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'1 Mr Terry Tarditi <br /> December 17, 2001 <br /> Page 2 <br /> DEC 1 9 2001 <br /> ENVIRONMENTAL HEALTH <br /> Groundwater Sample Requirements: PERMIT/SERVICES <br /> BC's Workplan for Quarterly Sampling of Monitoring Wells describes that all <br /> wells will be sampled and water levels measured quarterly Uanuary, April, <br /> July and October) A report summarizing these activities is due to PHS/EHD <br /> the month following the end of the previous quarter (April,July, October, and <br /> January) Samples are required to be analyzed for the following constituents <br /> total petroleum hydrocarbons as gasoline (TPH-G), by EPA method 8015 <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 by T&T Trucking, Inc <br /> . Quarterly Results Summary: <br /> Analytical laboratory Kiff Analytical, Inc , Davis, <br /> California (California <br /> Department of Health Services <br /> Certification No 2336) <br /> Sample exceptions None <br /> Shallow groundwater gradient 00018 <br /> Shallow groundwater flow direction Northeast <br /> Average depth-to-water 68 21 feet <br /> Average change in shallow groundwater <br /> elevation from previous quarter 0 66 feet <br /> Field data sheets from the October 2001 quarterly 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 /> • This report was prepared in accordance with the standards of the environmental consulting industry at the time it was <br /> prepared It should not be relied upon by parties other than those for whom it was prepared,and then only to the extent of <br /> the scope of work which was authomed Thu report does not guarantee that no additional environmental contamination <br /> beyond that described in this report exists at the site <br /> P\21000\21417\Reports\4th-0lgtr doe <br />