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c <br /> PUBLIC HtALTH SERVICS <br /> SAN JOAQUIN COUNTY <br /> ENVIRONMENTAL HEALTH DIVISION N: T <br /> Karen Furst, M.D., M.P.H., Health Officer <br /> 304 East Weber Avenue, Third Floor - Stockton, CA 95202 Q``i °b <br /> 209/468-3420 <br /> JUL 2 1. 2000 <br /> BUTCH SCHMIDT <br /> STOCKTON UNIFIED SCHOOL DISTRICT (SUSD) <br /> 1932 EL PINAL DRIVE <br /> STOCKTON CA 95205 <br /> RE: STAGG HIGH SCHOOL SITE CODE: 1027 <br /> 1621 BROOKSIDE ROAD <br /> STOCKTON CA <br /> San Joaquin County Public Health Services,Environmental Health Division (PHS/EHD) <br /> has reviewed S 1 garter 2000 GmundieuterMmztt in$Report(the report) dated <br /> June 26, 2000 for the above-referenced site prepared by ATC Associates, Inc (ATC). <br /> Analytical results of the groundwater sample collected from Monitoring Well (MVS # 1 has <br /> dropped from 3,900 parts per billion (ppb) of Total Petroleum Hydrocarbon as gasoline <br /> (TPH g) in February 1999 to 65.9 ppb of TPH g in June 2000. Methyl tert-Butyl Ether <br /> (MTBE) has been non-detect at a detection limit of 2.00 ppb the last two quarters,although <br /> it was detected at 12.5 ppb in February 1999. Levels of Toluene, Ethyl-benzene and Xylenes <br /> have also dropped since February 1999. Depth to groundwater was at 8.82 feet below <br /> surface grade (bsg) in March 2000, rising from 11.95 feet bsg in July 1999 and 9.95 feet bsg <br /> in March 1999. Conclusions and recommendations for next phase of investigation or <br /> remediation to bring the site toward closure were not provided in the report. <br /> The extent of the contamination in groundwater has not been defined. According to <br /> Sunvmry Report of Additional Subsurface Inuvigaion dated June 1, 1999 prepared by ATC <br /> regional groundwater flow is estimated to be eastward according to San Joaquin County <br /> Flood Control and Water Conservation District. However,since local groundwater gradient <br /> direction, pumping influences, and mass balance of the contamination in groundwater are <br /> unknown, the actual cause of the reduction in the concentration of the groundwater samples <br /> is also unknown. Although analytical results of the soil samples from four soil borings (SB-1 <br /> to SB-4) advanced in the vicinity of the tank pit in August 1997 were all non-detect at <br /> appropriate detection limits, only one grab water sample from SB-1,located near MW-1 was <br /> collected from the 4 borings. Analytical result of the grab water sample collected at 15 feet <br /> bsg were 30,600 ppb of TPI I g, 1,400 ppb of Benzene,484 ppb of Ethyl-Benzene, and 6,060 <br /> ppb of Total Xylenes, mirroring analytical results of MW 1 groundwater sampling in March <br /> 1999. The lateral and vertical extent of the contamination has not been defined. The <br /> analytical results of the soil samples collected at 10.5 feet and 23.5 feet bsg from MW-1 in <br /> February 1999 were 1,900 and 2.5 parts per million (ppm) of TPH g respectively. A <br /> continuous leaching source to groundwater may still exist and the contamination has not <br /> been defined. Submit a work plan that will define the lateral and vertical extent of the <br /> contamination in soil and groundwater to PHS/EHD by September 15, 2000. <br /> A Division of San Joaquin County Health Care Services <br />