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Former Varian Facility - Vapor Intrusion Assessment Work Plan
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Fendler, Thomas <[e-mail]>Fri, Aug 25, 2023 at 11:37 AM
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"McGrath, Angus" <[e-mail]>
Please accept the attached submittal for the Former Varian Facility located at 1678 Pioneer Road, Salt lake City, UT.
Let me know if you also need a paper copy of this report?
Tom Fendler
Senior Geologist
Direct: 801 743-4843
Mobile: [phone]
Fax: [phone]
[e-mail]
Stantec
2890 East Cottonwood Parkway Suite 300
Salt Lake City UT 84121-7283
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Varex VI WP 08_25_2023_final.pdf
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DSHW-2023-208481
VAPOR INTRUSION ASSESSMENT WORKPLAN
INTRODUCTION
August 25, 2023

Vapor Intrusion Assessment
Workplan

Former Varian Medical Systems Facility
1678 Pioneer Avenue
Salt Lake City, Utah

Prepared for:
Varian Medical Systems
801 Pennsylvania Ave. NW, Suite 520
Washington, DC 20004 USA
Prepared by:
Stantec Consulting Services Inc.
2890 East Cottonwood Parkway, Suite 300
Salt Lake City, UT 84121

Project No: 203722651

August 25, 2023
VAPOR INTRUSION ASSESSMENT WORKPLAN
INTRODUCTION
July 20, 2023

This document entitled Vapor Intrusion Assessment Workplan was prepared by Stantec Consulting
Services Inc. (“Stantec”) for the account of Varian Medical Systems (the “Client”). Any reliance on this
document by any third party is strictly prohibited. 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 consider 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
because of decisions made or actions taken based on this document.

Prepared by
(signature)
Patrick H. Vaughan, Principal & National SME Vapor Intrusion

Reviewed by
(signature)
Angus E. McGrath, Senior Principal

Approved by
(signature)
Tom Fendler, Senior Geologist

VAPOR INTRUSION ASSESSMENT WORKPLAN
INTRODUCTION
August 25, 2023
i

Table of Contents
1.0 INTRODUCTION ............................................................................................................. 1
2.0 SCOPE OF WORK ........................................................................................................... 1
2.1 PRE-FIELD WORK ......................................................................................................... 1
2.2 SUB-SLAB SOIL GAS SAMPLING ................................................................................. 1
2.2.1 Soil Vapor Sample Collection ......................................................................... 2
2.3 SUB-SLAB SOIL GAS LABORATORY ANALYSIS ......................................................... 4
2.4 INDOOR AIR SAMPLING ............................................................................................... 4
2.4.1 Pre-Sampling Building Walk-through and Survey ........................................... 4
2.4.2 Field Sampling Equipment ............................................................................. 5
2.4.3 Indoor Air Sampling-EPA Method TO-15 SIM ................................................ 5
2.4.4 Outdoor Air Sampling-EPA Method TO-15 SIM .............................................. 6
2.4.5 Collection of Quality Control Samples ............................................................ 6
2.4.6 Meteorological Data ....................................................................................... 7
2.4.7 Laboratory Analysis ........................................................................................ 7
2.4.8 Documentation ............................................................................................... 7
2.4.9 Photographs ................................................................................................... 8
2.4.10 Chain-of-Custody ........................................................................................... 8
2.4.11 Decommissioning of Soil Vapor Probes ......................................................... 8
2.4.12 Reporting ...................................................................................................... 8
LIST OF TABLES
Table 1 – EPA Method TO15 SIM Laboratory Reporting Limits
Table 2 – Radiello 130 SE Laboratory Reporting Limits
Table 2.4.7 – TO-15 SIM Target Chemicals in Indoor/Outdoor Air and Reporting Limits
LIST OF FIGURES
Figure 1 – Site Location Map
Figure 2 – Site Plan
Figure 3 – Site Plan with Sample Locations
LIST OF ATTACHMENTS

ATTACHMENT A SAMPLE COLLECTION LOGS
ATTACHMENT B VAPOR PIN® STANDARD OPERATING PROCEDURES
ATTACHMENT C BUILDING SURVEY FORM

