DSHW-2024-004990

Galtt a^ct tGtrLt,7vrr,o
October 30, 1998
Rob Powers
Utah Division of Solid and Hazardous Waste
288 North 1460 West
P.O. Box 144880
Salt Lake City, Utah 84114
Continuing Site Investigation
Laundry Supply Company
Salt Lake City, Utah
Olympus Work Order # 7585
Dear Mr. Powers:
Olympus Environmental, lnc. (Olympus), on behatf of Laundry Supply Company (LSC), is
proposing to continue its site investigation at LSC's facility located at 3785 West 1987 South in
Salt Lake City, Utah (Facility). The purpose of this investigation is to better determine the
nature and extent of subsurface halogenated volatile organic (HVO) compounds in the shallow
aquifer at the Facility. This investigation is being performed in accordance with the Utah
Department of Environmental Quality, Division of Solid and Hazardous Waste (DSHW-
approved Site lnvestigation Plan and its approved revisions for the Facility.
ln an effort to better define the nature and extent of HVO compounds in ground water at the
Facility, Olympus proposes to continue the assessment down-gradient of the release area.
We propose to continue the assessment using soil probing/ground water sampling techniques.
ln addition to the soil probing/ground water sampling program, we also propose to advance soil
borings and complete monitoring wells based upon the data collected during the soil probe
ground water sampling investigation. Following well installation, Olympus will collect ground
water samples from new and existing Facility monitoring wells. ln an effort to complete
assessment activity in a cost effective and timely fashion, Olympus will complete the
assessment in the following stages.
STAGE 1 - ON.SITE SOIL PROBING
The Stage 1 objectives are to define the cross-gradient extent of PCE in ground water at the
Facility, northwest of SP-5 (Figure 1). This stage willconsist of pushing two additional soil
probes (SP-6 and SP-7) at the northwestern portion of the Facility, extending the line of probes
SB-1 through SP-S. As during the initialsoil probe investigation, we will locate the probes at a
spacing of 25 feet apart. Figure 1 shows the proposed soil probe locations.
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Utah Department of Environme
October 30, 1998
Page 2
Quality
Olympus and its soil probe subcontractor, EarthProbe of Salt Lake City, Utah, will collect the
ground water samples through a retractable screen fitted to the end of the soil probe rods
using polyethylene tubing and a peristaltic pump (outfitted with tygon tubing). Following a
minimal purge, we will collect the water samples at depths of 15, 25, and 35 feet below the
ground surface. Olympus will deliver the water samples in appropriate containers, using chain
of custody protocol, to OnSite Analytical Services, lnc. (OnSite) of Salt Lake City, Utah for
screening analyses. The laboratory will screen the samples for tetrachloroethene and
trichloroethene using a proprietary analytical method. The samples will be analyzed on a
"Rush" tumaround basis. One duplicate sample will be shipped to Evergreen Analytical, lnc.
(Evergreen) of Wheat Ridge, Colorado for confirmation analyses. Evergreen will analyze the
confirmation sample for HVOs using protocol established in SW-846 Method 8260.
Following sample collection, EarthProbe, will abandon the probe holes by sealing them with
grout. EarthProbe wil! decontaminate all down-hole equipment with a pressure washer.
Decontamination waterwill be contained in drums and stored at the Facility pending disposal
arangements.
STAGE 2 - SOIL BORING ADVANCEMENT'MONITORING WELL COMPLETIONS
lmmediately following the on-site soi! probing (Stage 1), soil boring advancement and
monitoring well completion will be initiated. Olympus and its drilling subcontractor, Layne
Christensen Company, of Salt Lake City, Utah, will complete this stage. We will begin by
advancing an up-gradient soil boring at the southwest corner of the Facility (Figure 1). This
soil boring location will be advanced to a depth at which the confining layer between the upper
and lower aquifer is encountered. Based upon our review of drilling logs maintained on the
lnternet by the Utah Department of Natural Resources, Division of Water Rights, the lower
aquifer in the Facility area has been encountered at depths between 31 and 57 feet below the
ground surface (BGS). To date, Olympus has advanced soil borings to a depth of 30 feet BGS
and soil probed to a depth of 37 feet BGS. We propose to advance the up-gradient soil boring
to a depth at which the soil boring samples indicate the presence of a confining unit up to a
maximum depth of 55 feet BGS.
Olympus will collect split spoon soil samples at five-foot intervals as the boring is advanced to
a depth of 40 feet BGS. We will screen the soil samples for tetrachloroethene using gas
detector tubes and log the samples for soil classification purposes. We will next continuously
collect split spoon samples up to a maximum depth of 55 feet BGS. The boring will be
terminated when the samples collected indicate the presence of a significant clay layer in
excess of two feet thick.
Olympus wi!! properly package and ship the sample collected from the bottom of the boring,
using chain of custody protocol, to an appropriate laboratory for physical testing. The
laboratory will test the soil sample for hydraulic conductivity using methodology established in
ASTM D5084-90. The soil hydraulic conductivity test will be used to establish the
impermeability of the confining unit above the lower aquifer at the Facility.
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ntal QualityUtah Department of Environme
October 30, 1998
Page 3
After collection of the borehole bottom sample, Layne will abandon the borehole to a depth of
30 feet below the ground surface with an appropriate grout. The driller will next complete the
remainder of the boring as a two-inch diameter ground water monitoring well (MW-4). Figure 2
shows the proposed well construction details.
