurry wall piezometers.
The calculated gradients are expected to be an order of magnitude different from the pre slurry
wall gradient of 0.003 to 0.004 feet per foot (Dames and Moore, 1988). The associated
potentiometric surface maps will present groundwater flow directions for each area as listed above.
Groundwater measurement procedures are described in Section 4.4 .

3.0 ANNUAL SURFACE CAP INSPECTION
The surface cap (parking areas, roads, building footprint, see Figure 3 ) will be inspected on an
annual basis and the parking lot area will be inspected for excessive cracking. If excessive cracking
is identified, the area will be evaluated and repaired as necessary to prevent infiltration to the
subsurface within the slurry wall area. The contribution of small unpaved areas (i.e., landscaping)
to subsurface infiltration is anticipated to be insignificant, and as such, these areas will be left
undisturbed. Consistent with current operations, any future construction, excavation, or subsurface
installations will continue to be limited by QGC such that they do not interfere with the
functionality of the surface cap. Inspections records will be maintained onsite. An example annual
inspection form is provided in Appendix A .

The stormwater system will also be visually inspected annually to verify that stormwater is being
collected and conveyed outside of the slurry wall area. Areas to inspect include rain gutters, the
concrete gutter system, and stormwater collections boxes within the slurry wall.

4.0 ANNUAL GROUNDWATER MONITORING
The annual groundwater monitoring program presented in this O&M Manual is based on 30 plus
years of semi-annual sampling events between 1992 and 2023, which demonstrate that
groundwater impacts beneath the site are well understood, delineated, and are not migrating. The
monitoring described herein is based on the recommendations presented in the Soil Gas and
Groundwater Investigation Summary Report (AECOM, 2022) and approved by the Utah
Department of Environmental Quality (UDEQ) on January 5, 2023 (UDEQ, 2023).

4.1 Purpose of Groundwater Sampling
Groundwater sampling will be performed at the site to confirm ongoing plume stability (i.e., plume
is not migrating) and natural attenuation (i.e., contaminant mass is decreasing) of the groundwater
plume. Six monitoring wells will be sampled on an annual basis. Three of the wells are located
within the groundwater plume (source wells) and will monitor natural attenuation of the plume.
Three of the monitoring wells are downgradient of the plume (sentry wells) and will verify that
plume migration is not occurring.

Operation and Maintenance Manual
Questar Gas Company
March 2024 Page 3
4.2 Groundwater Monitoring Program
Groundwater will be monitored annually during the fall of each calendar year. The next sampling
event will take place in Fall 2024. Samples will be collected from six monitoring wells as listed in
Table 1 below. Sample s will be analyzed for volatile organic compounds (VOCs) by United States
Environmental Protection Agency (USEPA ) analytical method SW-846 8260B. Samples will also
be analyzed for semi-volatile organic compounds (SVOCs) by EPA Method 8070C for a period
of eight sampling events. Discontinuation of SVOC analyses will be evaluated and discussed with
UDEQ if detections remain below MCLs after eight sampling events

Table 1
Monitoring Well Locations

Well ID Status Well Type
MW-101 Proposed New Well Source Area Well MW-102
SW-1 Existing Well
MW-103 Proposed New Well
Sentry Well MW-12 Existing Well M-10

The groundwater monitoring network will be assessed annually to confirm that groundwater
impacts have not migrated past sentry wells, and recommendations will be presented in the annual
report if deficiencies are identified . If sampling results indicate migration of an existing plume is
occurring, or a potential new release has occurred, it will be documented in the report and an
appropriate response will be discussed with UDEQ. Additional details regarding groundwater
sampling methods and procedures are provided in Section 4.4 through Section 4.1 5 .

If at any time a well that is currently part of the monitoring program is found to be unusable, it
will be evaluated to see if it can be repaired prior to the next sampling event. If it is determined
that the well cannot be repaired, the well will be replaced, or a substitute well will be selected and
UDEQ will be contacted for approval.

During the annual groundwater monitoring event, depth to groundwater will be measured at 6
wells and 9 piezometers. Locations are shown on Figure 4 and are listed in Table 2 below. Depth
to groundwater measurements will be used to calculate groundwater elevations and p otentiometric
surface maps will be generated for the areas upgradient of the site, inside the slurry wall, and
downgradient of the site. Further details regarding the water level measurement procedures are
provided in Section 4.4 .

Operation and Maintenance Manual
Questar Gas Company
March 2024 Page 4
Table 2
Groundwater Level Locations

Well ID Status Well Type
MW-101 Proposed New Well Source Area Well
(Sample and Water Level) MW-102
SW-1 Existing Well
MW-103 Proposed New Well Sentry Well
(Sample and Water Level) MW-12 Existing Well M-10
PZ-1
Proposed New Piezometer
Piezometer
(Water Level)
PZ-2
PZ-3
SWP-1
Existing Wall Piezometer
SWP-2
SWP-3
SWP-4
SWP-5
SWP-6
4.3 Well and Piezometer Rehabilitation
Monitoring wells and piezometers listed in Table 2 should be redeveloped on a as needed basis
and the surface completions inspected annually. Damaged well completions will be replaced as
needed. Wells and piezometers will be redeveloped using a submersible pump, bailer, or foot valve
pump. Purge water from well development will be containerized and properly disposed of as
Investigation -Derived Waste according to Section 4.1 5 . An example well development form is
included in Appendix A .

4.4 Static Water Level Equipment and Measurement Procedure
The water level in all wells as noted in Table 2 will be measured before any wells are purged or
Hydrasleeves are deployed. Depth to groundwater will be measured with an electronic dual
interface probe or water level meter, and the measurement will be recorded on the Static Water
Level Log form (Appendix A ). The water level indicator will be lowered into the well until a
change in conductivity indicates that groundwater has been encountered. The depth to water will
be measured from the reference point at the top of the well casing. If the reference point cannot be
located, the depth will be measured from the north side of the casing. All measurements will be
made to +0.01 foot. Field measurements will be used in conjunction with the surveyed elevations
of the top of each well or piezometer casing to determine the groundwater surface elevation (above
mean sea level).

4.5 Groundwater Sampling Equipment
Monitoring wells will be sampled with a peristaltic pump via low stress purging or using a
Hydrasleeve (or similar device s).

Operation and Maintenance Manual
Questar Gas Company
March 2024 Page 5
4.6 Low Stress Peristaltic Pump
Wherever possible, monitoring wells will be purged and sampled using “low-stress” techniques.
Each monitoring well will be purged and sampled at a rate less than or equal to 0.3 liters per minute
until field -measured parameters stabilize to ensure groundwater is representative of the aquifer
before samples are collected. At a minimum, the parameters of potential of hydrogen (pH),
conductivity, oxidation reduction potential (ORP), and temperature will be monitored during
purging using portable calibrated meters. Parameters will be measured every three minutes during
purging.

At least two consecutive field measurements made three minutes apart shall fall within the ranges
stated below before well purging will be considered complete:

• pH = ±0.2 units,
• temperature = ±1 degree Centigrade (ºC),
• conductivity = ±10 percent, and
• ORP = ±10 percent.

With the exception of low-yield monitoring wells, groundwater samples will be collected
immediately after field -measured parameters have stabilized. Groundwater samples will be
collected in appropriate sample containers supplied by the analytical laboratory. New or dedicated
pump tubing will be used at each monitoring well. Groundwater samples will be placed in the
appropriate sample containers. Sa mples requiring cooling will be stored in an ice-chilled cooler.

Depth to groundwater will be measured every three minutes during purging and drawdown will be
limited to one foot. The pumping rate will be reduced if drawdown is greater than one foot. If
drawdown cannot be limited to one foot, then the well will be purged dry and allowed to recover
to 75 percent prior to sample collection. A groundwater sampling form will be completed at each
sampling location at the time of sampling. The groundwater sampling form is included in
Appendix A .

4.7 Hydrasleeve
Monitoring wells with a water column of 5 feet or greater (and free of CGR) can be sampled using
a passive no purge (grab) sampling device such as a Hydrasleeve. Groundwater quality parameters
(e.g., pH, conductivity, temperature, and oxidation-reduction potential [ORP]) will not be
measured in the field due to limited groundwater volume recovered. The collection of the
groundwater sample using a Hydrasleeve causes only minimal disturbance of the water column
and retrieval of the device causes no significant drawdown in the well until the sample is
withdrawn from the well. Hydrasleeve samplers must be deployed and redrawn from the screen
interval only. Sample s collected from above the screened interval should be discarded. Passive
(no -purge) sampling devices like the Hydrasleeve are designed to collect formation -quality water,
under undisturbed (non-pumping) natural flow conditions. Samples collected using a Hydrasleeve
generally provide a good quality sample and are similar to samples collected using low-flow
purging and sampling methods. A groundwater sample form will be completed at each sampling
location at the time of sampling (Appendix A). A Hydrasleeve sampling procedure is provided in
Appendix B.
Operation and Maintenance Manual
Questar Gas Company
March 2024 Page 6

4.8 Equipment Calibration
Routine maintenance and calibration of equipment (e.g. water level meter, water quality meter)
will be followed in accordance with manufacturer guidance. Equipment will be inspected and
calibrated at the start of each field day, as applicable. Instrument calibration will be checked if
unexpected or unexplained readings are obtained, and the instrument will be re-calibrated, if
necessary. Calibration details will be recorded on a separate equipment calibration log and
provided with the field documentation (Appendix A ).

4.9 QA/QC Sample
Quality Assurance/Quality Control (QA/QC) samples to be collected include one field duplicate
and a trip blank collected for each cooler containing samples for VOC analysis. Data validation
will not be performed for routine monitoring.

4.10 Groundwater Monitoring Documentation Procedures
All data generated during monitoring will be entered directly into the appropriate sampling log
forms using permanent, indelible ink. Photographs also may be taken to document field activities.

Typical field log form entries may include the following:

• Location, description, and photographs, if applicable of the sampling point,
• Details of the sampling site (e.g., the elevation of the casing, casing diameter and depth,
integrity of the casing),
• Documentation of procedures for preparation of reagents or supplies which become an
integral part of the sample (e.g., filters and absorbing reagents),
• Documentation of calibration procedures for field instruments,
• Identification of sampling crew members,
• Matrix of sample (e.g., groundwater),
• Number and volume of sample taken,
• Sampling methodology,
• Sample preservation,
• Date and time of collection,
• Collector's sample identification number(s),
• Sample distribution and transportation method,
• References such as maps of the sampling site,
• Field observations,
• Any field measurements made (e.g., pH, temperature, conductivity, and water depth),
• Decontamination procedures, and
• Signature and date by the personnel responsible for observations.

Activity -specific field forms must be completed during field sampling activities. Examples of these
types of forms are presented in Appendix A:

Operation and Maintenance Manual
Questar Gas Company
March 2024 Page 7
• Static Water Level Log,
• Groundwater Sampling Form ,
• Well Development Form
• Equipment Calibration Log, and
• Chain -of-custody (COC) Record.

4.11 Sample Identification and Labeling
Groundwater samples will be labeled in accordance with Questar Gas Company guidance. Sample
IDs will also be recorded in the sampling log.

All sample containers will be labeled at the time of sample collection . Labels will be completed
legibly with permanent ink . The following information will be recorded on the sample label:

• Sample designation,
• Date and time of collection,
• Name or initials of sampler,
• Analysis requested, and
• Preservative.

4.12 Chain-Of-Custody Procedures
The possession and handling of all environmental samples will be traceable from the time of
collection, through analysis, until final disposition . Documentation of the sample history is referred
to as the COC. Required components of the COC program include:

• Sample designation,
• Date and time of collection,
• Matrix type,
• Number of containers,
• Analyses requested,
• Remarks section to relay potential hazards or other information to the laboratory,
• Name and signature of collector,
• Signature of persons involved in the chain of possession,
• Date and time of each change of custody,
• Internal temperature of container when opened at the laboratory, and
• Condition of samples when received by laboratory.

A COC record will be completed and will accompany every sample shipment. In addition, a sample
or shipping container is considered in a person's custody if it is:

• In a person's physical possession,
Operation and Maintenance Manual
Questar Gas Company
March 2024 Page 8
• In view of the person after he or she has taken possession,
• Secured by the person so that no one can tamper with it, or
• Stored in a secured area.

To the extent possible, custody seals should be attached to all shipping containers before the
samples leave the custody of sampling personnel. Samples arriving at the laboratory with missing
or broken seals will not be rejected. Signed and dated seals will be attached so that they must be
broken in order to open shipping containers.

4.13 Sample Shipping
Samples will be packaged and delivered or shipped by the sampler within the applicable hold time
to a Utah Certified Laboratory. Groundwater samples will be placed on ice in an insulated cooler
for shipment and cooled to the required temperature of ≤6 °C as quickly as possible.

Sampling personnel will deliver samples to local laboratories or will deliver samples to a shipping
carrier for overnight delivery to non-local laboratories. If the samples are shipped via an overnight
carrier, the following procedure will be used for packaging:

• In sert cushioning material in the bottom of the cooler,
• Line the cooler with a large plastic bag,
• Seal each sample container in a resealable plastic bag and place upright in the cooler,
• Place wet ice and additional packaging materials around the containers,
• Include a temperature blank in each cooler,
• Place pertinent paperwork such as the COC form in a resealable plastic bag and tape to
the inside lid of the cooler,
• Attach signed custody seal to the cooler in two places and cover with clear tape in such a
way that the custody seal must be broken to open the cooler,
• Seal the cooler with packaging tape, and
• Affix a shipping label to the outside of the cooler.

4.14 Decontamination Procedures
All dedicated, non-dedicated, and/or non-disposable sampling equipment will be thoroughly
decontaminated before each use, between each location, and at the completion of the sampling
program. The following procedures will be used:

• Clean equipment thoroughly in non-phosphate detergent solution using brushes as
necessary,
• Rinse thoroughly with tap water,
• Rinse thoroughly with deionized or distilled water, and
• Allow equipment to air dry.

Between use, equipment will be stored in plastic bags or dedicated cases to prevent contamination
from dust or soil. All downhole equipment used for sampling monitoring wells or measuring water
levels will be thoroughly cleaned to remove any visible soil, sediment, or residue prior to use at
Operation and Maintenance Manual
Questar Gas Company
March 2024 Page 9
each location. Equipment will be decontaminated before each use by washing with a non-
phosphate detergent solution and triple rinsing with deionized or distilled water. New or dedicated
sampling tubing will be used at each sample location.

4.15 Investigation-Derived Waste
Investigation -Derived Waste (IDW) will consist of water used to decontaminate sampling
equipment, purge water from monitoring well sampling, and solids such as used tubing and
personal protective equipment. IDW will be containerized , characterized, and properly disposed
of. Other wastes such as packaging materials, and general refuse will be disposed of in an onsite
municipal waste dumpster.

4.16 Screening Criteria
Groundwater analytical data will be screened against USEPA maximum contaminant levels
(MCLs) (USEPA, 2023) as shown in Table 3 below.

Table 3
Screening Criteria

Analyte MCL
(mg/L)
Benzene 0.005
Toluene 1.0
Ethylbenzene 0.70
Total Xylene 10
Naphthalene MCL Not Established
mg/L – milligrams per liter
5.0 REPORTING
An annual monitoring report will be prepared and submitted to UDEQ after completion of the
groundwater monitoring event. The report will summarize field activities, observed field
anomalies, analytical results, and include conclusions or recommendations. The report will also
include site figures, summary tables, and copies of field forms, and laboratory analytical reports.

6.0 HEALTH AND SAFETY
Prior to undertaking any environmental activities at the site, the site-specific Environmental,
Health, Safety and Site Management Plan will be reviewed and followed (Dominion, 2017). In
addition to this plan, all contractors to Questar Gas Company will review the Contractors Health
and Hazard Advisory outlin ing health and safety precautions for the site. The Environmental,
Health, Safety and Site Management Plan includes notice requirements to construction,
underground utility, and environmental workers who could be exposed to subsurface soil and
groundwater conditions beneath the site so they are informed of potential dangers and can take
appropriate safety measures to address potential health risks associated with environmental
conditions.

