Laserfiche WebLink
rt � <br /> Ms Lori Duncan <br /> Page 3 of 3 <br /> . reports and chain of custody documentation <br /> SUMMARY <br /> Groundwater levels and the direction of groundwater flow beneath the site were generally consistent with <br /> historical measurements An average of 0 45 feet of free product was measured in well MW3 during <br /> the reporting period No petroleum hydrocarbon constituents have been detected in any of the other site <br /> wells (MWI, MW2, and MW4) However, PCE and chloroform were detected in well MW1, MW2, <br /> and MW4 The concentrations of PCE in groundwater samples collected during this sampling event <br /> ranged from 17 ppb to 20 ppb, which exceed the primary MCL of 5 0 ppb <br /> CONCLUSIONS AND RECOMMENDATIONS <br /> Petroleum hydrocarbon contamination is apparent in groundwater within close proximity to the former <br /> UST Neither free product nor the dissolved petroleum hydrocarbon plume extends to perimeter wells, <br /> however The perimeter wells are located approximately 20 feet southwest, 35 feet north, and 40 feet <br /> northeast of the former UST PCE concentrations in groundwater remain above the primary MCL <br /> The next monitoring and sampling event is scheduled for September 2002 Ground Zero will provide a <br /> minimum of 48 hours notice to EHD prior to conducting any fieldwork A revised work plan for <br /> further delineation of contaminants in the groundwater and to conduct treatment feasibility testing is <br /> being prepared by Ground Zero and will be submitted under separate cover <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 /> ED GFO <br /> Respectfully, ) <br /> Ground Zero Analysis, Inc <br /> JOHN P <br /> LANE <br /> r o <br /> N No 6795 <br /> John P Lane "sj� o� <br /> CA Registered Geologist No 5795 Or C �-�� <br /> Attachments <br /> cc Mr Gary Gabbard <br /> Mr Marty Hartzell, RWQCB-Central Valley Region <br /> Mr Patrick Riddle, Attorney at Law <br /> G(Data\GROUNDZEIGABBARDIrepom\2QM2002 doc <br />