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• Mr Don Rodgers Project 2613-100 003 August 18, 1998 Page 3 the oxygenates tertiary butanol, MTBE, di-isopropyl ether (DIPS), ethyl tertiary butanol ether (ETBE), and tertiary amyl methyl ether (TAME) using USEPA Method 8260 Copies of the chain-of-custody records and laboratory analysis reports are presented in Appendix C The results of laboratory analyses indicated that dissolved hydrocarbons were present in the monitoring well TPHG and benzene were detected at concentrations of 4,810 ppb and 629 ppb, respectively MTBE was below laboratory detection limits using USEPA Method 8020 and was detected at a concentration of 013 ppb using USEPA Method 8260 The oxygenates tertiary butanol, DIPE, ETBE, and TAME were below laboratory detection limits Results of laboratory analyses are presented in the table CONCLUSIONS Analytical results of petroleum hydrocarbons were generally consistent with previous sampling events Groundwater elevation increased 100 foot from the previous sampling event(March 1998) Pinnacle will continue to perform quarterly groundwater sampling The next sampling event is scheduled for August 1998 Please call if you have questions regarding this report or any aspect of the project Sincerely, Pinnacle Mark Capps Jay R Johnson Project Geologist Senior Project Supervisor R G 6561 R G 5867 Attachments Table 1 Groundwater Monitoring Data Figure 1 Site Location Map Figure 2 Generalized Site Plan Appendix A Groundwater Monitoring Field Data Sheets Appendix B Sampling and Analysis Procedures Appendix C Chain-of-Custody Records and Laboratory Analysis Reports cc Ron Rowe, San Joaquin County Public Health Services Elizabeth Thayer, California Regional Water Quality Control Board California UST Cleanup Fund Program SAC\A\RODGERS QM2-981mtt 1 P[.cM411i & Rev d,August 18,1998