Operation and Maintenance Manual
Questar Gas Company
March 2024 Page 10
7.0 REFERENCES
AECOM, 2023. Questar Gas Company, Salt Lake North Operations Facility, Revised Remedial Action
Plan. August 2023.
UDEQ, 2023. Re: Soil Gas and Groundwater Investigation Report, Questar Gas Company, Salt Lake North
Operations Center December 2022. January 5, 2023.
USEPA. 2023. Drinking Water Contaminants and Maximum Contaminant Levels (MCLs)
https://www.epa.gov/risk/regional-screening-levels-rsls-generic-tables.
AECOM, 2022. Dominion Energy Services Inc., Soil Gas and Groundwater Investigation Summary Report
December 2022.
Dominion, 2017. Dominion Questar Gas Company Environmental, Health, Safety & Site Management Plan
North Operations Center Salt Lake City, Utah. May, 2017.
Dames and Moore, 1989. Operations and Maintenance Manual, Ground Water Extraction. Revision,
February 10, 1989.
Dames and Moore, 1988. Site Investigation and Proposed Remedial Action Plan. August 9, 1988.
Dames and Moore, 1986. Mountain Fuels Supply Company Operations Center Remedial Action Strategy
(RAS). April 10, 1986.

Revised Remedial Action Plan
Questar Gas Company
March 2024

FIGURES
Revised Remedial Action Plan
Questar Gas Company
March 2024

APPENDIX A

Example Field Sampling Forms
• Slurry Wall Inspection Form
• Surface Cap Inspection Form
• Well Development Form
• Daily Field Record
• Groundwater Sampling Form
• Static Water Level Log
• Equipment Calibration Log
• COC Record

SLURRY WALL INSPECTION FORM
DOMINION ENERGY – SALT LAKE NORTH OPERATIONS FACILITY

Page 1 of 1
Date of Inspection: Weather Conditions: Inspector's Name/Title:
Item Yes/No Comments/Locations Repair Action Taken Date Repairs
Complete
1. Evidence of subsurface
subsidence or ponding of
water near or over the slurry
wall?

2. Any deep-rooted
vegetation within 15 feet of
the slurry wall (i.e. trees or
shrubs)?

3. Any evidence of land
disturbing activities observed
within 25 feet of wall (i.e.
drilling, excavation,
construction)?

4. Surface clear of obstructions
(i.e. soil piles, equipment,
storage)?

5. Any evidence of large
animal burrows within 15 feet
of the slurry wall?

SURFACE CAP INSPECTION FORM
DOMINION ENERGY – SALT LAKE NORTH OPERATIONS FACILITY

Page 1 of 1
Date of Inspection: Weather Conditions: Inspector's Name/Title:
Item Types of Problems
Condition Present? Observations, Exact Location of Issue
Date and Nature of Repairs/Actions Yes No
Cap
Inspection
Unsealed Surface Cracks?

Subsidence and
Settlement of the
pavement?

Stormwater
system
inspection
Do rain gutter downspout discharge to stormwater system?

Ponding of water near rain
gutter downspouts?

Damage to the concrete
gutters?

Ponding of water on the
parking lot, concrete or
asphalt surfaces?

Build up of
sediment or debris in the stormwater
catch basins?

Blockage of
stormwater influent or
effluent piping?

Well Location:
Date:Project Name:Project No:
AECOM Staff Onsite:Time Onsite:
Other Personnel Onsite:Time Offsite:
Well ID:*Calculated Purge Vol. (gal):Water Quality Meter:
Date:Actual Purge Vol. (gal):Serial Number:
Total Depth (ft BTOC):Purge Method/Equipment:Cal Log Attached:
Depth to Water (ft BTOC):Other Equipment:
Height of Water Column (ft):Depth of Pump Intake (ft BTOC):Serial Number:
Borehole Diameter (in):Start of Purging:Cal Log Attached:
Casing Diameter (in):End of Purging:Flow Rate (gpm):
Prepared By:Date:Page:
of
*pH ***Turb
(NTU)Clarity Color Notes and Comments
Show Purge Volume Calculation Here:
H(ft) = ________________ Annulus Volume (ft3) = ________________ Casing Volume (ft3) = _______________
Purge Volume (ft3) = _______________ Calculated Purge Volume (gallons) = _______________
**Stabilization Requirements: <10% difference over three readings; ***Stabilization Requirements: <5 NTU Turbidity
*Calculate Purge Volume (ft3) = 5 x (Annulus Volume+Casing Volume), where Annulus Volume (ft3) = [H x pi x ((Borehole Diameter/12 x 0.5)2-(Casing Diameter/12 x 0.5)2) x 30%] and
Casing Volume (ft3) = H x pi x (Casing Diameter/12 x 0.5 )2 . Purge Volume (gallons) = 5 x (Annulus Volume (ft3)+Casing Volume(ft3)) x 7.48 gal/ft3
; where H (ft) = Total Depth (ft) - Depth to Water (ft)
Example, where H (ft) = 20 - 8 = 12 ft; borehole diameter = 8.25 in; casing diameter = 2 in
Annulus Volume (ft3) = [12 x pi x ((8.25/12x0.5)2 -(2/12x0.5)2) x 30%] = 1.26 ft3 Casing Volume (ft3) = 12 x pi x (2/12x0.5)2 = 0.262 ft3
Calculated Purge Volume (ft3) = 5 x (1.26 ft3 + 0.262 ft3) = 7.61 ft3; Calculated Purge Volume (gallons) = 7.61 ft3 x 7.48 gal/ft3 = 56.9 gallons (or 4.74 gal/foot)
WELL DEVELOPMENT LOG
Well/Purge Information
Time Vol Removed
(gal)
**Temp
(◦C)
**Cond
(µS/cm)
Rev 0 2019-07
'DWH3URMHFW1DPH3URMHFW1R
$(&206WDII2QVLWH7LPH2QVLWH
2WKHU3HUVRQQHO2QVLWH7LPH2IIVLWH
7DLOJDWH6DIHW\&RQGXFWHG<HVƑ
7RSLFV&RYHUHG
6XPPDU\RI7DVNV3HUIRUPHG
6LWH&RQGLWLRQV
(TXLSPHQW8VHG
(TXLSPHQW 6HULDO1XPEHU &DO6WDQGDUG 6WDQGDUG([S'DWH 0HWHU5HDGLQJ 7LPH
)LHOG1RWHV
6LWH6NHWFK
3UHSDUHG%\'DWH3DJH
RI
'DLO\)LHOG5HFRUG
5HY
Date:Project Name:Project No:
AECOM Staff Onsite:Time Onsite:
Other Personnel Onsite:Time Offsite:
Prepared By:Date:Page:
of
Water Level Form
BTOC = Below top of casing
Comment Total Depth
(ft BTOC)
Depth to Water
(ft BTOC)TimeDateLocation ID Depth to NAPL
(ft BTOC)
Rev 0 2019-07
Date:Project Name:Project No:
AECOM Staff Onsite:Time Onsite:
Other Personnel Onsite:Time Offsite:
Instrument:
Model/Serial Number:
Weather:
Date Time Cal Standard Expiration Date Meter Reading Comments
Date Time Cal Standard Expiration Date Meter Reading Comments
Prepared By:Date:Page:
of
Calibration
Calibration Checks
Equipment Calibration Form
Equipment
Rev 0 2019-07
White and Yellow to lab Pink – sample management TAT _________________ Number of Coolers __________ Carrier/Waybill Number ____________________________
CHAIN OF CUSTODY/LABORATORY ANALYSIS REQUEST FORM
URS Corporation  756 East Winchester Street, Suite 400, Salt Lake City, UT 84107  801-904-4000  Fax [phone]
PAGE ____ OF ____
Project Name: Project Number:
ANALYSIS REQUESTED
Project Manager: Report CC:Report CC:
MS
/
M
S
D

To
t
a
l

N
u
m
b
e
r

o
f

C
o
n
t
a
i
n
e
r
s

See reverse side for analytical
constituents, methods, and
preservatives.
REMARKS
Project Location:
Field Contact/Phone #Lab Contact/Phone #
Sampler’s Signature Sampler’s Printed Name
FIELD SAMPLE ID SAMPLE
MATRIX DATE TIME
INVOICE INFORMATION
BILL TO:
URS CORPORATION
PO#______________________________
Matrix Key:
GW = Ground Water
SW = Surface Water
SO= Soil
O = Other __________________
SPECIAL INSTRUCTIONS/COMMENTS
SAMPLE RECEIPT: CONDITION/COOLER TEMP: CUSTODY SEALS: Y N
RELINQUISHED BY RECEIVED BY RELINQUISHED BY RECEIVED BY
Signature Signature Signature Signature
Printed Name Printed Name Printed Name Printed Name
Date/Time Date/Time Date/Time Date/Time
Revised Remedial Action Plan
Questar Gas Company
March 2024

APPENDIX B
Hydrasleeve Sampling Procedure

US Patent No. 6,481,300; No. 6,837,120; No. 9,726,013; others pending

Standard Operating Procedure:
Sampling Groundwater with a HydraSleeve TM

Copyright 2023 EON Products
This guide should be used in addition to field manuals and instructions appropriate to
the chosen sampling device (i.e., HydraSleeve, SpeedBag or Super/Skinny Sleeve).

Find the appropriate field manual and instructions on the HydraSleeve website at http://
www.hydrasleeve.com.

For more information about the HydraSleeve, or if you have questions, contact:
EON Products, Inc.
800-474-2490 / 770-978-9971
[e-mail] or [e-mail]
www.HydraSleeve.com & www.EONPro.com

Copyright, EON Products, Inc. 2023.

Table of Contents
Introduction ........................................................................................................................................... 2
Applications of the HydraSleeve .......................................................................................................... 2
Description of the HydraSleeve ............................................................................................................ 3
Selecting the HydraSleeve Size to Meet Site-Specific Sampling Objectives ...................................... 4
Information Required Before Deploying a HydraSleeve ................................................................. 6
Overview: HydraSleeve Operation & Placement ................................................................................. 7
HydraSleeve Operation ................................................................................................................. 7
HydraSleeve Placement ................................................................................................................ 8
Field Procedures for Sampling with the HydraSleeve ....................................................................... 11
I. Assembling the HydraSleeve ............................................................................................. 11
II. Deploying the HydraSleeve ............................................................................................... 12
III. Allowing the Well to Equilibrate ...................................................................................... 12
IV. HydraSleeve Recovery & Sample Collection .................................................................. 13
V. Sample Discharge .............................................................................................................. 14
VI. Measurement of Field Indicator Parameters .................................................................. 14
VII. Alternate Deployment Strategies ................................................................................... 15
Post-Sampling Activities ..................................................................................................................... 17
References ..................................................................................................................................... 18
Table 1. Dimensions & Volumes of HydraSleeve Standard Models ........................................ 5
Standard Operating Procedure: Sampling Groundwater with the HydraSleeve (patents: 6,481,300; 6,837,120; 9,726,013)
2 Copyright 2023 EON Products

Introduction

The HydraSleeve is classified as a passive (no-purge) grab sampling device, meaning that it is
used to collect groundwater samples directly from the screened interval of a well without having
to purge the well prior to sample collection. When it is used as described in this Standard
Operating Procedure (SOP), the HydraSleeve causes no drawdown in the well (until the sample is
withdrawn from the water column) and only minimal disturbance of the water column, because it
has a very thin cross section and it displaces very little water (<100 ml) during deployment in the
well. The HydraSleeve collects a sample from within the screen only. It excludes water from any
other part of the water column in the well through the use of a self-sealing check valve at the top of
the sampler. It is a single-use (disposable) sampler that is not intended for reuse, so there are no
decontamination requirements for the sampler itself.

The use of passive sampling as a means of collecting representative groundwater samples depends
on the natural movement of groundwater (under ambient hydraulic head) from the formation
adjacent to the well screen through the screen. Robin and Gillham (1987) demonstrated the
existence of a dynamic equilibrium between the water in a formation and the water in a well
screen installed in that formation, which results in formation-quality water being available in the
well screen for sampling at all times. Passive (no-purge) sampling devices like the HydraSleeve
collect this formation-quality water, under undisturbed (non-pumping) natural flow conditions.
Samples collected in this manner generally provide more conservative (i.e., higher concentration)
values than samples collected using well-volume purging, and values equivalent to samples
collected using low-flow purging and sampling (Parsons, 2005).

Applications of the HydraSleeve

The HydraSleeve can be used to collect representative samples of groundwater for all analytes
(volatile organic compounds [VOCs], semi-volatile organic compounds [SVOCs], common metals,
trace metals, major cations and anions, dissolved gases, total dissolved solids, radionuclides,
pesticides, PCBs, explosive compounds, 1,4 Dioxane, PFAS, and all other analytical parameters).

Designs are available to collect samples from wells 1” inside diameter and larger. The
HydraSleeve can collect samples from wells of any yield, including low-yield wells. (McAlary and
Barker, 1987).

The HydraSleeve can collect samples from wells of any depth, and it can be used for single- event
sampling or long-term groundwater monitoring programs. Because of its thin cross section and
flexible construction, it can be used in narrow, constricted or damaged wells where rigid sampling
devices may not fit. Using multiple HydraSleeves deployed in series along a single suspension line
or tether, it is also possible to conduct in-well vertical profiling in wells in which contaminant
concentrations are thought to be stratified.
As with all groundwater sampling devices, HydraSleeves should not be used to collect groundwater
samples from wells in which separate (non-aqueous) phase hydrocarbons (i.e., gasoline, diesel fuel
or jet fuel) are present because of the possibility of incorporating some of the separate-phase
hydrocarbon into the sample.
Standard Operating Procedure: Sampling Groundwater with the HydraSleeve (patents: 6,481,300; 6,837,120; 9,726,013)
3 Copyright 2023 EON Products

Description of the HydraSleeve

The basic HydraSleeve (Figure 1) consists of the following components*:

 Just above the self-sealing check valve at the top of the
sleeve are two white strips with holes (A.) to provide
attachment points for the spring clip or suspension tether.

 A suspension line or tether is fixed to a reusable spring clip
that attaches to the holes in the white strips to deploy the
device into and recover the device from the well. ( Factory
assembled, custom tethers can be purchased from the
manufacturer or tethers can be field assembled using
suspension cord. Suspension cord with depth indicators
marked in 1-foot intervals is available from the
manufacturer.)
 A long, flexible, 4-mil thick lay-flat polyethylene sample
sleeve (C.) sealed at the bottom (this is the sample chamber),
which comes in different sizes, as discussed below with a
transparent, self-sealing, reed-type flexible polyethylene
check valve built into the top of the sleeve (B.) to prevent
water from entering or exiting the sampler except during
sample acquisition.
 At the bottom of the sample sleeve are two holes (D) which
provide attachment points for the weight clip and weight.
 A reusable stainless-steel weight with clip (E) or disposable
zip-tie is attached to the bottom of the sleeve to carry it down
the well to its intended depth in the water column. Bottom
weights are available from the manufacturer in sizes from
0.75” OD to 1.5” OD and are available in a variety of lengths.
An optional top weight may be attached to the top of the
HydraSleeve to carry it to depth and to compress it at the
bottom of the well (not shown in Figure 1).

 A discharge tube is included and is used to puncture the
HydraSleeve after it is recovered from the well so the
sample can be decanted into sample bottles (not shown).

