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Mr Terry Tarditi <br /> January 30, 2006 <br /> Page 2 <br /> hydrocarbon-impacted groundwater extends horizontally from the former source <br /> area (4,000-gallon underground storage tank [UST]) to beyond the most southerly <br /> well (MW-3) Horizontal delineation is complete, however,vertical delineation is <br /> not complete in the vicinity of MW-1 <br />' Beginning remediation and mass removal will be the focus of activities in 2006, <br /> along with required quarterly groundwater monitoring <br /> tGROUNDWATER SAMPLE REQUIREMENTS <br /> Brown and Caldwell's Workplan for Quarterly Sampling of Monitoring Wells <br /> explains that each site monitoring well will be sampled and water levels will be <br /> measured quarterly In addition, the water supply well, located to the north of the <br /> tire shop,has been added to the quarterly sampling program A report <br /> summarizing these activities is due to PHS/EHD the month following the end of <br /> the previous quarter Samples are required to be analyzed for the following <br /> constituents total petroleum hydrocarbons as gasoline (TPH-g) by Environmental <br /> Protection Agency (EPA) method 8015 Modified, benzene, toluene, ethylbenzene, <br /> and xylene (BTEX), and oxygenates by EPA method 8260B PHS/EHD has also <br /> required 1,2-Dichloroethane (1,2-DCA) and 1,2-Dibromoethane (EDB) analysis <br /> by EPA 8260B <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 map for the second quarter Analytical results <br /> are presented for each well on Figure 3 A methyl-tertiary-butyl ether (MtBE) <br /> isoconcentration map is presented in Figure 4 Field data sheets from the <br />' November 2005 quarterly groundwater sampling event are included as <br /> • <br /> This rrpori;;w preparrd in accordance with the standards of the en:aronmenla!ronsult:rsg rndxstry al the time if near pmpartd It should not be <br /> irked upon by partes other than ibore for whom a aw prepared and then only to the exieni of the nape of work which waas aulhontird Tbss <br /> repmY doer notguarantee tbal no additional enirronmentol contamination beyond that dermbed in this report exisis at the site <br /> P\27000\127960 T&T Trucking GW Monitoring 2005\Reports\4th-05ytr doc <br />