Laserfiche WebLink
GeoStrate ies Inc. <br /> GSI g . »v <br /> 2140 ARD, AUTON AVENUE g?" . 5 <br /> HAYWARD, CALIFORNIA 94545 4 � ARp? (510)352-4800 <br /> March 11, 1992 <br /> n Public <br /> San Joaquin County Pub c Health Services <br /> P.O. Box 2009 <br /> Stockton, California 95201 <br /> Attention: Mr. Michael Collins <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-Ryan Inc.. During routine <br /> soil sampling witnessed by a SJCPHS representative, a soil sample was collected <br /> approximately 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 soil sample from the bottom of the excavation. <br /> While overexcavating, 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 fill material and compacted. <br /> Stockpiled soil samples will be collected by GSI and analyzed by a State- <br /> certified laboratory for TPH-Gasoline, BTEX, EDBs and total lead as required <br /> for disposal. Upon receipt of the analytical data, the soil will be transported to <br /> an appropriate disposal facility. It is estimated that the stockpile will contain no <br /> more than 20 cubic yards of soil. <br />