Note: The sample sleeve and the discharge tube are designed for one-time use and are
disposable. The Spring Clip, Weight, Weight-Clip and factory-built Suspension Tethers are
dedicated to the well and may be reused.
A.
Suspension Tether
D
..
E.
.
Standard Operating Procedure: Sampling Groundwater with the HydraSleeve (patents: 6,481,300; 6,837,120; 9,726,013)
Copyright 2023 EON Products 4

Selecting the HydraSleeve Size to Meet Site-Specific Sampling Objectives

It is important to understand that each HydraSleeve collects a finite volume of sample based on the
well diameter, length of saturated screen, and size of HydraSleeve because, after the HydraSleeve is
deployed, there is only one opportunity to collect an undisturbed sample, without waiting again for the
well to recover and return to natural flow conditions again. Thus, the volume of sample required to
meet site-specific sampling and analytical requirements will dictate the size of HydraSleeve needed to
meet these requirements.

There are three types of HydraSleeve, Standard HydraSleeve, Super/SkinnySleeve, and Speedbag.
All three are identical in operation however,
 Standard HydraSleeves have white reinforced strips at the top for connecting to a Spring
Clip fastened to the tether, and are available in Low Density Polyethylene (LDPE)
 SuperSleeves have reusable rigid top collars, are available in longer lengths for additional
volume, and they are available in LDPE for general sampling, or High Density Polyethylene
(HDPE) for PFAS sampling.
 SpeedBags have white reinforcing strips at the top for connecting to a Spring Clip and they
have a pair of 1-inch diameter holes above the top valve and below the reinforcing strips that
allows the Speedbags to be used immediately after installation. They are available in LDPE.
SpeedBags require a longer saturated screen to fill than other HydraSleeves.

The volume of sample collected by the HydraSleeve varies with the diameter and length of the
HydraSleeve. Dimensions and volumes of available HydraSleeve models are detailed in Table 1.

Considerations:

 The length of saturated screen required to fill a HydraSleeves is based on using the correct size
HydraSleeve to match the well diameter. Using a HydraSleeve that is smaller in diameter than
recommended will increase the length of saturated screen necessary to fill the sleeve. For
example, 1.5-inch and 1.75-inch diameter HydraSleeves are the optimum size for two-inch
wells and will fill in about the length of saturated screen listed in Table 1. If one of these
samplers is used in a 4-inch well the saturated screen requirements could be 1.5 or more times
the optimum screen lengths listed.

 When using SuperSleeves in wells 4-inch diameter or larger it is recommended to substitute
4x2 Top Collar Adapters instead of the standard Top Collar Assemblies, so that the
SuperSleeve fills in the shortest saturated screen interval.

 The outside diameter of the Heavy-Duty Universal Super/SkinnySleeves is 1.75" however
some Top Collar Assemblies are larger in diameter. 1.66” Top Collars are recommended for
most cases and must be used for 2-inch sch80 wells. 1.9” Top Collars are used for special
applications and require 2-inch sch 40 well casing and larger.

 Do Not use Top Weights with SpeedBags

Standard Operating Procedure: Sampling Groundwater with the HydraSleeve (patents: 6,481,300; 6,837,120; 9,726,013)
Copyright 2023 EON Products 5

Table 1. Dimensions and Volumes of HydraSleeve Models.
Table 1. Standard HydraSleeve Dimensions, Sample Volume and Saturated
Screen Requirements*. Minimum Saturated Screen Required**
Minimum Saturated
Screen Required
Above each
Additional
HydraSleeve**
Item ID Sampler Type
Maximum
Sampler
Volume
Sampler
Dimensions
(Diameter When
Filled with
Sample)
Minimum
Well
Diameter
WITH
Top Weight in 2-
inch Diameter Sch
40 Well.
(FEET)
WITHOUT
Top Weight in 2-
inch Diameter Sch
40 Well.
(FEET)
2-inch Diameter Sch
40 Well
(FEET)
GSH110 HydraSleeve 600mL 1.5" Diameter x
30" Length
1.5" Sch 40
Wells 4.0 5.5 3.0
GSH130 HydraSleeve 1.1L 1.75" Diameter x
37" Length
2" Sch 80
Wells 5.0 6.5 3.5

GSH430 HydraSleeve
SuperSleeve 1.1L 1.75" Diameter x
37" Length
2" Sched 80;
(50mm)
Wells
5.0 7.0 3.5
GSH435 HydraSleeve
SuperSleeve 1.5L 1.75" Diameter x
52" Length
2" Sched 80;
(50mm)
Wells
7.0 9.5 5.0
GSH440 HydraSleeve
SuperSleeve 2.1L 1.75" Diameter x
66" Length
2" Sched 80;
(50mm)
Wells
8.5 12.0 6.5

GSH470
HDPE
HydraSleeve
SuperSleeve
(For PFAS
Sampling)
1.1L 1.75" Diameter x
37" Length
2" Sched 80;
(50mm)
Wells
5.0 7.5 4.0
GSH475
HDPE
HydraSleeve
SuperSleeve
(For PFAS
Sampling)
2.0L 1.75" Diameter x
67" Length
2" Sched 80;
(50mm)
Wells
9.0 12.5 7.0

GSH515 HydraSleeve
SpeedBag 500mL 1.5" Diameter x
30" Length
1.5" Sch 40
Wells
Do Not Use Top
Weight
6.5 with Oscillation
7.5 without
Oscillation
4.0 with Oscillation
5.0 without
Oscillation
GSH510 HydraSleeve
SpeedBag 900mL 1.75" Diameter x
37" Length
2" Sched 80;
(50mm)
Wells
Do Not Use Top
Weight
7.5 with Oscillation
9.0 without
Oscillation
4.5 with Oscillation
6.25 without
Oscillation

4-inch Diameter
Sch 40 Well.
(FEET)
4-inch Diameter
Sch 40 Well.
(FEET)
4-inch Diameter Sch
40 Well
(FEET)
GSH230 HydraSleeve 3L 2.9" Diameter x
37" Length
4" Sch 80
Wells 4.0 6.4 3.3

1.25-inch Diameter
Sch 40 Well.
Oscillation
Recommended
(FEET)
1.25-inch Diameter
Sch 40 Well.
Oscillation
Recommended
(FEET)
1.25-inch Diameter
Sch 40 Well.
Oscillation
Recommended
(FEET)
GSH405 HydraSleeve
SuperSleeve 300mL 0.9" Diameter x
48" Length
1" Sch 40
Wells 7.0 9.5 5.5
* Custom Length HydraSleeves, Custom "TurboSleeves" and "Armored HydraSleeves" are available for special applications.
** All Saturated Screen Lengths are approximate.

Standard Operating Procedure: Sampling Groundwater with the HydraSleeve (patents: 6,481,300; 6,837,120; 9,726,013)
Copyright 2023 EON Products 6

Sample Volume and Custom HydraSleeves
HydraSleeves can be custom-fabricated by EON in varying diameters and lengths to meet
specific volume requirements. HydraSleeves can also be deployed in series (i.e., multiple
HydraSleeves attached to one tether) to collect additional samples to meet specific volume
requirements, as described in “Multi Sampler Deployment”, page 16.
If you have questions regarding the availability of sufficient sample volume to satisfy laboratory
requirements for analysis, it is recommended that you contact the laboratory to discuss the minimum
volumes needed for each suite of analytes. Laboratories often require only 10% to 25% of the volume
they specify to complete analysis for specific suites of analytes, so they can often work with much
smaller sample volumes that can easily be acquired using HydraSleeves.

Information Required Before Deploying a HydraSleeve

Before installing a HydraSleeve in any well, you will need to know the following:

 The inside diameter of the well
 The total depth of the well
 The length of the well screen
 The position of the well screen in the well
 The water level in the well
 The sample volume required by the laboratory

The inside diameter of the well is used to determine the appropriate HydraSleeve diameter for use
in the well. The other information is used to determine the proper placement of the HydraSleeve
in the well to collect a representative sample from the screen (see “HydraSleeve Placement”,
below), and to determine the appropriate length of tether to attach to the HydraSleeve to deploy it
at the intended position in the well.

Most of this information (with the exception of the water level) should be available from the well
log; if not, it will have to be collected by some other means. The inside diameter of the well can be
measured at the top of the well casing, and the total depth of the well can be measured by sounding
the bottom of the well with a weighted tape. The position and length of the well screen may have
to be determined using a down-hole camera if a well log is not available. The water level in the
well can be measured using any commonly available water-level gauge.

Standard Operating Procedure: Sampling Groundwater with the HydraSleeve (patents: 6,481,300; 6,837,120; 9,726,013)
Copyright 2023 EON Products 7

Overview: HydraSleeve Operation & Placement

The HydraSleeve is first installed to a position below the intended sample interval. It is activated
by pulling upward at a rate of ~1 ft per second*, which causes water in the column to be captured
through the top opening and past the check-valve at the same rate the sampler is pulled upward.
As the HydraSleeve moves upward the sides of the sleeve are pulled around the stationary core of
water in the sample interval. The sample interval begins at the installed position of the top of the
HydraSleeve, upward for a distance approximately equal to the length of the HydraSleeve, when
correctly sized to the well diameter.

Operation

*~1 ft per second is about the speed that a person can quickly move their straightened arm in an arc from alongside
their leg to over their head. Some have also compared this to the motion used to “set the hook” when fishing.

1. HydraSleeve is installed
empty, on a suspension tether
below the sample interval in
the saturated screen.

2. Left in-place (still empty)
until the well restabilizes /
equilibrates.

3. To sample, pull upward
rapidly on the tether (~1-ft
per sec) to fill the
HydraSleeve

4. Valve at the top
automatically closes and
seals when HydraSleeve is
full. 1 & 2 3 4 4
Standard Operating Procedure: Sampling Groundwater with the HydraSleeve (patents: 6,481,300; 6,837,120; 9,726,013)
Copyright 2023 EON Products 8

HydraSleeve Placement
The HydraSleeve is designed to collect a sample directly from the saturated well screen. Since the
HydraSleeve is installed empty and flat, it displaces a negligible volume of water and remains
empty until activated.

In all cases, the installed position of the top of the HydraSleeves must be in the saturated screen
and the length of saturated screen above the HydraSleeve must be at least as long as the
HydraSleeve, preferably at least 6-inches longer. This should allow the sampler to fill before the
top of the device reaches the top of the saturated screen as it is pulled up through the water
column and ensures that only water from the screen is collected as the sample.

To optimize sample recovery in wells with short saturated screen length (5 feet or less), it is
recommended that the HydraSleeve be placed in the well so that the bottom weight rests on the
bottom of the well and the top of the HydraSleeve is as close to the bottom of the well screen as
necessary to leave at least one sampler length between the position of the top of the installed
sampler and the top of the saturated screen.

In short-screen wells, or wells with a short water column, it may be necessary to use a top-weight
on the HydraSleeve to compress the top of the sleeve toward the bottom of the well, leaving
sufficient saturated screen to fill the sleeve before it reaches the top of the screen (Figure 4). In
wells where multiple intervals are sampled (profiling) only the bottom HydraSleeve is compressed
by a top-weight.

Example Installations in 10-foot & 5-foot Long Screens

Example 1 (Fig 2): 2” ID SCH 40 PVC well, 50’ total depth, 10’ screen at the bottom of the well,
with water level above the screen (the entire screen contains water). Sampling will be done using,
 One Standard HydraSleeve for a 2-in well. (3-in flat width, 1.75-in filled OD, 38-in long,
1-L volume)
 One Standard Weight (1.5-in OD, 2-in long, 8oz).

Example 2 (Figs 3 & 3a): 2” ID SCH 40 PVC well, 50’ total depth, 5’ screen at the bottom of the
well, with water level above the screen (the entire screen contains water). Sampling will be done
using,
 One Standard HydraSleeve for a 2-in well. (3-in flat width, 1.75-in filled OD, 38-in long,
1-L volume)
 One Standard Weight (1.5-in OD, 2-in long, 8oz).
Standard Operating Procedure: Sampling Groundwater with the HydraSleeve (patents: 6,481,300; 6,837,120; 9,726,013)
Copyright 2023 EON Products 9

Example 2:
5-ft Saturated Screen
INCORRECT Placement (Fig 3)

If the saturated well screen in this example was
only 5’ long, and the 38-in long HydraSleeve
was placed with the weight resting on the bottom
of the well, the HydraSleeve would not fill
within the saturated screen and the sample would
include water from the casing above the screen,
which may not have the same chemistry.
The solution?
Deploy the HydraSleeve with a top weight.
See Figure 3a.

Figure 3. Incorrect placement of HydraSleeve.
Example 1:
10-ft Saturated Screen
Correct Placement (Fig 2)
Deploy the sampler so the weight rests at the
bottom of the well. The top of the sleeve is thus
set at ~40-in above the bottom of the well.

When the sampler is recovered, it will be pulled
upward approximately 38-in before it is filled
and the check-valve at the top closes, which is a
distance of approximately 78-in (6.5 feet) above
the bottom of the well, and far below the top of
the saturated screen.

In this example, only water flowing through the
screen is collected as a sample.

Figure 2. Correct placement of HydraSleeve

Sample
Interval
(~38 in
length)
HydraSleeve
length
= 38-inches

Bottom
Weight
Casing

Saturated
Screen
EMPTY
FULL
Figure 3. INCORRECT placement of HydraSleeve
Sample
Interval
(38-in
length)
FULL
EMPTY
Casing

Screen
HydraSleeve
length
= 38-inches

Bottom
Weight

Standard Operating Procedure: Sampling Groundwater with the HydraSleeve (patents: 6,481,300; 6,837,120; 9,726,013)
Copyright 2023 EON Products 10

These examples illustrate two of the many types of HydraSleeve placements. Multiple
HydraSleeve installations and more complex placements are discussed in a later section.

NOTE: Using smaller diameter HydraSleeves in larger diameter wells causes a slower fill rate.
(For example: 2-inch HydraSleeves in 4-inch wells) Special retrieval methods are necessary if
this is your set up. See “Oscillation”, Section IV, Item 4b. “HydraSleeve Recovery and Sample
Collection”.
Example 2: The Solution

5-ft Saturated Screen
Use a Top Weight (Fig 3a)

Deploy the HydraSleeve with a top weight, so
that the sleeve is collapsed to within 12-in of the
bottom of the well.

Starting at 12 inches from the bottom and
travelling another ~38-in upward to fill the
sleeve is a total of ~54 inches from the well
bottom (4.5ft), so it collects only water from the
screen as the sample.

Sample
Interval
(~38 in
length)
Casing

Stagnant
Water

Saturated
Screen
FULL
EMPTY

HydraSleeve
length
= 38-inches

Bottom
Weight
Figure 3a. Correct placement of HydraSleeve using
a Top Weight to Compress the HydraSleeve.
Sample
Interval
FULL
EMPTY Top Weight

Compressed
Sleeve
Casing

Screen

Standard Operating Procedure: Sampling Groundwater with the HydraSleeve (patents: 6,481,300; 6,837,120; 9,726,013)
Copyright 2023 EON Products 11

Field Procedures for Sampling with the HydraSleeve

Collecting a groundwater sample with a HydraSleeve is usually a simple one-person operation.

I. Assembling the Basic HydraSleeve*

1. Remove the HydraSleeve from its packaging, unfold it, and hold it by its top.

2. Crimp the white reinforcing strips at top of the HydraSleeve by folding the hard
polyethylene reinforcing strips toward each other so that the strips are creased in the
middle (at the holes) and the top of the HydraSleeve is open.

3. Attach the wide end of the spring clip to the holes from inside the HydraSleeve to
ensure that the top will remain open until the sampler is retrieved.

4. Attach the tether to the spring clip with zip-ties or by tying a knot in the tether.

5. Fold the flaps at the bottom of the HydraSleeve so the two holes align, then slide a
zip-tie or weight clip through the holes.

