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Ms Lori Duncan <br /> Page 3 of 3 <br /> �ir <br /> SUMMARY <br /> Groundwater levels and the direction of groundwater flow beneath the site were generally consistent <br /> with historical measurements An average of 0 88 feet of free product was measured in well MW3 <br /> during the reporting period Dissolved chloroform was present in wells MW2 and MW4 at <br /> concentrations below its MCL, and TCE and cis-1,2-DCE were present in well MW1 at <br /> concentrations below their respective MCLS PCE was present in wells MWl, MW2, and MW4 at <br /> concentrations ranging from 14 ppb to 16 ppb, which exceed the primary MCL of 5 0 ppb for PCE <br /> CONCLUSIONS <br /> Petroleum hydrocarbon contamination is apparent in groundwater within close proximity to the former <br /> UST, however, neither free product nor the dissolved petroleum hydrocarbon plume extends to <br /> perimeter wells Dissolved chloroform, TCE, and cis-1,2-DCE were detected in various wells at very <br /> low concentrations, below their respective MCLS, but PCE concentrations in groundwater remain <br /> above the primary MCL The perimeter wells are located approximately 20 feet southwest, 35 feet <br /> north, and 40 feet northeast of the former UST <br /> Ground Zero submitted a revised work plan dated September 6, 2002 for further delineation of <br /> contaminants in the groundwater and to conduct treatment feasibility testing The next monitoring and <br /> sampling event is scheduled for December 2002, which will include annual sampling of total <br /> petroleum hydrocarbons as gasoline (TPHg), total petroleum hydrocarbons as diesel (TPHd), and total <br /> recoverable petroleum hydrocaronbs (TRPH)/total oil and grease (TOG) Ground Zero will provide a <br /> minimum of 48 hours notice to EHD prior to conducting any fieldwork <br /> Please feel free to contact John Lane of Ground Zero at (209) 838-9888 if you have any questions <br /> regarding this submittal <br /> Respectfully, J <br /> Gro d Ze ysis, Inc <br /> D <br /> G� <br /> Sean Garvey a: JOHN P <br /> Staff Geologist 0 LANE o <br /> u' No 6796 <br /> rr <br /> •Yh <br /> Jo n P Lane ��OF <br /> CA Registered Geologist No 6795 <br /> Attachments <br /> cc Mr Gary Gabbard <br /> Mr Marty Hartzell, RWQCB-Central Valley Region <br /> Mr Patrick Riddle, Attorney at Law <br /> G1DatMGkOUNDZ$\GABBARDkeports�3QM2002 doe <br />