DSHW-2024-004974

Gralrt, a^al ra.lrLf,,7vT'Il,o
March 4, 1998
Rob Powers
Utah Division of Solid and Hazardous Waste
288North 1460 West
P.O. Box 144880
salt Lake city, Utah 84114
Re: Site lnvestigation
Laundry Supply Company
Salt Lake Clty, Lnah
Olympus Work Order # 7585
Dear Mr. Powers:
Olympus Environmental, lnc. (Olympus) has been contracted to perform a site investigation at
Laundry Supply Company's (LSC) facility located at 3785 West 1987 South in Salt Lake City,
Utah (Facility). The purpose of the investigation is to determine the nature and extent of
subsurface halogenated volatile organic (HVO) compound contamination at the Facility.
BACKGROUND INFORMANON
During the decommissioning of a tetrachloroethene (perchloroethylene or PCE, an HVO
compound) underground storage tank (UST) system, LSC determined that a subsurface
release of an unknoun quantity of PCE had likely occuned. Analyses of soiland ground water
samples collected at the time of decommissioning detected PCE at concentrations that the
State of Utah requires an environmental site investigation. LSC and the Utah Division of Solid
and Hazardous Waste subsequently entered into a Stipulation and Consent Agreement. The
Stipulation and Consent Agreement requires LSC to pedorm a site investigation to determine if
residue, contaminated soil, watel or other material resulting from the PCE release poses a
hazard to human health or the environment.
JBR EnvironmentalConsultants, lnc. of Sandy, Utah, on behalf of LSC, prepared a Sffe
lnvestigation l%n (SlP) dated November 10, 1997. The Division of Solid and Hazardous
Waste approved the SIP on December 23,1997. Olympus has revieured the SlP, and on
behalf of LSC, requests that the Division of Solid and Hazardous Waste approve the folloring
proposed assessment as a change to the SlP. We are proposing a phased approach that will
more cost effectively assess HVO contamination at the Facility.
D:\LSC.7s6s\DEe 3.4 RA.doc Environmental & Hazardous Waste Seruices
Auburn, WA Billings, MT Boise, lD Helena, MT Portland, OR Spokane, WA
Bt09 KendallStreet o Boise, tdaho g9706. (208) gZ6_5006
Utah Division of Solid and 'l"ous Waste
March 4, 1998
Page 2
PROPOSED ASSESSMENT
Knowing that soiland ground water has been adversely impacted (based upon sampling and
analyses performed during the UST decommissioning), Olympus proposes limiting the initial
assessment to six soil borings with ground water monitoring well completions in three of the
borings. Our past experience has shown that HVO soilcontamination is typically limited to an
area immediately beneath and in close proximity to a leaking UST system. Based upon this
typical site condition, we will locate the proposed soil borings as follows:
. one boring in the center (or as close as possible to) of the UST basin (to better define
subsurface HVO concentrations in tank basin soil);o four soi! borings within five feet of the decommissioned UST basin ( to determine lateral
extent of HVO contaminant migration in soil); and. one boring outside of the UST basin (to evaluate background conditions).
Layne Christensen Company (Layne) of Salt Lake City, Utah willadvance the borings using a
4.25-inch inside diameter holfor stem auger. Layne is a State-llcensed well driller in Utah.
The well driller and Olympus willcollect soil samples using a split spoon soil sampler at five-
foot intervals until ground water is identified in the boring. Soilcutings, generated during the
boring program, will be drummed and stored at the Facility pending disposal anangements.
Olympus will collect the soi! samples with brass sleeves inserted in the split spoon sampler.
After collection, u/e will sealthe brass tubes with teflon and plastic end caps. We willthen
package and ship the samples, using chain of custody protocol, for laboratory analyses. The
laboratory willanalyze the samples for HVO compounds using procedures documented in SW-
846 l/lethod 8010. Analyses usrng SW-84e8010 methodology witl detect the contaminants of
@ncem identified in the SIP at a lourer cost than the SIP specified analyses SW-846 Method
8260. The SW-846 Method 8O10 analyte list is more selective to HVO compounds than
Method 8260 and reports laboratory detection limits appropriate for site assessments.
