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monitoring wells. They are 7675 West Eleven St. (the property <br /> immediately to the east of the subject site) , 8203 West Eleventh <br /> ,F St. and 7890 West Eleventh St. The plans, with the monitoring <br /> well locations are in Appendix C. They are 2 inch PVC drilled <br /> into the first saturated zone and are less than 40 feet deep. <br /> The gradients are reported to be northerly for all three sites <br /> which coincides with the calculated gradient for the subject <br /> property. <br /> ADDITIONAL WELL WORK <br /> All the site wells have had new well manhole covers placed on <br /> them at grade level subsequent to the March measurements. The <br /> existing well casings were cut to below grade and new elevations <br /> for top of the casings were established. <br /> SUMMARY, CONCLUSIONS AND-RECOMMENDATIONS <br /> The calculated groundwater gradient is N260W or 3340 . The water <br /> levels in the monitoring wells has risen approximately on foot <br /> since the last water levels were taken. This rise is most likely <br /> due to the heavy rains experienced in this local for the last <br /> three months. <br /> The well survey data and reported gradient data indicate that the <br /> general gradient in the immediate vicinity of the subject site is <br /> northerly and does not impact any domestic wells. <br /> The "potable well" water sample had no detectable concentrations <br /> of TPHG, BTEX or the Oxygenates. <br /> MW-1 had no detectable concentrations of TPHG, BTEX or the <br /> Oxygenates. <br /> MW--2 had less than 1 ppm TPHG, 26 ppb Benzene and 4.1 ppb MTBE <br /> contamination. ' <br /> MW-3 had no detectable concentrations of TPHG, 13 ppb Benzene and <br /> less than 1 ppb MTBE contamination. <br /> MW-BT had no detectable concentrations of - TPHG or Oxygenates, 7.1 <br /> ppb Benzene, 1.7 ppb Xylene and less than 1 ppb Ethylbenzene <br /> contamination. <br /> The concentrations of contaminants are very low. Therefore JPCA <br /> recommends that two more quarters of groundwater sampling and <br /> gradient determinations. After the four quarters of data have <br /> been compiled and analyzed, closure of the site file may be <br /> 6 <br />