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� y <br /> CAIr B 'RIA <br /> Blaine will gauge and sample the site wells per the existing sampling schedule and tabulate the <br /> data Cambria will prepare a groundwater monitoring report <br /> CONCLUSIONS AND RECOMMENDATIONS <br /> The analytical results of groundwater samples collected this quarter were generally within the <br /> historical norm for this site One exception to this is an increase in the methyl tertiary butyl ether <br /> (MTBE) concentration in well MW-14, which is located southwest of the subject site Based on <br /> prevailing groundwater flow direction and the fact that MTBE is not detected in wells MW-6 and <br /> MW-2, which are located in the southwest corner of the subject site, it appears that the MTBE in <br /> At MW-14 may originate from an offsite source The groundwater flow direction in the shallow <br /> zone is generally to the east at a gradient ranging from 0 001 to 0 006 <br /> The laboratory report notes that where total petroleum hydrocarbon as diesel (TPHd) was <br /> detected, that the chromatogram does not match the labs diesel standard Therefore these TPHd <br /> detections may be anomalous <br /> Groundwater flow directions in the 80- and 120-foot zones during the second quarter 2004 were <br /> generally toward the south, at an approximate hydraulic gradient of 0 005 The vertical gradient <br /> was downward this quarter, between the 80-and 120-foot zones and upward between the shallow <br /> zone and the 80-foot zone, specifically in the vicinity of the NfW-11 well cluster <br /> CLOSING <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 /> Vu-Lisa Summers <br /> Staff Scientist <br /> \5� ?,eD GEfl`O <br /> <cO S�eH W <br /> Joe W Neely, RG <br /> Senior Project Geologist ° No 6927 <br /> • RG 6927 <br /> �OF CALIF-O� <br /> 1399 2 <br />