HomeMy WebLinkAboutDERR-2024-012265Proposed Work Plan for Groundwater
Sampling at Residence B and Praxair
Facility
Prepared for:
Linde, PLC; Praxair Distribution, Inc.
6880 South 2300 East
Salt Lake City, UT 84121
Prepared by:
Stantec Consulting Services Inc.
2890 E. Cottonwood Parkway, Suite 300
Salt Lake City, UT 84121
Project No.: 203708160
August 23, 2021
Sign-off Sheet and Signature of Environmental Professional
203708160/05_report_deliv/deliverables/UDEQGWater/2021/PWkPlan-GWater 1
This Proposed Work Plan for Groundwater Sampling at Residence and Praxair Facility report was
prepared by Stantec Consulting Services Inc. (“Stantec”) for Praxair Distribution, Inc. (PDI, the
“Client”). The material in it reflects Stantec’s professional judgment in light of the scope, schedule
and other limitations stated in the document and in the contract between Stantec and the Client.
The opinions in the document are based on conditions and information existing at the time the
document was published and do not take into account any subsequent changes. In preparing the
document, Stantec did not verify information supplied to it by others. Any use which a third party
makes of this document is the responsibility of such third party. Such third party agrees that Stantec
shall not be responsible for costs or damages of any kind, if any, suffered by it or any other third
party as a result of decisions made or actions taken based on this document.
Prepared by:
John G. Russell, III, CPG
Sr. Hydrogeologist, Environmental Risk Manager
Reviewed by:
Rich Pratt
Sr. Environmental Technician
PROPOSED WORK PLAN FOR GROUNDWATER SAMPLING AT RESIDENCE B AND PRAXAIR
FACILITY
203708160/05_report_deliv/deliverables/UDEQGWater/2021/PWkPlan-GWater i
Table of Contents
1.0 SUMMARY ....................................................................................................................1.1
2.0 PROPOSED DRILLING AND GROUNDWATER SAMPLING PROGRAM .........................2.1
2.1 PROPOSED DRILLING AND SAMPLING METHODOLOGY .......................................... 2.1
2.2 QUALITY ASSURANCE/QUALITY CONTROL (QA/QC) PROGRAM ............................ 2.2
3.0 PREPARATION OF A SUMMARY REPORT .....................................................................3.1
4.0 TENTATIVE SCHEDULE ..................................................................................................4.1
LIST OF FIGURES
Figure 1 General Site Location Map
Figure 2 Proposed Boring Location Map
PROPOSED WORK PLAN FOR GROUNDWATER SAMPLING AT RESIDENCE B AND PRAXAIR
FACILITY
SUMMARY
August 23, 2021
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1.0 SUMMARY
On behalf of Praxair Distribution, Inc. (PDI), Stantec Consulting Services, Inc. (“Stantec”) has
prepared this Proposed Work Plan for Groundwater Sampling at Residence B and Praxair Facility
report to outline proposed drilling, sampling, and quality control protocol to be implemented
during the proposed drilling of soil test borings for the collection of groundwater samples at the
‘Residence B’ located at 2202 Pink Coral Circle and the nearby PDI facility in Cottonwood
Heights, Utah. Currently, it is anticipated that the proposed sampling program will be
implemented at the same time when the Fall 2021 semi-annual groundwater sampling event is
conducted (tentatively scheduled for late-September or early-October 2021, depending on
finalization of a Site Access Agreement and subcontractor availabilities, etc.). Reference Figure
1 for the location of the residence in relation to the nearby PDI facility and Figure 2 for the
proposed boring locations.
Trichloroethylene (TCE) and similar chlorinated aliaphatic hydrocarbon constituents have been
detected historically within groundwater monitoring well MW-2 located at the PDI property and
down-gradient, neighborhood monitoring well MW-6, located west of the residence, as
identified on the figures. The primary intent of the proposed characterization activities will be to
investigate if, and to what degree, ground water quality might be impacted by TCE and other
similar constituents in the vicinity of the Residence B and areas located in a presumed
upgradient direction (groundwater flow generally from the east/southeast toward the
west/northwest), generally along the western PDI facility property boundary and cross-gradient
from PDI monitoring wells MW-2 and MW-3 (reference Figure 2).
