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999 <br />.:IG NARD D LAMM <br />GOV[RNOR <br /> <br />COLORADO GEOLOGICAL SURVEY <br />DEPARTMENT OF NATURAL RESOURCES <br />715 STATE CENTENNIAL BUILDING - 1313 SHER MAN STREET <br />DENVER,COLORAD080703 PHONE (3031839-2611 <br />May 5, 1979 <br />Arapahoe County Planning Dept. <br />5334 South Prince St. <br />Littleton, CO 80166 <br />Gentlemen: <br />JOHN W. BOLD <br />DirsCla <br />RE: CASE 79-22, SUPERIOR SAND & GRAVEL <br />This case involves the rezoning of 65 acres to permit extraction and washing of <br />masonry sand. This tract lies in the NE/4 sec. 11, T4S, R66W, along Sand <br />Creek on flood-plain deposits shown as F3 on the Colorado Geological Survey <br />gravel resources map of the Coal Creek quadrangle. Our well log data indicate <br />up to 25 ft of sand in the Sand Creek valley fill, but Superior's test hales <br />showed thicknesses up to 42 ft. So, the flood-plain deposits here are quite <br />thick and plentiful. Mining is not a new or unusual land use in this area. <br />At least 14 other sand pits have operated along Sand Creek. According to the <br />City of Aurora's comprehensive plan, the tract is currently designated as open <br />space, a transitional use that will support flood-plain conservation and mining <br />as a temporary use. <br />The mining and processing of this sand is much less intensive than in conventional <br />sand and gravel pits because the material is fine grained, requires no crushing, <br />and needs only screening and washing. Consequently, such problems as machine <br />noise and fugitive dust are greatly reduced. Taking advantage of existing <br />vegetation will reduce the visibility of the washing plant and stockpile sites. <br />The sequential mining plan will permit rapid and nearly simultaneous reclamation <br />of the excavated parcels. <br />I see no serious geologic problems involved with this proposal and would <br />recommend approval of the rezoning. <br />Sincerely, <br />SDS/ba <br />Stephen D. Schwochow <br />Engineering Geologist <br />GEOLbGY <br />Cv'o~ ~c n.r ~:. rT CEO Tn •~~E TUTU RE <br />