Laserfiche WebLink
! QUARI LRLY MONITORING REPORT,July 1998 <br /> GANEPA CAR WASH <br /> 6230 Pacific Avenue,,Stock-ton CA <br /> August 24 1998 <br />! Page -3 <br /> measuring points (slightly below the ground surface) The average depth to groundwater has decreased <br /> appro)+imately 0 5 feet since April, 1998 1 he groundwater elevation ranged from 2196 to 22 96 feet <br />! below sea mean 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-i See Table 1, on the following <br /> page, for gioundwater elevation data A hydrograph of groundwater elevations is included as Figure 4, <br />! Appendix A <br />! TABLE I <br /> Groundwater Elevation Data(July 21, 1998) <br /> MW-1 through MW-8 <br />! Well Well Casing Well Collar Depth to <br /> Groundwater <br />! ID Screen Elevation Water Elevation <br /> Interval (feet) (feet) (feet) <br /> (feet- bgs) <br /> MW-1 50-70 13 45 3544 -2I 99 <br /> MW-2 50-70 13 27 3523 -21 96 <br /> MW-3 50- 70 13 50 35 81 -2231 <br /> MW-4 50-70 13 82 35 86 -2204 <br /> IMW-5 50- 70 1269 3484 -22 15 <br /> MW-6 45 -65 1 162 3458 -2296 <br />' MW-7 45 -65 13 18 35 71 -2253 <br /> MW-8 45 -65 13 26 3590 -2264 <br /> I4.2 LABORATORY ANALYSES (TPH-G,BTEX,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/LUFT, for benzene, toluene, ethyl <br />_ benzene, and total xvlenes (BTEX) by EPA Method 602, and for vasoline oxv#;enates/additives by EPA <br /> Method 8260 The gasoline oxygenates/additives Include methyl tertiary-butyl ether (MTBE), ethanol, <br /> I tertiary-butanol, di-isopropyl ether (DIPE), ethyl tertiary-butyl ether (ETBE), and tertiary-amyl methyl <br /> ether(TAME) <br /> Laboratory analyses indicated that gasoline oxygenates/additives,excluding MTBE, were not detected, at <br /> or above the laboratory 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-7, and MW-8 did not <br /> contain B 1'EX, gasoline oxygenates/additives, or TPH-G at or above the laboratory reported detection <br /> limits TPH-G was detected in groundwater samples collected from MW-1, MW-4, and SV-4 at <br /> concentrations of 32, 0 1, and 390 mg/l, respectively One or more BTEX constituents were dete n <br /> Ito CONDOR <br />