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i <br /> iMr Terry Tarditr <br /> July 15, 2003 <br /> Page 2 <br />' A sensitive receptor survey required by the PHS/EHD was submitted to the <br /> PHS/EHD on April 14, 2003 <br />' A subsurface soil and groundwater investigation is in progress <br /> iGroundwater Sample Requirements <br />' BC's Workplan for Quarterly Sampling of Monitoring Wells describes that all well,; <br /> ,vill be sampled and water levels measured quarterly oanuary,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 /> ihydrocarbons as gasoline (TPH-G), by EPA method 8015 Modified, benzene, <br /> toluene, ethvlbenzene, and xvlene (BTEX�, and UFT oxygenates by EPA method <br /> 8260B PHS/EHD has also required 1 2 DCA and EDB analysis <br /> Groundwater Disposal <br /> Purge water from this sampling event waslaced into drums and disposed P p of <br /> properly by T&T Trucking, Inc <br /> Quarterly Results Summary_ <br />' Analyticallaborato r <br /> � 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 (2nd qtr) 65 36 feet <br />' Average change in shallow groundwater <br /> elevation from previous quarter (1 st qtr) 1 12 feet <br />' Field data sheets from the May 2003 quarterly groundwater sampling events are <br /> included as Attachment A Historical groundwater elevation data is summarized in <br /> Table 1 Table 2 summarizes groundwater flow duecuon and gradient Table 3 <br />' P\21000\21417\Reports\2nd 039tr doc <br />