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c <br /> aSPUBLIC H ALTH SERVIFELE CRY <br /> SAN JOAQUIN COUNTY <br /> ENVIRONMENTAL HEALTH DIVISION u) <br /> Karen Furst, M.D., M.P.H., Health Officer C'.. <br /> 304 East Weber Avenue, Third Floor • Stockton, CA 95202 4 <br /> 2091468-3420 <br /> ASHRAF & YASMIN ALI DEC 0 5 2000 <br /> 20 TWELVE OAKS DR <br /> PLEASANTON CA 94566 <br /> RE: Fast & Easy Mart <br /> 244 W. Harding Way <br /> Stockton, CA <br /> San Joaquin County Public Health Services, Environmental Health Division <br /> (PHSIEHD) has reviewed the work plan dated November 13, 2000, prepared by <br /> Advanced GeoEnvironmental, Inc. for the above referenced site. <br /> The work plan states that results of the environmental assessment performed at <br /> this site were not made available to PHSIEHD which is not correct. Please find <br /> enclosed boring logs, soil and groundwater analytical results from that <br /> investigation which occurred in November 1996. Low levels of contaminants <br /> were found during that investigation and the location of boring B2 appears to <br /> have been very close to the underground storage tanks (USTs). <br /> High levels of contamination were found in the soil sample collected beneath the <br /> north end of UST 2. Since the environmental assessment additional <br /> unauthorized releases of petroleum have occurred or the investigation missed <br /> the area of contamination. Clearly, a groundwater investigation is necessary. <br /> However, work should be conducted in phases since impact to groundwater has <br /> not been confirmed. In addition, the vertical extent of the contamination must be <br /> defined and this was not included in the work plan. <br /> Depth to groundwater at a nearby site was 21 feet below surface grade (bsg) in <br /> June 2000. The work plan proposes screened intervals of 25 to 45 feet bsg. The <br /> screened interval of the shallow monitoring wells should start at 20 feet or less <br /> bsg. Depth to groundwater in this area has been as deep as 60 feet bsg so the <br /> vertical investigation should extend to this depth. <br /> Further excavation of the soil at the north end of UST 2 did not occur in <br /> November 1998 when other areas of the former UST locations were excavated. <br /> The work plan proposed installation of a groundwater extraction well in this area. <br /> The decision to place a groundwater extraction well, vapor extraction well and/or <br /> monitoring well in this area should be based on the information gathered during <br /> the drilling of a boring in this area. if there is extensive soil contamination from <br /> 11 feet bsg to below groundwater, installation of a vapor extraction well to <br /> A Division of San Joaquin County Health Care Services <br />