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_ <br /> February 15, 1983 <br /> Project 116-1.4 <br /> - 4 - <br /> - Excavate a shallow sump on the up-gradient side of the lateral <br /> berm. Complete the trench drains to the shallow, temporary sump. <br /> (The trench floor is already sloped. to drain toward the sump. ) <br /> Since all floor and side-wall liners have been placed and compacted <br /> to specifications, FMC waste could temporarily be placed from the <br /> south end of the trench. When weather conditions permit, the <br /> lateral berm could be removed and the floor drains completed to the <br /> permanent sump. <br /> Rainwater which contacts waste material would collect in the shallow <br /> sump where it could be contained until it was analyzed and subse- <br /> quently removed. Details of the interim trench plan are shown <br /> on Plate 2. <br /> Alternative #2 <br /> - Enlarge the embankment enclosure on top of Group 1 Trench #2 alid <br /> place incoming waste within the embankment. <br /> - Leachate formed by precipitation inside the embankment could be <br /> analyzed and reported in accordance with operations requirements <br /> and then transferred to the evaporation pond system. <br /> FMC sludge will be covered by 6 mil. black PVC sheeting to prevent <br /> removal of waste by wind. <br /> In order to implement either of the above alternatives, some drying of site <br /> soils will be necessary to permit equipment access. If the south end of <br /> Trench #4 is used, some rainwater must be removed by pumping. <br /> Solar Evaporation Ponds <br /> Representatives of your staff have been informed of the subsurface investi- <br /> gation and liner inspection conducted in Ponds #1, #2 and #3 by BETA ASSOCIATES <br /> and Baier Agronomy. We are continuing to work with members of your staff <br /> to resolve differences regarding interpretation of chemical analyses of <br /> soil samples. Until this work can be completed, we wish to present the <br /> following information pertaining to repair work and use of the Pond system. <br /> Pond #1, #2 and #3 were thoroughly cleaned of all solid residue to permit <br /> the required liner inspection. Portions of all three pond liners were <br /> removed and the excavated soil was used as cover material in the Group 2 <br /> disposal area. All three liners were then placed to a thickness of 3' and <br /> compacted to specification. During drilling and sampling of the pond area, <br /> '-Betav4ssociates - �3 <br />