DERR-2024-004600

Arcadis U.S., Inc.
530 B Street
Suite 1000
San Diego
California 92101
Phone: [phone]
www.arcadis.com

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Mr. Mark Crim
Utah Department of Environmental Quality
Division of Environmental Response and Remediation
195 North 1950 West
Salt Lake City, Utah 84116

Date: December 20, 2023
Our Ref: 30063821
Subject: Post-Corrective Action Soil Sampling Work Plan
Former Texaco Station No. 301661
974 North 900 West
Salt Lake City, Utah
Utah DERR Facility ID No. 4002279
Release Site LIH

Dear Mr. Crim:
On behalf of Chevron Environmental Management Company (CEMC), Arcadis U.S., Inc. (Arcadis) has prepared
this Post-Corrective Action Soil Sampling Work Plan (Work Plan) for the Former Texaco Station No. 30-1661
located at 974 North 900 West, Salt Lake City, Utah (Figure 1). This Work Plan was prepared to summarize
proposed post-corrective action performance confirmation sampling as requested in the October 5, 2023
correspondence (Attachment A) from the Utah Department of Environmental Quality, Division of Environmental
Response and Remediation (DERR; Directive). DERR has requested additional investigation work to support
closure of the environmental case at the site: DERR Facility Identification 4002279, Release Site LIH.
Proposed Scope of Work
During the excavation activities and installation of the remedial trenches, performed on November 3, 2021,
sidewall samples were collected as depicted on Figure 2. Four confirmation soil samples will be collected in the
vicinity and at the same depth of the pre-remedy locations and the results will be compared to help evaluate
remedy effectiveness. The soil borings will be advanced and sampled in accordance with the Utah Groundwater
and Soil Sampling Study Guide (Utah Department of Environmental Quality [UDEQ] 2013), and the soil borings
will be advanced by a licensed Utah well driller. Due to the shallow terminal depth of the borings (5 to 7 feet below
ground surface [bgs]), soil borings will be advanced using hand auger techniques. The table below presents the
rational for each confirmation boring.
Table 1: Proposed Confirmation Soil Samples
Location Depth Rationale
T-W-N-6_P 6 feet Confirmation boring of T-W-N-6
T-W-S-5_P 5 feet Confirmation boring of T-W-S-5
T-C-N-6_P 6 feet Confirmation boring from T-C-N-6
T-E-S-7_P 7 feet Confirmation boring from T-E-S-7
Mr. Mark Crim
Utah DERR
December 20, 2023

www.arcadis.com 2/3
Soil Sampling
Soils will be logged for lithologic properties including soil type, color, and moisture content in accordance with the
Unified Soil Classification System (American Society for Testing and Materials D2488) or modified Udden
Wentworth. In addition, any observed staining and relative volatile organic compound (VOC) concentrations as
measured with a photoionization detector (PID) will be noted on the boring log. Retrieved soils will be logged by
experienced field personnel, under supervision from a Utah underground storage tank (UST)-certified sampler.
Four soil samples plus one duplicate sample will be collected for analytical testing from similar locations (Figure 2)
and depths as the baseline samples. Based on historical groundwater elevations at the site (2 to 6 feet bgs),
these samples are expected to be collected within the saturated zone. The surface of each boring will be
completed to match existing conditions.
Laboratory Analyses and Sample Handling
Soil samples collected for laboratory analytical testing will be completed by a Utah Environmental Laboratory
Certification Program (ELCP)-certified laboratory (Pace Analytical). Samples will be analyzed for the following:
 Total Solids by United States Environmental Protection Agency (USEPA) Method 2540 G-2011
 Total Petroleum Hydrocarbon (TPH)-Gasoline Range Organics (GRO) by USEPA Method 8015D;
 TPH-Diesel Range Organics (DRO) by USEPA Method 8015;
 Sulfate by USEPA Method 9056A;
 Iron by USEPA Method 6010B; and
 Benzene, toluene, ethylbenzene, xylenes, methyl tert-butyl ether (MTBE) and naphthalene (BTEXMN) by
USEPA Method 8260B.
Soil samples for laboratory analysis will be collected using methods to minimize the loss of VOCs. Soil samples
will be stored on ice in coolers and transported to the ELCP-certified laboratory under proper chain-of-custody
procedures. Downhole sampling equipment will be washed in an Alconox® solution and rinsed with distilled water
between samples.
Waste Handling
Investigation-derived waste generated during drilling operations will be containerized in United States Department
of Transportation-approved 55-gallon drums and temporarily stored on site pending characterization. Arcadis will
manage the waste profile and arrange for a certified waste contractor to transport and dispose of the waste.
Reporting
A report will be submitted to DERR within 60 days of receiving initial analytical results.