6. Attach a weight to the zip-tie or to the bottom of the weight clip to ensure that the
HydraSleeve will descend to the bottom of the well.
*See Super/SkinnySleeve assembly manual and HydraSleeve Field Manual for specific
instruction for these models.
Note: Alternatively, if spring clips are not being utilized, attach the tether to
one (NOT both) of the holes at the top of the HydraSleeve using a zip-tie from
the hole to the tether or by threading the tether through the hole and tying a
knot in the tether.
Note: Always wear clean protective gloves and safety glasses when handling and
discharging the HydraSleeve.
Note: Before deploying the HydraSleeve in the well, collect the depth-to-water
measurement that you will use to determine the preferred position of the HydraSleeve in
the well. This measurement may also be used with measurements from other wells to
create a groundwater contour map. If necessary, also measure the depth to the bottom of
the well to verify actual well depth to confirm your decision on placement of the
HydraSleeve in the water column.

Use a factory manufactured suspension tether or measure the correct amount of tether
needed to suspend the HydraSleeve in the well so that the weight will rest on the bottom of
the well (or at the preferred position in the well). Allow extra slack in the line if a Top
Weight is used and consider adding a few extra feet of tether at the top of the well to aid in
recovery of the sleeve.
Standard Operating Procedure: Sampling Groundwater with the HydraSleeve (patents: 6,481,300; 6,837,120; 9,726,013)
Copyright 2023 EON Products 12

II. Deploying the HydraSleeve
1. Using the tether, carefully lower the HydraSleeve to the bottom of the well, or to the
preferred depth in the water column.

During installation, hydrostatic pressure in the water column will keep the self-sealing
check valve at the top of the HydraSleeve closed, and ensure that it retains its flat, empty
profile for an indefinite period prior to recovery.

2. Secure the tether at the top of the well by attaching it to a ring, tab, or hook on the bottom of
the well cap . If the weight is resting on the well bottom, leave a few inches of slack in the
line to avoid pulling the sampler up as the cap is removed at the next sampling
event.

III. Allowing the Well to Equilibrate

The installed HydraSleeve should be left undisturbed for some time before sampling to allow
the well to return to its pre-installation flow conditions. This “equilibration time” ensures that
flow dynamics and contaminant distribution restabilize to natural flow conditions to
represent the aquifer conditions after vertical mixing occurs which may be caused by
installation of a sampling device in the well.
 Situation: The HydraSleeve is deployed for the first time in a well or for only one
sampling event.
The basic HydraSleeve is very thin in cross section and displaces very little water (<100
ml) during deployment so, unlike most other sampling devices, it does not disturb the
water column to the point where long equilibration times are necessary to ensure recovery
of a representative sample.
When the SpeedBag version of the HydraSleeve is used, it can be recovered immediately,
or within a few hours with no equilibration time. In regulatory jurisdictions that impose
specific requirements for equilibration times prior to recovery of no-purge sampling
devices, the regulatory requirements should be followed.

 Situation: The HydraSleeve is being deployed for ongoing monitoring or for recovery
during a future sampling event.
In periodic (i.e., quarterly, semi-annual, or annual) sampling programs, the sampler
for the current sampling event can be recovered and a new sampler (for the next
sampling event) deployed immediately thereafter, so the new sampler remains in the
well until the next sampling event.
Note: Make sure that the HydraSleeve is not pulled upward at any time during its descent. If
the HydraSleeve is pulled upward at a rate greater than 0.5 ft per second at any time prior to
recovery, the top check valve will open and some water from the interval where the sampler
was pulled upward will enter the HydraSleeve prematurely.
Note: If using top weights, additional equilibration time is needed to allow the top
weight time to compress the HydraSleeve into the bottom of the well. Allow up to 24
hours in a 2-inch well and less in a 4-inch well.
Standard Operating Procedure: Sampling Groundwater with the HydraSleeve (patents: 6,481,300; 6,837,120; 9,726,013)
Copyright 2023 EON Products 13

Thus, a long equilibration time is ensured and at the next sampling event the sampler
can be recovered immediately. This eliminates the need for separate mobilizations to
deploy and then to recover. HydraSleeves can be left in a well indefinitely and will
represent the aquifer conditions at the time the sampler is pulled upward and recovered.

IV. HydraSleeve Recovery and Sample Collection
1. Slowly remove the well cap a few inches to provide access for a water level measurement.
2. Secure the tether at the top of the well while maintaining tension on the tether (but
without pulling the tether upwards)
3. Measure the water level in the well.
4. Use one of the following 3 retrieval methods. In all 3 scenarios, when the HydraSleeve is full,
the top check valve will close. You should begin to feel the weight of the HydraSleeve on
the tether as it is raised out of the water. The closed check valve prevents loss of sample
and entry of water from zones above the well screen as the HydraSleeve is recovered.

5. Once the sampler is out of the sample interval it is not necessary to pull rapidly. Pull the
tether upward until the HydraSleeve is at the top of the well.

6. Discard the small volume of water trapped above the HydraSleeve check valve by
pinching the across the top of the HydraSleeve under the stiffeners (above the check
valve) and letting the water spill out.
c. Speedbag: SpeedBags require check valve activation and oscillation during
recovery: When retrieving the SpeedBag, pull up hard 1-2 feet (about half the length of
the sampler) to open the check valve; let the assembly drop back down to the starting
point; REPEAT THIS PROCESS 4 TIMES; and then quickly recover the SpeedBag
through the well screen to the surface.
b. Oscillation: When the length of available sample interval is very close to the length of
the sampler or when a smaller diameter HydraSleeve is used in a larger well it may be
recommended that the HydraSleeve is oscillated in the screen zone to ensure it is full before
leaving the screen area. Pull up rapidly 1-3 feet (about half the sampler length), let the
sleeve assembly drop back down, and repeat 3-5 times before pulling the sleeve to the
surface. The collection zone will be the oscillation zone. When in doubt use this retrieval
method.
a. Single Pull: In one smooth motion, rapidly pull the tether up a distance of at least
the length of the sampler (30”to 60”) at a rate of about 1-foot per second (or faster).
This is about the speed one can quickly raise a straightened arm in an arc from their
side to above their head. The motion will open the top check valve and allow the
HydraSleeve to fill in a distance approximately equal to the length of the HydraSleeve
if the sleeve is sized to fit the well.
Copyright 2023 EON Products 14

Standard Operating Procedure: Sampling Groundwater with the HydraSleeve (patents: 6,481,300; 6,837,120; 9,726,013)

V. Sample Discharge

1. Remove the discharge tube from the packaging. *If the HydraSleeves were installed at a previous
sampling event the tubes may have been stored separately until the recovery date.
2. Hold the HydraSleeve at the check valve.

3. Use the pointed end of the discharge tube to puncture the HydraSleeve at least 3-4 inches below
the reinforcement strips. NOTE: For some contaminants (VOC's/sinkers) the best location for
discharge is the middle to bottom of the sampler. This would be representative of the deeper
portion of the well screen.

4. Discharge water from the HydraSleeve into the sample containers. Control the discharge
from the HydraSleeve by either raising the bottom of the sleeve, by squeezing it like a tube
of toothpaste, and/or manipulating the discharge tube.

5. Continue filling sample containers until all are full.

VI. Measurement of Field Indicator Parameters
Field indicator parameter measurement is generally done during well purging and or low-flow
sampling to confirm when parameters are stable, and sampling can begin. Because no-purge
sampling does not require purging, field indicator parameter measurement is not necessary for the
purpose of confirming when purging is complete.

If field indicator parameter measurement is required to meet a specific non-purging regulatory
requirement, it can be done by taking measurements from water within a HydraSleeve after the lab
sample has been collected. Alternatively, a second HydraSleeve may be installed in conjunction
with the primary sample collection HydraSleeve [see Multiple Sampler Deployment below]).

Note: A lightweight portable tripod may be helpful to hold the HydraSleeve during single-person
sampling. (Contact EON)
Be sure you have discarded the water above the check valve – see step #6 above.
Note: Sample collection should be done immediately after the HydraSleeve has been
brought to the surface to preserve sample integrity.
Copyright 2023 EON Products 15

Standard Operating Procedure: Sampling Groundwater with the HydraSleeve (patents: 6,481,300; 6,837,120; 9,726,013)

VII. Alternate Deployment Strategies

Deployment in Wells with Limited (Short) Water Columns

For wells in which only a limited water column needs to be sampled, the HydraSleeve can be
deployed with an optional top weight in addition to a bottom weight. The top weight will
collapse/compress the HydraSleeve to a very short (approximately 6” to 24”) length at the bottom
of the well. This allows the HydraSleeve to fill in a water column that is only 3’ to 10’ in height,
depending on the sampler size. Note: SuperSleeves can be manufactured in longer lengths to
provide greater sample volume and can also be Top Weighted.

Multiple Sampler Deployment

Multiple sampler deployment in a single well screen can accomplish two purposes:
1. It can collect additional sample volume to satisfy site or laboratory-specific sample
volume requirements.
2. It can be used to collect samples from multiple intervals in the screen to allow
identification of possible contaminant stratification.

Figure 4. Multiple HydraSleeve deployment

Figure 4
Spring Clip
Cable Tie
Spring Clip
Cable Tie
Spring Clip
Bottom Weight
NOTES:
 Be sure the top HydraSleeve has a saturated screen length of at least the length of the
sampler (plus at least 6 inches is preferred) above the top of the HydraSleeve initial position
to ensure complete filling within the screen.
 Contact EON for custom suspension tethers for multiple HydraSleeves and for sampler
spacing guidance.

Copyright 2023 EON Products 16

Standard Operating Procedure: Sampling Groundwater with the HydraSleeve (patents: 6,481,300; 6,837,120; 9,726,013)

Optional: 2-Sampler Deployment

If there is a need for only 2 samplers, they can be installed as shown in figure 4 or as follows. The first sampler
can be attached to the tether as described above, a second attached to the bottom of the first using your desired
length of tether between the two and the weight attached to the bottom of the second sampler (figure 5). This
method can only be used with 2 samplers; 3 or more HydraSleeves in tandem need to be attached as described in
“Multi-Sampler Deployment” above.

Figure 5. Alternative method for deploying two HydraSleeves.

In either case, when attaching multiple HydraSleeves in series, more weight will be required to
hold the samplers in place in the well than would be required with a single sampler. Recovery of
multiple samplers and collection of samples is done in the same manner as for single sampler
deployments.

Optional Configurations for Bottom HydraSleeves in Multi-Sampler Installations:
In installations having multiple HydraSleeves, the bottom HydraSleeve can be attached to hang from the bottom of
the suspension tether, in which case the Bottom Weight is attached to the bottom HydraSleeve. This is the
preferred method, especially if the bottom HydraSleeve is compressed using a Top Weight.

Alternatively, the bottom HydraSleeve can be installed alongside the tether so that a length of tether hangs down
below the bottom HydraSleeve. In this case, the Bottom Weight is attached to the bottom of the suspension tether
and a Top Weight isn’t recommended.

Spring Clip
Tether
Spring Clip
Bottom Weight
Copyright 2023 EON Products 17
Standard Operating Procedure: Sampling Groundwater with the HydraSleeve (patents: 6,481,300; 6,837,120; 9,726,013)

Post-Sampling Activities

The recovered HydraSleeve and the sample discharge tubing should be disposed as per the solid
waste management plan for the site.
To prepare for the next sampling event, a new HydraSleeve can be deployed in the well (as
described previously) and left in the well until the next sampling event, at which time it can be
recovered. The weight and weight clip can be reused on this sampler after cleaning as needed per
the site equipment decontamination plan.

The tether may be dedicated to the well and reused or discarded at the discretion of sampling
personnel.

EON Products, Inc.
Email : [e-mail]
Phone : [phone]
Website : www.HydraSleeve.com & www.EONPro.com

Questions & Assistance
Copyright 2023 EON Products 18
Standard Operating Procedure: Sampling Groundwater with the HydraSleeve (patents: 6,481,300; 6,837,120; 9,726,013)
References

McAlary, T. A. and J. F. Barker, 1987, Volatilization Losses of Organics During groundwater
Sampling From Low-Permeability Materials, Groundwater Monitoring Review, Vol. 7, No. 4,
pp. 63-68

Parsons, 2005, Results Report for the Demonstration of No-Purge groundwater Sampling
Devices at Former McClellan Air Force Base, California; Contract F44650-99-D-0005,
Delivery Order DKO1, U.S. Army Corps of Engineers (Omaha District), U.S. Air Force Center
for Environmental Excellence, and U.S. Air Force Real Property Agency

Robin, M. J. L. and R. W. Gillham, 1987, Field Evaluation of Well Purging Procedures,
groundwater Monitoring Review, Vol. 7, No. 4, pp. 85-93

QUESTAR GAS COMPANY

SALT LAKE NORTH OPERATIONS FACILITY

Operation and Maintenance Manual

Prepared by

October 2023

Revised March 2023
March 2024 Page i

TABLE OF CONTENTS
TABLE OF CONTENTS .......................................................................................................... i
ACRONYMS AND ABBREVIATIONS.................................................................................. ii
1.0 BACKGROUND ............................................................................................................ 1
2.0 ANNUAL SLURRY WALL INSPECTION .................................................................... 1
3.0 ANNUAL SURFACE CAP INSPECTION ...................................................................... 2
4.0 ANNUAL GROUNDWATER MONITORING ............................................................... 2
4.1 Purpose of Groundwater Sampling ................................................................... 2
4.2 Groundwater Monitoring Program.................................................................... 3
4.3 Well and Piezometer Rehabilitation.................................................................. 4
4.4 Static Water Level Equipment and Measurement Procedure ................................. 4
4.5 Groundwater Sampling Equipment ................................................................... 4
4.6 Low Stress Peristaltic Pump ............................................................................ 5 4.7 Hydrasleeve.................................................................................................. 5
4.8 Equipment Calibration ................................................................................... 6
4.9 QA/QC Sample ............................................................................................. 6
4.10 Groundwater Monitoring Documentation Procedures .......................................... 6
4.11 Sample Identification and Labeling .................................................................. 7 4.12 Chain-Of -Custody Procedures ......................................................................... 7
4.13 Sample Shipping ........................................................................................... 8
4.14 Decontamination Procedures ........................................................................... 8
4.15 Investigation-Derived Waste ........................................................................... 9
4.16 Screening Criteria .......................................................................................... 9
5.0 REPORTING.................................................................................................................. 9
6.0 HEALTH AND SAFETY ............................................................................................... 9
7.0 REFERENCES ............................................................................................................. 10

TABLES
Table 1 Monitoring Well Location s
Table 2 Groundwater Level Locations
Table 3 Screening Criteria

FIGURES
Figure 1 Location Map
Figure 2 Site Map
Figure 3 Slurry Wall and Surface Cap Location
Figure 4 Proposed Sampling Wells and Piezometers

APPENDICES
Appendix A – Field Forms
Appendix B – Hydrasleeve Sampling Procedure

Operation and Maintenance Manual
Questar Gas Company
March 2024 Page ii
ACRONYMS AND ABBREVIATIONS

bgs below ground surface
CGR coal gasification residuals
COC chain-of -custody
IDW investigation -derived waste
MCL maximum contaminant levels
mg/L milligrams per liter
O&M Operations and Maintenance
ORP oxidation reduction potential
pH potential of hydrogen
QA/QC Quality Assurance / Quality Control
QGC Questar Gas Company
RAP Remedial Action Plan
SVOC semi-volatile organic compound
UDEQ Utah Department of Environmental Quality
USEPA United States Environmental Protection Agency
VOC volatile organic compound

Operation and Maintenance Manual
Questar Gas Company
March 2024 Page 1
1.0 BACKGROUND
This revised Operation and Maintenance Manual (O&M) Manual is a supplement to the Revised
Remedial Action Plan (RAP) (AECOM, 2023) for the Questar Gas Company (QGC), Salt Lake
Operations Center, and replaces the 1989 Operations and Maintenance Manual (Dames and
Moore, 1989). The remedy outlined in the RAP consists of hydraulic containment without
groundwater extraction. The remedy will be implemented via assessment of the existing slurry
wall, inspection and maintenance of a surface cap, and groundwater monitoring.

