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U-1. <br /> .r. <br /> 2.0 SCOPE OF WORK <br /> Work performed by PACIFIC for the most recent phase of this investigation included <br /> the installation of three additional groundwater monitoring wells and three exploratory <br /> soil borings as outlined in the recornmendations section of PACIFIC's Soil and <br /> T Groundwater Investigation Report dated February 13, 1991. <br /> On May 9, 1991, PACIFIC installed Groundwater Monitoring Wells U-4 through U-6 <br /> and Exploratory Soil Borings U A through U-C at the locations shown on Figure 2. <br /> Borings U-A and U-B were drilled to a depth of 16-1/2 feet and U-C was advanced to a <br /> depth of 17-1/2 feet. The borings for Wells U-4 and U-6 were chilled to a depth of <br /> 21-1/2 feet, and the boring for C-5 was drilled to a depth of 20 feet. Wells U-4, TJ-5, <br /> and U-6 were constructed of 3-inch diameter Schedule 40 PVC casing, with perforated i <br /> intervals from S to 18 feet below grade for U-4, and S to 20 feet below grade for Wells <br /> U-5 and U-6. Soil samples were collected at a rr;iximurrl 7-1/2-foot interval during <br /> drilling, and selected samples were submitted for analysis by a State-certified analytical <br /> laboratory. The wells were installed as described in the investigative procedures section <br /> of this report (Appendix A). The newly constructed wells were developed, and all site <br /> wells were sampled on May 23, 1991, in accordance with the procedures outlined in <br /> Appendix A. At this time, depth to water measurements were recorded for hydrologic <br /> - calculations. Subsequent to their installation,Wells U-4 through U-6 were surveyed for <br /> location and elevation by a State-registered surveyor. At this time, Wells U-1 through <br /> U-3 were resurveyed to ensure a common datum. <br /> i <br /> I ~ <br /> F <br /> i <br /> r . <br /> i <br /> 3100101j'REPORT2 3 Sepiember30, 1991 <br />