DERR-2024-012563

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
ERRL-0476-24
November 26, 2024

CERTIFIED MAIL
RETURN RECEIPT REQUESTED
John Amato
Chevron Environmental Management and Real Estate Company
324 West Segundo Boulevard (MO-142)
El Segundo, California 90245
Re:Additional Sampling Requirements
Chevron #71887, located at 2003 South Washington Boulevard, Ogden, Utah
Facility Identification No. 1200035, Release FME
Dear Mr. Amato:

On November 4, 2024, the Division of Environmental Response and Remediation (DERR)
received a Second Half 2024 Groundwater Monitoring Report for the above-referenced site. After
reviewing this information, the DERR project manager recommends further groundwater
monitoring. During petroleum storage tank (PST) monitoring activities on September 4, 2024,
groundwater samples indicate Benzene, TPH-GRO, and TPH-DRO concentrations remain above
State-established applicable standards.

For a site to be eligible for closure, two consecutive rounds of groundwater monitoring must
show petroleum contamination below state-established clean-up standards. Since contamination is
located off-site, specifically in MW-23 and MW-24, the contamination must be below the Initial
Screening Levels (ISLs) in these wells.

The DERR project manager recommends at least two additional groundwater monitoring
events, six months apart, to assess the remaining subsurface contamination. Environmental samples
for METEXN, gasoline, and diesel must be analyzed using the methods indicated in the enclosed
Analytical Methods for Environmental Sampling. Silica gel treatment should be included as part of
the TPH-DRO analysis for MW-4 and MW-24.
All environmental samples must be collected by a Utah-certified groundwater and soil
sampler following the sampling protocol outlined in Utah Admin. Code R311-205. The report
Facility ID# 1200035
Page 2
associated with these requirements must be submitted to our office within 180 days of receiving
this letter.
If you have any questions regarding this matter, please contact Liberty Coe, the DERR
project manager, at [phone].
Sincerely,

Brent H. Everett, Director
Division of Environmental Response and Remediation

BHE/LC/rr

Enclosure: Table of Analytical Methods for Sampling

cc: Brian Cowan, B.S., M.P.H., Director, Weber-Morgan Health Department
Scott Braeden, Environmental Health Director, Weber-Morgan Health Department
Gerald A. Robinson, Project Manager, Arcadis U.S., Inc.
t:
~ ~
J

Analytical Methods for Environmental Sampling at
Petroleum Storage Tank Sites in Utah
(September 2022)

Substance or
Product Type
Contaminant Compounds to be Analyzed for Each
Substance or Product Type
ANALYTICAL METHODS1
Soil, Groundwater
or Surface Water

Gasoline
Total Petroleum Hydrocarbons (purgeable TPH as gasoline
range organics C6 - C10)
EPA 8015 or EPA 8260
Benzene, Toluene, Ethyl benzene, Xylenes, Naphthalene,
(BT EXN) and MTBE
EPA 8021 or EPA 8260

Diesel
Total Petroleum Hydrocarbons (extractable TPH as diesel
range organics C10 – C28)
EPA 8015
Benzene, Toluene, Ethyl benzene, Xylenes, and Naphthalene
(BT EXN)
EPA 8021 or EPA 8260
Used Oil
Oil and Grease (O&G) or
Total Recoverable Petroleum Hydrocarbons (T RPH)
EPA 1664 or
EPA 1664 (SGT*)
Benzene, Toluene, Ethyl benzene, Xylenes, Naphthalene
(BT EXN) & MTBE; and Halogenated Volatile Organic
Compounds (VOX)
EPA 8021 or EPA 8260
New Oil Oil and Grease (O&G) or
Total Recoverable Petroleum Hydrocarbons (T RPH)
EPA 1664 or
EPA 1664 (SGT*)
Other Type of analyses will be based upon the substance or product
stored, and as approved by the DERR Division Director
Method will be based upon the
substance or product type
Unknown
Total Petroleum Hydrocarbons (purgeable TPH as gasoline
range organics C6 - C10)
EPA 8015 or EPA 8260
Total Petroleum Hydrocarbons (extractable TPH as diesel
range organics C10 – C28)
EPA 8015
Oil and Grease (O&G) or
Total Recoverable Petroleum Hydrocarbons (T RPH)
EPA 1664 or
EPA 1664 (SGT*)
Benzene, Toluene, Ethyl benzene, Xylenes, and Naphthalene
(BT EXN) and MT BE; and Halogenated Volatile Organic
Compounds (VOX)
EPA 8021 or EPA 8260

1 The following modifications to these certified methods are considered acceptable by the DERR Division Director:
• Dual column confirmation may n ot be required for TP H and BTEXN/MTBE analysis.
• A micro-extraction or scale-down technique may be used for aqueous samples, but only for the
determination of extractable TP H as diesel range organics (C10 – C28).
• Hexane may be used as an extraction solvent.
• *Silica Gel Treatment (SGT) may be used in the determination of Total Recoverable P etroleum Hydrocarbons.
NOTE: The sample preparation method and any modification(s) to a certified method must be reported by the laboratory.