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C <br /> E <br /> are presented in Table 1. The gradient calculated for the <br /> monitoring wells is N220Wor 338° . The groundwater gradient is <br /> depicted in Figure 3. Survey and well data are in Appendix B. <br /> =i TABLE 1 <br /> 's <br /> Groundwater Elevations (ft) - November 10, 1997 <br /> Wel _1D Top of Casing Depth to Water Groundwater-Elevation <br /> MW-1 50.81 10.22 40.59 <br /> is <br /> MW-2 50.42 9.98 40.44 <br /> MW-3 49.19 8.75 40.44 <br /> MW-BT1 49.65 9.10 40.55 <br /> ANALYTICAL RESULTS <br /> The analytical methods are those required in the "Tri-Regional <br /> Guidelines" which are directives of the Regional Water Quality <br /> `i <br /> Control Board and required by the SJCEHD. <br /> The analyses completed were for Total Petroleum Hydrocarbons, as <br /> gasoline (TPHG) ,* Benzene, Toluene, Ethylbenzene and Xylene (BTEX) <br /> via EPA Modified Method 8020/8015 and for the Oxygenates using <br /> the EPA method 8260. <br /> The results of the <br /> groundwater samples in ug/L, ie parts per <br /> billion (ppb) for TPHG and BTEX are shown in Table 2. <br /> TABLE 2 <br /> ppb <br /> `- WELL ID TPHG B T E X <br /> MW-BT 100 7.5 2.0 1.0 7.4 <br /> MW--1 360 1. 3 1.4 0.57 17 <br /> MW-2 350 15 5.5 2. 3 5.7 <br /> MW-3 690 19 22 17 75 <br /> The results of the groundwater samples in ug/L, ie parts per <br /> billion (ppb) for the oxygenates are shown in Table 3. <br /> r' 5 <br /> -i <br />