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05/29/96 15:56 FAX 916 387 0802 DAMES & MOORS Z0O3 Presented below is breakdown of the scope of work by subtask. The subtasks are presented on a per day basis. Please tote that the time estimates are approximate and will be dcpendent on Held conditions. Day I �vI vi I9' ° 1, The existing depth of approximately 4I7 feet will be verified by tagging bottom. The depth will be Memoramdutn by D rmomitored prior D and following each activity, and the observations recorded on the Dally Field ames & Moore. 2_ The caamg will be wire brushed by BUR to remove scale. 3. A footing or floor for grouting will be placed at the existing total depth of the well by Beylik. The floor will be placed by trying either a grout basket or pea gravel to approximately 412 feet below gfound surface(bgs). followed by a sand bridge to approximately 410 feet. Bentonite pellets will be available for use if there is difficulty in establishing a floor. ' 11 4. Using a tremae supplied by Beylik drd1mg,grout will be pumped by Halliburton auto the first lift from bel m be feet. The grout volume will be calculated to ensure that the grout sets a minimum of 5 feet below the lowermost interval to be perforated. which is from 362 to 370 feet bgs. The purpose of this lift is to provide a plug as a secure base for grouting the remaining two lifts A -plug back spot cemertt"hay been designed by Halliburton specifically for this purpose on this project. It consists of a sant/and cement mix of 50 pounds of sand per sack of Halliburton Premium Cement, with 2 Percent calcium chloride added as an accelerator. The design density of this grout is 17.1 pouts per gallon actual density will be measured using struck-mounted densimeter and documented int the Daily The Field Memorandum. The grout will be tagged after setting, and additional grout added as This grout Plug will be allowed to set overnight. �ry 5. The second, or middle lift from 375 feet to 150 feet bgs will be grouted using a 14.2 pounds-per- gallon mix designed by Hallibunom This mix will consist of a 50150 mix of Pomtix A and Premium Cement with two Percent gel. A retardant will be added in an amount specifiW by Halliburton to ty time. The grout will be placed using a tremie supplied by Beylik allow for a 5 to 6 lour workabili 3 3 y and pumping truck Provided by Hali tburion. The density of this grout as placed will be measured and noted in the field records. In the event groundwater is displaced to the surface, this water will be l �/ retained by BeYlik and transported to the lined evaporation ponds located on site. The grout volume will be calculated based on the casing volume plus 30 percetm to allow for grout taken up into the annular space and formation. In the event additional grout beyondthe calculated amount is required, additional material can be supplied by Halliburton within 4 hours. 1_cv