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GSAGeoStrategies Inc. <br /> 2140 WEST WINTON AVENUE <br /> HAYWARD, CALIFORNIA 94545 (510)352-4800 <br /> February 28, 1992 IAV <br /> San Joaquin County Public Health Services iJU ` MAR 7 1992 <br /> P.O. Box 2009 Vi <br /> Stockton, California 95201 ENVIRONIAEN FAL HEALTH <br /> Attention: Ms. Diane Hinson PERMIT/SERVICES <br /> Reference: UNOCAL Station No. 0187 II ' �� j►4� <br /> 437 East Miner Avenuef,0 <br /> Stockton, California rr���V�Y <br /> ii <br /> Ms. Hinson: '�� t l J <br /> As requested by Carol Oz of San Joaquin County ublic Health Services 1, <br /> (SJCPHS) during a telephone conversation on February 27, 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 <br /> routine soil sampling witnessed by a SJCPHS representative, a sample <br /> collected approximately 3 feet below grade in the product piping trench <br /> near a former vapor pot identified a TPH-Gasoline concentration of 150 <br /> ppm. The contamination appears to be localized around a former vapor pot. <br /> This scope of work will include; soil excavation in the area of known <br /> contamination as described above, stockpiling of excavated soils and <br /> sampling for disposal, and collection of a sample from the bottom of the <br /> excavation. While overexcavating, soils will be visually inspected and <br /> field screened for possible contamination by a geologist using an organic <br /> vapor meter (OVM). Excavation of soils will continue until field <br /> observations and screening of soils indicates no further contamination is <br /> present. At this point, one soil sample will be collected at the bottom <br /> of the excavation and analyzed by a State-certified laboratory for <br /> TPH-Gasoline, BTEX, EDBs and total lead. Upon receipt of the analytical <br /> data, the excavation will be either deepened and another soil sample <br /> collected (if contamination is identified), or backfilled with clean fill <br /> material and compacted. <br /> The stockpiled soil will be sampled and analyzed by a State-certified <br /> laboratory for TPH-Gasoline, BTEX, EDBs and total lead as required for <br /> disposal. Upon receipt of the analytical data, the soil will be <br /> transported to an appropriate disposal facility. <br /> The results of this work will be documented and presented in a report <br /> prepared upon completion of the field work, receipt of the analytical <br /> results, and disposal of the excavated soils. <br />