DSHW-2018-003275 - 0901a068807eab48

5R14000(,
Div of Waste Managment
=Ind Radiation Control
.4.016. WASATCH APR 9 2018
ENVIRONMENTAL
Mr. Ryan Heath
Cottonwood Residential
6340 South 3000 East, Suite 500
Cottonwood Heights, Utah 84121
and
Mr. Silas Campbell, LEED® AP
General Services Administration
Public Buildings Service
Denver Federal Center, Building 41
Denver, Colorado, 80225
April 5, 2018
Project No.: 2201-001E
DSI-N-2,01(5 - 00327E)
SUBJECT: Subsurface Features and Soil Removal, Investigation, and Confirmation Sampling Report
Former GSA Motor Pool Property
330 East 200 South
Salt Lake City, Utah
INTRODUCTION
On behalf of Cottonwood Residential and the General Service Administration (GSA), Wasatch
Environmental, Inc., (Wasatch) has prepared the following Subsurface Features and Soil Removal, and
Investigation Report for the former GSA Motor Pool property, located at 330 East 200 South in Salt Lake
City, Utah (site). Cottonwood Residential is under contract to purchase the site from the GSA. The
underground features were removed in two separate events. During the first event on October 3 through
October 6, 2017, E.T. Technologies removed six underground vehicle hoists.
On February 7 through 13, 2018 during the demolition of the Former GSA Motor Pool building by Nelson
Brothers, E.T. Technologies/Nelson Brothers removed the additional underground features, including the
abandoned in place underground storage tank (UST), two oil water separators (OWS) and a trench drain.
Three areas associated with former fueling operations were further investigated, including the North Fuel
Island, the South Fuel Island, and the location of the former 10,000-gallon UST referred to as the South
Tank Pit. These features are shown on Figures 1 and 2.
BACKGROUND
Many environmental investigations have been conducted on the site by Wasatch and others. Wasatch
reviewed a Phase I Environmental Site Assessment (ESA) for the site, dated March 19, 2013, prepared
for GSA by ERO Resources Corporation. Additionally, Wasatch reviewed a Limited Subsurface Soil and
Groundwater Assessment, dated September 21, 2016, prepared by Gordon Geotechnical Engineering,
Inc., for Cottonwood Residential. Wasatch also reviewed a Phase I ESA, dated August 24, 2016,
prepared for Cottonwood Residential by Partner Engineering and Science for the east adjoining Big Lots
property. Prior reports document the presence of a former dry cleaner on the east adjoining property, and
the Gordon Geotechnical reports confirm the presence of the dry cleaning related contaminants on the
subject property.
Wasatch conducted a Limited Site Investigation in November and December 2016, which included the
installation of monitoring wells, collection of sub-slab vapor samples, a ground penetrating radar survey,
direct push soil sampling, and direct-push groundwater sampling. The report titled Monitoring Well
Installation and Subsurface Investigation Report, dated January 17, 2017 was submitted to the Utah
2410 WEST CALIFORNIA AVENUE • SALT LAKE CITY, UTAH 84104 PHONE [phone] • FAX [phone]
Website: wwwwasatch-environmentaLcom • e-Mail: wei@wasatch-environmentaLcom