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N <br /> BE-LT BY.rettler-Ryan inc, 403_12-9i ; 10:08 : µ <br /> GWSInc. <br /> 2140WEST WINTON AVENUE <br /> HAYWARo, CALIFORNIA 94545 <br /> (510) 352-0500 <br /> March 11, 1992 <br /> D <br /> San Joaquin County Public Health Services MAR 12 1992 <br /> P,O, Box 2009 <br /> Stockton, California 95201 ENVIRONMENTAL HEALTH <br /> Attention: Mr, Michael Collins PERMIUSERVICES <br /> Reference: Former UNOCAL Service Station No. 0187 <br /> 437 East Miner Avenue <br /> Stockton, California <br /> Mr. Collins: <br /> As per your request during a telephone conversation on March 11, 1992, <br /> GeoStrategies Inc. (GSI) is submitting this scope of work for approval to <br /> overexcavate contaminated soil at the above referenced site. The site is <br /> abandoned and currently being demolished by Gettler-Rvan Inc.. During r�-, ane <br /> soil sampling witnessed by a SJCPHS representative, a soil sample was collected <br /> approximate)y 3 feet below grade in the product piping trench near a former <br /> vapor pot (Plate 1). The sample contained TPH-Gasoline at a concentration of <br /> 150 ppm. The contamination appears to be localized around a former vapor pot. <br /> This scope of work will include: (1) excavation of soil from the area of known <br /> contamination,, (2) stockpiling excavated soils and sampling for disposal, and 3 <br /> collection of one verification p p ( ) <br /> aeon soil sample from the bottom of the excavation. <br /> While ov��rexcavating, soils will be visually inspected and field screened for <br /> possible contamination by a GSI geologist using an organic vapor meter (OVM). <br /> Excavation of soils will continue until field observations and screening of soils <br /> indicates that no further contamination is present. A verification sample will be <br /> collected and analyzed by a State-certified laboratory for TPH-Gasoline, BTEX, <br /> EDB and total lead. Upon receipt of the analytical data, the excavation will be <br /> either deepened and another soil sample collected (if contamination is identified), <br /> or backfilled with clean rill material and compacted. <br /> Stockpiled soil sant ' ; w'.l; be collected by GSI and analyzed by a State- <br /> certified - oratory T'PH-Gasoline, BTEX, EDBs and total lead as required <br /> for dispc upon f <br /> P o the analytical d ed to <br /> an appropriate disposal facility. It is ME <br />