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" CANIBRIA <br /> MW-5 and MW-7 at concentrations ranging from 12 to 170 ppb This investigation is described <br /> in Cambria's November 11, 1997 Site Investigation Report/Quarterly Monitoring Report -- <br /> Fourth Quarter 1997 <br /> Based on these data and quarterly monitoring events, SJCPHS/EHD requested that additional <br /> onsite and offsite investigations be completed to assess the vertical and honzontal extents of <br /> petroleum hydrocarbons and MTBE ongmating at the subject site The results of these <br /> investigations are presented below <br /> INVESTIGATION RESULTS <br /> Personnel Present Cambna geologists Scott Lewis and Aubrey Cool directed the <br /> field sampling, working under the supervision of California <br /> Registered Geologist Joe Neely <br /> Permits Permits numbered 0022825, 0025419, and 0025420 were <br /> obtained from SJCPHSIEHD (Appendix A) <br /> i <br /> Drilling Companies Gregg Dnlling, Inc and Gregg InSitu (Gregg) of Martinez, <br /> California (C57 License Nos 485165 and 656407) <br /> Drilling Dates• May 23 through 25, 2000 and November 5, 2001 <br /> Drilling Methods Cone penetration test(CPT) and 8-inch hollow-stem augers <br /> Soil Sampling Methods• Soil lithology in borings S13-5 and S13-6 was logged <br /> continuously using electronic CPT equipment, and soil lithology <br /> in well borings MW-10 and MW-11 was logged at 5-foot <br /> intervals using the Unified Soil Classification System and <br /> Munsell Color Charts The electronic CPT soil logs are <br /> presented in Gregg's report (Appendix B) Encountered <br /> lithology in well borings MW-10 and MW-11 is described on <br /> the exploratory bonng logs presented in Appendix C Soil <br /> samples were collected at 5- or 10-foot intervals for potential <br /> chenucal analysis and headspace analysis Soil samples from <br /> each interval were screened for the presence of organic vapors <br /> • using a photo-ionization detector (PID) PID readings from <br /> 0854 3 <br />