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MW-9, MW-10, MW-11, MW-12, MW-17, and MW-18 contained either <br /> non-detectable hydrocarbon concentrations or concentrations below DHS <br /> MCLs for drinking water <br /> The only halogenated volatile organic compound (HVOC) concentrations <br /> detected at the site were relatively low concentrations of PCE in the <br /> groundwater sample collected from monitoring well MW-1, and relatively <br /> low concentrations of 1,2-DCP in groundwater samples collected from <br /> several wells screened in water-bearing zones below 19-feet bgs None of <br /> these HVOC concentrations exceeded DHS MCLs for drinking water <br /> 2. 17 November 2000 Monitoring Well Resampling <br /> In November 2000, ASE resampled the monitoring wells on the north <br /> shoulder of West Yosemite Avenue to confirm the presence of MTBE in t h e <br /> intermediate zone and to provide additional baseline data for the <br /> evaluation of the interim remediation system Groundwater samples <br /> collected from monitoring well MW-16, screened in the intermediate <br /> water-bearing zone 49 to 64-feet bgs, contained 29 ppb MTBE These <br /> results are slightly lower than results in the September sampling The <br /> highest hydrocarbon concentrations were once again detected in <br /> groundwater samples collected from monitoring well MW-13, which <br /> contained 14,000 ppb TPH-G, 1,500 ppb benzene, 77 ppb toluene, 1 ,300 <br /> ppb ethyl benzene, 390 ppb total xylenes, 2,400 ppb MTBE, 9 5 ppb TAME, <br /> and 770 ppb TBA <br /> 2- 1 9 December 200-0 Groundwater Saml2ling <br /> In December 2000, ASE conducted the quarterly groundwater sampling <br /> for the site Free-floating hydrocarbons were still present on the <br /> groundwater surface in monitoring well MW-5 Hydrocarbon <br /> concentrations detected in groundwater samples collected from <br /> monitoring wells MW-4, MW-14, MW-16 and MW-19 decreased <br /> significantly from the previous sampling The hydrocarbon <br /> concentrations detected in groundwater samples collected from <br /> monitoring well MW-6 show a decreasing trend but still remained <br /> elevated The benzene, ethyl benzene, and MTBE concentrations detected <br /> in groundwater samples collected from monitoring well MW-13 increased <br /> from the previous sampling Overall there was a decrease in MTBE <br /> concentrations throughout the site with the exception of monitoring well <br /> MW-13 <br /> Frank's One Stop Remedial Action Plan — August 2001 <br /> -8- <br />