At each of the proposed boring locations identified on Figure 2, groundwater samples will be
collected utilizing the same direct-push drilling and GeoProbe HydroPunchTM water sampling
methodology used previously throughout the neighborhood, including use of a peristaltic pump
and new, disposable poly-tubing. Standard Operating Procedures (SOPs) and Quality
Assurance/Quality Control (QA/QC) protocol will be administered in similar fashion as proposed
initially within Stantec’s February 2008 Site Investigation Plan report and conducted subsequently
during GeoProbe HydroPunchTM off-site groundwater quality investigations in the neighborhood.
In similar fashion as conducted during previous semi-annual, groundwater purging and sampling
events, Stantec will also purge and sample existing groundwater monitoring wells MW-1 through
MW-9, during the same week as drilling/sampling of the proposed HydroPunchTM borings.
Groundwater samples will be be analyzed for Volatile Organic Compounds (VOCs, including
TCE and other similar chlorinated aliphatic hydrocarbons) by Method 8260D, with results
reported to the Method Detection Limits (MDLs), which are less than laboratory Reporting Limits
(RLs) of 2 micrograms per liter (aka, parts per billion-ppb) for most VOCs including TCE. It is
anticipated that Utah Department of Environmental Quality (UDEQ) and United States
Environmental Protection Agency (US EPA) risk-based, Maximum Contaminant Levels (MCLs) for
PROPOSED WORK PLAN FOR GROUNDWATER SAMPLING AT RESIDENCE B AND PRAXAIR
FACILITY
SUMMARY
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groundwater quality, as well as Residential Vapor Intrusion Screening Levels (VISLs) deemed
protective against potential vapor intrusion, will be used for preliminary screening of analytical
results (aka, ‘Screening Levels’).
Following receipt of the Level III QA/QC analytical result report, Stantec will prepare a Summary
Report that details the field activities, qualitative observations, and quantitative analytical
results. The report will include a copy of the laboratory result report as an appendix and a
comparative analysis of the results in terms of potential Screening Levels.
PROPOSED WORK PLAN FOR GROUNDWATER SAMPLING AT RESIDENCE B AND PRAXAIR
FACILITY
PROPOSED DRILLING AND GROUNDWATER SAMPLING PROGRAM
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2.0 PROPOSED DRILLING AND GROUNDWATER SAMPLING
PROGRAM
2.1 PROPOSED DRILLING AND SAMPLING METHODOLOGY
Reference Figure 2 for proposed boring locations within the Residence B yard and the PDI
facility. Final drill locations will be approved in the field by the owners of the Residence B and PDI
and as might be dictated by field, buried utility, and/or other site accessing constraints. To
permit access for the drill rig to enter the residence backyard, Stantec will subcontract the
services of a fencing contractor, who will temporarily remove (and then replace/repair, after
drilling) at least a eight- to nine-feet wide section of the home’s perimeter, cedar fence near the
southwest corner of the residence.
On behalf of PDI, Stantec will subcontract a Utah-certified, water well drilling firm for the direct-
push, HydroPunchTM borings. Prior to drilling, buried utility lines will be cleared through the
Residence B owner, PDI, Blue Stakes Utility Locators of Utah, and the nationally-recognized utility
locating firm Ground Penetrating Radar Systems, LLC (GPRS). Where practicable, the upper
couple of feet of each proposed boring loation will be investigated using a hand shovel to
investigate for possible buried, irrigation water lines, prior to drilling.
Each boring will be drilled and sampled with use of a GeoProbeTM drill rig, whereby steel drilling
rods, equipped with an approximate 3.25-inch diameter, steel drive-point, are pushed
hydraulically into the subsurface. The boring will be advanced to an approximate depth of a
couple of feet below the water table (anticipated to be approximately 11 to 13 feet below
grade), at which point a water sample will be collected.
