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Historical Background: River City Petroleum and Connell Motor Lift Truck <br /> Page 13 of 13 <br /> • Laterally, 1,2-DCA extends into almost every well on-site, at low concentrations west and <br /> ' south. Significant concentrations are detected in the wells established directly west of the <br /> former UST area, lower concentrations in the magnitude of the 10's are present in the wells <br /> established in the western end of the building and further west of the building.The 1,2-DCA <br /> ' is defined at 200 feet west, at 150 feet north and 120 feet south by CPT samples,monitoring <br /> well data and at 100 feet east of the site,mostly through monitoring well sampling and soil <br /> boring samples. 1,2-DCA was detected in samples at concentrations ranging from 4.2 µg/1 <br /> ' to 1,600 µg/l, which are above the MCL of 0.5 µg/l for drinking water. The investigations <br /> to date suggest that the source of the 1,2-DCA is the former UST site. <br /> ' The vertical extent, and the lateral extent between intermediate- and deep-screen ground <br /> water depths, of 1,2-DCA have not been defined(Figure 4). <br /> r <br /> Advanced GeoEnvironmental,Inc. <br />