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DESCRIPTION OF LATEST WORK PERFORMED <br /> Since February, water elevations in monitoring wells 1-4 were measured <br /> twice a month. This data is presented in tabular form in Appendix <br /> A, page A-1. For each day that a set of elevations was obtained, <br /> the data was plotted on a map and the groundwater flow direction <br /> was determined. This data indicates that the groundwater generally <br /> flows northeast to northwest. However, a consistent flow direction <br /> and gradient has not yet been identified. This may be due to local <br /> pumping effects, seasonal effects, or other reasons. In order to <br /> obtain more extensive data on the groundwater direction and gradient, <br /> and to help identify the extent of the salt contamination plume, <br /> five monitoring wells were installed on May 10 and 11, 1988. The <br /> locations of these wells are shown in the map on page 3. <br /> Monitoring Well Construction <br /> All five wells were installed with the use of an eight inch, <br /> hollow-stem, continuous-flight auger. The wells are constructed <br /> of 2" schedule 40 PVC with threaded joints. They are screened from <br /> 10' to 30' with factory perforated 0.020" slots. The annular space <br /> extending from the bottom of the well to three feet above the screen <br /> is packed with a #3 Lonestar sand. The next two feet above the sand <br /> is filled with a bentonite plug and the remaining five feet is grouted <br /> with a bentonite/cement slurry. <br /> Well Logging and Development <br /> Experienced personnel performed the well logging under the supervision <br /> of a registered civil engineer. Copies of the well logs are located <br /> in Appendix B, page B-1. Well development was accomplished by Spectrum <br /> Drilling using a surge block and bailer. Specific details of this <br /> procedure are provided in the letter from Spectrum Drilling located <br /> in Appendix C, page C-1. <br /> 2 <br />