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a <br /> Mr Terry Tarditi <br /> . January 23, 2003 <br /> Page 2 <br /> A workplan for the soil and groundwater delineation is due to the PHS/EHD no <br /> later than February 21, 2003 Results of the sensitive receptor identification are <br /> due April 3, 2003 <br /> Groundwater Sample Requirements <br /> BC's Workplan for Quarterly Sampling of Monitoring Wells describes that all wells <br /> will be sampled and water levels measured quarterly Qanuary,April,July and <br /> October) In addition, the water supply well will be added to the quarterly <br /> sampling A report summarizing these activities is due to PHS/EHD the month <br /> following the end of the previous quarter (April,July, October, and January) <br /> Samples are required to be analyzed for the following constituents total petroleum <br /> hydrocarbons as gasoline (TPH-G), by EPA method 8015 Modified, benzene, <br /> toluene, ethylbenzene, and xylene (BTEX), and LUFT oxygenates by EPA method <br /> 8260B PHS/EHD has also required 1 2 DCA and EDB analysis for future <br /> sampling events <br /> . Groundwater Disposal <br /> Purge water from flus 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 Toxic Substances <br /> Control Certification No 2336) <br /> Sample exceptions None <br /> Shallow groundwater gradient Flat <br /> Shallow groundwater flow direction Flat <br /> Average depth-to-water (4th qtr) 69 90 feet <br /> Average change in shallow groundwater <br /> elevation from previous quarter(3rd qtr) 0 84 feet <br /> Field data sheets from the November 2002 quarterly groundwater sampling events <br /> are included as Attachment A Historical groundwater elevation data is <br /> summarized iii Table 1 Table 2 summarizes groundwater flow direction and <br /> gradient Table 3 summarizes the historical analytical results for petroleum <br /> \\Bcsac0l\Aroiects\21000\21417\Repons\Ftnal 4th 02gtr doc <br />