If you have any questions regarding the status of activities at this site, please feel free to contact me at
858.987.4383 or by email at [e-mail].

Mr. Mark Crim
Utah DERR
December 20, 2023

www.arcadis.com 3/3
Sincerely,
Arcadis U.S., Inc.

Taura Nichols, P.E.
UST Certified Consultant, CC 0247

Carissa Mason
Certified Project Manager

Email: [e-mail]
Direct Line: 858.987.4383

CC. John Amato, CEMC

References:
UDEQ. 2013. Utah Groundwater and Soil Sampling Study Guide. June.

Enclosures:
Figure 1. Site Location Map
Figure 2. Proposed Post-Corrective Action Soil Sample Locations
Attachment A. Correspondence dated October 5, 2023 from Utah DERR DEQ

PROJECT
LOCATION
SITE LOCATION MAP
REFERENCE: BASE MAP USGS 7.5 MINUTE QUADRANGLE,
SALT LAKE CITY NORTH, UT, JAN. 31, 2020.FORMER TEXACO STATION NO. 30-1661
974 NORTH 900 WEST, SALT LAKE CITY, UTAH
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TAX ID# 08-26-409-013-0000
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(LOT SIZE: 0.37 ACRES)
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FORMER TEXACO STATION NO. 30-1661 974 NORTH 900 WEST, SALT LAKE CITY, UTAH
PROPOSED POST-CORRECTIVE ACTION
SOIL SAMPLE LOCATIONS
N
PREVIOUSLY TOPOGRAPHIC CONTOUR
(1-ft INTERVAL)
EXISTING FENCE
EXISTING NATURAL GAS
EXISTING UNDERGROUND ELECTRIC
EXISTING WATERLINE
EXISTING OVERHEAD ELECTRIC LINE
EXISTING DATA/COMMUNICATION
EXISTING MONITORING WELL
EXISTING ELECTRICAL BOX
EXISTING WATER METER
EXISTING ASPHALT
EXISTING INLET
EXISTING UTILITY POLE
SOIL BORING LOCATION (2021)
PROPERTY BOUNDARY (APPROXIMATE)
LIMITS OF TRENCH EXCAVATION
PROPOSED POST-CORRECTIVE ACTION
SOIL SAMPLE LOCATION
OHE
MWTEX8
NOTE:
1.ADDITIONAL SITE FEATURES (NOT SHOWN) MAY
EXIST, ALL RELEVANT SITE FEATURES/CONDITIONS
WERE FIELD VERIFIED/IDENTIFIED/LOCATED BY THE
CONTRACTOR PRIOR TO THE START OF
CONSTRUCTION.
COM
T-E-S-7
T-W-N-6_P
GRAPHIC SCALE
10'20'0

