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I QUARTERLY MONITORING REPORT April 1998 <br /> . CANEPA S CAR <br /> 6230 Pacific Avenue Stocktonon,,CA CA <br /> M-iy 26, 1998 <br /> Page -3 <br /> approximately 3 2 feet since January 1998 The groundwater elevation ranged from 22 41 to 23 51 feet <br /> below sea level (bmsl) The groundwater elevation contour map (Figure 3, Appendix A) Indicates <br /> groundwater mounding in the center of the site in the vicinity of MW-1 See Table 1, on the following <br /> page, for groundwater elevation data A hydrograph of groundwater elevations is included as Figure 4, <br /> Appendix A <br />' TABLE 1 <br /> Groundwater Elevation Data (April 22,1998) <br /> MW-1 through MW-8 <br /> Well Well Casing Well Collar Depth to Groundwater <br /> ID Screen Elevation Water Elevation <br /> Interval (feet) (feet) (feet) <br /> (feet- bgs) <br /> MW-1 50- 70 1345 35 86 -2241 <br /> MW-2 50-70 1327 36 13 -2286 <br /> MW-3 50- 70 13 50 3630 -2280 <br /> MW-4 50-70 13 82 3627 -2245 <br /> MW-5 50-70 1269 3526 -2257 <br /> MW-6 45 -65 11 62 35 13 -23 51 <br /> MW-7 45 -65 13 18 3603 -2285 <br /> MW-8 45 -65 1326 3594 -2268 <br /> I � <br /> 4 2 LABORATORY ANALYSES (TPH-G,13TEX, OXYGENATES/ADDITIVES) <br /> The groundwater samples were analyzed by GeoAnalytical laboratories, Inc for total petroleum <br /> hydrocarbons - quantified as gasoline (TPH-G) by Method 5030/IUFT, for benzene, toluene, ethyl <br /> benzene, and total xylenes (BTEX) by EPA Method 602, and for gasoline oxygenates/additives by EPA <br /> Method 8260 The gasoline oxygenates/additives include methyl tertiary-butyl ether (MTBE), ethanol, <br /> tert:arx-b::t.".n-o! di-.so -tiler ��iAEI etl, 1 +-. t- " r +1--- /r_'rnn� a i i t <br />. ,J , NJ' v �, v xayi LrILIaiy-UuLy1 Cul%.i LA_.IUL.f, allU telLlaly-alilyl 111etllyl <br /> ether(TAME) <br /> IChemical analyses indicated that gasoline oxygenates/additives, excluding MTBE, were not detected, at <br /> or above the Iaboratory reported detection limits in any of the samples analyzed Chemical analyses also <br /> indicated that the groundwater samples collected from monitor wells MW-5, MW-6, MW-7, and MW-8 <br /> did not contain B rEX, gasoline oxygenates/additives, or TPH-G at or above the laboratory reported <br /> • detection limits TPH-G was detected in groundwater samples collected from MW-1, MW-2, and SV-2 <br /> at concentrations ranging from 14 to 270 mg/l One or more BTEX constituents were detected in MW-1, <br /> MW-2, MW-4, and SV-2 at concentrations ranging from 1 67 (MW-4) to 66,000 gg/l (SV-2) MTB <br /> n <br /> �� CONDOR <br />