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_P UBLIC HEALTH SERVICES <br /> SAN f OAQUIN COUNTY Q= ca <br /> ENVIRONMENTAL HEALTH DIVISION <br /> Karen Furst, M.D., M.P.H., Health Officer P <br /> 304 East Weber Avenue, Third Floor • Stockton, CA 95202 <br /> 209/468-3420 <br /> n <br /> BUTCH SCHMIDT <br /> (DFD <br /> STOCKTON UNIFIED SCHOOL DISTRICT (SUSD) <br /> 1932 EL FINAL DRIVE AL 01 <br /> STOCKTON CA 95205 <br /> RE: STAGG HIGH SCHOOL SITE CODE. 1C27 <br /> 1621 BROOKSIDE ROAD <br /> STOCKTON CA 95206 <br /> e <br /> A monitoring well screened from 8 feet below surface grade(bsg) to 23 feet bsg was installed in the <br /> center of the former 300-gallon gasoline underground storage tank(UST) at the above referenced site on <br /> February 25, 1999. San Joaquin County Public Health Services, Environmental Health Division <br /> (PHS/EHD) has reviewed Summary Report of Additional Subsurface Investigation dated June 1, 1999 <br /> prepared by ATC Associates, Inc(ATC). Analytical results of the soil sample collected at 10.5 feet bsg <br /> were 1,900 parts per million (ppm) of Total Petroleum Hydrocarbon as gasoline (TPH-g), 7.3 ppm of <br /> Toluene, 18 ppm of Ethyl-benzene, and 120 ppm of Total Xylenes. Analytical results of the soil sample <br /> s taken at 23.5 feet bsg were 2.5 ppm of TPH-g,0.0074 ppm Ethyl-benzene, and 0,045 ppm of Total <br /> Xylenes_ Methyl Cert-Butyl Ether(MTBE) was non-detect at above detection limit in any of the soil <br /> samples. Depth to groundwater during MWA development was measured to be at 9.95 feet bsg. <br /> Analytical results of the water sample collected from MW-1 were 3,900 parts per billion (ppb) of TPH- <br /> g, 86 ppb of Toluene, 100 ppb of Ethyl-benzene, 530 ppb of Total Xvlenes, and 12.5 ppb of MTBE_ <br /> Laboratory analyses of soil samples collected from four soil borings advanced in August 1997 indicated <br /> minimal petroleum hydrocarbon presence; however,analytical results of the grab water sample were <br /> 30,600 ppb of TPH-g, 20 ppb of Benzene, 1,400 ppb of Toluene, 484 ppb of Ethyl-benzene,and 6,060 <br /> ppb of Total Xylenes. PHS/EHD concurs with the ATC's conclusion that the extent of the soil <br /> contamination is limited to the upper 24 feet of soil and within an area eight feet from the former UST <br /> excavation. The necessity of further investigation will be evaluated after additional groundwater <br /> monitoring. <br /> If you have any questions, please feel free to contact Jeffrey Wong at (209) 468-0335. <br /> Donna Heran, REHS,Director <br /> Environmental Health Division <br /> Jeffrey Wong, ftEHS zlg�erl io, RENS <br /> J � <br /> LOP/Site Mitigation Unit IV Supervisor <br /> c: RWQCB, Central Valley Region-Mark List <br /> c: ATC Associates Inc. -Tom Lutterman <br /> A Division of San Joaquin County Health Care services <br />