Based upon hydrogeologic research and field observations, Olympus will seleet three of the
soil borings for monitoring well completions in the shallqr aquifer at the Facility. These wells
will be used to evaluate the extent of HVO contamindion in grcund water (atthe UST basin)
and to determine the ground water flour direction and gradient. Layne will advance these
borings to a depth eight feet betow the water table and comphte the borings as tro.inch
diameter PVC monitoring wells. The monitoring wells will consist of 10 feet of well screen with
the remainder being weH casing. The driller will pack the wel] sctreBns with a washed filter sand
media, set a bentonite seal turo to three feet above the screened interval, and complete each
boring as a flush grade installation wisr a locking waterpoof well cap. Layne will complete the
wells in compliance with applicable local, state, and federal standards
Follonting vuell completion, Olympus will develop the wells in prcparation for ground water
sampling. We willdevelop the wells by over-pumping and surging. Following well
development, Olympus wilt purge and sample the rnonitoring uelts using new polyethylene
disposable bailerc. Olympus will drum development and purge waterfor storage at the Facility
pending disposalanangerlents. ln addition, we will rleasure and record temperature, pH,
electrical conductivity, and dissolved orygen in ground water at each well. Olympus will also
d:\tsc.7E85\deq 3.{ ra.doc
Utah Division of Solid and ,l"ous Waste
March 4, 1998
Page 3
survey the monitoring wells for vertical and horizontal control and gauge ground water
elevations so that we can calculate ground water flow direction and gradient for the better
placement of additional ground water monitoring points, if wananted.
Olympus will collect the ground water samples into laboratory provided vials appropriate for the
selected sample analyses. After collection, we will package and ship the samples for
laboratory analyses, using chain of custody protocol, to the selected Iaboratory. The laboratory
willanalyze the samples for halogenated volatile organic (HVO) compounds using procedures
documented in SW-846 Method 8010.
Based upon the results of the initial investigation, Olympus will determine if additional soil
and/or ground water investigation is wananted at the Facility. We will continue this
investigation, if wananted, using a phased soil-.probing and monitoring well installafion
approach. We will use soil-probing techniques to collect ground water samples from locations
and depths thatwillallow us to better map the extent of HVO compounds in the subsurface.
Once the full horizontal and verticalextent of HVOs in the subsurface has been mapped,
additionalground water monitoring wells can be located and installed, as appropriate.
The proposed changes to the SIP are designed to more efficiently and cost effectively assess
hydrogeologic and HVO contaminant properties at the Facility. The proposed lnvestigation
plan will obtain cost effective data with a higher level of quality that will allow for a reduction in
the number of sampling points required. The proposed revisions to the SIP strategically locate
sampling points required to assess the HVO contamination at the Facility by:
r better assessing potential contaminant pathways at the onset of the investigation (initial
soil borings and monitoring wel! completions);. defining horizontal and vertical extent of contaminant migration (soil-probing); ando locating additional monitoring wells, as ne@ssary, to better delimit contaminant plume
boundaries.
SCHEDULE
Olympus proposes the foltowing schedule (after Division of Solid and Hazardous Waste
approval) to complete the above-described assessment:
o week 1 - background research and contractor scheduling;. week 2 - soil boring advancement and monitoring wellcompletions;r week 3 - monitoring welldevelopment and sampling for laboratory sample analyses;o weeks 4 and 5 - laboratory analyses and data evaluation;. week 6 - soil probing and sampling for laboratory analyses (if required);. weeks 7 and 8 - laboratory analyses and data evaluation;e w€Gk I - additional monitoring well installations (if reguired);o week 10 - monitoring well development and sampling for laboratory sample analyses;o rreeks 11 and 12 - laboratory analyses and data evaluation; ando week 13 and 14 - assessment report preparation and review;o week 15 - assessment report submittal.
d:Usc.7585Ueq 3-4 ra.doc
l,ri
.i,,
Utah Division of Solid and ,l"ous Waste
March 4, 1998
Page 4
Please feelfree to contact Lucy Jenkins of Parsons Behle & Latimer (LSC legalcounsel) at
(801) 532-123,4 or me at [phone], fax [phone], the above address, or via Email
at [e-mail] should you have any questions or comments.
Sincerely,
tl,l,t/tr' ,-tru-
Michael Backe, P.G.
Senior Hydrogeologist
Enclosure
cc: Craig Reaveley, LSC
Lucy B. Jenkins, Parsons Behle & Latimer
file
d:Usc.7585\deq 3-4 ra.doc