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lti� fi <br /> Ms Lon Duncan <br /> . April 12,2001 <br /> Page 6 of 6 <br /> appear to extend more than approximately 40 feet downgradnent from the source PCE <br /> concentrations were fairly uniform in groundwater samples collected from site monitoring wells, <br /> but was not detected in "grab" groundwater samples collected from soil bonngs previously drilled <br /> at the site <br /> 6.0 RECOMMENDATIONS <br /> Ground Zero recommends collecting additional groundwater samples from site monitoring wells <br /> to confirm initial analytical results, groundwater flow and gradient, and variations in water levels <br /> In addition, an investigation of potential off site sources of dissolved PCE contamination should <br /> be conducted <br /> Please feel free to call John Lane of Ground Zero at (209) 838-9888 if you have any questions <br /> regarding this submittal <br /> Respectfully, <br /> Ground Zero Analysis, Inc <br /> cw� D GEo <br /> Sean Garvey, <br /> .' <br /> Staff Geologist <br /> JOHN P <br /> d �} o LA"I4c o <br /> Na 6795 <br /> Q <br /> John P Lane <br /> CA Registered Geologist No 6795 OF CA1-Ike <br /> Attachments <br /> cc Mr Gary Gabbard <br /> Mr Patrick Riddle, Attorney at Law <br /> Mr Marty Hartzell, RWQCB-Central Valley Region <br /> G1Data1GROUNDZEIGAB13ARDWports\WELLUT doc <br />