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Ms Lori Duncan <br /> Page 3 of 3 <br /> . MW2, or MW4 An average of 0 96 feet of floating product was measured in well MW3, however <br /> PCE was again detected in site perimeter wells Concentrations of PCE during this event ranged from <br /> 17-19 ppb, which exceed the Maximum Contaminant Level(MCL) of 5 0 ppb <br /> CONCLUSIONS <br /> Petroleum hydrocarbon contamination is apparent the groundwater in the immediate vicinity of the <br /> former UST Neither free product nor the dissolved petroleum hydrocarbon plume extend to perimeter <br /> wells however, which are located approximately 20 feet southwest, 35 feet north, and 40 feet northeast <br /> of the former UST PCE concentrations in groundwater remain above the MCL in site wells, <br /> although concentrations appear to be decreasing <br /> RECOMMENDATIONS <br /> Based upon the groundwater data collected to date, Ground Zero recommends continuing periodic <br /> removal of floating product from well MW3 and periodic monitoring and sampling of site perimeter <br /> wells However, Ground Zero recommends discontinuing analysis of groundwater samples for the <br /> presence of total lead based upon historical non-detect results In addition, due to the relatively high <br /> detection limit inherent in the TRPH analytical method (1,000-10,000 ppb), Ground Zero recommends <br /> . discontinuing TRPH analysis in groundwater samples collected from site perimeter Groundwater <br /> samples collected from well MW3 will still be analyzed for TRPH <br /> Please feel free to contact John Lane of Ground Zero at (209) 838-9888 if you have any questions <br /> regarding this subrruttal <br /> Respectfully, <br /> Ground Zero Analysis, Inc ' <br /> 1 ED GEp�o <br /> Sean Garve � jON!'JP � <br /> y� LANE e <br /> Staff Geologist No 6795 <br /> John P Lane <br /> CA Registered Geologist No 6795 <br /> Attachments <br /> cc Mr Gary Gabbard <br /> Mr Patrick Riddle, Attorney at Law <br /> Mr Marty Hartzell, RWQCB-Central Valley Region <br /> G 1Data1GROUNDZEIGABBARDIreports\3QM2001 dog <br />