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Mr Terry Tardlti <br /> August 19, 2004 <br /> Page 2 <br /> STATUS OF INVESTIGATION AND CLEANUP ACTIVITIES <br />' Four groundwater monitoring wells have been installed at the site, as shown in <br /> Figure 1 Quarterly groundwater monitoring has been ongoing since 1998 <br />' Previous groundwater monitoring results indicate hydrocarbon-impacted <br /> groundwater extends from the former source area (4,000-gallon underground <br /> storage tank [USTI) to beyond the most southerly well (MW-3) <br />' GROUNDWATER SAMPLE REQUIREMENTS <br /> iBC's Workplan for Quarterly Sampling of Monitoring Wells explains that each site <br /> momtonng well will be sampled and water levels will be measured quarterly <br /> Oanuary, April,July, and October) In addition, the water supply well,located to <br /> the north of the tare shop, has been added to the quarterly sampling program A <br /> report summarizing these activities is due to PHS/EHD the month following the <br /> end of the previous quarter (April,July, October, and January) Samples are <br /> required to be analyzed for the following constituents total petroleum <br /> hydrocarbons as gasoline (I'PH-g) by Environmental Protection Agency (EPA) <br /> method 8015 Modified, benzene, toluene, ethylbenzene, and xylene (BTEX�, and <br /> oxygenates by EPA method 8260B PHS/EHD has also required 1,2-DCA and <br /> 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 surnmanzed 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 Field data sheets from the <br /> June 2004 quarterly groundwater sampling event are included as Attachment A <br /> Laboratory reports for the groundwater samples collected for these sampling <br /> • events are included as Attachment B <br />' Tbrs export nasi pirpared rn accordance iamb the standards of the entrronmental consulting industry at the time it uas prrparrd li should not be <br /> robed upon by parties other than thosefor whom it sins prepared,and thin only to the extent of the scope of"rk vhieh nus autharigd This <br /> report does not guarantee that no additional environmental contaminairon beyond that described rn ibis rrport exists at tlse site <br /> P\21000\21417 T&T\Reports\2nd-04gtr doc <br />