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Mr Terry Tarditi <br /> February 3, 2005 <br /> Page 2 <br />' Beginning remediation and mass removal will be the focus of activities in 2005, <br /> along with required quarterly groundwater monitoring <br /> GROUNDWATER SAMPLE REQUIREMENTS <br />' BC's Workplan for Quarterly Sampling of Monitoring Wells explains that each site <br /> monitoring well will be sampled and water levels will be measured quarterly In <br />' addition, the water supply well, located to the north of the tire shop,has been <br /> added to the quarterly sampling program A report summarizing these activities is <br /> due to PHS/EHD the month following the end of the previous quarter Samples <br />' are required to be analyzed for the following constituents total petroleum <br /> hydrocarbons as gasoline (TPH-g) by Environmental Protection Agency (EPA) <br /> method 8015 Modified, benzene, toluene, ethylbenzene, and xylene (BTEC, and <br /> oxygenates by EPA method 8260B PHS/EHD has also required 1,2- <br /> Dichloroethane (1,2-DCA) and 1,2-Dibromoethane (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 /> ' Historical groundwater elevation data is summarized in Table 1 Table 2 <br /> summarizes groundwater flow direction and gradient Table 3 summarizes the <br /> historical analytical results for petroleum hydrocarbon constituents Figure 2 <br /> presents a groundwater elevation contour map for the second quarter Analytical <br /> ' results are presented for each well on Figure 3 A methyl-tertiary-butyl ether <br /> (MtBE) isoconcentration map is presented in Figure 4 Water level elevations for <br /> all four wells plotted over time are shown on Figure 5 Benzene and MtBE <br /> ' concentrations over time in MW-1 are shown on Figure 6 MtBE and water level <br /> elevations in MW-1 are shown on Figure 7 and historical MtBE concentrations in <br /> wells MW-2, MW-3, and MW-4 are shown on Figure 8 Field data sheets from the <br /> December 2004 quarterly groundwater sampling event are included as <br /> Attachment A Laboratory reports for the groundwater samples collected for <br /> these sampling events are included as Attachment B <br /> t Thu report am prrpamd rn accorrtann arth!h a standards of fhe enc rronmenta!rnnsulhng iridis rhy ai t/x bare:t oris pmpamd I1 should nol he <br /> rr&d upon ly partreJ other Au thane for whom it ausprepamd,and 11ko only to the extml of tlk snipe of a.nrk ahch ant ardhmnd Thu <br /> apart dors nolguamnlee 1,W no a"t"onal eammnmenlal conlamtnalron beyond That desnrhed rn thu rrport exists al the We <br /> ' P\21000\21417-T&T\Reports\4th-04gtr doc <br />