DERR-2024-005664

State of Utah
SPENCER J. COX
Governor
DEIDRE HENDERSON
Lieutenant Governor
Craig Eaton
Department of
Environmental Quality
Kimberly D. Shelley
Executive Director
DIVISION OF ENVIRONMENTAL
RESPONSE AND REMEDIATION
Brent H. Everett
Director
February 29, 2024
Terracon Consultants, Inc.
6949 South High Tech Drive, Suite 100
Midvale, Utah 8404 7
ERRL-0084-24
Re: Work Assignment GZQ-58-TER, Preparation of a Work Plan and Price for a
Continued Indoor Air Vapor Study with Reporting
Former Brent Redd Property, located at 148 East Center Street, Monticello, Utah
Facility Identification No. 5000003, Release Site GZQ
Dear Mr. Eaton:
The Division of Environmental Response and Remediation (DERR), requests that Terracon
Consultants, Inc. (Terracon) complete the enclosed work assignment, under Contract #216383. The
work assignment is to produce a work plan and price for an indoor air vapor study.
Enclosed is an original copy of the work assignment and tasks to be completed. Please sign
and return electronically to the DERR.
If you have any questions concerning this work assignment, please contact Mark Crim, the
DERR Project Manager, at [phone].
MPAIMEC/rr
Enclosure( s)
Sincerely,
Morgan P. Atkinson, PST Branch Manager
Division of Environmental Response and Remediation
cc: Thomas Kingston, Division of Environmental Response and Remediation
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 I 00% recycled paper
WORK ASSIGNMENT GZQ-58-TER
Contract#: 216383
Work Assignment: Preparation of a Work Plan and Price for a Continued Indoor Air Vapor
Study with Reporting
Former Brent Redd Property
Located at 148 East Center Street, Monticello, Utah
Facility Identification No. 5000003, Release Site GZQ
The Consultant, Terracon, is requested to complete the following work assignment.
I. WORK OBJECTIVE
A program of groundwater monitoring and other remedial actions have occurred at the site
since 1996. In an effort to better evaluate impacts from the in-place petroleum
contamination, the DERR initiated an indoor air vapor study at the Brent Redd site and the
Monticello Inn, a third-party structure overlying the dissolved-phase plume migrating from
the Brent Redd release site. The indoor air study by the DERR, November 2023, indicated
that ambient air benzene concentrations in the Monticello Inn were above DERR established
levels. The DERR wishes to continue additional air studies to establish a data set for
decision-making.
The work objective is to hold a project scoping meeting with the DERR project manager,
and to prepare a work plan and price for three quarterly air sampling events at the Brent
Redd site and the Monticello Inn. Each event shall occur in conjunction with or near the
scheduled quarterly groundwater monitoring events, of DERR-approved Work Assignment
GZQ-57, and include the placement, sampling and analyses of six Summa TM canisters, and
the sampling and analyses of two, sub-slab vapor monitoring points (VMP), VP-land VP-
2, and project reporting. The work plan price should provide an estimate of costs for the
implementation of the work plan, itemized per task. Each stage of the work plan should be
identified as a specific task or sub-task. Work performed under each task or sub-task shall
not commence without prior approval from the DERR.
II. TASKS
The DERR has identified the following tasks:
A. Attend a project scoping meeting with the DERR project manager.
B. After the DERR meeting, provide a work plan and price for the following work at
the Brent Redd site and the Monticello Inn:
1. At the Monticello Inn place five, 6-liter capacity SummaTM canisters, with
three to be placed in the ground-level living quarters, and two to be placed in
the crawl space beneath the structure. The manner of placement and locations
shall be the same as the November 2023 work, if possible. Additionally, place
a 6-liter capacity SummaTM canister outside of the Monticello Inn, near the
north side of the building for testing. Collect 24-hour air samples and have
the samples evaluated for VOCs and MBTEXN using Method TO-15.
2. At the Brent Redd site and the Monticello Inn, sample installed VMPs,
VP-1 and VP-2. Collect 5-minute air samples from each VMP, using a 1-liter
capacity SummaTM canister, and have the samples evaluated for VOCs and
MBTEXN using Method TO-15.
3. Provide a report of findings. Requested information shall include a
discussion of the vapor monitoring program to date, including historic vapor
monitoring results. Recordation of the barometric pressure and dewpoint of
the test dates for Monticello, SummaTM canister placement and sampling
techniques, VPM sampling techniques, renderings of the buildings' layouts
and sample collection points. Report the vapor sampling results compared to
the DERR Sub-Slab Commercial Risk Based Screening Levels for the
service station building, and the DERR Sub-Slab Residential Risk Based
Screening Levels for the Monticello Inn.
Cost: $1,000.00
III. PRICE AND PAYMENT SCHEDULE
A. The expense to the DERR for completing this work assignment shall not exceed
$1,000.00, including administrative costs, contract management, project
management, and other associated costs.
B. Payment requests shall be submitted when tasks are completed, as outlined in the
attached Deliverable and Payment Schedule.
IV. SCHEDULE FOR COMPLETION OF WORK AND REPORTING
REQUIREMENTS
A. The DERR has set a deadline of March 14, 2024 for Terracon to attend a project
scoping meeting.
B. Terracon shall submit a work plan and price for Task B, by April 5, 2024. Terracon
will provide a final work plan and price within 4 days of receipt of any DERR
comments.
Approved by:
DERR Project Manager:
DERR Contract Officer:
LUST Section Manager:
Consultant:
Date: 02/29/2024
Date: 02/29/2024
Date: 03/01/2024
Date: 03/05/2024
DELIVERABLE AND PAYMENT SCHEDULE
Deliverable/
Task No.
A-B
Work Assignment: GZQ-58-TER
Description
Meeting and Work Plan and Price for
Vapor Study with Report
Due Date
April 2024
Price
$1,000.00
Work Assignment Total: $1,000.00