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.~ ~ ~ ~' • iiiiii i-i mini • ENGINEERS GREELEV NATIONAL PLAZA 822 7TH STR EET GREECE V, COLORADO 80631 130313568362 May 24, 1982 Mr. James B. McArdle Colorado Mined Land Reclamation 423 Centennial Building 1331 Sherman Street Denver, Colorado 80203 RE: Siegrist Construction Company Sand and Gravel Pit Your File No. 82-15 Dear Mr. McArdle: MAY 2 ~ 1982 MINED LAND RECLAMATION Colo. Deot. of Naturzl Reso~!rce~ I am in receipt of your letter of May 18, 1982 with attachments wherein additional questions and/or concerns were stated regarding the subject applica- tion. Those matters raised in your letter are answered by this letter. Your letter-Item A.-Exhibit E-Reclamation Plan: The operator intends to replace the excavated areas adjacent to St. Vrain Creek as shown by Section A-A of Sheet 3 of 3 of the plans submitted with the original application. That section shows a maximum slope of 3:1 of the replaced material consisting of the overburden. The overburden material at the site remains reasonably stable at this slope or a flatter slope when placed in lifts not exceeding six inches, and with the backfill material benched at 2' vertical intervals into the slope of the excavation line (approx. 2-1/2 horiz. to 1 vertical) shown in Section A-A. Placement of the material in shallow lifts allows for numerous passes over the material with the heavy dirt moving equipment which results in substantial compaction of the replaced material. Asa result, the replaced material will be in better shape than the original soil and will be much less erosive than the natural state of the material now adjacent to the creek. In addition, the replaced material will be seeded as soon as practicable after placement to increase the stability. There is no guarantee that the St. Vrain Creek will not overtop the remaining stream bank and the replaced materials since the embankment cannot be increased in height above the historical elevation. The operator believes that selective material placement on benched slopes, compacting with heavy equipment, and careful seeding to obtain a dense revegetation will provide greater bank protection than exists on the present stream banks. Memo dated April 8, 1982 from Division of Wildlife to Your office: The operator intends to protect the integrity of the stream as shown by his application, the plans, and the included "Reclamation Standards." In fact, by providing carefully placed material and seeding to obtain vegetation as outlined herein, the integrity of the stream bank will be enhanced. This is especially