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<br />Space projects. The remaining volume will not be filled. The side materials on the north and south <br />edges will be regraded over this inert material to produce the 3:1 or better sideslope. <br />Proposed Project Schedule: It is our intent to excavate [he Sombrero Marsh materials over the next 3 <br />to 5 years depending on availability of funding and backfill these materials into the North Clay Pit site. <br />Post Minine Site Confi uration: The purpose of filling and regrading the North Clay Pit area is to <br />develop the site into a hilltop that gently slopes to the east to the present gravel access road. Due to [he <br />shape of the North Clay pit, the fill material from Sombrero Marsh and other Open Space projects will <br />fill approximately %: of the present void. By regrading the clayey-gravel side slopes over this inert <br />material and ground shaping, the final hilltop will generally slope to the east. This gently; slope to the <br />east with a minimum of 3:1 side-slopes will be easier to revegetate and maintain. Periodically during <br />the fill operations, the inert fill placed in the pit area will be regraded with heavy earth moving <br />equipment (bulldozers and /or motor graders) to consolidate the materials and remove amr voids. <br />This reclamation plan is compatible with the present approved Jenkins Site Reclamation Plan. <br />Topsoil Needs: We presently have a permit from the State of Colorado Health Department to use <br />City of Boulder Water Treatment Plant Filter fines as a top soil amendment. This material will be <br />blended into the top cover materials and then the area seeded with native grasses. We are confident this <br />reclamation effort will produce a quality short grass prairie. We have used the filter fines amendment <br />method to reclaim the North Processing Plant area (5 acres) just southwest and adjacent to the North <br />Clay pit. Your last inspection of the old North Processing Plant area did not produce any comments <br />concerning this reclaimed area. <br />Attached is a layout of the proposed Jenkins Pit Gate Sign for your review. <br />Affidavit: We hereby certify that all materials placed into the North Clay Pit area will be clean <br />and inert fill as defined by Rule 1.1(20). <br />If you have any questions, do not hesitate to contact me. <br />Sincerely, <br />.c <br />Glenn D. Camere, P.E. <br />Project Manager <br />Attachment: Gate Sign <br />owl, sp~..~,~ w,rdr~~ <br />