Laserfiche WebLink
... ..r <br /> Site Background Information: West Clay Properties <br /> Page 10 of 10 <br /> water samples collected prior to the excavation of the former northern cluster UST area. <br /> However after removal of soil,well MW-10 has generally been non-detect for chemicals of <br /> concern and concentrations have been declining significantly in well EW-1. <br /> • The wells installed to define the vertical extent of dissolved hydrocarbon contamination <br /> demonstrated limited impact to the eastern edge of the former UST area at wells MW-11 B <br /> and MW-1413, at depths of 45 feet and 65 feet bsg, respectively. Based upon "deep" grab <br /> ground water samples at boring CPT-4, the vertical extent is not greater than 80 feet bsg <br /> across the former UST area. <br /> • MTBE was also released with the TPH-g and migrated vertically to the east and, to a lesser <br /> extent, north and northeast, as evidenced by detection of contaminants in wells MW-9, <br /> MW-11B and MW-1413. Low concentrations of 1,2-DCA have been detected at the site; <br /> however, concentrations appear to be stable throughout the monitoring well network. The <br /> current maximum concentrations of 1,2-DCA is 44 µg/l at MW-11B. <br /> • The lateral and vertical extent of TPH and BTEX has been defined by sample set. <br /> GROUND WATER REMEDIATION PILOT TEST - OZONE ITU 1 <br /> • Ozone injection remediation has been intermittently operational for two years. The ozone <br /> unit has been repaired and maintained; when the system operated continuously. Currently <br /> the ozone injection system is not operational. <br /> Advanced GeoEnvironmental,Inc. <br />