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California Regional Water Quality Control Board <br /> TAA <br /> Central Valley Region <br /> Robert Schneider,Chair <br /> Winston H.Hickox Gray Davis <br /> Secretary for Sacramento Main Office Governor <br /> Environmental Internet Address: http://www.swrcb.ca.gov/—rwgcb5 <br /> Protection 3443 Routier Road,Suite A,Sacramento,California 95827-3003 <br /> Phone(916)255-3000•FAX(916)255-3015 FRECE E10 <br /> 28 August 2003 AUG 2 9 2003 <br /> Mr. William Moranda ENVIRONMENT HEALTH <br /> c/o Mid-Valley Construction PERMIT/SERVICES <br /> Former Buffalo Tank Corporation <br /> 5709 East Highway 26 <br /> Stockton, CA 95204 <br /> PRELIMINAR Y SITE ASSESSMENT REPORT REVIEW, FORMER BUFFALO TANK <br /> CORPORATION, 5709 EAST FREMONT STREET, STOCKTON, SAN JOA QUIN COUNTY <br /> I reviewed the Preliminary Site Assessment Report, Former Buffalo Tank Corporation, <br /> 5709 East Fremont Street, Stockton, San Joaquin County (Report) dated 26 August 2003, submitted on <br /> your behalf by Advanced GeoEnvironmental, Inc. (AGE). The Report documents the soil results from <br /> one soil boring that was sampled down to 52 feet below ground surface (bgs), where the GeoProbe® <br /> encountered refusal. Although groundwater was not encountered, soil contamination (total petroleum <br /> hydrocarbons, gasoline (TPHg); toluene, ethylbenzene, and xylenes) was reported down to 40 feet bgs: <br /> Constituent' 20 feet bgs 25 feet bgs 30 feet bgs 35 feet bgs 40 feet bgs 50 feet bgs <br /> TPHg 11,000 3,900 4.2 160 <1.0 <1.0 <br /> toluene <5.0 3.1 0.025 0.29 <0.005 <0.005 <br /> eth lbenzene 11 7.5 0.10 0.47 <0.005 <0.005 <br /> xylenes 600 370 1 2.84 1 14.5 1 0.028 <0.01 <br /> 1=soil concentration in milligrams/kilogram(mg/kg) <br /> Lead scavengers and fuel oxygenates were not detected in soil. The Boring Log shows a silty, fine sand <br /> unit exists below 42 feet bgs (no soil core recovered between 42 and 50 feet bgs), which represents a <br /> more permeable zone than the shallower clays and silts. AGE stated in a phone conversation stated that <br /> they believe groundwater is just below 50 feet bgs. The Report recommends further investigation of the <br /> lateral and vertical extent of contamination, using a hollow stem auger drill rig to collect either grab <br /> samples or install monitoring wells. <br /> Comments: <br /> As stated in my 5 August 2003 letter for a revised Workplan, the proposed additional site assessment <br /> Workplan (Workplan) should include the following elements to adequately delineate petroleum <br /> hydrocarbon contamination previously detected at the site: <br /> 1. At least five borings for vertical and lateral delineation of contamination. One boring should be <br /> located between the former north and south USTs. <br /> California Environmental Protection Agency <br /> 05 Recycled Paper <br />