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4707 Pacific Avenue <br /> August 1997 <br /> Page 2 <br /> Please note that the Table 1 Summary of VES Chemical Analytical Data included within the"First <br /> Quarter 1997 VES Report" erroneously indicated that<0.10 mg/m3 xylenes was detected rather than <br /> 0.48 mg/m3 xylene which the accompanying laboratory report indicated. Please correct the table so that <br /> subsequent VES reports will accurately reflect the true analytical result. This report also noted that <br /> various components of the system required replacement and once the system became operational,that the <br /> system would be monitored every two weeks. The system was reportedly restarted on April 24, 1997. <br /> Please provide PHS/EHD notice prior to the next monitoring event so that a PHS/EHD inspection of the <br /> system may be scheduled. <br /> As you are aware,oxygenates have been used in gasoline products throughout the state. The Central Valley <br /> Regional Water Quality Control Board in consultation with the Department of Health Services has issued a <br /> directive dated July 18, 1997 which requires the analysis of water samples using EPA Method 8260. The <br /> GC/MS scan should include at minimum the following oxygenates: Methanol,Ethanol,Tertiary Butanol, <br /> Methyl Tertiary Butyl Ether,Di-Isopropyl Ether(DIPE),Ethyl Tertiary Butyl Ether(ETBE),and Tertiary <br /> Amyl Methyl Ether(TAME). I have included a copy of the directive dated July 18, 1997 for your information. <br /> Until directed otherwise,all water samples collected shall undergo EPA Method 8260 analysis in addition to <br /> EPA Method 8020 and EPA Method 8015M analyses. <br /> Please forward the second quarter groundwater monitoring report immediately. The third quarter monitoring <br /> report,which will include the July 16, 1997 sampling results,should be forwarded as soon as it becomes <br /> available,so that PHS/EHD may have access to the information prior to reviewing the work plan that is due <br /> September 12, 1997. <br /> I look forward to working with you,as the new TOSCO Project Manger. If you have any questions,comments <br /> or to schedule a field inspection,please contact me at(209)468-0337. <br /> Donna Heran, RENS, Director <br /> Environmental Health Division <br /> Mary Meays, Senior REHS Margar Lagorio,REI <br /> Site Mitigation Unit Supervisor <br /> enclosure: CVRWQCB directive dated July 18, 1997 <br /> cc: Elizabeth Thayer, Central Valley Regional Water Quality Control Board <br /> cc: David Irey, San Joaquin County Deputy District Attorney, Environmental Prosecutions Unit <br /> cc: Greg Gurss,GeoStrategies <br /> cc: Haig, Tejirian, MPDS <br />