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PUBLIC 1qEALTH SERVICES <br /> SAN JOAQUIN COUNTY <br /> ENVIRONMENTAL HEALTH DIVISION V <br /> Ernest M. Fujimoto, M. D., M.P.H., Acting Health Officer :. <br /> 304 East Weber Avenue, Third Floor • Stockton, CA 95202 <br /> 209/468-3420 3 :D 7\\V/-V <br /> WILLIAM STEWART <br /> 452 W LOWELL AVENUE JUN 2 4 M7 <br /> TRACY CA 95376 <br /> RE: Bill's Bait&Beacon SITE CODE: 1400123 <br /> 515 W. Eleventh Street <br /> Tracy, CA 95376 <br /> San Joaquin County Public Health Services, Environmental Health Division (PHS/EHD) has <br /> reviewed the"Closure Summary Report-May 1997"prepared by Advanced GeoEnvironmental, <br /> Inc. for the above referenced site. <br /> For the first time since September 1994 the groundwater sample collected from monitoring well <br /> MW1 was not diluted prior to analysis. Groundwater level has risen two feet since September <br /> 1994. Levels of total petroleum hydrocarbons(TRH) have risen and Benzene levels have <br /> decreased. MTBE was detected in the groundwater sample collected from monitoring well MW2 <br /> which is located down gradient of the new underground tank system. <br /> The existence of MTBE at this site must be further investigated and additional evidence to show <br /> that the level of groundwater contamination is decreasing is necessary. The chromatograms from <br /> past groundwater sample analysis should be reviewed for indications of MTBE so that if MTBE is <br /> confirmed in the groundwater, its source(old tank system or new tank system) is in the process of <br /> being determined. Groundwater samples should be collected from the monitoring wells and <br /> analyzed using EPA method 8020A(or8021 B)to detect BTEX,TPH-gasoline and MTBE. <br /> Samples positive for MTBE should be verified using EPA method 8240B (or 8260A). The <br /> groundwater samples should also be analyzed for TPH-diesel. <br /> After the results of the above work are known,the determination as to whether further action is <br /> required or an addendum to the closure report should be submitted will be made. The closure <br /> report dated May 1997 did not contain mass balance calculations for the amount of contamination <br /> removed and the amount of contamination that remains. These mass balance calculations must <br /> be included in the final closure report. <br /> If you have any questions contact me at(209)468-3449. <br /> Donna Henan, REHS, Director <br /> Environmental Health Division <br /> Margaret Lagorio, Supervising REHS <br /> Site Mitigation Unit <br /> c: Advanced GeoEnvironmental <br /> CVRWQCB - Beth Thayer <br /> A Division of San Joaquin County Health Care Services <br />