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• TBA was detected in ground water from boring B-6 at 86 µg/1 No <br /> 16other fuel oxygenate compounds were detected in this sample No <br /> fuel oxygenate compounds were detected in ground water from boring <br /> B-5 <br /> 25 ADDITIONAL SOIL AND GROUND WATER CHARA CTERIZA TION <br /> In April 1999, in response to the PHS/EHD request, ERM, on behalf of <br /> UPRR, advanced soil boring B-7 and installed ground water monitoring <br /> wells MW-1 through MW-3, as follows <br /> • MW-1 upgradient (southwest) of the former tank location, <br /> • MW-2 adjacent (southeast) of the former tank location, <br /> t • MW-3 downgradient (northeast) of the former tank location, and <br /> B-7 adjacent (northwest) of the former tank location <br /> Each monitoring well was constructed to a depth of 50 feet bgs The <br /> monitoring wells were screened from 50 to 35 feet bgs with a 15-foot <br /> I section of 2-inch-diameter, Schedule 40 polyvinyl chloride (PVC) screen <br /> with 10-slot (0 010-inch) openings <br /> All boring locations are shown on Figure 2 The results of these additional <br /> characterization activities were presented in a report entitled, Soil and <br /> Ground Water Investigation Report - Union Pacific Railroad Company 936 East <br /> Weber Avenue- Stockton, California (ERM, June 1999) <br /> A total of rune soil and four ground water samples (from locations B-7, <br /> MW-1, MW-2, and MW-3) were collected and analyzed for TPH-g, BTEX, <br /> and fuel oxygenates These analytes were not detected in any of the <br /> samples submitted for analysis In addition, no elevated photoionization <br /> detector (PID) readings were recorded during field screening of samples <br /> from this investigation The soil and ground water analytical data <br />' generated from these samples are summarized in Tables 1 and 2, <br /> respectively <br /> The data collected during this investigation verified the accuracy of the <br /> 1998 soil and ground water sampling results that indicated that soils did <br /> not exceed the TPH cleanup goals Furthermore, the data indicated that <br /> significant volumes of TPH-impacted soils are not present beneath the <br /> site <br /> r <br /> ERM 7 9343 50/UM/07/11/02 <br />