Once each borehole is advanced to the desired completion depth, and groundwater allowed
to enter the boring, new, disposable, 0.5-inch diameter, poly-tubing will be extended inside the
drill rods from the ground surface down to an approximate depth of one-foot above the
borehole completion depth. Then, an above-grade, peristaltic pump will be connected to the
end of new, disposable poly-tubing at the ground surface and used to pump ground water from
the borehole for low-flow sampling.
In similar fashion as conducted during previous semi-annual, groundwater purging and sampling
events, Stantec will also purge and sample existing groundwater monitoring wells MW-1 through
MW-9, during the same week as drilling/sampling of the proposed HydroPunchTM borings. All
ground water samples will be collected by Stantec's field techician, using new disposable, latex
gloves and a decontaminated “Flow-through Cell System” water sampling network, in
accordance with ‘low-flow’ ground water sampling protocol used previously at the site (i.e.,
generally between 0.3 to 0.5 liters per minute [l/min.]). Each ground water sample will be
collected within laboratory-provided sample containers, which in turn will be placed on ice in a
laboratory-provided cooler, before being hand-delivered to the Utah-certified, American West
PROPOSED WORK PLAN FOR GROUNDWATER SAMPLING AT RESIDENCE B AND PRAXAIR
FACILITY
PROPOSED DRILLING AND GROUNDWATER SAMPLING PROGRAM
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Analytical Laboratories (AWAL) for quantitative analysis of VOCs, including TCE, by US EPA
Method 8260D. When filling the sample bottles, care will be administered to fill each container
completely to prevent potential volatilization, etc.
Following sample collections, each of the proposed HydroPunchTM boreholes will be abandoned
with bentonite pellets being backfilled from the bottom of the borehole flush to the ground
surface. All sampling and analysis protocol will be administered in similar fashion as performed
during past HydroPunchTM investigations conducted in the neighborhood historically, as well as
for years as part of PDI's routine, semi-annual, ground water monitoring program. Strict QA/QC
and Chain-of-Custody (CoC) protocol will be administered throughout the sampling program,
including hand-delivery of the samples to the laboratory.
2.2 QUALITY ASSURANCE/QUALITY CONTROL (QA/QC) PROGRAM
All QA/QC protocol will be administered in accordance with measures implemented previously
at the site. The laboratory will provide Level III laboratory reporting and QA/QC protocol as
during previous investigations.
One (1) MS/MSD will be collected for each matrix and analyte at a frequency of one per 20
samples; i.e., 5%. One (1) blind field duplicate will be collected from one of the backyard water
samples and submitted to the laboratory for VOC analysis. If the UDEQ decides to split a water
sample, Stantec and the UDEQ will plan in advance, accordingly. The Duplicate and any split
samples will be analyzed for VOCs including TCE, with each laboratory reporting to corollary
MDLs in an attempt to report to the lowest concentrations practicable (i.e., below 2 ppb).
Data quality will be ensured through use of sampling equipment and protocol prescribed herein,
adherence to the requirements of Method 8260D for quantitative analysis of VOCs, and strict
adherence to the QA/QC protocol established for this project under the VCP as well as the
laboratory QA/QC programs. QA/QC procedures will be used to ensure that the data collected
will be adequate for their intended purposes which is to provide analytical results that are
comparable to historical groundwater quality monitoring needs and information on which future
site management decisions may be based.
The QA/QC procedures pertain to: 1) sampling requirements, containers, and preservation; 2)
cross contamination; 3) QA/QC samples; 4) Chain-of-Custody, labeling, and recordkeeping; 5)
field instrumentation quality control; and, 6) Data Quality Indicators (precision, accuracy,
representativeness, comparability, and completeness [PARCC parameters]). All sample
containers and ice chests will be provided by the laboratories. The potential for cross
contamination among samples will be minimized by using new, clean laboratory-supplied
sample containers; new disposable, poly-tubing; and changing new disposable, nitrile or latex
gloves before each sample is collected.
Upon collection of each water sample, each sample container will be labelled as to sample
identification, date, and analyses. Stantec will retain Field Notes generated during all sampling
PROPOSED WORK PLAN FOR GROUNDWATER SAMPLING AT RESIDENCE B AND PRAXAIR
FACILITY
PROPOSED DRILLING AND GROUNDWATER SAMPLING PROGRAM
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activities. Prior to hand-delivery of samples to the laboratory, Stantec will make a final
comparative analysis between sample container labels and the Chain-of-Custody notation.
