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Whetstone <br />Associates <br />Technical Memorandum <br />COST <br />Hayward Baker and Whetstone Associates provided the following cost estimates for grouting the <br />corehole at the Schwartzwalder Mine: <br />Table 3. Cost Estimate for Coreho/e Grouting <br />1. Hayward Baker Costs <br />Mob/demob $5,000 <br />Daily rate $3,500 <br />Materials $ 500 <br />Total $9,000 <br />H. Whetstone Associates Costs <br />Mob/demob $ 675 <br />Daily rate $ 900 <br />Meals & Lodging $ 100 <br />Incidentals $ 80 <br />Total $1,455 <br />The cost of materials shown in Table 3 is estimated based on the expected volume of annular space <br />and grout penetration into fractures. Clearly, the volume of materials will be very low if the <br />fractures surrounding the corehole are not extensive, but could be high if the grout penetrates out <br />into the fractures. It is Cotter's goal to grout any fractures that may be connected to the corehole, so <br />using a high volume of grout could be necessary for the overall goal of reducing permeability in and <br />around the corehole. Extra material will be brought on site in case it is needed, and any unused and <br />undamaged material will be returned to Hayward Baker at no cost to Cotter. <br />REFERENCES <br />Army Corps of Engineers, 1984. Grouting Technology, Engineer Manual No. 1110-2-3506. <br />4109C.110106 5