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PUBLIC ?1EALTH SERV CES ,N <br /> P <br /> SAN JOAQUIN COUNTY. ?°- `O°c <br /> _ 2 <br /> ENVIRONMENTAL HEALTH DIVISION <br /> Ernest M. Fujimoto, M. D., M.P.H., Acting Health Officer <br /> 304 E. Weber Ave., Third Floor • P. O. Box 388 • Stockton, CA 95201-0388 <br /> 209/468-3420 Corm—T <br /> JEFF GRANBERRY Iff <br /> SHELL OIL DEC 2 0 1996 <br /> P 0 BOX 4023 <br /> CONCORD CA 94524 <br /> Re: Shell Service Station Site Code: 1223 <br /> 6131 Pacific Ave <br /> Stockton CA 95207 <br /> San Joaquin County Public Health Services, Environmental Health Division <br /> (PHS/EHD) has completed review of the "Quarterly Monitoring Report - Third <br /> Quarter 1996" dated October 30, 1996 prepared by Enviros and Enviros <br /> correspondence dated October 10, 1996. PHS/EHD has the following comments <br /> for your consideration. <br /> The groundwater samples that were collected from monitoring wells, MW1 and <br /> MW2 on August 23, 1996 were analyzed on September 9, 1996, outside of the 14 <br /> days holding period. A water sample was collected on September 5, 1996 from <br /> one of the two vapor extraction wells, VEW1 , and analysis detected petroleum <br /> hydrocarbons including methyl tertiary butyl ether (MTBE) by EPA Method 8260. <br /> PHS/EHD agrees that the sample collected from VEW1 which is screened from 5 to <br /> 20 feet below ground surface (bgs) likely does not represent groundwater <br /> conditions in the aquifer; however, the groundwater sample results indicate that <br /> there is likely a surface drainage problem. Given the significant concentrations <br /> observed in VEW1 : 3,500 ppb TPH-gas, 93 ppb MTBE, 55 ppb benzene, 6 ppb <br /> toluene, 410 ppb ethylbenzene, and 380 ppb xylene; PHS/EHD recommends that <br /> all wells undergo surface seal checks and repairs made where necessary. <br /> Field notes from the August 23, 1996 sampling event indicated that the free <br /> product skimmer was still located in MW3. As free product has not been observed <br /> at this site for over a year, PHS/EHD suggests that the skimmer may better serve <br /> Shell in some other location, i.e. 2575 Country Club Boulevard, in Stockton. <br /> A Division of San Joaquin County Health Care Services <br />