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PUBLIC HEALTH SERVICES <br /> SAN JOAQUIN COUNTY c <br /> ENVIRONMENTAL HEALTH DMSION X <br /> Karen Furst, M.D., M.P.H., Health Officer <br /> 304 East Weber Avenue,Third Floor• Stockton, CA 95202 <br /> 209/468-3420 <br /> MIKE KARVELOT FILE COPY <br /> QUIK STOP MARKETS INC .OL 3 Q SW <br /> P O BOX 5745 <br /> FREMONT CA 94537 <br /> RE: QUIK STOP MARKET#121 SITE CODE: 1430 <br /> 1196 W. LOUISE AVE. <br /> MANTECA, CA 95336 <br /> San Joaquin County Public Health Services/Environmental Health Division <br /> (PHS/EHD) has reviewed the "Work Plan for Soil and Groundwater Investigation" <br /> dated July 14, 1998, which was prepared by Compliance & Closure, Inc. for the <br /> above referenced site, and has the following comments for your consideration. <br /> On March 26, 1998 three Underground Storage Tanks were removed from the <br /> site. Six soil samples (S-1 through S-6) and two groundwater grab samples (W- <br /> 1 and W-2) were taken from the former tank pit area. On April 3, 1998 two soil <br /> samples were taken from the dispenser island area (S-7 and S-8). Analysis was <br /> done on all samples for Total Petroleum Hydrocarbons as gas (TPHg), Benzene, <br /> Toluene, Ethylbenzene and Xylene (BTEX), and all oxygenates. Results of the <br /> soil sample analyses evidenced benzene contamination in S-2 of 15,000 parts <br /> per billion (ppb), and ethylbenzene and toluene contamination in S-3 of 21,000 <br /> ppb and 11,000 ppb respectively. All samples evidenced Methyl Tertiary Butyl <br /> Ether (MTBE) contamination, from levels of 14 ppb to 27,000 ppb. The water <br /> samples showed detectable levels of the oxygenate t-Amyl Methyl Ether (TAME). <br /> In addition, seven samples were taken from the stockpiled soil/gravel which had <br /> been removed from the tank pit. Only minor levels of BTEX and MTBE were <br /> noted from these samples. <br /> Preliminary data shows that City of Manteca municipal water well #15 is located <br /> less than 2000 feet from the Quik Stop site. This well is 260 feet deep and <br /> pumps at a rate of 2000 gallons per minute. Groundwater gradient in Manteca is <br /> known to be greatly affected by existing production wells. Prior to beginning any <br /> work at this site a complete well survey should be completed which shows the <br /> location of all agricultural, industrial, domestic, municipal and other wells located <br /> within a 2000 foot radius of the site. The construction of these wells, if known, <br /> should be included. <br /> A Division of San Joaquin County Health Care Services <br />