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ENTAL TECHNOLOGIES63 N <br /> CORPORATION <br /> ? 1 . 28 <br /> December 4, 1995 <br /> 94318-5-10 <br /> Ms Linda Turkatte <br /> San Joaquin County Public Health Services <br /> Environmental Health Division <br /> P O Box 388 <br /> Stockton, CA 95201-0388 <br /> Subject. Addendum to Closure Request Report - Mass of Contaminants Remaining in <br /> Soil, Former Coca-Cola Distribution Facility, 1100 North Wilson Way, <br /> Stockton, California <br /> Dear Ms. Turkatte <br /> In response to our recent phone conversation regarding the "Closure Request Report" for the <br /> subject site, Smith Environmental Technologies Corporation is pleased to present this <br /> addendum to the report containing calculations of the mass of contaminants remaining in soil at <br /> the site (Figure 1) <br /> Following soil remediation activities Smith Environmental drilled seven soil confirmation <br /> borings at the site to determine the extent of impacted soil, if any, remaining at the site Three <br /> to four soil samples were collected from each boring and submitted for laboratory analysis of <br /> total petroleum hydrocarbons as gasoline (TPHg), benzene, toluene, ethyl benzene, and <br /> xylenes (BTEX), and total petroleum hydrocarbons as diesel (TPHd) Of all the samples <br /> analyzed only one contained detectable concentrations of petroleum hydrocarbons (Table 1). <br /> Analytical results for confirmation soil sampling indicated that ethyl benzene and toluene were <br /> detected at concentrations of 0 010 and 0 16 parts per million, respectively, in the sample <br /> collected from boring CB-2 from 21 0 to 21 5 feet below ground surface (bgs) Samples from <br /> CB-2 at 16 5 and 45 0 were nondetect Also samples collected from surrounding borings CB- <br /> CB-4, CB-5, CB-6, and CB-7 were nondetect. To estimate the extent of ethyl benzene and <br /> toluene remaining in soil the worst case scenario was used This assumes that the ethyl <br /> benzene and toluene extend to the nearest points where nondetectable samples were collected <br /> (Figure 2) To calculate the mass of ethyl benzene and toluene the worst case scenario was <br /> also used. This assumes that the concentrations of ethyl benzene and toluene are present at the <br /> highest concentration detected within the extent of contamination <br /> N 10540061L'MRSIMAssLTR DOC 1 <br /> 1260 Graphics Drive Modesto,CA 95351-1502 (209)579-2221 Fax(209)579-2225 <br /> Engineering Consulting Remediation Construction <br />