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t1 a <br /> CAMBRIA <br /> No existing water-supply wells, deeper aquifers, surface waters, or other receptors are threatened <br /> by pollutants remaining in the aquifer. No well survey has been completed for this site However, <br /> groundwater analytical results from the site monitoring wells indicate that fuel hydrocarbon <br /> concentrations in groundwater beneath the site are not substantial and do not threaten any potential <br /> sensitive receptors in the site vicinity Information from the State of California Geotracker database <br /> indicates the nearest municipal water supply well is farther than t/4-mile from this site <br /> The total pollutant mass remaining in the groundwater is decreasing at predicted rates and neither <br /> creates, nor threatens to create, a risk to human health and safety or future beneficial uses)of the <br /> aquifer As discussed above, no TPHg or benzene are currently present at detectable concentrations <br /> in groundwater samples collected from the site wells, and MTBE concentrations remain below 5 ppb <br /> Further, samples from the Exxon well east of the site contain 215 ppb TPHg and 0 60 ppb benzene <br /> (MTBE was not detected) These non-detect to low concentrations demonstrate that the mass <br /> remaining in groundwater does not pose a risk to human health and safety or future beneficial uses of <br /> the aquifer <br /> Based on Cambria's review of site conditions,the site satisfies the criteria for a low-risk fuel site On <br /> behalf of Shell, Cambria respectfully requests case closure A completed Appendix B checklist is <br /> presented in Attachment A <br /> CLOSING <br /> Thank you for your consideration of this matter Please call Aubrey Cool at(510)420-3336 if you <br /> have any questions or comments <br /> Sincerely, <br /> Cambria Environmental Technology, Inc. <br /> <,.�� <br /> �ED <br /> AubreyK Cool �� ANA <br /> GEO� <br /> Project Geologist FMEL D <br /> L <br /> c� <br /> Exp <br /> Ana Friel, (, be #6452 � <br /> Senior Project Geologist ATF y��Q <br /> . RG 6452 OF CALIF <br /> 0837 6 <br />