Questar Gas Company’s Salt Lake Operations Center is located at 1140 West 200 South in Salt
Lake City, Utah (Figure 1 ). The former Utah Gas & Coke Company property which produced
synthetic gas by coal gasification between 1908 and 1929 (Dames & Moore, 1988) was located in
the northeast portion of the Operations Center and is referred to as the North Operations Facility
(the site) in the historical documents related to this project.

The function of the slurry wall is to isolate the coal gasification residuals (CGR) source area within
the slurry wall and prevent CGR in the shallow aquifer from migrating off -Site . The total length
of the slurry wall is approximately 2,400 feet. The slurry wall is keyed into the clay layer typically
encountered at a depth of approximately 18-23 feet below ground surface (bgs). The slurry wall
extends into the underlying clay layer a minimum depth of three feet and has a minimum width of
approximately two feet (Dames and Moore, 1988). The location of the perimeter slurry wall and
monitoring wells and piezometers are shown on Figure 2 .

The area within the slurry wall is typically utilized for parking, either paved with asphalt or
concrete, or covered with buildings, with the exception of some small, landscaped areas in the
southern part of the site along 100 South Street. Th is developed area serves as a low permeability
cap (surface cap) to minimize surface water infiltration , which can reduce mobility of the CGR
source beneath the Site. The locations of the perimeter slurry wall and surface cap are shown on
Figure 3 .

2.0 ANNUAL SLURRY WALL INSPECTION
Assessment of the slurry wall will take place annually and will consist of a visual inspection and
assessment of hydraulic gradients.

The field inspector will walk the perimeter of the slurry wall (see Figure 3 ) and visually inspect
for potential issues such as the items listed below. An example annual inspection form is provided
in Appendix A .

• Subsurface subsidence or ponding of water near or over the slurry wall,
• New deep-rooted plants within 15 feet of the slurry wall,
• Land disturbance over the slurry wall (i.e., excavations or new construction), and
• Animal burrows within 15 feet of the slurry wall, other than mice and other small rodents.

Onsite activities with the potential to impact the slurry wall will be monitored throughout the year.
For example, directional drilling will not be allowed within 25 feet of the slurry wall without
Operation and Maintenance Manual
Questar Gas Company
March 2024 Page 2
additional evaluation . Loading of the surface directly over the slurry wall will be avoided to the
extent possible (i.e., large soil piles). In addition, to the extent possible, new deep-rooted
vegetations (trees) will not be planted within 15 feet of the slurry wall.

Hydraulic gradients will be assessed as part of the annual slurry wall inspection event. The
assessment will include calculation of hydraulic gradients 1) upgradient f ro m the site, 2) within
the slurry wall area, 3) down gradient of the site, and 4) across the paired slurry wall piezometers.
The calculated gradients are expected to be an order of magnitude different from the pre slurry
wall gradient of 0.003 to 0.004 feet per foot (Dames and Moore, 1988). The associated
potentiometric surface maps will present groundwater flow directions for each area as listed above.
Groundwater measurement procedures are described in Section 4.4 .

3.0 ANNUAL SURFACE CAP INSPECTION
The surface cap (parking areas, roads, building footprint, see Figure 3 ) will be inspected on an
annual basis and the parking lot area will be inspected for excessive cracking. If excessive cracking
is identified, the area will be evaluated and repaired as necessary to prevent infiltration to the
subsurface within the slurry wall area. The contribution of small unpaved areas (i.e., landscaping)
to subsurface infiltration is anticipated to be insignificant, and as such, these areas will be left
undisturbed. Consistent with current operations, any future construction, excavation, or subsurface
installations will continue to be limited by QGC such that they do not interfere with the
functionality of the surface cap. Inspections records will be maintained onsite. An example annual
inspection form is provided in Appendix A .

The stormwater system will also be visually inspected annually to verify that stormwater is being
collected and conveyed outside of the slurry wall area. Areas to inspect include rain gutters, the
concrete gutter system, and stormwater collections boxes within the slurry wall.

4.0 ANNUAL GROUNDWATER MONITORING
The annual groundwater monitoring program presented in this O&M Manual is based on 30 plus
years of semi-annual sampling events between 1992 and 2023, which demonstrate that
groundwater impacts beneath the site are well understood, delineated, and are not migrating. The
monitoring described herein is based on the recommendations presented in the Soil Gas and
Groundwater Investigation Summary Report (AECOM, 2022) and approved by the Utah
Department of Environmental Quality (UDEQ) on January 5, 2023 (UDEQ, 2023).

4.1 Purpose of Groundwater Sampling
Groundwater sampling will be performed at the site to confirm ongoing plume stability (i.e., plume
is not migrating) and natural attenuation (i.e., contaminant mass is decreasing) of the groundwater
plume. Six monitoring wells will be sampled on an annual basis. Three of the wells are located
within the groundwater plume (source wells) and will monitor natural attenuation of the plume.
Three of the monitoring wells are downgradient of the plume (sentry wells) and will verify that
plume migration is not occurring.

Operation and Maintenance Manual
Questar Gas Company
March 2024 Page 3
4.2 Groundwater Monitoring Program
Groundwater will be monitored annually during the fall of each calendar year. The next sampling
event will take place in Fall 2024. Samples will be collected from six monitoring wells as listed in
Table 1 below. Sample s will be analyzed for volatile organic compounds (VOCs) by United States
Environmental Protection Agency (USEPA ) analytical method SW-846 8260B. Samples will also
be analyzed for semi-volatile organic compounds (SVOCs) by EPA Method 8070C for a period
of eight sampling events. Discontinuation of SVOC analyses will be evaluated and discussed with
UDEQ if detections remain below MCLs after eight sampling events

Table 1
Monitoring Well Locations

Well ID Status Well Type
MW-101 Proposed New Well Source Area Well MW-102
SW-1 Existing Well
MW-103 Proposed New Well
Sentry Well MW-12 Existing Well M-10

The groundwater monitoring network will be assessed annually to confirm that groundwater
impacts have not migrated past sentry wells, and recommendations will be presented in the annual
report if deficiencies are identified . If sampling results indicate migration of an existing plume is
occurring, or a potential new release has occurred, it will be documented in the report and an
appropriate response will be discussed with UDEQ. Additional details regarding groundwater
sampling methods and procedures are provided in Section 4.4 through Section 4.1 5 .

If at any time a well that is currently part of the monitoring program is found to be unusable, it
will be evaluated to see if it can be repaired prior to the next sampling event. If it is determined
that the well cannot be repaired, the well will be replaced, or a substitute well will be selected and
UDEQ will be contacted for approval.

During the annual groundwater monitoring event, depth to groundwater will be measured at 6
wells and 9 piezometers. Locations are shown on Figure 4 and are listed in Table 2 below. Depth
to groundwater measurements will be used to calculate groundwater elevations and p otentiometric
surface maps will be generated for the areas upgradient of the site, inside the slurry wall, and
downgradient of the site. Further details regarding the water level measurement procedures are
provided in Section 4.4 .

Operation and Maintenance Manual
Questar Gas Company
March 2024 Page 4
Table 2
Groundwater Level Locations

Well ID Status Well Type
MW-101 Proposed New Well Source Area Well
(Sample and Water Level) MW-102
SW-1 Existing Well
MW-103 Proposed New Well Sentry Well
(Sample and Water Level) MW-12 Existing Well M-10
PZ-1
Proposed New Piezometer
Piezometer
(Water Level)
PZ-2
PZ-3
SWP-1
Existing Wall Piezometer
SWP-2
SWP-3
SWP-4
SWP-5
SWP-6
4.3 Well and Piezometer Rehabilitation
Monitoring wells and piezometers listed in Table 2 should be redeveloped on a as needed basis
and the surface completions inspected annually. Damaged well completions will be replaced as
needed. Wells and piezometers will be redeveloped using a submersible pump, bailer, or foot valve
pump. Purge water from well development will be containerized and properly disposed of as
Investigation -Derived Waste according to Section 4.1 5 . An example well development form is
included in Appendix A .

4.4 Static Water Level Equipment and Measurement Procedure
The water level in all wells as noted in Table 2 will be measured before any wells are purged or
Hydrasleeves are deployed. Depth to groundwater will be measured with an electronic dual
interface probe or water level meter, and the measurement will be recorded on the Static Water
Level Log form (Appendix A ). The water level indicator will be lowered into the well until a
change in conductivity indicates that groundwater has been encountered. The depth to water will
be measured from the reference point at the top of the well casing. If the reference point cannot be
located, the depth will be measured from the north side of the casing. All measurements will be
made to +0.01 foot. Field measurements will be used in conjunction with the surveyed elevations
of the top of each well or piezometer casing to determine the groundwater surface elevation (above
mean sea level).

4.5 Groundwater Sampling Equipment
Monitoring wells will be sampled with a peristaltic pump via low stress purging or using a
Hydrasleeve (or similar device s).

Operation and Maintenance Manual
Questar Gas Company
March 2024 Page 5
4.6 Low Stress Peristaltic Pump
Wherever possible, monitoring wells will be purged and sampled using “low-stress” techniques.
Each monitoring well will be purged and sampled at a rate less than or equal to 0.3 liters per minute
until field -measured parameters stabilize to ensure groundwater is representative of the aquifer
before samples are collected. At a minimum, the parameters of potential of hydrogen (pH),
conductivity, oxidation reduction potential (ORP), and temperature will be monitored during
purging using portable calibrated meters. Parameters will be measured every three minutes during
purging.

At least two consecutive field measurements made three minutes apart shall fall within the ranges
stated below before well purging will be considered complete:

• pH = ±0.2 units,
• temperature = ±1 degree Centigrade (ºC),
• conductivity = ±10 percent, and
• ORP = ±10 percent.

With the exception of low-yield monitoring wells, groundwater samples will be collected
immediately after field -measured parameters have stabilized. Groundwater samples will be
collected in appropriate sample containers supplied by the analytical laboratory. New or dedicated
pump tubing will be used at each monitoring well. Groundwater samples will be placed in the
appropriate sample containers. Sa mples requiring cooling will be stored in an ice-chilled cooler.

Depth to groundwater will be measured every three minutes during purging and drawdown will be
limited to one foot. The pumping rate will be reduced if drawdown is greater than one foot. If
drawdown cannot be limited to one foot, then the well will be purged dry and allowed to recover
to 75 percent prior to sample collection. A groundwater sampling form will be completed at each
sampling location at the time of sampling. The groundwater sampling form is included in
Appendix A .

4.7 Hydrasleeve
Monitoring wells with a water column of 5 feet or greater (and free of CGR) can be sampled using
a passive no purge (grab) sampling device such as a Hydrasleeve. Groundwater quality parameters
(e.g., pH, conductivity, temperature, and oxidation-reduction potential [ORP]) will not be
measured in the field due to limited groundwater volume recovered. The collection of the
groundwater sample using a Hydrasleeve causes only minimal disturbance of the water column
and retrieval of the device causes no significant drawdown in the well until the sample is
withdrawn from the well. Hydrasleeve samplers must be deployed and redrawn from the screen
interval only. Sample s collected from above the screened interval should be discarded. Passive
(no -purge) sampling devices like the Hydrasleeve are designed to collect formation -quality water,
under undisturbed (non-pumping) natural flow conditions. Samples collected using a Hydrasleeve
generally provide a good quality sample and are similar to samples collected using low-flow
purging and sampling methods. A groundwater sample form will be completed at each sampling
location at the time of sampling (Appendix A). A Hydrasleeve sampling procedure is provided in
Appendix B.
Operation and Maintenance Manual
Questar Gas Company
March 2024 Page 6

4.8 Equipment Calibration
Routine maintenance and calibration of equipment (e.g. water level meter, water quality meter)
will be followed in accordance with manufacturer guidance. Equipment will be inspected and
calibrated at the start of each field day, as applicable. Instrument calibration will be checked if
unexpected or unexplained readings are obtained, and the instrument will be re-calibrated, if
necessary. Calibration details will be recorded on a separate equipment calibration log and
provided with the field documentation (Appendix A ).

4.9 QA/QC Sample
Quality Assurance/Quality Control (QA/QC) samples to be collected include one field duplicate
and a trip blank collected for each cooler containing samples for VOC analysis. Data validation
will not be performed for routine monitoring.

4.10 Groundwater Monitoring Documentation Procedures
All data generated during monitoring will be entered directly into the appropriate sampling log
forms using permanent, indelible ink. Photographs also may be taken to document field activities.

Typical field log form entries may include the following:

• Location, description, and photographs, if applicable of the sampling point,
• Details of the sampling site (e.g., the elevation of the casing, casing diameter and depth,
integrity of the casing),
• Documentation of procedures for preparation of reagents or supplies which become an
integral part of the sample (e.g., filters and absorbing reagents),
• Documentation of calibration procedures for field instruments,
• Identification of sampling crew members,
• Matrix of sample (e.g., groundwater),
• Number and volume of sample taken,
• Sampling methodology,
• Sample preservation,
• Date and time of collection,
• Collector's sample identification number(s),
• Sample distribution and transportation method,
• References such as maps of the sampling site,
• Field observations,
• Any field measurements made (e.g., pH, temperature, conductivity, and water depth),
• Decontamination procedures, and
• Signature and date by the personnel responsible for observations.

Activity -specific field forms must be completed during field sampling activities. Examples of these
types of forms are presented in Appendix A:

Operation and Maintenance Manual
Questar Gas Company
March 2024 Page 7
• Static Water Level Log,
• Groundwater Sampling Form ,
• Well Development Form
• Equipment Calibration Log, and
• Chain -of-custody (COC) Record.

4.11 Sample Identification and Labeling
Groundwater samples will be labeled in accordance with Questar Gas Company guidance. Sample
IDs will also be recorded in the sampling log.

All sample containers will be labeled at the time of sample collection . Labels will be completed
legibly with permanent ink . The following information will be recorded on the sample label:

• Sample designation,
• Date and time of collection,
• Name or initials of sampler,
• Analysis requested, and
• Preservative.

4.12 Chain-Of-Custody Procedures
The possession and handling of all environmental samples will be traceable from the time of
collection, through analysis, until final disposition . Documentation of the sample history is referred
to as the COC. Required components of the COC program include:

• Sample designation,
• Date and time of collection,
• Matrix type,
• Number of containers,
• Analyses requested,
• Remarks section to relay potential hazards or other information to the laboratory,
• Name and signature of collector,
• Signature of persons involved in the chain of possession,
• Date and time of each change of custody,
• Internal temperature of container when opened at the laboratory, and
• Condition of samples when received by laboratory.

A COC record will be completed and will accompany every sample shipment. In addition, a sample
or shipping container is considered in a person's custody if it is:

• In a person's physical possession,
Operation and Maintenance Manual
Questar Gas Company
March 2024 Page 8
• In view of the person after he or she has taken possession,
• Secured by the person so that no one can tamper with it, or
• Stored in a secured area.

To the extent possible, custody seals should be attached to all shipping containers before the
samples leave the custody of sampling personnel. Samples arriving at the laboratory with missing
or broken seals will not be rejected. Signed and dated seals will be attached so that they must be
broken in order to open shipping containers.

4.13 Sample Shipping
Samples will be packaged and delivered or shipped by the sampler within the applicable hold time
to a Utah Certified Laboratory. Groundwater samples will be placed on ice in an insulated cooler
for shipment and cooled to the required temperature of ≤6 °C as quickly as possible.

