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r <br />Inc <br />Ms. Lori Potter <br />November 18, 1999 <br />Page 2 <br />A working platform width of 50 feet may be rather tight in deeper sections of the slurry trench if <br />backfill is to be mixed along the side of the trench. Fora 60-foot deep trench, a total platform <br />width of SS feet would provide a more practical width. <br />As the slurry wall will act to block current groundwater flows, the groundwater elevation may <br />increase outside of the eastern end of the wall. To help reduce groundwater flows around the end <br />of the wall and into the backfill area, we recommend that the wall be extended eastward until <br />bedrock contact at the bottom of the wall is at the elevation of the groundwater surface recorded at <br />M-30 plus the anticipated increase in groundwater elevation. <br />Please call if you have any questions or comments. <br />Sincerely, <br />ROCKY MOUNTAIN CONSULTANTS, INC. <br />~~ ~~h~ <br />Bruce Marshall, P.G. <br />Sr. Project Hydrogeochemist <br />BM:sp <br />F 43756 OOASWrryWall 2.wptl <br />