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Mr Harlin Knoll <br /> May 9, 2000 <br /> Page 2 0£2 <br /> • q <br /> approved for storage of liquid waste by the Department of Transportation (DOT) pending <br /> P g <br /> disposal Copies of field purge logs and water level measurements are included in Attachment A <br /> Groundwater samples were submitted to Argon Laboratones (FLAP 92359) for analysis of TPHg <br /> and BTEX utilizing EPA methods 8015 modified and 8020, respectively Dissolved gasoline <br /> constituents were detected in wells MW1, MWS, and MW8 No dissolved contaminants were <br /> detected in wells MW3 or MW4 <br /> Well MW5 contained TPHg at 24,000 parts per billion (ppb) and benzene at 4,800 ppb, <br /> reductions of 7 7% to 18 6% from the previous quarter, and 85% to 87 4% from the lustonc <br /> highs recorded in the well (December 1996) MW 1 contained TPHg at 170 ppb, a reduction of <br /> 55 3% from last quarter and 98 5% from the histonc high for TPHg (January 1989), and benzene <br /> at 18 ppb, a reduction of 82% since last quarter and 99 8% from the historic high (June 1993) <br /> Well MW8 contained TPHg. at 68 ppb and benzene at 1 2 ppb MW8 has generally been non- <br /> detect since its installation in January 1990, with only five positive detections in 32 rounds of <br /> sampling However, low levels have been detected in two of the last three sampling rounds <br /> Analytical results are summanzed in Table 2 Laboratory data sheets and chain of custody <br /> documentation are included in Attachment B Attachment C contains graphical representations of <br /> TPHg and benzene concentrations over time in each site well <br /> WASTEWATER DISPOSAL <br /> Purged groundwater stored at the site was removed by American Valley Waste Oil, Inc on March <br /> 3, 2000 and transported to Seaport Environmental in Redwood City, California for disposal A <br /> copy of the manifest is included in Attachment D <br /> The next anticipated monitonng and sampling event is scheduled for May 2000 <br /> Please contact John Lane at (209) 838-9888 if you have any questions or comments regarding this <br /> submittal <br /> D GAO <br /> Sincerely, <br /> Ground Zero Analysis, Inc JONP <br /> LANE o <br /> No 6795 <br /> 71 Q <br /> P Lane <br /> CA Registered Geologist 6795 <br /> JPL <br /> Attachments <br /> cc Mr Carl Knowles <br /> Mr Patnck D Riddle, Esq <br /> CRWQCB Sacramento <br /> ]mowles haysheports/l gm2000 doc <br />