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,&CAMBRIA <br /> Drilling activities are performed to accordance with industry standards and all efforts are made to <br /> avoid cross-contamination of samples during drilling activities However, it is possible that the <br /> low level MTBE concentrations detected in the deeper groundwater samples collected from the <br /> 6v, � <br /> borings are due to impacted shallow groundwater mixing with deeper groundwater during <br /> drilling activities <br /> RECOMMENDATIONS <br /> Cambria recommends installing additional groundwater monttonng wells to further assess the <br /> lateral extent of fuel oxygenates in groundwater south, west, and northwest of the subject site <br /> As requested in SJCPHS/EHD's March 22, 2002 letter, Cambria will prepare a work plan for the <br /> recommended additional investigation and submit it to SJCPHS/EHD for approval by <br /> June 5,2002 <br /> CLOSING <br /> If you have any questions regarding the contents of this document, please call Aubrey Cool at <br /> (707)933-2368 <br /> Sincerely, <br /> Cambria Environmental Technology, Inc. <br /> Geno Mammim <br /> Staff Geologist <br /> ,��RtD GEO� <br /> Joe W Neely,RG \S H W O <br /> Senior Project Geologist <br /> RG 6927 <br /> ° No 6927 <br /> \Q` <br /> OF CAUL <br /> 0955 7 <br />