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C A M B R I A <br /> Comparing the groundwater analytical data from onsite boring CPT-1 to offsac (and <br /> downgradlent) boring CPT-3 shows petroleum hydrocarbon concentrations decline with <br /> distance away from the source area (the dispenser islands) This suggests natural attenuation <br /> of petroleum hydrocarbons may be occurring beneath the site, and since the source of the <br /> release has been remedied, it is likely the plume will stabilize begin to shrink <br /> RECOMMENDATIONS <br /> Arlm <br /> Cambria recommends an additional phase of CPT investigation at this site to further <br /> delineate the petroleum hydrocarbon impact We recommend investigating upgradlent of the <br /> source area to confirm that petroleum hydrocarbons found at depth during the recent <br /> investigation are derived from the former Texaco site and not from an offsite source We <br /> also recommend an additional boring downgradlent of CPT-3 and CPT-4, near MW-17 to <br /> delineate the downgradlent extent of petroleum hydrocarbons found at depth To further <br /> delineate the vertical extent of petroleum hydrocarbons near the source area, we recommend <br /> a deeper boring be advanced near the location of CPT-1 <br /> • Cambria will submit a work plan proposing the additional investigation activities outlined <br /> above to the SJCPHS-EHD for review and approval during the first quarter of 2001 <br /> If you have any questions regarding the contents of this document, please call Joe Neely at <br /> (707) 933-2361 <br /> Sincerely, <br /> Cambria Environmental Technology, Inc <br /> Scott Lewis <br /> Staff Geologist <br /> ,?�1rD Gco <br /> ar�O05�eH W <br /> Joe W Neely, RG <br /> Senior Project Geologist No 6927 <br /> RG 6927 <br /> 1399 6 <br />