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JUL 0 5 tggrtUPDATE ON THE CORRECTIVE ACTTON PLAN FOR THE
CASH SAVER SERVICE STATION LOCATED AT 305 sCIuIlftI{AIN STREET RICEFTELD. UTAII RESPOfVSE
Release Site: EGUP Facilit v xo #z 2OOO222
Date: June 28, 1994
In 1992, Wasatch Environmental, Inc., of Salta Site Characterization & fnitial Subsurfaceon the above property after contamination wastank removal activities.
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Lake CiLy prepared
Investigation Report
discovered during
They reported the discovery of high levels of soil andgroundwater contamination on the property with the contaminationbeing greatest on the south side of the property which happensto border on a residentiar property on which a one famirydwelling sits. The dwerring is only about five feet from thecash saver property rine and dj-rectly south of the area thatshows the highest levels of contamj_nation.
The direction of groundwater flow is to the southeast.
wasatch Envj-ronmental did not perform any investigations onthe adjoining property in order to determj-ne if the residentialproperty was impacted by offsite mj-gration of the contami-natj-on.
rn 1993, Triton Environmental services of salt Lake cityundertook such an investigation. Working with Geo-Environmentalof SaIt Lake City, four borings were emplaced with Geo-Environmental's hydraulic boring tool to a depth of nine feetwith soir samples being taken from seven to nine feet BLS.
Due to the presence of extremely tight crays, groundwater didnot enter the bore holes and, conseguently, groundwater sampleswere not directry collected. However, the soil samples were .4.Lquite moist and it is bel-ieved that these soil samples were { /\
removed from the saturated zone. Ats'o, the depth to groundwater
was at 6.5 feet in the monitoring welrs that exj-st on the cashsaver property. These sampres shourd, therefore, detect thepresence of groundwater contamination such that the geometryof a contaminant plume can be estimated.
Indeed, offsite migration of the contamination did occur whichresulted in a contaminant plume which extended in a southeasterlydirection to the southern boundary of the residential property.About half of the basement of the house was located within theplume's geometry as was about harf of the back yard. Benzeneconcentrations ranged from 0 ppm to 2.02 ppm and TpFIconcentrations ranged from 0 ppm to 1 t190 ppm.
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In light of these findings, corrective action was implementedin order to abate and remediate the contamination. WasatchEnvironmentar had instarled three four-inch diameter vaporextraction we1ls just north of the house on the Cash Saver sideof the property line. These wells vrere also in the midst ofthe contaminant plume.
A11 three of the vapor extraction we11s were connected to the
vacuum port of a Rotron regenerative blower rated at 1 50 cubicfeet per minute. A sample of the vapors revealed a benzeneconcentration of 0.028 mg/liter and a TPH concentration of 0.540mg/Iiter. These concentrations correspond to daily removal ratesof 0.377 pounds per day of benzene and 7 .28 pounds per day ofTPH. It appears that the vapor extraction is performj_ng quiteweII.
fn order to determine if any vaporsthe air in the basement was sampledactivated carbon tube. American West
Lake City supplied the sampling pump
and performed the analysi-s.
are entering the house,for eight hours with anAnalytical Labs of Sal-t
and activated carbon tube
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Ambient basement air was drarnin through the activated carbontube for eight hours at a rate of 200 cc per minute. Laboratoryanalysis of the tube revealed that a total of 0.8 microgramsof benzene was collected. This amount corresponds to aconcentration of 0.00833 mg per cubic meter.
For benzene, 1.0 ppm is equal to 3.25 mg per cubic meter. Inthis case, the benzene concentration in the basement ai-r isegual to 0.00256 parts per million. The NIOSH TWA limit for
benzene exposure is 0.1 ppm and the OSHA TWA limit for benzene
exposure is 1.0 ppm. The benzene concentration in the basementis we}l below the regulatory limits.
It should be noted that the entire ground surface between thevapor extraction wells and the basement of the house is coveredover with either asphalt or concrete. This prevents the "shortcircuiting" of air from the atmosphere into the subsurface region
which is under the influence of the vacuum. ft is believedthat the subsurface pocket of vacuum extends to the basementwalls thereby preventing the migration of contaminant vaporsinto the house.
ft is Premiumrs Oil intent to purchase the residential parcelof land and the house in order to expand the service station.At that time, the remaining contaminated soil will be removed
and groundwater remediation eguipmenL will be instatled.
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e208 o Groundwater monitoring well with groundwater elevation in feet
e20 <Groundwater elevation contour line with apparent flow direction, elevation in feet
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Underground utility liae: -G- gas, -S- sewer. -I[- water
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FIGURE 3: GROUNDTTATER ELEVATION CONTOUR MAP,
CASH SAVER, RICHFIELD, UTAH
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North South Main Street, Richfield05
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Results of soir sampling Taken rmmediatery south of the cashservice station at 305 south Main street, Richfield, utah
Sampling Date: Dec. 9, 1993
Sampling Depth; 7-9 feet BLS
Results are given in Parts per MJ-Ilion
Location Benzene Toluene Ethylbenzene Xylenes Naphthalene
#1
{12 2.020 1i " 000 4.390 31 .800 1 .260
#3 0.345 1.430 0.639 3.680 0.493
#4 0.036 0.234 0 -265 2.070 0.090
Saver
NDNDNDNDNDND
TPH
1t190
230
123