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. petroleum hydrocarbons (TPH-g) by EPA method 8015 modified for gasoline, and for oxygenates <br /> J by EPA method 8260 <br /> TPH-g, benzene, and MTBE concentrations appear in Table 1 and Appendix B The TPH-g, <br /> benzene, and MTBE isoconcentration maps are presented in Figures 2, 3, and 4. The only <br /> detectable concentrations of TPH-g,benzene, and MTBE were found in well MW-11 (28,000 ug/L, <br /> 4,700 ug/L,and 1,200 ug/L,respectively) None of the other wells had any detectable hydrocarbons <br /> Since the third quarter of 1997, Thrifty has analyzed for the requested oxygenates di-isopropyl <br /> ether, ethanol, ethyl-tert butyl ethyl,methanol,tert-amyl methyl ether,tert-butanol, and methyl tert- <br /> butyl ether(MTBE) by method 8260 Results above detection limits were detected in monitoring <br /> well MW-11 for methanol at 7,900 ug/L, MTBE at 1,200 ug/L, and tert-butanol at 2,100 ug/L <br /> These analytical laboratory results are presented in Appendix A <br /> Summary and Recommendations <br /> On December 7, 1999, the San Joaquin County Public Health Services, Environmental Health <br /> Division(PHS/EHD) approved Thnfty's Corrective Action Plan((CAP), August 18, 1999) for this <br /> site On December 15, 1999, Mr Michael Infurna Jr of the PHS/EHD inspected the site for all on <br /> and off site well head boxes to meet the standard required by the PHS/EHD, a letter confirming this <br /> inspection (with approval stamp by PHS/EHD) is enclosed in Appendix C <br /> Thrifty has met two of the three remaining requirements (CAP approval and successful well head <br /> inspection) for this site to be in compliance, the only item left is that the system need to be installed <br /> and running according to Mr Infurna's letter of December 7, 1999 (Appendix D) Thrifty is in the <br /> process of obtaining the proper permits, and bids for the system installation <br /> Thrifty will continue quarterly groundwater monrtonng, gauging, purging and sampling of all <br /> groundwater monitoring wells <br /> All interpretations expressed in this report are based upon review of data collected by EMC <br /> Written by Reviewed by <br /> ED GEO� <br /> 3 <br /> - 197 <br /> Ra and C Friednchsen, REA II Larry fliginbotham. y� 04130 Q2� <br /> 0 <br /> Project Manager Registered Geologist <br /> Senior Hydrogeologist <br />