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PUBLICIIEALTH SERVICES <br /> SAN JOAQUIN COUNTY <br /> ENVIRONMENTAL HEALTH DIVISION `0= <br /> Ernest M. Fujimoto, M.D., M.P.H., Acting Health Officer <br /> �/FpR <br /> 445 N. San Joaquin Street • P.O. Box 388 0 Stockton, CA 95201-0388 <br /> (209) 468-3420 <br /> MIKE BEAN <br /> CHIEF OF PLANT OPERATIONS <br /> STOCKTON DEVELOPMENTAL CENTER COPY <br /> 510 E MAGNOLIA ST <br /> STOCKTON CA 95202 JAN 17 199") <br /> RE: Stockton Developmental Center SITE CODE: 1165 <br /> 510 E. Magnolia Street <br /> Stockton CA 95202 <br /> San Joaquin County Public Health Services Environmental Health Division (PHS/EHD) has <br /> reviewed the September 9, 1994 Technical Work Plan Preliminary Site Assessment (workplan) <br /> submitted by Tetra Tech for the above referenced site. <br /> The workplan focuses only on subsurface contamination identified at the former Tank #2 <br /> location. Tank #2 was removed September 23, 1991. Results of laboratory analyses of samples <br /> obtained from the excavation confirmed residual concentration of Total Petroleum Hydrocarbons <br /> as Diesel of 1.2 and 1.4 parts per million. The maximum allowable level of residual diesel <br /> contamination based on conditions at this site is 100 parts per million. Therefore further <br /> investigation and remediation of the former tank #2 excavation is not required. <br /> Tank #1 was also removed on September 23, 1991. Results of laboratory analyses of <br /> confirmation samples obtained from this portion of the excavation was non detect for Total <br /> Petroleum Hydrocarbons as Diesel and the volatile aromatics Benzene, Toluene, Ethylbenzene <br /> and Xylene. Therefore further investigation and remediation of the former tank #1 excavation <br /> is not required. <br /> Results of laboratory analyses of samples obtained from slant borings drilled on May 1, 1991 <br /> beneath Tank#3 indicate the presence of significant soil contamination from 15 to 20 feet below <br /> ground surface. Tank #3 is located within 8 feet of the northwest footing of the water tower. <br /> This diesel tank has been classified as an incomplete closure in place. Further investigation and <br /> remediation of Tank #3 is required. <br /> Section 2.0 of the workplan states that a letter from the PHS/EHD, dated February 1, 1994 <br /> indicated the presence of petroleum hydrocarbons from confirmation samples collected in the soil <br /> beneath the UST removed on September 23, 1991 (Tank#2). The letter which has been enclosed <br /> as page one of appendix B of the workplan does not specify a tank number, only the date the <br /> tank(s) was/were removed. As stated earlier tanks 1 and 2 were removed on September 23, 1991 <br /> and laboratory analyses of confirmation sampling qualifies these tanks for a clean closure. <br /> A Di%ision of San Joaquin County Health Care Services <br />