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Mr Terry Tarditi <br /> April 7, 2003 <br /> Page 2 <br /> Groundwater Sample Regiurements <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 UFT oxygenates by EPA method <br /> 8260B PHS/EHD has also required 12 DCA and EDB analysis <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 /> Cahforma (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 (1 st qtr) 66 48 feet <br /> Average change in shallow groundwater <br /> elevation from previous quarter (4th qtr) 3 42 feet <br /> Field data sheets from the February 2003 quarterly groundwater sampling events <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 these sampling events are included as Attachment B <br /> Discussion <br /> Based on the first quarter's data, the groundwater hydraulic gradient remains <br /> basically flat, as shown in Figure 2 <br /> Tia r rrpor!as r prrpaerd en aarordanrx anlh 11x rlundardr of!lx cnrrranmcnlu!roruuQrn�urdxrfry a!fix t:frx u a vt prcpand 11 slhnnld no!be <br /> rrhed upan 6y parlrer olher lhan!hare far wham it xwrpreparrd,and lixn only!011x extent f 1hr snipe of amwk w&rh axr aulhorrlyd 77nr <br /> irporr doer noigaarantce that no additional enirmamenial mniamrnal:on&Ynd liar,de robed in 1hr r npoty twin at 41x stir <br /> P\21(M\21417\Rcport1\1 st-03gtr doc <br />