Sampling personnel will deliver samples to local laboratories or will deliver samples to a shipping
carrier for overnight delivery to non-local laboratories. If the samples are shipped via an overnight
carrier, the following procedure will be used for packaging:

• In sert cushioning material in the bottom of the cooler,
• Line the cooler with a large plastic bag,
• Seal each sample container in a resealable plastic bag and place upright in the cooler,
• Place wet ice and additional packaging materials around the containers,
• Include a temperature blank in each cooler,
• Place pertinent paperwork such as the COC form in a resealable plastic bag and tape to
the inside lid of the cooler,
• Attach signed custody seal to the cooler in two places and cover with clear tape in such a
way that the custody seal must be broken to open the cooler,
• Seal the cooler with packaging tape, and
• Affix a shipping label to the outside of the cooler.

4.14 Decontamination Procedures
All dedicated, non-dedicated, and/or non-disposable sampling equipment will be thoroughly
decontaminated before each use, between each location, and at the completion of the sampling
program. The following procedures will be used:

• Clean equipment thoroughly in non-phosphate detergent solution using brushes as
necessary,
• Rinse thoroughly with tap water,
• Rinse thoroughly with deionized or distilled water, and
• Allow equipment to air dry.

Between use, equipment will be stored in plastic bags or dedicated cases to prevent contamination
from dust or soil. All downhole equipment used for sampling monitoring wells or measuring water
levels will be thoroughly cleaned to remove any visible soil, sediment, or residue prior to use at
Operation and Maintenance Manual
Questar Gas Company
March 2024 Page 9
each location. Equipment will be decontaminated before each use by washing with a non-
phosphate detergent solution and triple rinsing with deionized or distilled water. New or dedicated
sampling tubing will be used at each sample location.

4.15 Investigation-Derived Waste
Investigation -Derived Waste (IDW) will consist of water used to decontaminate sampling
equipment, purge water from monitoring well sampling, and solids such as used tubing and
personal protective equipment. IDW will be containerized , characterized, and properly disposed
of. Other wastes such as packaging materials, and general refuse will be disposed of in an onsite
municipal waste dumpster.

4.16 Screening Criteria
Groundwater analytical data will be screened against USEPA maximum contaminant levels
(MCLs) (USEPA, 2023) as shown in Table 3 below.

Table 3
Screening Criteria

Analyte MCL
(mg/L)
Benzene 0.005
Toluene 1.0
Ethylbenzene 0.70
Total Xylene 10
Naphthalene MCL Not Established
mg/L – milligrams per liter
5.0 REPORTING
An annual monitoring report will be prepared and submitted to UDEQ after completion of the
groundwater monitoring event. The report will summarize field activities, observed field
anomalies, analytical results, and include conclusions or recommendations. The report will also
include site figures, summary tables, and copies of field forms, and laboratory analytical reports.

6.0 HEALTH AND SAFETY
Prior to undertaking any environmental activities at the site, the site-specific Environmental,
Health, Safety and Site Management Plan will be reviewed and followed (Dominion, 2017). In
addition to this plan, all contractors to Questar Gas Company will review the Contractors Health
and Hazard Advisory outlin ing health and safety precautions for the site. The Environmental,
Health, Safety and Site Management Plan includes notice requirements to construction,
underground utility, and environmental workers who could be exposed to subsurface soil and
groundwater conditions beneath the site so they are informed of potential dangers and can take
appropriate safety measures to address potential health risks associated with environmental
conditions.

Operation and Maintenance Manual
Questar Gas Company
March 2024 Page 10
7.0 REFERENCES
AECOM, 2023. Questar Gas Company, Salt Lake North Operations Facility, Revised Remedial Action
Plan. August 2023.
UDEQ, 2023. Re: Soil Gas and Groundwater Investigation Report, Questar Gas Company, Salt Lake North
Operations Center December 2022. January 5, 2023.
USEPA. 2023. Drinking Water Contaminants and Maximum Contaminant Levels (MCLs)
https://www.epa.gov/risk/regional-screening-levels-rsls-generic-tables.
AECOM, 2022. Dominion Energy Services Inc., Soil Gas and Groundwater Investigation Summary Report
December 2022.
Dominion, 2017. Dominion Questar Gas Company Environmental, Health, Safety & Site Management Plan
North Operations Center Salt Lake City, Utah. May, 2017.
Dames and Moore, 1989. Operations and Maintenance Manual, Ground Water Extraction. Revision,
February 10, 1989.
Dames and Moore, 1988. Site Investigation and Proposed Remedial Action Plan. August 9, 1988.
Dames and Moore, 1986. Mountain Fuels Supply Company Operations Center Remedial Action Strategy
(RAS). April 10, 1986.

Revised Remedial Action Plan
Questar Gas Company
March 2024

FIGURES
S
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W
W 200 S
W 100 S
I 80 W
Euclid Ave
Folsom Ave
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Figure 3
Slurry Wall and
Surface Cap Location
Dominion Energy
0 240
1 INCH = 120 FEET
Project Area
Imagery: Nearmap 2023
Note: Historical Locations from Site Investigation and
Proposed Remedial Action Plan
August 9,1999 (Dames & Moore 1998 b)
Approximate Location of Surface Cap
Approximate Location of Slurry Wall
Utah Gas and Coke Company Site
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W 200 S
W 100 S
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Figure 4
Proposed Sampling
Wells and Piezometers
Dominion Energy
Note: Red Symbol Locations are Proposed
Historical Locations from Site Investigation and
Proposed Remedial Action Plan
August 9,1999 (Dames & Moore 1998 b)
Approximate Location of Slurry Wall
Utah Gas and Coke Company Site
Potential area with CGR and groundwater impacts (Kleinfleder, 2020)
Piezometers (water level only)
Monitoring well (water level and sample collection)
Imagery: Nearmap 2023
0 240
1 INCH = 120 FEET
Project Area
Revised Remedial Action Plan
Questar Gas Company
March 2024

APPENDIX A

Example Field Sampling Forms
• Slurry Wall Inspection Form
• Surface Cap Inspection Form
• Well Development Form
• Daily Field Record
• Groundwater Sampling Form
• Static Water Level Log
• Equipment Calibration Log
• COC Record

SLURRY WALL INSPECTION FORM
DOMINION ENERGY – SALT LAKE NORTH OPERATIONS FACILITY

Page 1 of 1
Date of Inspection: Weather Conditions: Inspector's Name/Title:
Item Yes/No Comments/Locations Repair Action Taken Date Repairs
Complete
1. Evidence of subsurface
subsidence or ponding of
water near or over the slurry
wall?

2. Any deep-rooted
vegetation within 15 feet of
the slurry wall (i.e. trees or
shrubs)?

3. Any evidence of land
disturbing activities observed
within 25 feet of wall (i.e.
drilling, excavation,
construction)?

4. Surface clear of obstructions
(i.e. soil piles, equipment,
storage)?

5. Any evidence of large
animal burrows within 15 feet
of the slurry wall?

SURFACE CAP INSPECTION FORM
DOMINION ENERGY – SALT LAKE NORTH OPERATIONS FACILITY

Page 1 of 1
Date of Inspection: Weather Conditions: Inspector's Name/Title:
Item Types of Problems
Condition Present? Observations, Exact Location of Issue
Date and Nature of Repairs/Actions Yes No
Cap
Inspection
Unsealed Surface Cracks?

Subsidence and
Settlement of the
pavement?

Stormwater
system
inspection
Do rain gutter downspout discharge to stormwater system?

Ponding of water near rain
gutter downspouts?

Damage to the concrete
gutters?

Ponding of water on the
parking lot, concrete or
asphalt surfaces?

Build up of
sediment or debris in the stormwater
catch basins?

Blockage of
stormwater influent or
effluent piping?

Well Location:
Date:Project Name:Project No:
AECOM Staff Onsite:Time Onsite:
Other Personnel Onsite:Time Offsite:
Well ID:*Calculated Purge Vol. (gal):Water Quality Meter:
Date:Actual Purge Vol. (gal):Serial Number:
Total Depth (ft BTOC):Purge Method/Equipment:Cal Log Attached:
Depth to Water (ft BTOC):Other Equipment:
Height of Water Column (ft):Depth of Pump Intake (ft BTOC):Serial Number:
Borehole Diameter (in):Start of Purging:Cal Log Attached:
Casing Diameter (in):End of Purging:Flow Rate (gpm):
Prepared By:Date:Page:
of
*pH ***Turb
(NTU)Clarity Color Notes and Comments
Show Purge Volume Calculation Here:
H(ft) = ________________ Annulus Volume (ft3) = ________________ Casing Volume (ft3) = _______________
Purge Volume (ft3) = _______________ Calculated Purge Volume (gallons) = _______________
**Stabilization Requirements: <10% difference over three readings; ***Stabilization Requirements: <5 NTU Turbidity
*Calculate Purge Volume (ft3) = 5 x (Annulus Volume+Casing Volume), where Annulus Volume (ft3) = [H x pi x ((Borehole Diameter/12 x 0.5)2-(Casing Diameter/12 x 0.5)2) x 30%] and
Casing Volume (ft3) = H x pi x (Casing Diameter/12 x 0.5 )2 . Purge Volume (gallons) = 5 x (Annulus Volume (ft3)+Casing Volume(ft3)) x 7.48 gal/ft3
; where H (ft) = Total Depth (ft) - Depth to Water (ft)
Example, where H (ft) = 20 - 8 = 12 ft; borehole diameter = 8.25 in; casing diameter = 2 in
Annulus Volume (ft3) = [12 x pi x ((8.25/12x0.5)2 -(2/12x0.5)2) x 30%] = 1.26 ft3 Casing Volume (ft3) = 12 x pi x (2/12x0.5)2 = 0.262 ft3
Calculated Purge Volume (ft3) = 5 x (1.26 ft3 + 0.262 ft3) = 7.61 ft3; Calculated Purge Volume (gallons) = 7.61 ft3 x 7.48 gal/ft3 = 56.9 gallons (or 4.74 gal/foot)
WELL DEVELOPMENT LOG
Well/Purge Information
Time Vol Removed
(gal)
**Temp
(◦C)
**Cond
(µS/cm)
Rev 0 2019-07
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Date:Project Name:Project No:
AECOM Staff Onsite:Time Onsite:
Other Personnel Onsite:Time Offsite:
Prepared By:Date:Page:
of
Water Level Form
BTOC = Below top of casing
Comment Total Depth
(ft BTOC)
Depth to Water
(ft BTOC)TimeDateLocation ID Depth to NAPL
(ft BTOC)
Rev 0 2019-07
Date:Project Name:Project No:
AECOM Staff Onsite:Time Onsite:
Other Personnel Onsite:Time Offsite:
Instrument:
Model/Serial Number:
Weather:
Date Time Cal Standard Expiration Date Meter Reading Comments
Date Time Cal Standard Expiration Date Meter Reading Comments
Prepared By:Date:Page:
of
Calibration
Calibration Checks
Equipment Calibration Form
Equipment
Rev 0 2019-07
White and Yellow to lab Pink – sample management TAT _________________ Number of Coolers __________ Carrier/Waybill Number ____________________________
CHAIN OF CUSTODY/LABORATORY ANALYSIS REQUEST FORM
URS Corporation  756 East Winchester Street, Suite 400, Salt Lake City, UT 84107  801-904-4000  Fax [phone]
PAGE ____ OF ____
Project Name: Project Number:
ANALYSIS REQUESTED
Project Manager: Report CC:Report CC:
MS
/
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See reverse side for analytical
constituents, methods, and
preservatives.
REMARKS
Project Location:
Field Contact/Phone #Lab Contact/Phone #
Sampler’s Signature Sampler’s Printed Name
FIELD SAMPLE ID SAMPLE
MATRIX DATE TIME
INVOICE INFORMATION
BILL TO:
URS CORPORATION
PO#______________________________
Matrix Key:
GW = Ground Water
SW = Surface Water
SO= Soil
O = Other __________________
SPECIAL INSTRUCTIONS/COMMENTS
SAMPLE RECEIPT: CONDITION/COOLER TEMP: CUSTODY SEALS: Y N
RELINQUISHED BY RECEIVED BY RELINQUISHED BY RECEIVED BY
Signature Signature Signature Signature
Printed Name Printed Name Printed Name Printed Name
Date/Time Date/Time Date/Time Date/Time
Revised Remedial Action Plan
Questar Gas Company
March 2024

APPENDIX B
Hydrasleeve Sampling Procedure

US Patent No. 6,481,300; No. 6,837,120; No. 9,726,013; others pending

Standard Operating Procedure:
Sampling Groundwater with a HydraSleeve TM

Copyright 2023 EON Products
This guide should be used in addition to field manuals and instructions appropriate to
the chosen sampling device (i.e., HydraSleeve, SpeedBag or Super/Skinny Sleeve).

Find the appropriate field manual and instructions on the HydraSleeve website at http://
www.hydrasleeve.com.

For more information about the HydraSleeve, or if you have questions, contact:
EON Products, Inc.
800-474-2490 / 770-978-9971
[e-mail] or [e-mail]
www.HydraSleeve.com & www.EONPro.com

Copyright, EON Products, Inc. 2023.

Table of Contents
Introduction ........................................................................................................................................... 2
Applications of the HydraSleeve .......................................................................................................... 2
Description of the HydraSleeve ............................................................................................................ 3
Selecting the HydraSleeve Size to Meet Site-Specific Sampling Objectives ...................................... 4
Information Required Before Deploying a HydraSleeve ................................................................. 6
Overview: HydraSleeve Operation & Placement ................................................................................. 7
HydraSleeve Operation ................................................................................................................. 7
HydraSleeve Placement ................................................................................................................ 8
Field Procedures for Sampling with the HydraSleeve ....................................................................... 11
I. Assembling the HydraSleeve ............................................................................................. 11
II. Deploying the HydraSleeve ............................................................................................... 12
III. Allowing the Well to Equilibrate ...................................................................................... 12
IV. HydraSleeve Recovery & Sample Collection .................................................................. 13
V. Sample Discharge .............................................................................................................. 14
VI. Measurement of Field Indicator Parameters .................................................................. 14
VII. Alternate Deployment Strategies ................................................................................... 15
Post-Sampling Activities ..................................................................................................................... 17
References ..................................................................................................................................... 18
Table 1. Dimensions & Volumes of HydraSleeve Standard Models ........................................ 5
Standard Operating Procedure: Sampling Groundwater with the HydraSleeve (patents: 6,481,300; 6,837,120; 9,726,013)
2 Copyright 2023 EON Products

Introduction

The HydraSleeve is classified as a passive (no-purge) grab sampling device, meaning that it is
used to collect groundwater samples directly from the screened interval of a well without having
to purge the well prior to sample collection. When it is used as described in this Standard
Operating Procedure (SOP), the HydraSleeve causes no drawdown in the well (until the sample is
withdrawn from the water column) and only minimal disturbance of the water column, because it
has a very thin cross section and it displaces very little water (<100 ml) during deployment in the
well. The HydraSleeve collects a sample from within the screen only. It excludes water from any
other part of the water column in the well through the use of a self-sealing check valve at the top of
the sampler. It is a single-use (disposable) sampler that is not intended for reuse, so there are no
decontamination requirements for the sampler itself.

The use of passive sampling as a means of collecting representative groundwater samples depends
on the natural movement of groundwater (under ambient hydraulic head) from the formation
adjacent to the well screen through the screen. Robin and Gillham (1987) demonstrated the
existence of a dynamic equilibrium between the water in a formation and the water in a well
screen installed in that formation, which results in formation-quality water being available in the
well screen for sampling at all times. Passive (no-purge) sampling devices like the HydraSleeve
collect this formation-quality water, under undisturbed (non-pumping) natural flow conditions.
Samples collected in this manner generally provide more conservative (i.e., higher concentration)
values than samples collected using well-volume purging, and values equivalent to samples
collected using low-flow purging and sampling (Parsons, 2005).

