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�� Purge Water Disposal <br /> Well development and sampling purge water were contained in 55-gallon <br /> steel drums and were left on-site for temporary storage The water that <br /> did not contain a significant amount of sediment was treated by the on- <br /> site groundwater remediation system The remaining water will be <br /> transported to an appropriate facility for recycling <br /> 8 . 0 ANALYTICAL RESULTS FOR GROUNDWATER <br /> The groundwater samples were analyzed by K1ff Analytical for TPH-D by <br /> modified EPA Method 3550/8015 and TPH-G, BTEX, fuel oxygenates, <br /> alcohols and HVOCs by EPA Method 8260 The analytical results are <br /> tabulated in Tables Two and Three Copies of the certified analytical <br /> report and chain of custody form are included in Appendix G <br /> Isoconcentration maps for TPH-G, benzene and MTBE in the shallow water- <br /> bearing zone are presented as Figures 7 through 9, respectively <br /> Groundwater samples collected from off-site, downgradient monitoring <br /> wells MW-13, MW-14, MW-15, MW-19 and MW-20 contained MTBE <br /> concentrations exceeding the DHS MCL for drinking water The highest <br /> concentration was in the groundwater sample collected from monitoring <br /> well MW-13, on the northern shoulder of West Yosemite Avenue, which <br /> contained 2,000 ppb MTBE Groundwater samples collected from <br /> monitoring well MW-13 also contained 1,000 ppb benzene, 8 0 p p b <br /> toluene, 1,100 ppb ethyl benzene, 1,300 ppb total xylenes, 8 6 ppb TAME, <br /> and 600 ppb TBA <br /> Groundwater samples collected from monitoring well MW-15, the off-site <br /> monitoring well along the northern shoulder of West Yosemite Avenue <br /> farthest to the east, contained 22 ppb MTBE, 56 ppb TBA and 58 p p b <br /> methanol No TPH-G, TPH-D or BTEX were detected to the groundwater <br /> samples collected from monitoring well MW-15 <br /> Groundwater samples collected from monitoring well MW-19, the off-site <br /> monitoring well on the northern shoulder of West Yosemite Avenue <br /> farthest to the west, contained 1,500 ppb TPH-G, 12 ppb benzene, 0 51 <br /> ppb toluene, 72 ppb ethyl benzene, 540 ppb MTBE, 2 2 ppb TAME, and 6 1 <br /> ppb TBA <br /> Groundwater samples collected from monitoring well MW-20, the <br /> . downgradient monitoring well farthest to the north, contained 92 p p b <br /> Franks One Stop Report — November 2000 <br /> - 14- <br />