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Appendix A- Historical Background <br /> River City Petroleum and Connell Motor Lift Truck <br /> Page 13 of 13 <br /> the depth of 150 feet bsg in the former UST area. Laterally, 1,2-DCA extends into almost <br /> every well on-site, at low concentrations west and south. Significant concentrations are <br /> detected in the wells established directly west of the former UST area,lower concentrations <br /> in the magnitude of the 10's are present in the wells established in the western end of the <br /> building and further west of the building. The 1,2-DCA is defined at 200 feet west, at 150 <br /> feet north and 120 feet south by CPT samples, monitoring well data and at 100 feet east of <br /> the site, mostly through monitoring well sampling and soil boring samples. 1,2-DCA was <br /> detected in samples at concentrations ranging from 4.2 µg/l to 1,600 µg/1,which are above <br /> the MCL of 0.5 gg/l for drinking water. The investigations to date suggest that the source of <br /> 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(see Figure 5). <br /> Advanced GeoEnviron mental,Inc. <br />