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a <br /> 2.0 SCOPE OF WORK <br /> L :; i <br /> Work performed by PACIFIC for the most recent phase of this investigation included <br /> the installation of four additional groundwater monitoring wells, two on-site and two <br /> off-site (Figure 2). <br /> On'March 10 through 12, 1991, PACIFIC installed groundwater Monitoring Wells U-7 <br /> through U-10. Wells U-7 through U-9 were drilled to a depth of 16-1/2 feet and Well <br /> U-10 was advanced to a depth of 16 feet. The boring of Well U-10 was drilled using a <br /> limited access drill rig with a six-inch hollow stem auger. The wells were constructed of <br /> 3-inch diameter Schedule 40 PVC casing,with perforated intervals from 4-1/2 to 15 feet <br /> ibelow,grade for Wells U-7, U-9 and U-10, and 4-1/2 to 14-1/2 feet below grade for <br /> Well U-8. <br /> §oil samples were collected every five feet during drilling, and selected samples were <br /> submitted for analysis by a state-certified analytical laboratory. !The wells were <br /> 'installed as described in the investigative procedures section] of this. report <br /> '(Appendix A). <br /> Subsequent to their installation, Wells U-7 through U-10 were suneved for location <br /> and elevation relative to MSL by a state-registered surveyor. At this time, Wells U-1 <br /> through U-6 were resurveyed to ensure a common datum. The newly constructed wells <br /> were developed, and all wells were sampled on March 31 and ,April 1, 1992, in <br /> accordance with the procedures outlined in Appendix A. Depth to water measurements <br /> were also recorded for hydrologic calculations. <br /> S <br /> it <br /> 3100103%REPORT3 4 June 11, 1992 <br />