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filter pack). Vertical positioning of the well screen will be determined from <br /> direct observations of the continuous core relative to permeable granular <br /> aquifer materials. <br /> Where an entire well cluster is scheduled for replacement (i.e., the PW24 <br /> cluster), a single pilot borehole will be drilled. A continuous core sample <br /> will be collected as previously described for each preselected screen <br /> interval based on the current PW24 well logs. <br /> All of the pilot borehole drill cuttings returned to the surface will be <br /> stockpiled on plastic sheeting or within a plastic lined mudpit for <br /> disbursement or disposal pending receipt of the stockpiled soil analytical <br /> results. The pilot boreholes will be abandoned by bentonite grout slung <br /> tremmied up from the bottom to the top of the borehole. <br /> o As suggested by Mr. Gene Dworzanski of Glenn Springs Holdings, Inc. <br /> and discussed during the 1995 Annual Program Meeting, stainless steel, <br /> V-shaped, wire screens will be used rather than the low carbon steel <br /> screens proposed in the workplan. <br /> o After well intake designing has been completed for all of the scheduled <br /> replacement wells, the well installations will be performed as originally <br /> proposed in the workplan. The only change will be that appropriately sized <br /> transitional sand will be placed above the predesigned filter pack sand <br /> prior to the placement of the bentonite seal. <br /> o As built drawing and specifications of the replacement wells will be <br /> provided in the next available Semi-Annual Report following completion of <br /> the wells. Uthologic materials description borehole log will accompany <br /> each of the as built well drawing and specification figures. <br /> I trust that these responses adequately address your concerns and meet with your <br /> approval. Should you have any additional questions or comments regarding this matter <br /> please do not hesitate to call me at (209) 983-6810. <br /> Sincerely, <br /> T'rre/aTek-CRA Company <br /> Robert T. Siegfried, , CEG <br /> Project Geologist <br /> cc: G. Oworzanski E. Friedrich <br /> A.C. Ying <br />