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C A M B R I A <br />0 <br />• <br />RECOMMENDATIONS <br />Groundwater samples from all wells have been analyzed for ethylene dibromide and <br />1,2-dichloroethane for one hydrologic cycle, and none have been detected in any of the wells <br />Therefore, Cambria recommends that these analyses be discontinued In our SCM mentioned <br />above, Cambria recommended reducing the sampling frequency of wells MW -1 through MW -6 <br />and MW -10 to annual We will implement these changes with SJCEHD's concurrence beginning <br />with the first quarter 2005 sampling event <br />Cambria also recommended drilling four additional cone penetration test borings in our <br />October 7, 2004 SCM If SJCEHD concurs with this recommendation, we will submit a work <br />plan further detailing these activities <br />HISTORICAL REMEDIATION SUMMARY <br />A soil vapor extraction (SVE) system operated at this site from September 1992 to <br />November 1996 During this time, the SVE system removed approximately 17,628 pounds of <br />vapor phase total petroleum hydrocarbons as gasoline from the subsurface <br />CLOSING <br />If you have any questions regarding the contents of this document, please call Aubrey Cool at <br />(510) 420-3336 <br />Sincerely, <br />Cambria Environmental Technology, Inc <br />VANA"K',, .�ERED G f0 <br />S <br />Aubrey K Cool, RG �e. gR Y k c �0 <br />Project Geologist QJ dor <br />RG 7659 <br />NO 7659 <br />OF CAI %* / <br />0778 2 <br />