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� L <br /> Ms Lori Duncan <br /> ' Page 3 of 3 <br /> • contains laboratory reports and chain of custody documentation <br /> 4.0 SUMMARY <br /> Groundwater levels and the direction of groundwater flow beneath the site were generally consistent <br /> with historical measurements An average of 0 38 feet of free product was measured in well MW3 <br /> during the reporting period The product was bailed from the well on a weekly basis during the <br /> period <br /> Only PCE and chloroform were detected in groundwater samples collected from perimeter monitoring <br /> wells (MW1, MW2, MW4) Detected concentrations of chloroform remain well below the primary <br /> Maximum Contaminant Levels (MCL) of 80 ppb established by the State of California Department of <br /> Health Services However, PCE was present at levels ranging from 12-21 ppb, which exceeds the <br /> primary MCL of 5 0 ppb for PCE <br /> 5.0 CONCLUSIONS <br /> Petroleum hydrocarbon contamination is apparent in groundwater within close proximity to the <br /> former UST, however, neither free product nor the dissolved petroleum hydrocarbon plume extends <br /> to perimeter wells located approximately 20 feet southwest, 35 feet north, and 40 feet northeast of <br /> the former UST <br /> • Concentrations of PCE in groundwater samples collected from site wells have generally been <br /> decreasing since the wells were first sampled in December 2000 <br /> The next monitoring and sampling event is scheduled for June 2003 EHD will be notified at least 48 <br /> hours 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, p�ED GEO <br /> Ground Zero Analysis, Inc <br /> tt jOHN P <br /> e LANE P <br /> No 6795 <br /> John P Lane <br /> CA Registered Geologist No 6795 ATF D <br /> F C 1% . <br /> Attachments <br /> cc Mr Gary Gabbard <br /> Mr James L L Barton, RWQCB-Central Valley Region <br /> Mr Patrick Riddle, Attorney at Law <br /> G 1GROUNDZBIGABBARD\mpor[s12003V QM2003 doc <br />