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1. <br /> Mr Terry Tarditi <br /> March 14, 2001 <br /> . Page 2 <br /> Modified, benzene, toluene, ethylbenzene, and xylene (BTEX), and oxygenates <br /> by EPA method 8260B <br /> Groundwater Disposal: <br /> Purge water from this sampling event was placed into drums and disposed of <br /> properly <br /> Quarterly Results Summary: <br /> Analytical laboratory Klff Analytical, Inc , Davis, <br /> California (California <br /> Department of Health Services <br /> Certification No 2336) <br /> Sample exceptions None <br /> Shallow groundwatergradient Not calculated <br /> Shallow groundwater flow direction Radial <br /> Average depth-to-water 66 21 feet <br /> Average change in shallow groundwater elevation <br /> from previous quarter 0 13 feet increase <br /> Field data sheets from the October 2000quarterly groundwater sampling event <br /> are included as Attachment A Historical groundwater elevation data is <br /> summarized in Table 1 Table 2 summarizes groundwater flow direction and <br /> gradient Table 3 summarizes the historical analytical results for petroleum <br /> hydrocarbon constituents Laboratory reports for the groundwater samples <br /> collected for this sampling event are included as Attachment B A comparison <br /> of last quarter's groundwater analytical results with this quarter's sampling <br /> results is summarized below in Table 4 <br /> Table 4. Comparison of Groundwater Analytical Results with Previous <br /> SamplingEvent <br /> TPH-G Benzene MTBE 8260 B <br /> 3rd gtr,00 4th qtr,00 3rd qtr,00 4th qtr,00 3rd qtr,00 1 4th qt,,00 <br /> Ht hest concentration, (pg/L 1,500 1,400 460 320 3,000 1,900 <br /> Well with highest MW-3 MW-3 MW-3 MW-3 MW-1 MW-1 <br /> concentration <br /> Number of wells with 3/4 2/4 3/4 3/4 4/4 3/4 <br /> detection <br /> Discussion: <br /> Based on this quarter's data, groundwater flows in an apparent radial direction <br /> from MW-1 Benzene concentrations decreased in well MW-1, MW-3, and <br /> • MW-4 from the previous quarter, and were not detected in the groundwater <br /> sample from MW-2 Toluene, ethylbenzene, and total xylenes concentrations <br /> remained consistent with the previous quarter's results In all the wells <br /> Use or disclosure of data continued on this sheet is subject to the restrsctton spewed at the begtnntng of this document <br /> 03/1V01P\16000\16271\Reports\4tb00gtr doc <br />