195 North 1950 West • Salt Lake City, UT
Mailing Address: P.O. Box 144840 • Salt Lake City, UT 84114-4840
Telephone [phone] • Fax [phone] • T.D.D. [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
ERRA-18-23 October 5, 2023 SENT VIA U.S. REGULAR AND CERTIFIED MAIL RETURN RECEIPT REQUESTED John Amoto, Project Manager Chevron Environmental Management Company 6001 Bollinger Canyon Road, C2092 San Ramon, California 94583 Re: No Further Action Review Former Wayne’s Rose Park Texaco, located at 974 North 900 West, Salt Lake City, Utah Facility Identification No. 4002279, Release Site LIH Dear Mr. Amoto: The Division of Environmental Response and Remediation (DERR) completed its review of site conditions and the request for No Further Action (NFA) status at the above-referenced facility on August 8, 2023. The review indicates that in-place soil and groundwater contamination remains and exceeds the DERR’s Initial Screening Level (ISL) cleanup standard. Conclusions drawn from the DERR review are: 1. Soil contamination above the ISL remains for benzene, toluene, ethylbenzene, xylenes, total petroleum hydrocarbons, diesel range organics (TPH-DRO) and total petroleum hydrocarbons, gasoline range organics (TPH-GRO). The contamination is primarily found at the former underground storage tank and dispenser areas, i.e., sampling locations MWTEX-12, T-W-N-6, T-C-N-6, T-E-S-7, GPTEX-3, SB-2, GPTEX-4, MWTEX-4 GPTEX-2, SB-1, T-W-S-5, and several outlier locations such as HA-15, HA-18, HA-22, and HA-27. Collected data indicates the petroleum-impacted soil is from about 4’-7’ below grade (bg) (see enclosed Figure 6, Approximate Remaining Soil and Groundwater >ISL Map, DERR, 2023).
2. Dissolved-phase petroleum-impacted groundwater above the ISL remains for benzene and or TPH-GRO, in monitoring wells (MW) MW-10, MWTEX-4, MWTEX-11 and MWTEX-12. The depth to groundwater is about 3-5’ bg (see enclosed Figure 6, Approximate Remaining Soil and Groundwater >ISL Map, DERR, 2023).

Facility ID# 4002279
Page 2

3. The area impacted with soil and groundwater contamination is on third party land. According to the Salt Lake County Recorder’s Office, the former Wayne’s Rose Park Texaco is on Parcel 08-26-409-013-0000, and owned by Salt Lake City Corporation (see enclosed Salt Lake County Assessor’s Parcel Details and Parcel Viewer documents). Therefore, the following must be completed before NFA can be considered: 1. Submit a plan to the DERR for post-corrective action soil sampling in accordance with Utah Admin. Code R311-211 and R311-202, for DERR review and approval, and 2. Due to the presence of petroleum contamination proposed to be left in place, Chevron Environmental Management Company (CEMC) will need to approach the owner of parcel 08-26-409-013-0000 about voluntarily entering into an Environmental Covenant (EC) with the DERR, in compliance with the Utah Uniform Environmental Covenants Act, Utah Code Section 57-25-101, et seq. The EC must then be recorded with the Salt Lake County Recorder’s Office. The EC will identify the remaining contamination and contain “activity and use limitation” provisions to protect the owner, workers and the public from exposure to the remaining petroleum contamination. The DERR may assist in the effort of drafting an acceptable EC by providing a draft EC and guiding the parties through the process. The owner of parcel 08-26-409-013-0000 may choose to reject the EC process. If the EC is rejected, the director may require CEMC to complete additional corrective action. According to Utah Code R311-202 and R311-211, the DERR requires that Chevron Environmental Management Company provide a post-corrective action soil sampling plan within 120 days of receipt of this letter. If you have any questions concerning this letter, please contact Mark Crim, the DERR project manager, at [phone]. Sincerely, Brent H. Everett, Director Division of Environmental Response and Remediation BHE/MEC/ss cc: Angela Dunn, MD, MPH, Executive Director, Salt Lake County Health Department Kimberlee McEwan, Utah Attorney General’s Office Tyler Murdock, Deputy Director, Salt Lake City Public Lands Toby Hazelbaker, Salt Lake City Public Lands Carmen Baily, Salt Lake City Public Lands Kyle Shields, Salt Lake City Public Lands Taura Nichols, P.E., CC-0247, Arcadis U.S., Inc. Patrick Juancorena, U.S. Environmental Protection Agency, Region 8