Based upon the soil probe sample analytical data, and following the up-gradient well
installation, Olympus will locate additional cross-gradient monitoring wells at the Facility.
Figure 1 shows the proposed location of the westem cross-gradient well (MW-s), while the
eastern cross-gradient well location will be based on the Stage 1 soil probe sampling data.
Figure 1 also shows Olympus' estimated location of this cross-gradient well (MW-6). The
cross-gradient wells will be completed similarly to the existing and proposed up-gradient
Facility wells. The final completion depth, screen length, and riser length of these cross-
gradient wells may vary based upon the depth to the aquifer confining layer identified in the
up-gradient soil boring.
STAGE 3 - OFF-SITE SOIL PROBING
Stage 3 will consist of off-site soil probing down-gradient of the Facility. Stage 3a of the
assessment will consist of six soil probes (SP-8 through SP-14), spaced at approximately 50-
foot intervals, located approximately 200 feet down gradient of the SB-1 through SB-7 line.
Stage 3b of the assessment (if necessary) will consist of five soil probes (SP-14 through SP-
19), spaced at approximately 1OO-foot intervals, located approximately 400 feet down gradient
of the SB-8 through SB-14 line. Figure 1 shows the proposed soil probe locations. We may
adjust the probe locations based on the Stage 1 findings or due to physical constraints.
Olympus will determine the ground water sampling depths of these probes based upon the
stratigraphy identified in the up-gradient soil boring. We will select probe depths such that the
confining layer between the surficial and lower aquifer is not breached. The probe holes will
be abandoned as described in Stage 1.
STAGE 4+ - CONTINUED ASSESSMENT
As required to complete the ground water assessment, Olympus will propose additional stages
of down-gradient soil probing and monitoring well installations. ln addition, once local ground
water chemistry, stratigraphy and hydrogeology are better defined, we will propose down-
gradient monitoring well installations for long term ground water HVO plume monitoring.
GROUND WATER MONITORING
Olympus also proposes to initiate a quarterly ground water monitoring program at the Facility.
The program will consist of ground water elevation gauging, dense non-aqueous phase liquid
measurement, ground water sampling and laboratory analyses. Olympus will collect ground
water samples from existing and future monitoring wells using disposable polyethylene bailers.
Prior to well sampling, we will purge each well using the same bailers. ln addition to the
ground water sample collection, we will also measure field parameters including pH, electrical
D:\LSC.7585\DEQ 1 0-30",98 invesigation.doc
Utah Department of Environmental Quality
October 30, 1998
Page 4
conductivity, temperature, and dissolved oxygen. We will containerize purge water for
appropriate disposal.
SCHEDULE AND REPORTING
Olympus will initiate the above-described tasks immediately upon receipt of DSHW approval.
Fieldwork will begin once agreements for off-site access are in place and subcontractor
schedules are established. We anticipate the following schedule (following DSHW approval):
o week 1: access agreements, subcontractor scheduling, and utility locating;o week 2: Stage 1 soil probing and Stage 2 soil boring advancemenUmonitoring well
completions;. week 3: Stage 2 ground water monitoring well development and sampling;o weeks 4 and 5: Stage 1 and 2 data evaluation and reporting;o week 6: Stage 3 soil probing;
o weeks 7 and 8: Stage 3 data evaluation and reporting.
Please feelfree to contact Lucy Jenkins at Parsons Behle & Latimer (LSC legal counsel) at
[phone] or me at [phone] or via E-mail at [e-mail] should you
have any questions or comments.
OLYMPUS ENVIRONMENTAL, INC.
tY\Ivfh,uA
Michael Backe, P.G.
Senior Hydrogeologist
MAB
Attachmentscc: Craig Reaveley, LSC
Lucy B. Jenkirs, Parsons Behle & Latimer
File
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Laundry Supply Company
Salt Lake City, Utah
Monitoring Well lD: Prqposed .
Wqll $p,ecifications
L-l Setdown: 0.25 feet
L-z R i se r: ---T3-0" fe et
L-3 $creen: --Ed6-feet
Completion Date: NA
Prqte-ctiye Housi_ng yvith Lpcking Weterpfqof Wpll Qap
Diameter: 0.70 feet
Total Length : -TT6' feet
Stickupr ---T]i6-feet
Material: Steel
Upper Concrete Thickness:1.0 feet
Sand Drain Thickness: 13 feet
Lower Concrete Thickness: 0.8 feet
Riser Pipe
Diameter:2 inch
SUfacq Seal ,wilh A[nular $pace Prqin
Type of Seal: Concrete/Sand Drain
Material:ffi4oPVc
Backfilf :
Seal
Type of Seal:
Thickne$s:
Distance Above Screen:
Bentonite Pellets
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Diameter:
Slot Size:
Material:
Filter Pack:
2 inch
0.010 inchffic
10-20 Silica Sand
Depth to Bottom of
Filter Pack: 39,5 feet
Bpr:ehgle Seal
Type of Seal:
Thickness:
Borehole Diameter:
Bentonte Grout
24.5 feet
I inches
L-4 Bottom Cap
L-5 Well Depth:
L-6 Boring Depth:
0,25 feet--3-o2s feet
55.00, feet
Elqyatigns
Top of Housing:
Top of Casing:
$urface
feet
feet
feet
oEt/7585 firugB
NA
NA
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