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r <br /> Tosco-76/former BP#11192 <br /> 1403 Country Club Blvd, Stockton. <br /> Page 3 of 3 <br /> EHD will issue the well installation permits for both onsite and offsite monitoring well installations if you <br /> desire but cautions that any onsite deeper MtBE or other petroleum contamination detected in the <br /> required vertical delineation investigation will have to be laterally delineated also. Rather than drill offsite <br /> now to only 80' bgs as proposed, you may want to consider postponing the offsite investigation until the <br /> onsite vertical investigation demonstrates whether deeper offsite wells are needed. If even deeper wells <br /> are needed, the offsite monitoring well installations could target all depths of concern under one <br /> mobilization and city set of permits. <br /> Please advise EHD of your decision to either modify the work plan portion of the CAP and consider the <br /> ozone sparge portion as an interim action, or to go ahead with the monitoring well installations as <br /> submitted. Although you may install the sparge points and operate the system as an interim measure, <br /> activating the system as a full, final corrective action (chosen alternative) is not approved at this time. <br /> The work plan proposes reporting the remediation system data semiannually.While a semiannual review <br /> of the system performance is acceptable, all analytical data collected each quarter should be reported in <br /> the quarterly reports. <br /> EHD has received an incomplete quarterly monitoring report on behalf of BP Oil Company(BP)from <br /> Cambria Environmental Technology, dated April 5, 2002. Only monitoring well data from MW-1 and MW-3 <br /> thru MW-7 were included in the report. If BP is planning on submitting QMRs also, please include <br /> groundwater data from all of the monitoring wells installed for this site investigation (MW-8, 9, 10, and 11 <br /> also). It is unclear to EHD why BP is submitting reports since EHD was advised that TOSCO has claimed <br /> responsibility for the entire site investigation, monitoring, and cleanup. An explanation from BP for the <br /> reporting and added costs associated with the duplicated sampling, report generation, and EHD <br /> review and commenting would be appreciated. <br /> Please continue to mail your correspondence to Michael Infurna and you may phone him at(209) <br /> 468-3454 should you have any questions or wish to discuss the site. Mr. Infurna also can be reached by <br /> electronic mail at minfurna(d1sicehd.com. <br /> Donna Heran, REHS, Director <br /> Environmental Healt ivisi n <br /> AJ. lnfurna Jr., enior S Nuel C. Henderson, Jr., R.G. <br /> SSite Mitigation Unit{V/LOP <br /> Site Mitigation Unit IV/LOP <br /> cc: Gettler Ryan—Dave Vossler 1364 N. McDowell Blvd, Ste B-2, Petaluma, 94954. <br /> CVRWQCB—Marty Hartzell, Sacramento. <br /> SWRCB-CUF— Mark Owens, Sacramento <br />