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Ripona Market <br /> Quarterly Groundwater Sampling Report October 2002 <br /> Page: 2 <br /> monitoring event A hydrograph of the groundwater elevations at the Ripona Market site <br /> is presented in Figure 6 <br /> Groundwater flow direction October 17, 2002 was North 75 East with a gradient of 0 008 <br /> ft/ft The groundwater elevations and groundwater flow direction are shown on Figure 2 <br /> Site Map / Groundwater Flow This is a minor shift in groundwater flow and gradient <br /> from North 86 East / 0 008 ftlft observed in July 2002 and similar the July 2000 flow of <br /> North 80 East/ 0 009 <br /> Groundwater Elevations 10-17-02 <br /> Well Collar Elevation DTW GW Elevation <br /> MW-1 6958 2528 443 <br /> MW-2 7001 2564 4437 <br /> MW-3 70 2587 14413 <br /> The analytical laboratory reported groundwater contamination by gasoline and aromatic <br /> compounds in wells MW-2 and MW-3 MTBE was detected in well MW-2 located at the <br /> edge of the tank basin Groundwater chemistry for the October 2002 event is presented in <br /> Figure 3 MTBE was reported at a concentration of 615 ug/l in well MW2, a decrease of <br /> 22,000 ug/l over the July 2002 monitoring event MTBE distribution for the October <br /> . 2002 event is shown in Figure 4 Benzene was reported at concentrations of 5 7 ug/l in <br /> well MW2 and 3 2 ug/l in well MW-3 Benzene distribution for the October 2002 event is <br /> shown in Figure 5 Methanol was not detected in any of the wells and does not appear to <br /> be present at the site <br /> Laboratory Groundwater Sample Results Petroleum Com ounds 10-17-2002 <br /> Sample I D I Gasolme Benzene Toluene E-Benzene Xylenes MTBE t-Butanol TAME <br /> MW-1 <05 <03 <03 <03 <06 <10 <20 <10 <br /> MW-2 Oil 57 18 18 14 615 29 <1 0 <br /> MW-3 006 32 5 8 09 64 <10 <20 <1 0 <br /> ND=Non Detect NA=Not Analyzed <br /> Mg/L for gasoline&Methanol µg/C for BTEX,MTBE,and 8260 Oxygenated Compounds <br /> The release appears to be centered on well MW2 with slight down gradient migration <br /> toward well MW3 The low concentrations in well MW3 indicate that the plume is <br /> localized in the vicinity of the release <br /> Fuel oxygenates were previously detected in soil samples collected at depths of 25 and 30 <br /> feet in a boring in the vicinity of the former underground storage tanks The extent of the <br /> groundwater plume, as detected in the current monitoring event, is undefined A survey <br /> of potential contamination plume receptors within 2,000 feet of the point of release <br /> identified water well approximately 2000 feet from the former underground storage tanks <br />