Lastly, laboratory analyses will be performed within the required holding times and reported in
appropriate and consistent (comparable) units.
PROPOSED WORK PLAN FOR GROUNDWATER SAMPLING AT RESIDENCE B AND PRAXAIR
FACILITY
PREPARATION OF A SUMMARY REPORT
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3.0 PREPARATION OF A SUMMARY REPORT
Following receipt of the laboratory result report, Stantec will prepare a Summary Report for
submittal to the UDEQ. The report will detail the field activities, qualitative observations,
quantitative analytical results, and include a copy of the laboratory result report. The report will
be fashioned in similar format as previous routine, semi-annual, summary reports and include
figures identifying proposed/new boring locations, existing monitoring well locations, and
groundwater flow potentiometric data, as well as tabulated laboratory result data, comparative
analysis of results to corollary UDEQ Screening Levels, and a copy of the actual laboratory result
report.
As conducted historically, analytical data will be evaluated in accordance with QA/QC
protocol outlined herein and Level III laboratory reporting requisites. The results of the data
evaluation and a discussion of any impacts on data usability will be discussed in the report.
PROPOSED WORK PLAN FOR GROUNDWATER SAMPLING AT RESIDENCE B AND PRAXAIR
FACILITY
TENTATIVE SCHEDULE
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4.0 TENTATIVE SCHEDULE
In consideration of the need for expediency for implementation of this project, Stantec is in the
process currently of soliciting availability timeframes for the services of all subcontractors
anticipated to be required as part of this project. The intent is to implement the proposed
actions as soon as subcontractors have availability and as deemed acceptable by the
Residence B owner; i.e., as soon as practicable. Stantec/PDI and the Residence B owner will also
orchestrate a Site Access Agreement.
In light of current busy schedules of all subcontractors, and depending on the timing of when
Praxair receives formal ‘approval’ of this Plan by the UDEQ, it is anticipated that this tentative
schedule is subject to possible change. Stantec anticipates that the temporary fence removal
before drilling could require approximately 0.5-day, while follow-up (post-drilling), fence repair
could require another 0.5-day. Stantec anticipates that the utility locates could require a 0.5-day
to complete, while drilling could require 2-days to complete. The fence removal and utility
clearnaces must be completed prior to the drilling. It is anticipated that the entire, projected
time for completing all field activities could require a cumulative timeframe of two to four weeks,
depending on contractor availabilities.
It is anticipated that Stantec will receive the laboratory result report within approximately two (2)
weeks following sample submittals. It is anticipated that Stantec should be positioned to submit
the Summary Report to the UDEQ within approximately six (6) to eight (8) weeks following receipt
of the laboratory result report. Thus in summary, it is anticipated that the entire project could be
completed within a tentative timeline approximating two months of receipt of UDEQ ‘approval’
of this Proposed Work Plan.
PROPOSED WORK PLAN FOR GROUNDWATER SAMPLING AT RESIDENCE B AND PRAXAIR
FACILITY
FIGURES
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FIGURES
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This document is for reference purposes only and should not be used as a legal document. Stantec makes no guarantees to the accuracy of the data contained herein or any loss resulting therefrom.
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RESIDENCE AND PRAXAIR
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7/8/2014
PROJECT B.A 08160.00
Basemap: Source: Esri, DigitalGlobe, GeoEye, i-cubed, USDA, USGS, AEX, Getmapping, Aerogrid, IGN, IGP, swisstopo, and the GIS User Community
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Proposed Groundwater Sampling
Borings
DRAWN BY: JR 1ST REVIEW: RF 2ND REVIEW: RP
DATE: 7/30/2021 PROJECT NO: 203708160
Disclaimer: Stantec assumes no responsibility for data supplied in electronic format. The recipient accepts full responsibility for verifying the accuracy and completeness of the data. The
recipient releases Stantec, its officers, employees, consultants and agents, from any and all claims arising in any way from the content or provision of the data.
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