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U^ • • III IIIIIIIII IIII III 999 Assumptions for Perry Pit Bond Recalculation - 3/5/96 1. Backfilling of southern and eastern boundaries. A 25' setback 25' deep must be created (625 SF/linear foot) along the southern boundary, in addition to the 937.5 SF to be added to create a 3:1 slope (25' deep, 75' wide) along both the southern and eastern boundaries. This equals: 600 LF (1562.5 SF) = 937,500 CF (southern boundary backfill) 700 LF (937.5 SF) = 656,250 CF (eastern boundary backfill) Total material to be backfilled: 1,593,750 CF = 59,027 CY The average push equals 400 feet. (See pictures for details) 2. Cut and fill of northern and western boundaries. Cutting back the slopes along these boundaries to 3:1, where the water is 25 feet deep, means that 1/2 x 37.5 x 12.5 = 234.37 SF to be moved per linear foot of shoreline. 1300 LF x 234.37 SF = 304,687.5 CF = 11,284.7 CY to be cut and filled. The average push equals 400 ft. 3. Revegetation. Approximately 6.9 acres of the Phase I area are currently lake, leaving approximately 15.6 acres disturbed which will need revegetation. The seed mix is taken from the reclamation plan, with seeds and seedlings of trees and shrubs added to the mix at a rate of lpls/acre or 1 seedling/acre. 4. Dewatering of the pond, assumptions The area of the pond at this time is 300,000 SF. It is 25 feet deep, the total volume being 7.5 million CF or 56.1 million gallons. The average 75hp pump with a lift of 25 feet can pump at the rate of 150,000 gallons/hour. In an 8 hour day, 1.2 million gallons of water can be pumped out of the pond. The pump costs an average of $37/hour while pumping and $5/hour when at rest (operator and maintenance costs added). At the rate of 150,000 gal/hr, it will take 23.37 days for two pumps to dewater the pond. 374 working hours x $37 = $13,838.00 748 ownership hours x $5= $ 3,740.00 Total: $17,578.00, approximately. The NPDES permit to dewater the pit will cost $5,000.00. ~ 8ack~r~Gh~ ~, i ~a~ L~5 ~S SF ?S [": 1s' ~ r..~ ~~, ;~ ~aY.o~ ~"= 2eD~ r 40e 30°~ 300 ~a~+ i~~ Leo r 3eo' m -l I7~o~ --~1 Iv