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n �y <br /> *CAM B R [ A <br /> is unlikely that the MTBE detected in this well originated from the subject site Samples from <br /> well MW-8 have contained sporadic, low-level MTBE detections (0 54 to 22 ppb) As there <br /> have not been corresponding MTBE detections in well MW-5, the source area well, these <br /> detections may also be attributed to an offsite source There is one former fuel station and one <br /> operating fuel station located north of the subject site <br /> Cambria sampled the deeper water zone at this site in November 2001 The sample collected at <br /> 88-92 feet below grade did not contain detectable concentrations of petroleum hydrocarbons or <br /> fuel oxygenates,demonstrating that deeper groundwater beneath the site has not been impacted <br /> Based on these results,Cambria concludes that the documented petroleum hydrocarbon impact to <br /> the environment that occurred during Shell's tenure as lease holder of the subject location has <br /> been effectively mitigated and does not pose a threat to human health nor the environment, and <br /> recommends that the site be reviewed for case closure As discussed above, the existing <br /> groundwater monitoring wells will continue to be sampled quarterly <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 /> Aubrey K Cool <br /> Project Geologist <br /> W EOl <br /> M4O <br /> ��c,o��e HFF`��s <br /> a <br /> Joe W Neely,RG -4 <br /> Senior Project Geologist <br /> RG 6927 p No 6927 ' <br /> SOF CAUL <br /> • <br /> 1346 3 <br />