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Location <br />Acres <br />East Pit <br />15.40 <br />West Pit <br />9.85 <br />Total <br />25.25 <br />Valco, Inc. <br />March 29, 2011 <br />Page 2 <br />The volume calculations suggest that there is a material surplus of approximately 3,600 cubic yards. Volumes <br />should be considered accurate to plus or minus 10 percent due to accuracy of the base survey plan and the <br />volume calculation software. We have not attempted to determine the suitability of the onsite material. It may <br />be that portions of the soil are unsuitable for recompaction in final reclaimed slopes. Access to much of this <br />material will require dewatering or dredging of the pits. <br />Based on the assumptions below of the water surface elevations, the estimated area of exposed water is provided <br />below. As the water level fluctuates seasonally, the surface area will decrease when levels are lower and <br />increase when levels are higher. <br />Assumptions: <br />Exposed Water Surface Areas <br />1. Material shrink and/or swell corrections have not been applied. Existing material density was <br />considered to be the approximate reclaimed density. Note that during earthmoving and grading work, <br />some material loss should be expected. <br />2. Water levels are 5,232 ft in the west pit and 5,225 ft in the east pit. <br />3. Surface elevations outside the pits will be regraded to original ground surface. We have estimated these <br />elevations from the surrounding ground outside the disturbed limits. <br />4. The marsh area has a depth of 18 inches and will be filled to 18 inches above the existing water line (3 ft <br />of total fill). <br />5. Slopes will be no steeper than 3:1 from 5 feet above the water level. The volume estimates assume a <br />3:1 inclination from the crest of slope. In some areas this distance may be greater than 5 feet. <br />Sincerely yours, <br />LYMAN HENN, a division of Brierley _";��� es, LLC <br />Mr. Nathan C. Soule, P.E., P.G. <br />Senior Engineer <br />Attachments — Figures 1 -6: East an <br />G:\PROJECIS\L10082 -000 Valco Gravel Pit Restoration \R all \Valco Volume Estimates Letter.docx <br />4r <br />r. Ste n, C. Kuehr, P.E. <br />Division Manager <br />iew, Isometric View, Typical Sections <br />