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<br />In addition to the disposal of the CKD in the mined pits, Fremont Sanitation District has b~e~en~nnttted~~ 1~ <br />to dispose of its sewag~, from the neazby treatment plant, in the CKD disposal areas. This sludge <br />is delivered to the site in a tank truck and then sprayed over the CICD. The water from the sludge <br />combines with the CICD to form a hardened crust on top of the CKD piles. This serves as daily cover for <br />the CKD and is an effective dust control measure. In addition, the pH of the CKD effectively kills any <br />remaining bacteria or pathogens in the treated sludge. Across-section depicting the configuration of a <br />typical CKD disposal area and the relationship of the CKD disposal areas, in Cuts 6 and 8, to groundwater <br />is included as Figure 5 in the attached Hydrogeologic Assessment. The location of the cross-section is <br />indicated on Figure 4 of the attached report. <br />3. Closure Plan for the CKD Disposal Areas. <br />Closure of the CKD disposal areas is accomplished by covering the CKD with approximately five (5) feet <br />of broken shale. The shale is placed with dump trucks and then graded using afront-end loader and road <br />grader. Truck and heavy equipment traffic provides additional compacti a. In addition, <br />~~~I~ 17 r~ 1 R ;orhrc nftoocoil is spread over the shale can fThe surface is graded nearly flat with ~ <br />sufficient slope to prevent ponding of rainfall on top of the CKD disposal area. C~ ~,,1~ <br />~/, ~e <br />Reclamation of the CICD disposal areas wilt be the same as the rest of the affected area of the mine. <br />Topsoiling, seeding, revegetation and fertilization will be performed in accordance with recommendations <br />of the Natural Resource Conservation Service (MRCS). NRCS previously recommended the following <br />seeding mixture. <br />Table 1. NRCS Seeding Recommendations <br /> Amounts* (pounds/acre) <br />Species Suggested Varieties Drilled Broadcast <br />Little Bluestein Pastura 1.5 3 <br />Pubescent Wheat Luna 3.5 7 <br />Side Oats Grama Vaughn 2.0 4 <br />Thickspike Wheat Critana 2.5 5 <br />Streambank Wheat Sodar 2.5 5 <br />•Pure Gve seed <br />KS-990J~02 Page 3 K-S &Compsny <br />August 16, 1999 Copyrightl999 <br />