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• �� _1�f <br /> Mr Terry Tardutt <br /> October 2, 2002 <br /> Page 2 020C_ —e AN S 4 , <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) 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 (BTEN, and oxygenates by EPA method <br /> 8260B <br /> Groundwater Disposal <br /> Purge water from thus 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 (both gtrs) Flat <br /> Shallow groundwater flow direction (both gtrs) Flat <br /> Average depth-to-water (2nd qtr) 67 62 feet <br /> Average depth-to-water (3rd qtr) 70 74 feet <br /> Average change in shallow groundwater <br /> elevation from previous quarter (2nd qtr) -3 51 feet <br /> Average cumulative change in shallow <br /> groundwater elevation from first quarter -6 63 feet <br /> Field data sheets from the June and August 2002 quarterly groundwater sampling <br /> events 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 /> Thts report was prepared rn accordance oath the standards of the entaronmental ronsulttng industry at the time it aw prepared It should not be <br /> relied upon by parties other than those for whom it rias prepared,and then on#to the extent of the scope of work whtrh mus authorrZed Thos <br /> report does not guarantee that no additional encaronmental rontamsnatsan bryond that desmbed to this report exists at the site <br /> \\Bcsac02\projects\21006\21417\Reports\2ndan4-rd 02gtr doe <br />