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GRANITE CONSTRUCTION FACILITY <br /> ' WKA No 2088 05 MAY 3 -1 1995 <br /> May 26, 1995 <br /> Page 2 ENVIRONMENTAL HEALTH <br /> PERMIT/SERVICES <br /> concentration of toluene was detected in MW7 No detectable concentrations of TPH as diesel <br /> were detected in monitoring wells MW1 through MW8 Analytical results of ground water <br /> samples obtained from the eight monitoring wells are summarized in Table 2 Chain-of-custody <br /> documentation and laboratory reports are included in Appendix B <br /> Based on the analytical results of this quarter, monitoring wells MW1 through MW3 continue to <br /> reveal moderately high concentrations of dissolved phase petroleum hydrocarbons The trace but <br /> detectable concentration of toluene detected in MW7 is not believed to be a result of ground <br /> water contamination associated with the former USTs based on the "up-gradient" location of the <br /> well and distance from the USTs A quality control analysis performed by our firm has found <br /> that disposable tubing sold as suitable for use in environmental sampling actually contained trace <br /> concentrations of toluene We have discontinued use of the tubing and informed the <br /> manufacturer of the problem A copy of the analytical results of the equipment water blank is <br /> also included in Appendix B <br /> The next quarterly ground water sampling event is scheduled for August, 1995 A summary of <br /> our findings will be transmitted upon completion of laboratory analysis <br /> We propose to change the sample analyses to TPH as gasoline and BTEX based on no detectable <br /> concentrations of TPH as diesel detected in water samples collected on a quarterly basis since <br /> March 1993 Upon San Joaquin County Public Health Service Department's approval, ground <br /> water samples will be analyzed for TPH as gasoline and BTEX only A letter addressing our <br /> proposed change in analyses will be addressed under a separate cover Please call if you have <br /> any questions regarding this report <br /> Wallace ■ Kuhl & Associates, Inc <br /> r <br /> Michael Watari Eric Hubbard <br /> Staff Engineer Registered Geologist #4807 <br /> MMW EJH cb <br /> Copy to Mr Harlin Knoll, SJCPHS <br /> Ms Elizabeth Thayer, CVRWQCB <br /> MMsaos yrs <br /> WALLACE•KUHL <br /> Recydedpuper &ASSOCIATES INC <br />