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10 . 0 ANALYTICAL RESULTS FOR GROUNDWATER <br /> The groundwater samples were analyzed by Kiff Analytical, LLC for TPH-G, <br /> BTEX, the fuel oxygenates MTBE, TBA, TAME, DIPE and ETBE, lead <br /> scavengers 1,2-DCA and 1,2-EDB, and the alcohols ethanol and methanol <br /> by EPA Method 8260 The analytical results are tabulated in Table Two <br /> Copies of the certified analytical report and chain of custody form are <br /> included in Appendix G <br /> Groundwater samples collected from monitoring well MW-1 contained 6 5 <br /> ppb MTBE The groundwater samples collected from monitoring well <br /> MW-2 contained 10,000 ppb TPH-G, 310 ppb benzene, 440 ppb toluene, <br /> 170 ppb ethyl benzene, 1,100 ppb total xylenes, 1,400 ppb MTBE, 4 8 p p b <br /> Cert-amyl methyl ether (TAME), and 82 ppb tert butanol (TBA) The <br /> groundwater samples collected from monitoring well MW-4 contained 260 <br /> ppb TPH-G, 17 ppb benzene, 50 ppb ethyl benzene, 75 ppb total xylenes, <br /> 140 ppb MTBE, and 60 ppb TAME The groundwater samples collected <br /> from monitoring well MW-5 contained 2,600 ppb TPH-G, 11 ppb ethyl <br /> benzene, 1 6 ppb ethyl benzene, 84 ppb MTBE, and 52 ppb TBA There <br /> were no compounds detected above laboratory reporting limits in <br /> monitoring well MW-3 <br /> The benzene concentrations in groundwater samples collected from <br /> monitoring wells MW-2 and MW-4, and also the toluene concentration in <br /> groundwater samples collected from monitoring well MW-2, exceeded t h e <br /> DHS MCL for drinking water The MTBE concentrations in groundwater <br /> samples collected from monitoring wells MW-1, MW-2, MW-4, and MW-5 <br /> exceeded the DHS MCL for drinking water <br /> Iso concentration maps for TPH-G, benzene, and MTBE are presented as <br /> Figures 7 through 9, respectively <br /> 11 . 0 GROUNDWATER ELEVATIONS AND FLOW <br /> The ground surface elevation and top of casing elevation of each n e w <br /> groundwater monitoring well was surveyed relative to mean sea level <br /> (msl) by Farley Surveying, Inc of Stockton, California on October 16, <br /> 2000 The northing and easting locations of the wells were surveyed <br /> relative to the California Coordinate System The benchmark used for this <br /> survey was the City of Tracy GPS #21 located in the monument box at the <br /> centerline of Grant Line Road, near the east crosswalk of Tracy Boulevard <br /> The survey information is presented in Appendix H <br /> 574 West Grant Line Road Report — October 2000 <br /> -9- <br />