Applications of the HydraSleeve

The HydraSleeve can be used to collect representative samples of groundwater for all analytes
(volatile organic compounds [VOCs], semi-volatile organic compounds [SVOCs], common metals,
trace metals, major cations and anions, dissolved gases, total dissolved solids, radionuclides,
pesticides, PCBs, explosive compounds, 1,4 Dioxane, PFAS, and all other analytical parameters).

Designs are available to collect samples from wells 1” inside diameter and larger. The
HydraSleeve can collect samples from wells of any yield, including low-yield wells. (McAlary and
Barker, 1987).

The HydraSleeve can collect samples from wells of any depth, and it can be used for single- event
sampling or long-term groundwater monitoring programs. Because of its thin cross section and
flexible construction, it can be used in narrow, constricted or damaged wells where rigid sampling
devices may not fit. Using multiple HydraSleeves deployed in series along a single suspension line
or tether, it is also possible to conduct in-well vertical profiling in wells in which contaminant
concentrations are thought to be stratified.
As with all groundwater sampling devices, HydraSleeves should not be used to collect groundwater
samples from wells in which separate (non-aqueous) phase hydrocarbons (i.e., gasoline, diesel fuel
or jet fuel) are present because of the possibility of incorporating some of the separate-phase
hydrocarbon into the sample.
Standard Operating Procedure: Sampling Groundwater with the HydraSleeve (patents: 6,481,300; 6,837,120; 9,726,013)
3 Copyright 2023 EON Products

Description of the HydraSleeve

The basic HydraSleeve (Figure 1) consists of the following components*:

 Just above the self-sealing check valve at the top of the
sleeve are two white strips with holes (A.) to provide
attachment points for the spring clip or suspension tether.

 A suspension line or tether is fixed to a reusable spring clip
that attaches to the holes in the white strips to deploy the
device into and recover the device from the well. ( Factory
assembled, custom tethers can be purchased from the
manufacturer or tethers can be field assembled using
suspension cord. Suspension cord with depth indicators
marked in 1-foot intervals is available from the
manufacturer.)
 A long, flexible, 4-mil thick lay-flat polyethylene sample
sleeve (C.) sealed at the bottom (this is the sample chamber),
which comes in different sizes, as discussed below with a
transparent, self-sealing, reed-type flexible polyethylene
check valve built into the top of the sleeve (B.) to prevent
water from entering or exiting the sampler except during
sample acquisition.
 At the bottom of the sample sleeve are two holes (D) which
provide attachment points for the weight clip and weight.
 A reusable stainless-steel weight with clip (E) or disposable
zip-tie is attached to the bottom of the sleeve to carry it down
the well to its intended depth in the water column. Bottom
weights are available from the manufacturer in sizes from
0.75” OD to 1.5” OD and are available in a variety of lengths.
An optional top weight may be attached to the top of the
HydraSleeve to carry it to depth and to compress it at the
bottom of the well (not shown in Figure 1).

 A discharge tube is included and is used to puncture the
HydraSleeve after it is recovered from the well so the
sample can be decanted into sample bottles (not shown).

Note: The sample sleeve and the discharge tube are designed for one-time use and are
disposable. The Spring Clip, Weight, Weight-Clip and factory-built Suspension Tethers are
dedicated to the well and may be reused.
A.
Suspension Tether
D
..
E.
.
Standard Operating Procedure: Sampling Groundwater with the HydraSleeve (patents: 6,481,300; 6,837,120; 9,726,013)
Copyright 2023 EON Products 4

Selecting the HydraSleeve Size to Meet Site-Specific Sampling Objectives

It is important to understand that each HydraSleeve collects a finite volume of sample based on the
well diameter, length of saturated screen, and size of HydraSleeve because, after the HydraSleeve is
deployed, there is only one opportunity to collect an undisturbed sample, without waiting again for the
well to recover and return to natural flow conditions again. Thus, the volume of sample required to
meet site-specific sampling and analytical requirements will dictate the size of HydraSleeve needed to
meet these requirements.

There are three types of HydraSleeve, Standard HydraSleeve, Super/SkinnySleeve, and Speedbag.
All three are identical in operation however,
 Standard HydraSleeves have white reinforced strips at the top for connecting to a Spring
Clip fastened to the tether, and are available in Low Density Polyethylene (LDPE)
 SuperSleeves have reusable rigid top collars, are available in longer lengths for additional
volume, and they are available in LDPE for general sampling, or High Density Polyethylene
(HDPE) for PFAS sampling.
 SpeedBags have white reinforcing strips at the top for connecting to a Spring Clip and they
have a pair of 1-inch diameter holes above the top valve and below the reinforcing strips that
allows the Speedbags to be used immediately after installation. They are available in LDPE.
SpeedBags require a longer saturated screen to fill than other HydraSleeves.

The volume of sample collected by the HydraSleeve varies with the diameter and length of the
HydraSleeve. Dimensions and volumes of available HydraSleeve models are detailed in Table 1.

Considerations:

 The length of saturated screen required to fill a HydraSleeves is based on using the correct size
HydraSleeve to match the well diameter. Using a HydraSleeve that is smaller in diameter than
recommended will increase the length of saturated screen necessary to fill the sleeve. For
example, 1.5-inch and 1.75-inch diameter HydraSleeves are the optimum size for two-inch
wells and will fill in about the length of saturated screen listed in Table 1. If one of these
samplers is used in a 4-inch well the saturated screen requirements could be 1.5 or more times
the optimum screen lengths listed.

 When using SuperSleeves in wells 4-inch diameter or larger it is recommended to substitute
4x2 Top Collar Adapters instead of the standard Top Collar Assemblies, so that the
SuperSleeve fills in the shortest saturated screen interval.

 The outside diameter of the Heavy-Duty Universal Super/SkinnySleeves is 1.75" however
some Top Collar Assemblies are larger in diameter. 1.66” Top Collars are recommended for
most cases and must be used for 2-inch sch80 wells. 1.9” Top Collars are used for special
applications and require 2-inch sch 40 well casing and larger.

 Do Not use Top Weights with SpeedBags

Standard Operating Procedure: Sampling Groundwater with the HydraSleeve (patents: 6,481,300; 6,837,120; 9,726,013)
Copyright 2023 EON Products 5

Table 1. Dimensions and Volumes of HydraSleeve Models.
Table 1. Standard HydraSleeve Dimensions, Sample Volume and Saturated
Screen Requirements*. Minimum Saturated Screen Required**
Minimum Saturated
Screen Required
Above each
Additional
HydraSleeve**
Item ID Sampler Type
Maximum
Sampler
Volume
Sampler
Dimensions
(Diameter When
Filled with
Sample)
Minimum
Well
Diameter
WITH
Top Weight in 2-
inch Diameter Sch
40 Well.
(FEET)
WITHOUT
Top Weight in 2-
inch Diameter Sch
40 Well.
(FEET)
2-inch Diameter Sch
40 Well
(FEET)
GSH110 HydraSleeve 600mL 1.5" Diameter x
30" Length
1.5" Sch 40
Wells 4.0 5.5 3.0
GSH130 HydraSleeve 1.1L 1.75" Diameter x
37" Length
2" Sch 80
Wells 5.0 6.5 3.5

GSH430 HydraSleeve
SuperSleeve 1.1L 1.75" Diameter x
37" Length
2" Sched 80;
(50mm)
Wells
5.0 7.0 3.5
GSH435 HydraSleeve
SuperSleeve 1.5L 1.75" Diameter x
52" Length
2" Sched 80;
(50mm)
Wells
7.0 9.5 5.0
GSH440 HydraSleeve
SuperSleeve 2.1L 1.75" Diameter x
66" Length
2" Sched 80;
(50mm)
Wells
8.5 12.0 6.5

GSH470
HDPE
HydraSleeve
SuperSleeve
(For PFAS
Sampling)
1.1L 1.75" Diameter x
37" Length
2" Sched 80;
(50mm)
Wells
5.0 7.5 4.0
GSH475
HDPE
HydraSleeve
SuperSleeve
(For PFAS
Sampling)
2.0L 1.75" Diameter x
67" Length
2" Sched 80;
(50mm)
Wells
9.0 12.5 7.0

GSH515 HydraSleeve
SpeedBag 500mL 1.5" Diameter x
30" Length
1.5" Sch 40
Wells
Do Not Use Top
Weight
6.5 with Oscillation
7.5 without
Oscillation
4.0 with Oscillation
5.0 without
Oscillation
GSH510 HydraSleeve
SpeedBag 900mL 1.75" Diameter x
37" Length
2" Sched 80;
(50mm)
Wells
Do Not Use Top
Weight
7.5 with Oscillation
9.0 without
Oscillation
4.5 with Oscillation
6.25 without
Oscillation

4-inch Diameter
Sch 40 Well.
(FEET)
4-inch Diameter
Sch 40 Well.
(FEET)
4-inch Diameter Sch
40 Well
(FEET)
GSH230 HydraSleeve 3L 2.9" Diameter x
37" Length
4" Sch 80
Wells 4.0 6.4 3.3

1.25-inch Diameter
Sch 40 Well.
Oscillation
Recommended
(FEET)
1.25-inch Diameter
Sch 40 Well.
Oscillation
Recommended
(FEET)
1.25-inch Diameter
Sch 40 Well.
Oscillation
Recommended
(FEET)
GSH405 HydraSleeve
SuperSleeve 300mL 0.9" Diameter x
48" Length
1" Sch 40
Wells 7.0 9.5 5.5
* Custom Length HydraSleeves, Custom "TurboSleeves" and "Armored HydraSleeves" are available for special applications.
** All Saturated Screen Lengths are approximate.

Standard Operating Procedure: Sampling Groundwater with the HydraSleeve (patents: 6,481,300; 6,837,120; 9,726,013)
Copyright 2023 EON Products 6

Sample Volume and Custom HydraSleeves
HydraSleeves can be custom-fabricated by EON in varying diameters and lengths to meet
specific volume requirements. HydraSleeves can also be deployed in series (i.e., multiple
HydraSleeves attached to one tether) to collect additional samples to meet specific volume
requirements, as described in “Multi Sampler Deployment”, page 16.
If you have questions regarding the availability of sufficient sample volume to satisfy laboratory
requirements for analysis, it is recommended that you contact the laboratory to discuss the minimum
volumes needed for each suite of analytes. Laboratories often require only 10% to 25% of the volume
they specify to complete analysis for specific suites of analytes, so they can often work with much
smaller sample volumes that can easily be acquired using HydraSleeves.

Information Required Before Deploying a HydraSleeve

Before installing a HydraSleeve in any well, you will need to know the following:

 The inside diameter of the well
 The total depth of the well
 The length of the well screen
 The position of the well screen in the well
 The water level in the well
 The sample volume required by the laboratory

The inside diameter of the well is used to determine the appropriate HydraSleeve diameter for use
in the well. The other information is used to determine the proper placement of the HydraSleeve
in the well to collect a representative sample from the screen (see “HydraSleeve Placement”,
below), and to determine the appropriate length of tether to attach to the HydraSleeve to deploy it
at the intended position in the well.

Most of this information (with the exception of the water level) should be available from the well
log; if not, it will have to be collected by some other means. The inside diameter of the well can be
measured at the top of the well casing, and the total depth of the well can be measured by sounding
the bottom of the well with a weighted tape. The position and length of the well screen may have
to be determined using a down-hole camera if a well log is not available. The water level in the
well can be measured using any commonly available water-level gauge.

Standard Operating Procedure: Sampling Groundwater with the HydraSleeve (patents: 6,481,300; 6,837,120; 9,726,013)
Copyright 2023 EON Products 7

Overview: HydraSleeve Operation & Placement

The HydraSleeve is first installed to a position below the intended sample interval. It is activated
by pulling upward at a rate of ~1 ft per second*, which causes water in the column to be captured
through the top opening and past the check-valve at the same rate the sampler is pulled upward.
As the HydraSleeve moves upward the sides of the sleeve are pulled around the stationary core of
water in the sample interval. The sample interval begins at the installed position of the top of the
HydraSleeve, upward for a distance approximately equal to the length of the HydraSleeve, when
correctly sized to the well diameter.

Operation

*~1 ft per second is about the speed that a person can quickly move their straightened arm in an arc from alongside
their leg to over their head. Some have also compared this to the motion used to “set the hook” when fishing.

1. HydraSleeve is installed
empty, on a suspension tether
below the sample interval in
the saturated screen.

2. Left in-place (still empty)
until the well restabilizes /
equilibrates.

3. To sample, pull upward
rapidly on the tether (~1-ft
per sec) to fill the
HydraSleeve

4. Valve at the top
automatically closes and
seals when HydraSleeve is
full. 1 & 2 3 4 4
Standard Operating Procedure: Sampling Groundwater with the HydraSleeve (patents: 6,481,300; 6,837,120; 9,726,013)
Copyright 2023 EON Products 8

HydraSleeve Placement
The HydraSleeve is designed to collect a sample directly from the saturated well screen. Since the
HydraSleeve is installed empty and flat, it displaces a negligible volume of water and remains
empty until activated.

In all cases, the installed position of the top of the HydraSleeves must be in the saturated screen
and the length of saturated screen above the HydraSleeve must be at least as long as the
HydraSleeve, preferably at least 6-inches longer. This should allow the sampler to fill before the
top of the device reaches the top of the saturated screen as it is pulled up through the water
column and ensures that only water from the screen is collected as the sample.

To optimize sample recovery in wells with short saturated screen length (5 feet or less), it is
recommended that the HydraSleeve be placed in the well so that the bottom weight rests on the
bottom of the well and the top of the HydraSleeve is as close to the bottom of the well screen as
necessary to leave at least one sampler length between the position of the top of the installed
sampler and the top of the saturated screen.

In short-screen wells, or wells with a short water column, it may be necessary to use a top-weight
on the HydraSleeve to compress the top of the sleeve toward the bottom of the well, leaving
sufficient saturated screen to fill the sleeve before it reaches the top of the screen (Figure 4). In
wells where multiple intervals are sampled (profiling) only the bottom HydraSleeve is compressed
by a top-weight.

Example Installations in 10-foot & 5-foot Long Screens

Example 1 (Fig 2): 2” ID SCH 40 PVC well, 50’ total depth, 10’ screen at the bottom of the well,
with water level above the screen (the entire screen contains water). Sampling will be done using,
 One Standard HydraSleeve for a 2-in well. (3-in flat width, 1.75-in filled OD, 38-in long,
1-L volume)
 One Standard Weight (1.5-in OD, 2-in long, 8oz).

Example 2 (Figs 3 & 3a): 2” ID SCH 40 PVC well, 50’ total depth, 5’ screen at the bottom of the
well, with water level above the screen (the entire screen contains water). Sampling will be done
using,
 One Standard HydraSleeve for a 2-in well. (3-in flat width, 1.75-in filled OD, 38-in long,
1-L volume)
 One Standard Weight (1.5-in OD, 2-in long, 8oz).
Standard Operating Procedure: Sampling Groundwater with the HydraSleeve (patents: 6,481,300; 6,837,120; 9,726,013)
Copyright 2023 EON Products 9

Example 2:
5-ft Saturated Screen
INCORRECT Placement (Fig 3)

If the saturated well screen in this example was
only 5’ long, and the 38-in long HydraSleeve
was placed with the weight resting on the bottom
of the well, the HydraSleeve would not fill
within the saturated screen and the sample would
include water from the casing above the screen,
which may not have the same chemistry.
The solution?
Deploy the HydraSleeve with a top weight.
See Figure 3a.

Figure 3. Incorrect placement of HydraSleeve.
Example 1:
10-ft Saturated Screen
Correct Placement (Fig 2)
Deploy the sampler so the weight rests at the
bottom of the well. The top of the sleeve is thus
set at ~40-in above the bottom of the well.

