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ARCO #6100 <br /> Page 2 <br /> With the addition of Section 25299.37.1 to the Health and Safety Code, this site <br /> both have been <br /> cannot be issued a closure letter unless the soil, groundwater <br /> tested for MTBE. Therefore, if the chromatograms exist from previous soil <br /> analysis, please have the laboratory evaluate whether MTBE was present in the <br /> sample. In addition, a water sample should be coollecte EPA methods and MTBE, <br /> ted from the on site well and <br /> analyzed for BTEX, TPH as gasoline using app p <br /> riaETRE, TAME, DIPE, and TBA using EPA method 8260. <br /> In addition, the following corrections or explanations should be addressed in an <br /> addendum to the October 12, 1998 report. On page 4 of the report the <br /> conversion factor should be corrected to read °a gallon of gasoline = 6.17 <br /> pounds". Also, the estimated TPHG Mass and Gallons TPHG on this page may <br /> need to be revised since Appendix B page 2 of the report requires further <br /> explanation and correction. Page 2 of Appendix B does not show how the <br /> volume and pounds of TPHG was calculated, that was subtracted from the total <br /> pounds of TPHG between 10 and 25 feet because of the UST excavation. An <br /> explanation for the volume and pounds subtracted from that interval because of <br /> the UST excavation should be provided. In addition, the total pounds of TPHG <br /> between 26 and 45 feet does not appear to be correct (40689 + 39970 + 2322 + <br /> 474 + 55 = 83510). The total mass of TPHG in pounds and gallons will probably <br /> change with the above required explanation and correction. <br /> ion 48 hours prior to <br /> surement of <br /> th <br /> Please <br /> ater and collection/of a water sample from the on site well so PHS/EHD staff <br /> to <br /> aff <br /> w <br /> may witness the activity. <br /> The results of the depth to water measurement, the results of the water sample <br /> analysis, the on site well log, any evaluation of MTBE in previously analyzed soil <br /> samples by the laboratory chemist, and the above discussed <br /> explanations/corrections to the October 12, 1998 report, should be submitted in <br /> an addendum to that report by August 16, 1999. <br /> If you have any questions contact me at (209) 468-3449. <br /> Donna Heran, REHS, Director <br /> Environmental Health Division <br /> Margaret Lag rio o, Supervising REHS <br /> Site Mitigation Unit <br /> c: Mark List — CVRWQCB <br /> Joel Coffman — Pinnacle <br />