VAPOR INTRUSION ASSESSMENT WORKPLAN
INTRODUCTION
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1.0 INTRODUCTION
On behalf of Varian Medical Systems (Varian), Stantec Consulting Services Inc. Stantec) has prepared
this work plan to conduct indoor/outdoor air and sub-slab soil gas sampling at the former Varian Medical
Systems facility in Salt Lake City, Utah, located at 1678 Pioneer Avenue in Salt Lake City, Utah (“the
Site”) (Figure 1).
2.0 SCOPE OF WORK
The proposed scope of work includes: 1) Pre-field work activities; 2) collection of sub-slab soil gas
samples 3) the collection of concurrent indoor air and outdoor air samples to assess potential vapor
intrusion from previously identified VOC sources. The following sections provide detailed descriptions of
the work proposed.
2.1 PRE-FIELD WORK
Prior to conducting any field work, Stantec will update the existing site-specific health and safety plan
(HASP) in accordance with 29 CFR 1910.120. The HASP will detail field procedures regarding various
potential safety hazards that may be encountered during site activities. Utility clearance of the proposed
drilling locations to ensure that subsurface utilities are not intercepted during the drilling activities will be
required and coordinated and conducted by Stantec staff. Stantec will mark proposed drilling locations
and one call locating service Blue Stakes of Utah will be contacted at least 48 hours prior to installation of
sub-slab points.
Stantec proposes to perform this assessment when the soil vapor extraction (SVE) system is not
operating and the SVE system will be turned off at least 48 hours prior to sample collection. Shutting
down the SVE system prior to collecting sub-slab samples is proposed to evaluate the potential for vapor
intrusion during static conditions with no influence from the SVE system.
2.2 SUB-SLAB SOIL GAS SAMPLING
Up to 5 sub-slab soil gas probes will be installed in the approximate locations shown on Figure 2 and
Figure 3 using Vapor Pins® distributed by Vapor Pin Enterprises, Inc. of Plain City, Ohio. Vapor Pins®
offer a simplified probe installation and are suited for temporary or semi-permanent probes. The probe
assembly is fitted with the manufacturer-supplied silicon sleeve and then driven through the concrete slab
of a minimum thickness of 4.5 inches using a previously drilled small diameter hole. Thus, the VaporPin®
is considered acceptable for the reported slab thickness of approximately 12 inches at the proposed
sample locations. The installer will follow the standard operating procedures provided in Attachment B,
except that the water dam method for seal check will not be used. A hammer drill will be used to drill
holes for the installation of sub-slab probes. Installation of VaporPins® will be coordinated with Varex
Imaging (Varex) staff and will be placed in locations which do not interfere with Varex operations.
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2.2.1 Soil Vapor Sample Collection
Stantec personnel will maintain detailed notes during the sub-slab soil vapor sample collection activities.
Notes will include weather conditions, leak test data, purge data, and sample collection/tracer gas
monitoring data. A soil vapor sample collection data log for the Site is included in Attachment A.
2.2.1.1 Procuring Equipment and Supplies
Stantec will contact a State of Utah-certified laboratory, to coordinate shipment of the appropriate sample
containers and equipment to perform soil vapor sampling. Coordination between Stantec and the
laboratory will include establishing arrival times of the samples to ensure the laboratory has sufficient time
to analyze soil vapor samples within the required hold time.
Stantec will request that the laboratory provide the following supplies for the sampling event:
• 10% (batch) certified 1-liter (L) Summa™ canisters paired with laboratory-provided flow
controllers (with built-in particulate filters) calibrated to an inflow of approximately 175 milliliters
per minute (mL/min) – one for each soil vapor probe, one for a duplicate, and one spare to be
used in the event of canister failure.
• Sampling tee for duplicate sample collection
• One 10% (batch) certified 6-L Summa™ canister – for use as a purge canister
Each Summa™ canister will be equipped with a laboratory-supplied flow controller set to collect samples
at a flow rate of approximately 175 ml/min and a vacuum gauge. The laboratory will measure and record
canister vacuum using their fixed, calibrated equipment as well as the canister-assigned vacuum gauges.
Upon receipt, the initial vacuum of each canister will be recorded by Stantec using laboratory-supplied
vacuum gauges. Laboratory and field vacuum measurements will be compared to determine if vacuum
loss has occurred during shipment.
2.2.1.2 Leak Testing
Leakage of atmospheric air into the sampling equipment during sample collection can compromise
sample integrity and dilute measured soil vapor concentrations, possibly to the point that the
concentration is below the method detection limit (MDL; i.e., a false negative). Contaminants in ambient
air can also enter the sampling system and be detected in the sample from a non-contaminated sampling
probe (i.e., a false positive). Air leakage can occur at the land surface into the probe and, more likely,
through loose fittings in the above-ground sampling equipment.
To avoid leaks, the connections, fittings, and other parts associated with the sampling equipment will be
checked to verify that they are tightly fit. The soil vapor purging and sampling rate will also be kept low
(<200 mL/min).
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To test for leaks, two methods will be used. The first method involves performing a qualitative vacuum
test (shut-in test) on the above-ground sampling equipment. This test will be performed by closing all of
the sampling valves and applying a vacuum of approximately 100 inches of water column [in W.C.] on the
sampling equipment. If constant vacuum is maintained for at least 2 minutes, the sampling equipment will
pass the vacuum test. The results of the vacuum leak test will be recorded on the soil vapor sample
collection data log provided in Attachment A.
The second method involves using a tracer gas or liquid tracer to test for ambient air leakage into the
sampling system. Depending on availability, either helium or the leak check compound 1,1-difluoroethane
(1,1-DFA) will be used as a tracer compound. A shroud will be placed over the sampling set up to include
the vapor probe, above ground tubing and Summa® canisters. The shroud will be clear enough to allow
the vacuum gauges to be visible and will be used to contain the tracer gas during sample collection.
2.2.1.3 Purging
After the sampling equipment passes the shut-in test, Stantec will purge the implant and tubing of three
internal volumes to remove stagnant, internal air from the sample train and borehole. The “internal
volume” of the probe including the above and below ground tubing plus the vapor pin pore space will be
calculated. Using a purge canister or syringe, Stantec will purge the soil vapor probes at a flow rate that
will not exceed the sampling flow rate of less than 200 mL/min. Once the total volume to purge has been
determined, the purge time will be calculated by dividing the total purge volume by the purging flow rate of
(e.g. 200 mL/min).
The following equation will be used to calculate the purge volumes:
System Volume:

Annulus Volume:

Purge data for each probe will be recorded on the log provided in Attachment A. Each location will be
sampled immediately following purging, as described in the following section.
2.2.1.4 Collecting Sub-Slab Soil Vapor Samples
With the leak test enclosure still in place, collection of soil vapor from a particular vapor probe will begin.
Each sample will be collected in a 1-L Summa™ canister at an approximate flow rate of approximately
175 mL/min. After the Summa™ canister valve is opened and the canister begins to fill, the vacuum
gauge on the flow controller will be observed to verify that the vacuum in the canister is decreasing over
time. If the flow controller is working correctly, it will take approximately 10 minutes for the vacuum to
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decrease to 5 in Hg; however, the actual sampling duration may be slightly more or less than 10 minutes.
The Summa™ canister valve will be closed, and sampling will cease when a residual vacuum of 5 in Hg is
obtained.
A duplicate sample will be collected from one of the soil vapor probes concurrent with the primary sample
using a separate Summa™ canister and flow valve and a laboratory-supplied sampling tee. Stantec will
attempt to collect all the planned samples on the same day.
Sample collection and tracer gas monitoring data for each probe will be recorded on the soil vapor
sample collection data log provided in Attachment A.
2.3 SUB-SLAB SOIL GAS LABORATORY ANALYSIS
All sub-slab soil gas samples will be submitted to the project laboratory for analysis of VOCs using EPA
Method TO-15 in the full scan mode. The target compounds will include those provided in Table 1 of
Section 2.5.8. If 1,1-DFA is used as the leak check compound, since it is not a target compound for EPA
Method TO-15, it will be specifically requested in advance to the project laboratory and on the sample
chain-of-custody. If helium is used, samples will be analyzed by EPA Method TO3 or ASTM D1946. for
helium.
2.4 INDOOR AIR SAMPLING
Concurrent with sub-slab soil vapor sampling, Stantec will collect indoor air samples at seven locations
within the building. These locations are near the selected sub-slab soil vapor sampling locations.
Proposed sample locations are shown on Figure 3. The indoor air sampling will include the following
procedures.
2.4.1 Pre-Sampling Building Walk-through and Survey
Following notice to UDEQ, and a minimum of 24-hours prior to sample collection, Stantec will conduct a
pre-sampling building walk-through and survey. At this time final indoor and outdoor air sampling
locations will be identified. The building survey is intended to identify conditions that may affect or
interfere with the proposed testing. Stantec will evaluate for the presence of heating, ventilation, and air
conditioning (HVAC) intakes and vents, including the number and location of air handlers and make-up air
intakes. Stantec will request information regarding the operational parameters of the system and zone
configuration.
Information from the pre-sampling survey and walk-through will be recorded on an Indoor Air Quality
Building Survey form (Attachment C), which will include a building chemical storage and use inventory.
Copies of the air sampling field data forms are included in Attachment A. A minimum of one Building
Survey will be completed for the rooms where the sub-slab/indoor air samples will be collected.
Field measurement of total VOCs will be performed using a photoionization detector capable of
measurement in the parts per billion range to identify potential locations of background sources or
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locations of possible soil gas entry into the building (i.e. preferential pathways such as utility connections).
Direct measurement readings will be recorded on the Building Survey Form (Attachment C).
2.4.2 Field Sampling Equipment
Air samples for laboratory analysis will be collected either in 6-liter stainless steel, passivated Summa™
canisters designed specifically for collecting indoor and outdoor ambient air samples or using passive
diffusion sorbent cartridges as described below. Each 6-liter indoor air Summa™ canister will be
individually certified pursuant to EPA Method TO-15 selective ion monitoring (SIM) mode. Individual
certification means that each laboratory-supplied canister will have been cleaned (using a combination of
dilution, heat and high vacuum), then sampled and analyzed for the laboratory’s EPA Method TO-15 SIM
analyte list to verify concentrations of chemicals of concern (COCs) are below project reporting limits.
Each Summa™ canister will be equipped with a flow regulator set to collect a sample over an eight (8)
hour duration. The canister will be pre-evacuated by the laboratory to approximately -30 inches of
mercury (Hg).
The laboratory will measure and record the canister vacuum using both their fixed (digital), calibrated
equipment and analog gauges provided by the lab for field use at the time of shipment. The purpose of
this process is to assess variability in measurement between calibrated vacuum gauges (typically used for
reporting “receipt” vacuum) used and field gauges supplied by the laboratory (∆P digital-analog). This
data will then be used to evaluate occurrence of leaks during return shipment of canisters to the
laboratory. Upon receipt, the initial vacuum of each canister will be measured and recorded by Stantec.
Laboratory and field vacuum measurements will be compared to determine if there is evidence that
vacuum loss occurred during shipment.
To ensure that the collected samples will meet the planned end use for this study, the following sampling
guidelines consistent with guidance provided by the project laboratory will be followed.
1. If the initial vacuum gauge reads less than 26 inches of Hg (in. Hg), the canister will be replaced prior
to sample collection.

2. If the final vacuum gauge reads greater than 20 in. Hg at the end of the sampling duration, the end
vacuum will be confirmed using a different vacuum gauge. If the vacuum is confirmed to be greater
than 20 in. Hg, the sample will be rejected.

3. The time-integrated sampling process will be monitored periodically with the assumption that the
volume of air sampled is a linear function of the canister vacuum. Corrective action may be required,
particularly if a canister is filling too quickly. If canister vacuum drops to near ambient (<2 in. Hg) at a
rate indicative of flow controller failure, improper setting or leak, before corrective action is taken, the
sample will be considered a grab sample or discarded.
2.4.3 Indoor Air Sampling-EPA Method TO-15 SIM
Each indoor air sample collection device will be positioned at a height representing the normal breathing
zone (approximately 3 to 5 feet above ground surface). Sample collection devices may be placed on a
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desk, table, cabinet, or possibly a tripod or similar device so that the sampling location will be at the
correct height. The following air sampling procedure will be used:

To start the sampling event:
1. Place the canister in the proper location.

2. Record the initial vacuum (approximately -30 inches of Hg) of the canister on the Air Sampling Log (a
copy of the log is presented in Attachment 2).

3. Using a wrench, remove the closing bolt on the top of the canister and attach the flow controller
device, tighten with a wrench (with filter in-line), open the canister bellows valve, and note the start
time. Start any replicate (co-located) canisters at the same time.
To complete the sampling event:
1. Close the canister bellows valve and note the stop time on the Air Sampling Log.

2. Using a wrench, detach the flow controller. If the laboratory uses quick-connect fittings, a wrench will
not be necessary.

3. Replace the closing bolt on top of the canister and tighten with a wrench. Record the final vacuum of
the canister (approximately -2 to -4 inches of Hg) on the Air Sampling Log.
2.4.4 Outdoor Air Sampling-EPA Method TO-15 SIM
Two outdoor air samples will be collected from locations determined at the time of sampling to be in
upwind and downwind positions relative to the building at an approximate distance from the building of
twice the building height and six feet off the ground surface.
Outdoor air sample collection will begin within one hour of the start of the corresponding indoor air
sampling, and the sample duration will correspond with the indoor air sample duration (e.g., 8 hours).
Collection will follow the same protocol described for indoor air sample collection.
2.4.5 Collection of Quality Control Samples
Quality Control (QC) samples will consist of performance samples and field duplicate samples. These
samples will be collected at the frequency described below.
2.4.5.1 Field Duplicate/Replicate Samples
Field duplicate samples for sub-slab soil vapor or field replicate samples for indoor/outdoor air samples
will be collected at a minimum of 10 percent of the total number of samples submitted. Field replicate
samples will be collocated with corresponding primary samples and collected concurrently. These
samples will be submitted blind to the project laboratory and analyzed for the same analytes.
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2.4.6 Meteorological Data
Meteorological data for this investigation will be obtained from the nearest National Weather Service
station. Data will be collected for the time corresponding to the sampling period. Data collected will
include maximum and minimum temperatures and barometric pressures, precipitation accumulation, and
a summary of hourly wind speed and direction. The meteorological data will be cross-checked with field
observations documented in the field sampling logs.
2.4.7 Laboratory Analysis
Air samples will be transferred under chain-of-custody procedures to a fixed-base Utah NEVLAP-certified
laboratory and analyzed for VOCs using EPA Method TO-15 Selected Ion Mode (SIM). Soil gas samples
will be analyzed for the same VOCs but using EPA Method TO-15 full scan. All samples will be shipped
at ambient air temperature. A list of analytes and target laboratory reporting limits for indoor/outdoor air is
provided in the following tables. Note that actual laboratory reporting limits for each sample may vary
based on the sample volume collected and sample dilution that may be required at the laboratory.
Table 2.4.7 TO-15 SIM Target Chemicals in Indoor/Outdoor Air and Reporting Limits
Chemical µg/m3
Benzene 0.160
Chloroform 0.098
cis-1,2-Dichloroethene 0.079
1,1-Dichloroethene 0.040
trans-1,2-Dichloroethene 0.400
Ethylbenzene 0.087
Naphthalene 0.260
Tetrachloroethene 0.140
Toluene 0.188
Trichloroethene 0.110
Vinyl Chloride 0.026
2.4.8 Documentation
Field notes will be maintained in an Air Sampling Log (Attachment A), and documentation for field notes
will include the following specific information.
At a minimum, the following information will be recorded in the Air Sampling Log:
• Building Identifier
• Project Name/Project Number
• Sample ID
• Sample Valve ID
• Sample Type
• Canister receipt vacuum
• Start Date
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• Start Time
• Stop Date
• Stop Time
• Weather
• Start Temperature
• Stop Temperature
• Start Barometric Pressure
• Stop Barometric Pressure
• Start Vacuum/Pressure
• Stop Vacuum/Pressure
• Sample Canister Number
• Sampler Name

