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PUBLIC ETH SERVICESpPQurN: C <br /> SAN JOAQUIN COUNTY <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, <br /> CA 95201=03$$' Lfko� <br /> 2091468-3420 <br /> JAN 0 9.19,7 <br /> JOSEPH TOSTE JR <br /> 2480 TOSTE RD <br /> TRACY CA 95376 <br /> RE: Grant Line Gas and Food <br /> SITE CODE: 1580 <br /> 2420 West Grant Line Road <br /> Tracy, CA 95276 <br /> San Joaquin County Public Health Services, Environmental Health Division (PHSIEHD) has <br /> completed review of Advanced GeoEnvironmental's " Quarterly Report - September 1996" <br /> dated October 30, 1996. PHSIEHD has the following comments for your consideration. <br /> The report included the results of the September 12, 1996 groundwater sampling event <br /> which continued to evidence significant groundwater contamination including floating <br /> product in the samples from MW4 and MW5 as reported by the analytical laboratory <br /> handling the samples. Also, significant methyl tertiary butyl ether (MTBE) was detected in <br /> the samples from MW4 of 1,700 ppb. This result of MTBE contamination from MW4 <br /> indicates the possibility of a new release, since the previous results of MTBE have been <br /> either below the detection limit of 5 ppb or 6.8 ppb. Selected samples collected during <br /> the fourth quarter 1996 groundwater sampling event should undergo MTBE analysis <br /> utilizing EPA Method 8260 to confirm the detections of MTBE observed utilizing EPA <br /> Method 8020. <br /> Please note that the depth to water measurements recorded on Table I Relative <br /> Groundwater Water Elevations and on Table 2 Analytical Results of Groundwater Sample <br /> for MW2 and MW6 do not correspond with the monitoring well field logs included as <br /> Appendix A of the report. Please provide clarification or corrections within the next <br /> quarterly report submitted. <br /> PHSIEHD stated in correspondence dated September 12, 1996 that Table 2 contained an <br /> error regarding the ethylbenzene result from MW2 and directed that the error be corrected <br /> prior to submittal of the next quarterly report. Please note that this correction was not <br /> made and should be made immediately. <br /> PHSIEHD concurs with the recommendation to install two additional monitoring wells to <br /> the west and east of MW4 and MW5, so that the groundwater plume can be defined, since <br /> both of these wells have repeatedly been reported to have floating product in them. Please <br /> submit a work plan within the next quarterly report to perform the additional soil and <br /> groundwater investigation required. PHSIEHD had previously requested this work plan be <br /> submitted by November 1, 1996. <br /> A Division of San Joaquin County Health Care Services <br />