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for borrowing, placement, and spreading of relatively impermeable soils, a cost for installation of <br />geomembrane and geomembrane cover fill as needed, and a cost for importation, placement, and wrapping <br />of drainage gravel. In order to estimate these costs, Henderson must provide the following information: <br />a) Are there suitable low permeability solls available onsite, and if so, where are they Located? Are they in <br />stockpile or in-situ (the latter would require a boaow pit and borrow pit reclamation)? What tests were <br />performed to detemune the status of these soils. Please provide results of those tests. <br />b) If low permeability soils are not available onsite, costs to purchase and haul in suitable soils must be <br />included in the estimate. <br />c) What volume of relatively low permeability soil will be required [o prepare the repositories? <br />d) Will geomembtane lining be required? If so, what volume of geomembrane cover fill will be required? <br />e). Provide an estimate of quantities of drainage gravel and geotextile to be required. <br />5. 3.2.3 FW Cost Reduction- On Site Disposal: Henderson states that after reviewing actual and contractor- <br />bidcosts for structural demolition and on-site disposal at Climax and other non-CMC mining operations, <br />DMG accepted $0.13/cubic foot as a unit cost for demolition and disposal for FW purposes at the Climax <br />Mine. Upon further review of the Climax reclamation cost estimate, at no time did the Division agree to <br />use a unit cost of $0.13 per cubic foot including the cost of concrete demolition. As can be seen in the <br />March 12, 2000 memo to the file and suppoRing attachments, the Division recalculated superstructure <br />demolition costs based on a range of $0.1090 to $0.1755 per cubic foot, depending on the height and <br />composition of the stmcture. In addition, the cost to demolish concrete foundations was included as a <br />sepazate line item, $2.50/CY was used to drill and blast all foundations in place and $2.00/CY was used to <br />cover foundation rabble in place (the Division was confident that enough fill exists on site at the Clitttax <br />Mine to cover the demolition debris). <br />Based on what was calculated at the Climax Mine using the Division's CII2CES estimating software, the <br />Division will apply the same principal at the Henderson Mine. Depending on the height and composition <br />of the structure, costs will range from $0.106 to $0.205 per cubic foot for the supetstmcture. See attached <br />2002 Demolition Menu Table for further detail. <br />in regards to concrete disposal at the mine and mill, the Division described the concrete demolition costs in <br />the summary sheet attached to the estimate. The description below describes the variance from the <br />CIRCES program and the Climax bond estimate: <br />Concrete blasted and buried- CIRCES costs for concrete demolition and disposal in an existing pit withirz <br />SO feet are as follows: 6"slab @ $13.97/sy, 8" reinforced slab @ $18.153/sy, 10"reinforced slab @ <br />23.29/sy, 12"reinforced slab @27.95/sy. These unit costs compare to the $4.50/sy cost used in the year <br />2001 estimate jot the Climax Mine derived as follows. Calculate the total building footprint size in sy. <br />Unit cost to drill and blast thick and heavily reinforced foundatioru at the Mid-Continent reclamation job <br />was $2.50%y. This yields a unit cost of $2.50/sy of foundation area assuming 3 foot [hick concrete. Cover <br />rubblized foundations w/3' of clean fill at a unit cost of $2.00%y, which is equal to $2.00/sy. The sum of <br />the rubbliZing and cover unit costs yields $4.50/sy. Based on discussions with Division staff experienced in <br />drilling and blasting foundations for reclamation, the $4.50/sy cost is low and the CIRCES costs are too <br />high. Sec. 380-8100 Means Blasting Crew, floor demo max = $1.05/sf. Means Sec 875-5550 On site <br />disposal @ $5.44/cy assuming an average thiclotess @ I.5 f. for slabs, translates [o $0.30/sf. Cose for aQ <br />floor demolition and disposal !s $I.35/sf. <br />Based on the above mentioned information regarding the demolition of concrete, the Division will <br />continue to estimate this cost at $1.35/sf (including the 89% location adjustment factor). The total cost for <br />demolition of concrete at the mine and mill sites is approximately $709,958.00. <br />6. 3.2.4.1 Materials Testing for On Site Disposal: Henderson estimates $100 per TCLP test with a total of <br />40 samples. The Division contacted our contracted lab, Analytical. Group, for an estimated cost of TCLP <br />testing. The cost for the 8 RCRA Metals and TCLP Extraction was quoted at $200 per sample. This is <br />double the cost proposed by Henderson. At this time, the Division will adjust the bond to reflect an <br />increase of $8,000 for the 40 samples. <br />