When the sampler is recovered, it will be pulled
upward approximately 38-in before it is filled
and the check-valve at the top closes, which is a
distance of approximately 78-in (6.5 feet) above
the bottom of the well, and far below the top of
the saturated screen.

In this example, only water flowing through the
screen is collected as a sample.

Figure 2. Correct placement of HydraSleeve

Sample
Interval
(~38 in
length)
HydraSleeve
length
= 38-inches

Bottom
Weight
Casing

Saturated
Screen
EMPTY
FULL
Figure 3. INCORRECT placement of HydraSleeve
Sample
Interval
(38-in
length)
FULL
EMPTY
Casing

Screen
HydraSleeve
length
= 38-inches

Bottom
Weight

Standard Operating Procedure: Sampling Groundwater with the HydraSleeve (patents: 6,481,300; 6,837,120; 9,726,013)
Copyright 2023 EON Products 10

These examples illustrate two of the many types of HydraSleeve placements. Multiple
HydraSleeve installations and more complex placements are discussed in a later section.

NOTE: Using smaller diameter HydraSleeves in larger diameter wells causes a slower fill rate.
(For example: 2-inch HydraSleeves in 4-inch wells) Special retrieval methods are necessary if
this is your set up. See “Oscillation”, Section IV, Item 4b. “HydraSleeve Recovery and Sample
Collection”.
Example 2: The Solution

5-ft Saturated Screen
Use a Top Weight (Fig 3a)

Deploy the HydraSleeve with a top weight, so
that the sleeve is collapsed to within 12-in of the
bottom of the well.

Starting at 12 inches from the bottom and
travelling another ~38-in upward to fill the
sleeve is a total of ~54 inches from the well
bottom (4.5ft), so it collects only water from the
screen as the sample.

Sample
Interval
(~38 in
length)
Casing

Stagnant
Water

Saturated
Screen
FULL
EMPTY

HydraSleeve
length
= 38-inches

Bottom
Weight
Figure 3a. Correct placement of HydraSleeve using
a Top Weight to Compress the HydraSleeve.
Sample
Interval
FULL
EMPTY Top Weight

Compressed
Sleeve
Casing

Screen

Standard Operating Procedure: Sampling Groundwater with the HydraSleeve (patents: 6,481,300; 6,837,120; 9,726,013)
Copyright 2023 EON Products 11

Field Procedures for Sampling with the HydraSleeve

Collecting a groundwater sample with a HydraSleeve is usually a simple one-person operation.

I. Assembling the Basic HydraSleeve*

1. Remove the HydraSleeve from its packaging, unfold it, and hold it by its top.

2. Crimp the white reinforcing strips at top of the HydraSleeve by folding the hard
polyethylene reinforcing strips toward each other so that the strips are creased in the
middle (at the holes) and the top of the HydraSleeve is open.

3. Attach the wide end of the spring clip to the holes from inside the HydraSleeve to
ensure that the top will remain open until the sampler is retrieved.

4. Attach the tether to the spring clip with zip-ties or by tying a knot in the tether.

5. Fold the flaps at the bottom of the HydraSleeve so the two holes align, then slide a
zip-tie or weight clip through the holes.

6. Attach a weight to the zip-tie or to the bottom of the weight clip to ensure that the
HydraSleeve will descend to the bottom of the well.
*See Super/SkinnySleeve assembly manual and HydraSleeve Field Manual for specific
instruction for these models.
Note: Alternatively, if spring clips are not being utilized, attach the tether to
one (NOT both) of the holes at the top of the HydraSleeve using a zip-tie from
the hole to the tether or by threading the tether through the hole and tying a
knot in the tether.
Note: Always wear clean protective gloves and safety glasses when handling and
discharging the HydraSleeve.
Note: Before deploying the HydraSleeve in the well, collect the depth-to-water
measurement that you will use to determine the preferred position of the HydraSleeve in
the well. This measurement may also be used with measurements from other wells to
create a groundwater contour map. If necessary, also measure the depth to the bottom of
the well to verify actual well depth to confirm your decision on placement of the
HydraSleeve in the water column.

Use a factory manufactured suspension tether or measure the correct amount of tether
needed to suspend the HydraSleeve in the well so that the weight will rest on the bottom of
the well (or at the preferred position in the well). Allow extra slack in the line if a Top
Weight is used and consider adding a few extra feet of tether at the top of the well to aid in
recovery of the sleeve.
Standard Operating Procedure: Sampling Groundwater with the HydraSleeve (patents: 6,481,300; 6,837,120; 9,726,013)
Copyright 2023 EON Products 12

II. Deploying the HydraSleeve
1. Using the tether, carefully lower the HydraSleeve to the bottom of the well, or to the
preferred depth in the water column.

During installation, hydrostatic pressure in the water column will keep the self-sealing
check valve at the top of the HydraSleeve closed, and ensure that it retains its flat, empty
profile for an indefinite period prior to recovery.

2. Secure the tether at the top of the well by attaching it to a ring, tab, or hook on the bottom of
the well cap . If the weight is resting on the well bottom, leave a few inches of slack in the
line to avoid pulling the sampler up as the cap is removed at the next sampling
event.

III. Allowing the Well to Equilibrate

The installed HydraSleeve should be left undisturbed for some time before sampling to allow
the well to return to its pre-installation flow conditions. This “equilibration time” ensures that
flow dynamics and contaminant distribution restabilize to natural flow conditions to
represent the aquifer conditions after vertical mixing occurs which may be caused by
installation of a sampling device in the well.
 Situation: The HydraSleeve is deployed for the first time in a well or for only one
sampling event.
The basic HydraSleeve is very thin in cross section and displaces very little water (<100
ml) during deployment so, unlike most other sampling devices, it does not disturb the
water column to the point where long equilibration times are necessary to ensure recovery
of a representative sample.
When the SpeedBag version of the HydraSleeve is used, it can be recovered immediately,
or within a few hours with no equilibration time. In regulatory jurisdictions that impose
specific requirements for equilibration times prior to recovery of no-purge sampling
devices, the regulatory requirements should be followed.

 Situation: The HydraSleeve is being deployed for ongoing monitoring or for recovery
during a future sampling event.
In periodic (i.e., quarterly, semi-annual, or annual) sampling programs, the sampler
for the current sampling event can be recovered and a new sampler (for the next
sampling event) deployed immediately thereafter, so the new sampler remains in the
well until the next sampling event.
Note: Make sure that the HydraSleeve is not pulled upward at any time during its descent. If
the HydraSleeve is pulled upward at a rate greater than 0.5 ft per second at any time prior to
recovery, the top check valve will open and some water from the interval where the sampler
was pulled upward will enter the HydraSleeve prematurely.
Note: If using top weights, additional equilibration time is needed to allow the top
weight time to compress the HydraSleeve into the bottom of the well. Allow up to 24
hours in a 2-inch well and less in a 4-inch well.
Standard Operating Procedure: Sampling Groundwater with the HydraSleeve (patents: 6,481,300; 6,837,120; 9,726,013)
Copyright 2023 EON Products 13

Thus, a long equilibration time is ensured and at the next sampling event the sampler
can be recovered immediately. This eliminates the need for separate mobilizations to
deploy and then to recover. HydraSleeves can be left in a well indefinitely and will
represent the aquifer conditions at the time the sampler is pulled upward and recovered.

IV. HydraSleeve Recovery and Sample Collection
1. Slowly remove the well cap a few inches to provide access for a water level measurement.
2. Secure the tether at the top of the well while maintaining tension on the tether (but
without pulling the tether upwards)
3. Measure the water level in the well.
4. Use one of the following 3 retrieval methods. In all 3 scenarios, when the HydraSleeve is full,
the top check valve will close. You should begin to feel the weight of the HydraSleeve on
the tether as it is raised out of the water. The closed check valve prevents loss of sample
and entry of water from zones above the well screen as the HydraSleeve is recovered.

5. Once the sampler is out of the sample interval it is not necessary to pull rapidly. Pull the
tether upward until the HydraSleeve is at the top of the well.

6. Discard the small volume of water trapped above the HydraSleeve check valve by
pinching the across the top of the HydraSleeve under the stiffeners (above the check
valve) and letting the water spill out.
c. Speedbag: SpeedBags require check valve activation and oscillation during
recovery: When retrieving the SpeedBag, pull up hard 1-2 feet (about half the length of
the sampler) to open the check valve; let the assembly drop back down to the starting
point; REPEAT THIS PROCESS 4 TIMES; and then quickly recover the SpeedBag
through the well screen to the surface.
b. Oscillation: When the length of available sample interval is very close to the length of
the sampler or when a smaller diameter HydraSleeve is used in a larger well it may be
recommended that the HydraSleeve is oscillated in the screen zone to ensure it is full before
leaving the screen area. Pull up rapidly 1-3 feet (about half the sampler length), let the
sleeve assembly drop back down, and repeat 3-5 times before pulling the sleeve to the
surface. The collection zone will be the oscillation zone. When in doubt use this retrieval
method.
a. Single Pull: In one smooth motion, rapidly pull the tether up a distance of at least
the length of the sampler (30”to 60”) at a rate of about 1-foot per second (or faster).
This is about the speed one can quickly raise a straightened arm in an arc from their
side to above their head. The motion will open the top check valve and allow the
HydraSleeve to fill in a distance approximately equal to the length of the HydraSleeve
if the sleeve is sized to fit the well.
Copyright 2023 EON Products 14

Standard Operating Procedure: Sampling Groundwater with the HydraSleeve (patents: 6,481,300; 6,837,120; 9,726,013)

V. Sample Discharge

1. Remove the discharge tube from the packaging. *If the HydraSleeves were installed at a previous
sampling event the tubes may have been stored separately until the recovery date.
2. Hold the HydraSleeve at the check valve.

3. Use the pointed end of the discharge tube to puncture the HydraSleeve at least 3-4 inches below
the reinforcement strips. NOTE: For some contaminants (VOC's/sinkers) the best location for
discharge is the middle to bottom of the sampler. This would be representative of the deeper
portion of the well screen.

4. Discharge water from the HydraSleeve into the sample containers. Control the discharge
from the HydraSleeve by either raising the bottom of the sleeve, by squeezing it like a tube
of toothpaste, and/or manipulating the discharge tube.

5. Continue filling sample containers until all are full.

VI. Measurement of Field Indicator Parameters
Field indicator parameter measurement is generally done during well purging and or low-flow
sampling to confirm when parameters are stable, and sampling can begin. Because no-purge
sampling does not require purging, field indicator parameter measurement is not necessary for the
purpose of confirming when purging is complete.

If field indicator parameter measurement is required to meet a specific non-purging regulatory
requirement, it can be done by taking measurements from water within a HydraSleeve after the lab
sample has been collected. Alternatively, a second HydraSleeve may be installed in conjunction
with the primary sample collection HydraSleeve [see Multiple Sampler Deployment below]).

Note: A lightweight portable tripod may be helpful to hold the HydraSleeve during single-person
sampling. (Contact EON)
Be sure you have discarded the water above the check valve – see step #6 above.
Note: Sample collection should be done immediately after the HydraSleeve has been
brought to the surface to preserve sample integrity.
Copyright 2023 EON Products 15

Standard Operating Procedure: Sampling Groundwater with the HydraSleeve (patents: 6,481,300; 6,837,120; 9,726,013)

VII. Alternate Deployment Strategies

Deployment in Wells with Limited (Short) Water Columns

For wells in which only a limited water column needs to be sampled, the HydraSleeve can be
deployed with an optional top weight in addition to a bottom weight. The top weight will
collapse/compress the HydraSleeve to a very short (approximately 6” to 24”) length at the bottom
of the well. This allows the HydraSleeve to fill in a water column that is only 3’ to 10’ in height,
depending on the sampler size. Note: SuperSleeves can be manufactured in longer lengths to
provide greater sample volume and can also be Top Weighted.

Multiple Sampler Deployment

Multiple sampler deployment in a single well screen can accomplish two purposes:
1. It can collect additional sample volume to satisfy site or laboratory-specific sample
volume requirements.
2. It can be used to collect samples from multiple intervals in the screen to allow
identification of possible contaminant stratification.

Figure 4. Multiple HydraSleeve deployment

Figure 4
Spring Clip
Cable Tie
Spring Clip
Cable Tie
Spring Clip
Bottom Weight
NOTES:
 Be sure the top HydraSleeve has a saturated screen length of at least the length of the
sampler (plus at least 6 inches is preferred) above the top of the HydraSleeve initial position
to ensure complete filling within the screen.
 Contact EON for custom suspension tethers for multiple HydraSleeves and for sampler
spacing guidance.

Copyright 2023 EON Products 16

Standard Operating Procedure: Sampling Groundwater with the HydraSleeve (patents: 6,481,300; 6,837,120; 9,726,013)

Optional: 2-Sampler Deployment

If there is a need for only 2 samplers, they can be installed as shown in figure 4 or as follows. The first sampler
can be attached to the tether as described above, a second attached to the bottom of the first using your desired
length of tether between the two and the weight attached to the bottom of the second sampler (figure 5). This
method can only be used with 2 samplers; 3 or more HydraSleeves in tandem need to be attached as described in
“Multi-Sampler Deployment” above.

Figure 5. Alternative method for deploying two HydraSleeves.

In either case, when attaching multiple HydraSleeves in series, more weight will be required to
hold the samplers in place in the well than would be required with a single sampler. Recovery of
multiple samplers and collection of samples is done in the same manner as for single sampler
deployments.

Optional Configurations for Bottom HydraSleeves in Multi-Sampler Installations:
In installations having multiple HydraSleeves, the bottom HydraSleeve can be attached to hang from the bottom of
the suspension tether, in which case the Bottom Weight is attached to the bottom HydraSleeve. This is the
preferred method, especially if the bottom HydraSleeve is compressed using a Top Weight.

Alternatively, the bottom HydraSleeve can be installed alongside the tether so that a length of tether hangs down
below the bottom HydraSleeve. In this case, the Bottom Weight is attached to the bottom of the suspension tether
and a Top Weight isn’t recommended.

Spring Clip
Tether
Spring Clip
Bottom Weight
Copyright 2023 EON Products 17
Standard Operating Procedure: Sampling Groundwater with the HydraSleeve (patents: 6,481,300; 6,837,120; 9,726,013)

Post-Sampling Activities

The recovered HydraSleeve and the sample discharge tubing should be disposed as per the solid
waste management plan for the site.
To prepare for the next sampling event, a new HydraSleeve can be deployed in the well (as
described previously) and left in the well until the next sampling event, at which time it can be
recovered. The weight and weight clip can be reused on this sampler after cleaning as needed per
the site equipment decontamination plan.

The tether may be dedicated to the well and reused or discarded at the discretion of sampling
personnel.

EON Products, Inc.
Email : [e-mail]
Phone : [phone]
Website : www.HydraSleeve.com & www.EONPro.com

Questions & Assistance
Copyright 2023 EON Products 18
Standard Operating Procedure: Sampling Groundwater with the HydraSleeve (patents: 6,481,300; 6,837,120; 9,726,013)
References

McAlary, T. A. and J. F. Barker, 1987, Volatilization Losses of Organics During groundwater
Sampling From Low-Permeability Materials, Groundwater Monitoring Review, Vol. 7, No. 4,
pp. 63-68

Parsons, 2005, Results Report for the Demonstration of No-Purge groundwater Sampling
Devices at Former McClellan Air Force Base, California; Contract F44650-99-D-0005,
Delivery Order DKO1, U.S. Army Corps of Engineers (Omaha District), U.S. Air Force Center
for Environmental Excellence, and U.S. Air Force Real Property Agency

Robin, M. J. L. and R. W. Gillham, 1987, Field Evaluation of Well Purging Procedures,
groundwater Monitoring Review, Vol. 7, No. 4, pp. 85-93