In addition to the list above, interval vacuum/pressure reading for each canister may be collected and
recorded in the field notes. In accordance with laboratory requirements, the canisters cannot be written
on: sample tags will be attached to each canister as a backup for the log entries.
2.4.9 Photographs
With permission, a digital image of each sampling location will be acquired at the time of sampling. Where
photographs are allowed, a detailed photo log will be maintained throughout the project documenting, at a
minimum, the photo file name, site address identifier, sample date, and description of sample location.
2.4.10 Chain-of-Custody
Air samples collected in implementing this Work Plan will be sent to the laboratory under chain-of-custody
procedures. The chain-of-custody will include the sample identification, date and time of collection, the
sampler’s names, canister and flow controller serial numbers and initial and final vacuum readings. The
chain of custody will also include the laboratory name, address, contact phone numbers, project name,
project number, and site location. The chain of custody will be signed and dated with the time when
samples are relinquished by the sample collection team. The chain of custody will advise the laboratory to
send the analytical results to the Stantec project team.
2.4.11 Decommissioning of Soil Vapor Probes
At the conclusion of sample collection and with concurrence by UDEQ, all sub-slab probes will be
decommissioned by removal of the maximum length of tubing practicable. The resulting hole will be
patched as closely as possible to the original conditions.
2.4.12 Reporting
Following receipt of final laboratory analytical results, Stantec will validate and verify chemical data as
described in the Master QAPP and prepare a summary report for submittal to UDEQ. The report will include
the following elements.

• A description of field sampling activities.
• A scaled site plan illustrating borehole and sampling locations.
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• Tabulated summaries of analytical data screened against appropriate risk-based criteria.
• Recommendations, if appropriate; and,
• Discussion of any deviations from the procedures described in this work plan.

