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,�P� <br /> 1; <br /> PIS <br /> 1 <br /> 1 <br /> 2.0 SCOPE OF VfORK <br /> r± Work performed by PACIFIC for the most recent phase of this investigation included <br /> f <br /> a the installation of three additional groundwater monitoring wells and three exploratory i <br /> soil borings as outlined in the recommendations section of PACIFIC's Soil and <br /> 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 U4 and U-6 were drilled to a depth of <br /> 1 21-1/2 feet, and the boring for U-5 was drilled to a depth of 20 feet. Wells U-4, U-5, ! <br /> and U-6 were constructed of 3-inch diameter Schedule 40 PVC casing, with perforated <br /> intervals from 5 to 13 feet belaw grade for U-4, and 5 to 20 feet below grade for Wells <br /> U-5 and U-6. Soil samples were collected at a maximum 7-1%2-:oot interval during <br /> drilling, and selected samples were submitted for analysis by a State-certified analytical a <br /> laboratory. The wells were installed as described in the investigative procedures section r <br /> F of this report (Appendix A). The newly constructed wells were developed, and all site <br /> ? wells were sampled on flay 23; 1991, in accordance with the procedures outlined in . <br /> 1 Appendix A. At this time, depth to water measurements were recorded for hydrologic 1 <br /> calculations. Subsequent to their installation, Wells U4 through U-6 were surveved for <br /> .f location and elevation by a State-registered surveyor. At this time, Wells U-1 through <br /> U-3 were resurveved to ensure a common datum. y ; <br /> -� i <br /> i <br /> r. <br /> 4� <br /> 310010]!REPOR'i' 3 Sc�icmber 30, i991 <br /> u <br />