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} PUBLIC AEALTH SERCES <br /> pgU.�?Y <br /> SAN JOAQUIN COUNTY <br /> ENVIRONMENTAL HEALTH DIVISION <br /> Ernest M. Fujimoto, M. D., M.P.H., Acting Health Officers <br /> 304 E. Weber Ave., Third Floor • P. O. Box 388 • Stockton, CA 95201-0388 iii oR <br /> 2091468-3420 <br /> At <br /> ERIC JOHNSON <br /> TECHNICAL AND ECOLOGICAL_ SERVICES �� <br /> 3400 CROW CANYON RD <br /> SAN RAMON CA 94583 <br /> RE: PG&E Tracy Service Center SITE CODE: 1407 <br /> 502 East Grant Line Road <br /> Tracy, CA <br /> San Joaquin County Public Health Services Environmental Health Division (PHSIEHD) has reviewed <br /> the September 1996 Request for Closure report prepared by Jonas and Associates for the above <br /> referenced site. <br /> Please respond to the following comments so that PHSIEHD may continue processing your closure <br /> request: <br /> 1) Section 1.1 states that the dispenser was located directly over the tank. Section 32 states that <br /> an unknown quantity of soil was removed from the tank and pump island excavations. <br /> How many excavations were associated with this tank removal? Which report section contains <br /> the most accurate information? <br /> 2) Section 3.1 states that floating product was observed on the standing water in both borings. <br /> Neither the presence of free product nor floating product thickness has been tabulated in <br /> Appendix B of the report. <br /> 3) Section 3.1.2 reports groundwater analytical results in terms of parts per million rather than <br /> parts per billion. <br /> Current convention for reporting groundwater results is in parts per billion. <br /> 4) Section 3.3 states that MTBE was detected in well OW-2 at a concentration of .029 ppm, and <br /> non detectable in all other monitoring wells. <br /> The MTBE results have not been tabulated in Appendix B of the report. The laboratory data <br /> sheets for these analyses have not been submitted to PHSIEHD. <br /> 5) Section 3.4 describes the mass balance calculation of hydrocarbons in the subsurface in 1986- <br /> 88. The current mass balance is required for the closure report. Since the contaminant level <br /> OW-2 has dropped to ND levels the effective hydrocarbon mass may be interpreted to <br /> approach zero. This should be stated in the mass balance section of the report. <br /> 5) Section 4.2 of the report states that water samples collected from on site wells showed typical <br /> conductivity levels of 3,000 microsiemens per centimeter. <br /> A Division of San Joaquin County Health Care Services <br />