TABLES
TABLE 1
Sample Collection Logs
Acetone 1.25 ppbv 3 ug/m3 Benzene 0.20 ppbv 0.64 ug/m3
Allyl chloride 0.20 ppbv 0.626 ug/m3 Toluene 0.50 ppbv 1.88 ug/m3
Benzene 0.20 ppbv 0.64 ug/m3 Ethylbenzene 0.20 ppbv 0.86 ug/m3
Benzyl Chloride 0.20 ppbv 1 ug/m3 m&p-Xylene 0.40 ppbv 1.7 ug/m3
Bromodichloromethane 0.20 ppbv 1.3 ug/m3 o-Xylene 0.20 ppbv 0.87 ug/m3
Bromoform 0.60 ppbv 6.2 ug/m3 Methyl tert-butyl ether 0.20 ppbv 0.72 ug/m3
Bromomethane 0.20 ppbv 0.78 ug/m3 TPH (GC/MS) Low Fraction 200.00 ppbv 840 ug/m3
1,3-Butadiene 2.00 ppbv 4.4 ug/m3
Carbon disulfide 0.20 ppbv 0.96 ug/m3
Carbon tetrachloride 0.20 ppbv 1.3 ug/m3
Chlorobenzene 0.20 ppbv 0.92 ug/m3
Chloroethane 0.20 ppbv 0.53 ug/m3 Benzene 0.02 ppbv 0.064 ug/m3
Chloroform 0.20 ppbv 0.97 ug/m3 Carbon tetrachloride 0.02 ppbv 0.126 ug/m3
Chloromethane 0.20 ppbv 0.41 ug/m3 Chloroethane 0.04 ppbv 0.105 ug/m3
2-Chlorotoluene 0.20 ppbv 1.03 ug/m3 Chloroform 0.02 ppbv 0.097 ug/m3
Cyclohexane 0.20 ppbv 0.69 ug/m3 Chloromethane 0.03 ppbv 0.062 ug/m3
Dibromochloromethane 0.20 ppbv 1.7 ug/m3 1,2-Dibromoethane 0.02 ppbv 0.154 ug/m3
1,2-Dibromoethane 0.20 ppbv 1.5 ug/m3 1,4-Dichlorobenzene 0.02 ppbv 0.12 ug/m3
1,2-Dichlorobenzene 0.20 ppbv 1.2 ug/m3 1,1-Dichloroethane 0.02 ppbv 0.081 ug/m3
1,3-Dichlorobenzene 0.20 ppbv 1.2 ug/m3 1,2-Dichloroethane 0.02 ppbv 0.081 ug/m3
1,4-Dichlorobenzene 0.20 ppbv 1.2 ug/m3 1,1-Dichloroethene 0.02 ppbv 0.079 ug/m3
1,2-Dichloroethane 0.20 ppbv 0.81 ug/m3 cis-1,2-Dichloroethene 0.02 ppbv 0.079 ug/m3
1,1-Dichloroethane 0.20 ppbv 0.81 ug/m3 trans-1,2-Dichloroethene 0.02 ppbv 0.079 ug/m3
1,1-Dichloroethene 0.20 ppbv 0.79 ug/m3 1,2-Dichloropropane 0.03 ppbv 0.139 ug/m3
cis-1,2-Dichloroethene 0.20 ppbv 0.79 ug/m3 cis-1,3-Dichloropropene 0.02 ppbv 0.091 ug/m3
trans-1,2-Dichloroethene 0.20 ppbv 0.79 ug/m3 trans-1,3-Dichloropropene 0.03 ppbv 0.136 ug/m3
1,2-Dichloropropane 0.20 ppbv 0.92 ug/m3 Ethylbenzene 0.03 ppbv 0.13 ug/m3
cis-1,3-Dichloropropene 0.20 ppbv 0.91 ug/m3 1,1,2,2-Tetrachloroethane 0.02 ppbv 0.14 ug/m3
trans-1,3-Dichloropropene 0.20 ppbv 0.91 ug/m3 Tetrachloroethylene 0.02 ppbv 0.14 ug/m3
1,4-Dioxane 0.20 ppbv 4.5 ug/m3 1,1,1-Trichloroethane 0.02 ppbv 0.11 ug/m3
Ethanol 1.25 ppbv 2.22 ug/m3 1,1,2-Trichloroethane 0.03 ppbv 0.164 ug/m3
Ethylbenzene 0.20 ppbv 0.87 ug/m3 Trichloroethylene 0.02 ppbv 0.11 ug/m3
4-Ethyltoluene 0.20 ppbv 0.98 ug/m3 Vinyl chloride 0.02 ppbv 0.051 ug/m3
Trichlorofluoromethane 0.20 ppbv 1.12 ug/m3 Vinyl acetate 0.02 ppbv 0.07 ug/m3
Dichlorodifluoromethane 0.20 ppbv 0.99 ug/m3
1,1,2-Trichlorotrifluoroethane 0.20 ppbv 1.53 ug/m3
1,2-Dichlorotetrafluoroethane 0.20 ppbv 1.4 ug/m3
Heptane 0.20 ppbv 0.82 ug/m3
Hexachloro-1,3-butadiene 0.63 ppbv 6.7 ug/m3 Oxygen 5 %
n-Hexane 0.63 ppbv 2.24 ug/m3 Carbon Monoxide 2 %
Isopropylbenzene 0.20 ppbv 0.983 ug/m3 Carbon Dioxide 0.5 %
Methylene Chloride 0.20 ppbv 2.2 ug/m3 Methane 0.4 %
Methyl Butyl Ketone 1.25 ppbv 5.1 ug/m3
Methyl Ethyl Ketone 1.25 ppbv 3.7 ug/m3
Methyl Isobutyl Ketone 1.25 ppbv 5.1 ug/m3
Methyl methacrylate 0.20 ppbv 0.819 ug/m3
MTBE 0.20 ppbv 1.1 ug/m3 Methane 10 ppmv
Naphthalene 0.63 ppbv 3.3 ug/m3 Ethene 10 ppmv
2-Propanol 1.25 ppbv 3.1 ug/m3 Ethane 10 ppmv
Propene 1.25 ppbv 10.6 ug/m3
Styrene 0.20 ppbv 0.85 ug/m3
1,1,2,2-Tetrachloroethane 0.20 ppbv 1.4 ug/m3
Tetrachloroethylene 0.20 ppbv 1.4 ug/m3
Tetrahydrofuran 0.20 ppbv 0.59 ug/m3 Helium 0.1 %
Toluene 0.50 ppbv 1.88 ug/m3
1,2,4-Trichlorobenzene 0.63 ppbv 4.7 ug/m3
1,1,1-Trichloroethane 0.20 ppbv 1.1 ug/m3
1,1,2-Trichloroethane 0.20 ppbv 1.1 ug/m3
Trichloroethylene 0.20 ppbv 1.1 ug/m3
1,2,4-Trimethylbenzene 0.20 ppbv 1.1 ug/m3
1,3,5-Trimethylbenzene 0.20 ppbv 1.1 ug/m3
2,2,4-Trimethylpentane 0.20 ppbv 0.934 ug/m3
Vinyl chloride 0.20 ppbv 0.7 ug/m3
Vinyl Bromide 0.20 ppbv 0.78 ug/m3
Vinyl acetate 0.20 ppbv 0.51 ug/m3
m&p-Xylene 0.40 ppbv 1.7 ug/m3
o-Xylene 0.20 ppbv 0.87 ug/m3
TPH (GC/MS) Low Fraction 200.00 ppbv 840 ug/m3
Standard TO-15 (1Liter, 6Liter, or 1.4Liter)
RDL RDL
RDL RDL
TO-15SIM (6Liter)
RDLRDL
M18-MOD
RDL
Helium by Method ASTM D1946
RDL
METHANE, ETHANE, ETHENE by 8015M
RDL
Fixed Gases by method ASTM D1946
Days Hours Minutes Total Duration (min)
14 0 0 =20160
Full List Target Analytes
1,1,1-Trichloroethane
1,2-Dichloroethane
1,4-Dichlorobenzene
2-Butanone (Methyl Ethyl Ketone)
4-Methyl-2-pentanone
Benzene
Carbon Tetrachloride
Chlorobenzene
Chloroform
Cyclohexane
Ethanol
Ethyl Acetate
Ethyl Benzene
Heptane
Hexane
m,p-Xylene
Methyl tert-butyl ether
Naphthalene (non-DoD)
o-Xylene
Propylbenzene
Styrene
Tetrachloroethene
Toluene
Trichloroethene
1,2,4-Trimethylbenzene
Estimated Target Concentrations
1,1,2,2-Tetrachloroethane
1,1,2-Trichloroethane
1,1-Dichloroethane
1,1-Dichloroethene
1,2-Dichlorobenzene
1,3,5-Trimethylbenzene
1,3-Dichlorobenzene
cis-1,2-Dichloroethene
trans-1,2-Dichloroethene
Concentrations calculated with an estimated Sampling Rate will be qualified with a C-flag to indicate estimated value.
0.1653
0.2611
0.0855
0.0936
Reporting Limit (ug/m3)
0.0752
0.0827
0.0992
0.0787
0.0841
0.0800
Estimated Sampling Rate
Estimated Sampling Rate
Estimated Sampling Rate
Estimated Sampling Rate
Data Qualifier Flag
Estimated Sampling Rate
Estimated Sampling Rate
Estimated Sampling Rate
Estimated Sampling Rate
Estimated Sampling Rate
0.0813
0.0841
0.0763
0.1984
0.2544
0.0729
0.0855
0.0752
0.0709
0.0719
0.0763
TABLE 2
Radiello 130 SE Laboratory Reporting Limits
Duration
Reporting Limit (ug/m3)
0.0800
Data Qualifier Flag
0.0644
0.0973
0.1256
0.0870
0.1481
0.2480
0.0740
0.0729
0.0661
0.0919
0.4863
0.0670

