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MTBE No TPH-G, TPH-D, BTEX or alcohols were detected in t h e <br /> groundwater sample collected from monitoring well MW-20 <br /> Groundwater samples collected from monitoring well MW-16, located <br /> near monitoring well MW-13 but screened in a deeper water-bearing zone, <br /> contained 26 ppb MTBE, 8 8 ppb TBA, 11 ppb ethanol and 58 p p b <br /> methanol Although this MTBE concentration still exceeds the DHS MCL <br /> for drinking water, this concentration still represents a significant <br /> decrease in MTBE concentration with depth <br /> Groundwater samples collected from monitoring well MW-6, just south o f <br /> the gasoline USTs, contained 1,100 ppb toluene, 1,200 ppb ethyl benzene <br /> and 7,200 ppb total xylenes All of these concentrations exceeded DHS <br /> MCLS for drinking water No benzene or MTBE were detected in t h e <br /> groundwater samples collected from monitoring well MW-6 <br /> Only trace concentrations of MTBE, below the DHS MCL for drinking water <br /> of 5 ppb, were detected in groundwater samples collected from <br /> monitoring wells MW-3, MW-4, MW-8, and MW-9 <br /> No TPH-G, TPH-D, BTEX, or oxygenates were detected in groundwater <br /> • samples collected from monitoring wells MW-1, MW-2, MW-7, MW-10, <br /> MW-11, MW-12, MW-17, and MW-18 <br /> PCE was detected in groundwater samples collected from monitoring well <br /> MW-1 at 2 9 ppb, which is below the DHS MCL for drinking water of 5 <br /> ppb <br /> Groundwater samples collected from monitoring wells MW-7, MW-8, <br /> MW-11, MW-12, MW-17, MW-18 and the on-site drinking water well <br /> contained 1,2-dichloropropane at concentrations up to 2 7 ppb, which is <br /> below the DHS MCL for drinking water of 5 ppb All of these wells are <br /> screened in deeper water bearing zones No 1,2-DCP has been detected in <br /> the shallow water-bearing zone above 20-feet bgs <br /> Other than the MTBE concentration detected in groundwater samples <br /> collected from monitoring well MW-16, none of the compounds detected <br /> in groundwater samples from any of the deeper water-bearing zones <br /> exceeded DHS MCLs for drinking water Compounds detected in <br /> groundwater samples collected from these deeper water-bearing zones <br /> included MTBE, TBA, ethanol, methanol and 1,2-DCP Concentration o f <br /> these compounds either did not exceed DHS MCLs for drinking water, or <br /> no DHS MCL has been established for these compounds <br /> Franks One Stop Report - November 2000 <br /> -15- <br />