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a , <br /> f 1 <br /> 44 <br /> 2.0 SCOPE OF WORK , <br /> b <br /> i <br /> Work performed by PACIFIC for the most recent phase of this investigation included <br /> r the installation of three additional groundwater monitoring wells and three exploratory <br /> soil borings as outlined in the recommendations section of. PACffIC's Soil and <br /> Groundwater Investigation Report dated February 13, 1991. <br /> On May 9, 1991, PACIFIC installed Groundwater Mo litoring Wells U4 through U-6 <br /> ouch U-C at the locations shown on Figure 2. <br /> and Exploratory Sail Borings U-A thr <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 /> l r depth of 17-1/2 feet. The borings for Wells U-4 and U-6 were drilled to a depth of }} <br /> 21-1/2 feet, and the boring for U-6 was drilled to a depth of 20 feet. Wells U•4, U-S, 1 <br /> and U-6,were constructed of 3-inch diameter Schedule 40 PVC casing, with perforated ~x <br /> �> intervals from S to.13 feet below grade for.0-4, and S to 20 feet below grade for Wells <br /> U-6 and U-6. Soil samples were collected at a maximum 7-1/2-foot interval during j <br /> drilling,.and selected samples were submitted for analysis by a State-certified analytical 1 �' <br /> laboratory. The wells were installed as described in the investigative procedures section `-a <br /> • of this report (Appendix A). The newly constructed wells were developed, and all site <br /> A. 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 t •, <br /> location and elevation by a State-registered surveyor. At this time, Wells U-1 throu,h ' <br /> 5 M1`i <br /> U-3 were resurveyed to ensure a common datum. <br /> 3100101;REPORT'_ 3 September 30. 1901 c <br />