FIGURES

15
269
270
201
201
154
154
68
68
89
89
89
1580
1580
80
80
215
215
Jordan River
Jordan River
2100 S
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R
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.
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R
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.
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.
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R
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0

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30
0

W
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S
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We
s
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T
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1700 S
60
0

W
1300 S
900 S
600 S
500 S500 S
900 S
Directors Row
California Ave.1300 S
2400 S
200 S
S
u
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C
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VAREX IMAGING
(formerly VARIAN
MEDICAL
SYSTEMS, INC.)
U T A HU T A HU T A H
VICINITY MAP
FIGURE 1
I:\VARIAN\VARIAN\VARIAN_JUNE2017\FIGURES\Fig 1_Varian Vicinity Map_Jun2017.ai
SITE
LOCATION
14 Oct 2017 DRAWN BY D. Severson
Document Path: J:\mxd\Fig 2_VaporIntrusionEval_2023.mxd
FIGURE 2
SITE PLAN WITHVAPOR INSTRUSION EVALUATION SAMPLE LOCATIONS
DRAWN BY C. Lee6/13/2023
APPROVED
2890 E. Cottonwood Pkwy
Salt Lake City, Utah 84121
Ph. [phone]
CHECKED KM
TF
DateBy
Coordinate System: NAD 1983 StatePlane Utah Central FIPS 4302 Feet: ESRI/ArcGIS online base map
1678 PIONEER AVENUE SALT LAKE CITY, UTAH
0 15075
Feet
PhytoremediationPlantation
SVE System
GroundwaterTreatmentSystem
Indoor Air Sample
Sub Slab Sample
2022 Injection Well
2022 Monitoring Well
Extraction Well
Injection Well
Monitoring Well
Piezometer
SVE
Staff Gauge
Trench Sump
Phytoremediation Tree
TCE Concentration 2013
Hydropunch Investigation
Extraction Trench
Slurry Trench
Asphalt Path
Concrete Pad
Existing Building Outline
EXPLANATION
J:\mxd\Fig 3_VaporIntrustionEval_2023.mxd Revised: 2023-06-13 By: cclee
APPROVED
2890 E. Cottonwood Pkwy
Salt Lake City, Utah 84121
Ph. [phone]
CHECKED KM
TF
DateBy
Coordinate System: NAD 1983 StatePlane Utah Central FIPS 4302 Feet: ESRI/ArcGIS online base map
0 2512.5
Feet FIGURE 3
WESTERN PLUME SOURCE AREA VAPORINTRUSION EVALUATION SAMPLES
1678 PIONEER AVENUE SALT LAKE CITY, UTAH
EXPLANATION
Indoor Air Sample
Sub Slab Sample
2022 Injection Point
2022 Injection Well
2022 Monitoring Well
Soil Boring Location
Injection Well
Monitoring Well
SVE
TCE Concentration
Three Existing USTs1 x 2,000 gallon DE2 x 2,000 gallon used DE

ATTACHMENT A
FIELD SAMPLING FORMS
PROJECT NAME:CLIENT:DATE:
LOCATION:SAMPLE I.D.:
SAMPLER NAME:PROJECT #:

SHUT-IN TEST:(1 inH2O = 0.073 inHg)SITE CONDITIONS (i.e. WEATHER, TRAFFIC):
PURGE:
FLOW RATE:
VAPOR SAMPLE:
FLOW RATE:
START TIME:END TIME:
TRACER USED:TRACER METER USED:
TEDLAR BAG END PURGE TRACER CONCENTRATION:
ADDITIONAL SITE NOTES:
SIGNATURE:Page
PRESSURE (inHg)TIME OF READING
INITIAL READING
FINAL READING
Stantec Consulting Services Inc.
SOIL VAPOR SAMPLING FIELD DATA SHEET
PRESSURE (inHg)TIME OF READING
INITIAL READING
FINAL READING
VAPOR SAMPLING FIELD MEASUREMENTS
TIME NOTES
VOLUME PURGED (ml)
Time (min)Shroud Concentration
(%)Time (min)Shroud Concentration
(%)Time (min)Shroud Concentration
(%)Time (min)Shroud Concentration
(%)Time (min)Shroud Concentration
(%)
0.0 6 17 28 39
1.0 8 19 30 41
0.5 7 18 29 40
2.0 10 21 32 43
1.5 9 20 31 42
3.0 12 23 34 45
2.5 11 22 33 44
37
4.0 14 25 36 47
3.5 13 24 35 46
of
49
48
5.0 16 27 38
4.5 15 26
Sample ID #Building:Date:
Barometric Pressure Start:End:
Canister #Flow Controller #Start:End:
Field Instrument PID:
Time:Canister
Pressure CO2 CO Temp RH PID BP
INDOOR/OUTDOOR AIR SAMPLE LOG
IAQ Meter:
Wind Speed/Direction:
Comments
Page 1 of 2
Sample ID #Building:Date:
INDOOR/OUTDOOR AIR SAMPLE LOG
EXCEPTIONS/ ADDITIONAL COMMENTS
Page 2 of 2

ATTACHMENT B
VAPOR PIN SOP

Standard Operating Procedure
Installation and Extraction
of the Vapor Pin®
Updated September 9, 2016

VAPOR PIN® protected under US Patent # 8,220,347 B2, US 9,291,531 B2 and other patents pending
Cox-Colvin & Associates, Inc. • 7750 Corporate Blvd., Plain City, Ohio 43064 • [phone] • VaporPin.CoxColvin.com
Scope:

This standard operating procedure describes
the installation and extraction of the VAPOR
PIN® for use in sub-slab soil-gas sampling.

Purpose:

The purpose of this procedure is to assure
good quality control in field operations and
uniformity between field personnel in the use
of the VAPOR PIN® for the collection of sub-
slab soil-gas samples or pressure readings.

