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Ar <br /> Mr Terry Tarditi <br /> iJuly 12, 2005 <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 (I11W-3) Horizontal delineation is complete, however,vertical delineation is <br /> not complete in the vicinity of MWA <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 (13TEX), and <br /> oxygenates by EPA method 8260B PHS/EHD has also required <br /> 1,2-Dichloroethane (1,2-DCA) and 1,2-Dibromoethane (EDB) analysis by <br /> 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 /> June 2005 quarterly groundwater sampling event are included as Attachment A <br /> Thtr report war prepared in a Aordanrr atdi the tandardr q1the enrrronmental rota rulGng rndurtr)at de time if wur prrpared 11 rhould not be <br /> rrIted upon b)parYte r atter Man Chore for whom if war prrpared and then onh to the e-,tent of lle mope of work chub war authorr;rd 7 her <br /> report doe,nal guarantee thal no additional enumnmental eontamrnatton lx)ood Cha!dew7bed in tlxr repotY e%7rtr at the file <br /> P\27(x)0\127960 T& F i rucking;GW Nfomtonng 2005\RLPort%\?nd-05ytr doc <br />