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Coulson Excavating Company, Inc. - Bonser Gravel Pit <br />Ezhibit E -Reclamation Plao <br />acres. This calculation is given in Appendix I, as well as a step-by-step calculation procedure for <br />the same calculation with different acreage. Appendix II contains tables for 0.5-5 acre I ft lift <br />water volumes and estimates of water losses throughout the day for each month of the year. <br />Evaporative soil water loss tables were calculated based on a rate 30% greater than pan <br />evaporation. Pan evaporation for the area is 40 in yr' (NOAA, 1982) The 30% increase is due to <br />albedo effects (Flillel 1980). <br />The water loss tables are to be used as a general guide to estimate the amount of water to have on <br />site to moisten liner material if it becomes too dry, or to estunate the amount of tune the lift needs <br />to dry if the material is too wet. Moisture content measurements are to be used to estimate <br />moisture loss and to determine how often moisture content measurements should be made. For <br />example, if the soil needs to lose 3% moisture content before compaction, and field personnel <br />determines form the charts in Appendix II that is should take about 1.5 days to evaporate that <br />amount of soil moisture under clear skies, then moisture content measurements should be made at <br />the end of the fvst day and every few hours during the second day <br />-f the soil moisture becomes too dry during compaction (I % dry of optunum) as predicted from <br />the charts in Appendix ~, then a volume of water calculated to raise the moisture content by 1 <br />will be applied evenly over the entve lift surface. <br />The lake is to be filled following the termination of pumping, and after complete rejuvenation of <br />the surrounding water table. <br />Topsoil and Overburden Handling <br />As shown on Figure 1: Exhibit D, gravel extraction is expected to proceed sequentially from <br />south to north, from Pit 1, to Pit 2, then to Pit 3. The maximum volume of overburden (topsoil + <br />subsoil) to be stockpiled at any given time is about 687,327 yd3. The stockpile around the perrmit <br />area will measure approximately 6,749 ft long, 20 - 30 ft high, and 40 - 50 ft wide, with 0.5:1 <br />side slopes. The stockpile will surround the pit as shown in Figure 1: Exhibit D <br />Topsoil and overburden removal will begin one year after permitting, with gavel removal <br />starting 30 to 60 days later. Approximately 205,468 yd3 of overburden will be salvaged and used <br />in reclamation. All remaining overburden will be placed in the north portion of the permit <br />boundary. <br />Salvaged overburden will be graded and compacted onto the slopes of the pit area at a 2: I slope. <br />Prior to gravel extraction, overburden will initially be stockpiled along the permit azea (see Figure <br />1, Exhibit D). Overburden will not be replaced until the entire 65 acres of the permit area have <br />been mined. The haul road will also be reclaimed to pasture grass by disking of the road, and <br />placing 1.0 ft of overburden on top of it. After topsoiling, the land will be seeded with a native <br />seed mix. <br />The overburden stockpile will be seeded with the seed mix below, hay mulched and crimped to <br />minimize erosion. An aggressive mowing program will control noxious weeds on the stockpile. <br />The maximum volume of shale to be stockpiled at any given time is about 215,914 yd3. <br />Seeding aad Ferfiliziteg <br />