Equipment Needed:

 Assembled VAPOR PIN® [VAPOR PIN® and
silicone sleeve(Figure 1)]; Because of
sharp edges, gloves are recommended for
sleeve installation;
 Hammer drill;
 5/8-inch (16mm) diameter hammer bit
(hole must be 5/8-inch (16mm) diameter
to ensure seal. It is recommended that
you use the drill guide). (Hilti™ TE-YX
5/8" x 22" (400 mm) #00206514 or
equivalent);
 1½-inch (38mm) diameter hammer bit
(Hilti™ TE-YX 1½" x 23" #00293032 or
equivalent) for flush mount applications;
 ¾-inch (19mm) diameter bottle brush;
 Wet/Dry vacuum with HEPA filter
(optional);
 VAPOR PIN® installation/extraction tool;
 Dead blow hammer;
 VAPOR PIN® flush mount cover, if
desired;
 VAPOR PIN® drilling guide, if desired;
 VAPOR PIN® protective cap; and
 VOC-free hole patching material
(hydraulic cement) and putty knife or
trowel for repairing the hole following the
extraction of the VAPOR PIN®.

Figure 1. Assembled VAPOR PIN®

Installation Procedure:

1) Check for buried obstacles (pipes,
electrical lines, etc.) prior to proceeding.

2) Set up wet/dry vacuum to collect drill
cuttings.

3) If a flush mount installation is required,
drill a 1½-inch (38mm) diameter hole at
least 1¾-inches (45mm) into the slab.
Use of a VAPOR PIN® drilling guide is
recommended.

4) Drill a 5/8-inch (16mm) diameter hole
through the slab and approximately 1-
inch (25mm) into the underlying soil to
form a void. Hole must be 5/8-inch
(16mm) in diameter to ensure seal. It is
recommended that you use the drill
guide.
Standard Operating Procedure
Installation and Removal of the Vapor Pin®
Updated September 9, 2016
Page 2

VAPOR PIN® protected under US Patent # 8,220,347 B2, US 9,291,531 B2 and other patents pending
Cox-Colvin & Associates, Inc. • 7750 Corporate Blvd., Plain City, Ohio 43064 • [phone] • VaporPin.CoxColvin.com
5) Remove the drill bit, brush the hole with
the bottle brush, and remove the loose
cuttings with the vacuum.

6) Place the lower end of VAPOR PIN®
assembly into the drilled hole. Place the
small hole located in the handle of the
installation/extraction tool over the vapor
pin to protect the barb fitting, and tap
the vapor pin into place using a dead
blow hammer (Figure 2). Make sure the
installation/extraction tool is aligned
parallel to the vapor pin to avoid
damaging the barb fitting.

Figure 2. Installing the VAPOR PIN®

During installation, the silicone sleeve will
form a slight bulge between the slab and the
VAPOR PIN® shoulder. Place the protective
cap on VAPOR PIN® to prevent vapor loss
prior to sampling (Figure 3).

Figure 3. Installed VAPOR PIN®

7) For flush mount installations, cover the
vapor pin with a flush mount cover, using
either the plastic cover or the optional
stainless-steel Secure Cover (Figure 4).

Figure 4. Secure Cover Installed

8) Allow 20 minutes or more (consult
applicable guidance for your situation)
for the sub-slab soil-gas conditions to re-
equilibrate prior to sampling.

9) Remove protective cap and connect
sample tubing to the barb fitting of the
VAPOR PIN®. This connection can be
made using a short piece of TygonTM
tubing to join the VAPOR PIN® with the
Nylaflow tubing (Figure 5). Put the
Standard Operating Procedure
Installation and Removal of the Vapor Pin®
Updated September 9, 2016
Page 3

VAPOR PIN® protected under US Patent # 8,220,347 B2, US 9,291,531 B2 and other patents pending
Cox-Colvin & Associates, Inc. • 7750 Corporate Blvd., Plain City, Ohio 43064 • [phone] • VaporPin.CoxColvin.com
Nylaflow tubing as close to the VAPOR
PIN® as possible to minimize contact
between soil gas and TygonTM tubing.

Figure 5. VAPOR PIN® sample connection

10) Conduct leak tests in accordance with
applicable guidance. If the method of
leak testing is not specified, an alternative
can be the use of a water dam and
vacuum pump, as described in SOP Leak
Testing the VAPOR PIN® via Mechanical
Means (Figure 6). For flush-mount
installations, distilled water can be
poured directly into the 1 1/2 inch
(38mm) hole.

Figure 6. Water dam used for leak detection

11) Collect sub-slab soil gas sample or
pressure reading. When finished, replace
the protective cap and flush mount cover
until the next event. If the sampling is
complete, extract the VAPOR PIN®.

Extraction Procedure:

1) Remove the protective cap, and thread
the installation/extraction tool onto the
barrel of the VAPOR PIN® (Figure 7).
Turn the tool clockwise continuously,
don't stop turning, the VAPOR PIN® will
feed into the bottom of the
installation/extraction tool and will
extract from the hole like a wine cork, DO
NOT PULL.

2) Fill the void with hydraulic cement and
smooth with a trowel or putty knife.
Figure 7. Removing the VAPOR PIN®

 Prior to reuse, remove the silicone
sleeve and protective cap and discard.
Decontaminate the VAPOR PIN® in a
hot water and Alconox® wash, then
heat in an oven to a temperature of
265o F (130o C) for 15 to 30 minutes.
For both steps, STAINLESS – ½ hour,
BRASS 8 minutes
3) Replacement parts and supplies are
available online.

ATTACHMENT C
BUILDING SURVEY FORM

Page 1 of 7

INDOOR AIR QUALITY BUILDING SURVEY

This form must be completed for each building involved in an indoor air investigation.

