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. CAMBRIA <br /> site we would expect to detect them in the shallower soil, which they would have to migrate <br /> through to get to the groundwater Since they were not detected in the soil, their presence in the <br /> deep groundwater samples appears anomalous As stated previously, the absence of MTBE in <br /> soil and groundwater samples suggests the release at this site is old If this is an old release then <br /> we would not expect to find fuel oxygenates in the groundwater due to the release at this site <br /> Sensitive receptor survey results identified the closest well, a domestic well, as being <br /> approximately 600 feet east-southeast of the site at a mobile home park The screened interval <br /> for this well is 165 to 176 feet below grade, which is significantly deeper than the depth where <br /> gasoline constituents are detected beneath the subject site <br /> RECOMMENDATION <br /> Cambria recommends additional borings be drilled to delineate the lateral extent of petroleum <br /> hydrocarbons in groundwater northwest of the suspected source area Cambria also recommends <br /> installation of deep monitoring wells to monitor petroleum hydrocarbons in groundwater in the <br /> 70 to SO fbg depth range Cambria will prepare a work plan for the recommended additional <br /> • investigation and submit it to SJCPHSIEHD for approval <br /> CLOSING <br /> If you have any questions regarding the contents of this document, please call Joe Neely at (707) <br /> 933-2361 <br /> Sincerely, <br /> Cambria Environmental Technology, Inc <br /> k1SV'-'A � <br /> Geno Mammmi <br /> Staff Geologist <br /> D Gfp�O <br /> W NF C� <br /> klly� <br /> Joe W Neely, RG `rTe <br /> Senior Project Geologist <br /> RG 6927 No 6927 • <br /> OF CAUL <br /> I <br /> 0797 7 <br />