Preparer’s Name: Date Prepared:
Preparer’s Affiliation: Stantec Consulting Services, Inc.
Telephone Number:

OCCUPANT INFORMATION
Name
Address
City, State ZIP
Home Telephone
Office Telephone

OWNER or LANDLORD INFORMATION
Name
(if different from Occupant)

Address
City, State ZIP
Telephone

A. Building Construction

1. Type (check appropriate responses): □ Single Level
□ Split Level
□ Mobile Home
□ Duplex
□ Triplex
□ Office
□ Warehouse
□ Strip Mall
□ Apartment Building: # of Units:
□ Other:

2. Building Age: Number of Floors:

3. Area of the Building (square feet):

Page 2 of 7

4. Is the building insulated? □ YES □ NO

5. How sealed is the building?
6. Roll-up Doors Present? (Y / N) Normally Open? (Y / N)
7. Number of elevators in the building:
8. Condition of the elevator pits (sealed, open earth, etc.)
9. General description of building construction materials:

B. Foundation Characteristics (check all that apply)
1. □ Full basement □ Crawlspace □ Slab on Grade-

Post Tension Slab? _________ □ Other:

Were foundation design specifications and as-built drawings for the facility
obtained? (Y / N)
Was soil beneath the floor slab treated with lime before placing the slab? (Y / N)
Were fibers or additional rebar added to the concrete floor to minimize cracking?
(Y / N)
Was a vapor barrier installed under the floor slab? (Y / N)
Describe:_________________________________________________________
Were any other liners installed under the floor slab? (Y / N)
Describe:_________________________________________________________
2. Basement Floor Description: □ Concrete □ Dirt □ Wood
□ Other:
a) Basement is: □ Wet □ Dry □ Damp
b) Sump present? □ YES □ NO Water in sump? □ YES □ NO
c) Basement is: □ Finished □ Unfinished □ Other:
d) Is basement sealed? □ YES □ NO
Provide a description:

Page 3 of 7

3. Concrete floor description: □ Unsealed □ Painted □ Covered
with:
4. Foundation walls: □ Poured Concrete □ Block □ Stone
□ Wood □ Other:

C. Identify all potential soil gas entry points and their size (e.g., cracks, voids, pipes,
utility ports, sumps, drain holes, etc.). Include these points on the building diagram. D. Heating, Ventilation, and Air Conditioning (check all that apply)
1. Type of heating system(s): □ Hot Air Circulation
□ Hot Water Radiation
□ Steam Radiation
□ Electric Baseboard
□ Heat Pump
□ Unvented Kerosene Heater
□ Wood Stove
□ Other (specify):
2. Type of fuel used: □ Natural Gas
□ Fuel Oil
□ Electric
□ Wood
□ Coal
□ Solar
□ Other:
3. Location of heating system:
4. Is there air conditioning? □ YES □ NO
If YES: □ Central Air □ Window Units
Specify location:
5. Are there air distribution ducts present? □ YES □ NO
6. Describe the supply and cold air return duct work including whether there is a
cold air return and comment on the tightness of duct joints:
____________________________________
7. Is there a whole house fan? □ YES □ NO
What is the size of the fan?
8. Temperature settings inside during sampling (note day and night temperatures).
a. Daytime Temperature(s)
b. Nighttime Temperature(s)
(Note times if system cycles during non-occupied hours during the day.)

Page 4 of 7

9. Estimate the average time doors and windows are open to allow fresh outside air
into the building. Note rooms that frequently have open windows or doors:

D. Potential Indoor Sources of Pollution

1. Is the laundry room located inside the building? □ YES □ NO
2. Has the building ever had a fire? □ YES □ NO
3. Is there an attached garage? □ YES □ NO
4. Is a vehicle normally parked in the garage? □ YES □ NO
5. Is there a kerosene heater present? □ YES □ NO
6. Is there a workshop, hobby or craft area in the building? □ YES □ NO
7. An inventory of all products used or stored in the building should be performed.
Any products that contain volatile organic compounds or chemicals similar to the
target compounds should be listed. The attached Products Inventory Form
(see page 7) should be used for this purpose.
8. Is there a kitchen exhaust fan? □ YES □ NO
Where is it vented?
9. Is the stove: □ Gas □ Electric Is the oven: □ Gas □ Electric
10. Is there an automatic dishwasher? □ YES □ NO
11. Is smoking allowed in the building? □ YES □ NO
12. Has the building ever been fumigated or sprayed for pests? □ YES □ NO
If YES, give date, type and location of treatment:

E. Water and Sewage

1. Source of Water (check appropriate response) □ Public Water
□ Drilled Well
□ Driven Well
□ Dug Well
□ Other (specify):

2. Water Well Specifications

Well Diameter
Well Depth
Depth to Bedrock
Feet of Casing
Grouted or Ungrouted _____
Type of Storage Tank
Size of Storage Tank

Page 5 of 7

Describe type(s) of Treatment:

3. Water Quality
Taste and/or odor problems with water? □ YES □ NO
If YES, describe:
Is the water chlorinated, brominated, or ozonated? □ YES □ NO
How long has the taste and/or odor problem been present?

4. Sewage Disposal □ Public Sewer
□ Septic Tank
□ Leach Field
□ Other (specify):

Distance from well to septic system:
Type of septic tank additives:

F. Plan View

Sketch each floor and if applicable, indicate air sampling locations, possible indoor air
pollution sources, preferential pathways and field instrument readings.

G. Potential Outdoor Sources of Pollution

Draw a diagram of the area surrounding the building being sampled. If applicable,
provide information on the spill locations (if known), potential air contamination sources
(industries, service stations, repair shops, retail shops, landfills, etc.), outdoor air
sampling locations, and field instrument readings.

Also, on the diagram, indicate barometric pressure, weather conditions, ambient and
indoor temperatures, compass direction, wind direction and speed during sampling, the
locations of the water wells, septic systems, and utility corridors if applicable, and a
statement to help locate the site on a topographical map.

H. Date of last painting of surfaces at the facility: __________________________

Location where painting occurred:____________________________________

I. Date of last carpet replacement: __________________________________

Location(s): ________________________________________
________________________________________

Was glue used to attach carpeting to floor slab?__________________________

I. Describe Process/Manufacturing/Storage Areas: _________________________

Page 6 of 7

J. Existing Soil Vapor Control Devices (pipes, vents, blowers, HVAC Add-ons)

K. Describe Observations, Locations: ____________________________________
________________________________________________________________

L. Wall Surfaces (painted, textured)______________________________________

M. Noted Interior Sinks for VOCs____________________________________

Page 7 of 7

PRODUCTS INVENTORY FORM

Occupant of Building:_________________________________________________

Address:___________________________________________________________

Field Investigator:_______________________________Date:_________________

Product Description
(Commercial name, dispenser type,
container size, manufacturer)
VOCs Contained in
Product
Field Instrument
Reading

Comments:____________________________________________________________

________________________________________________________________