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INTRODUCTION <br />This report was performed as required by Douglas County so that this site will conform to the <br />County's established drainage and erosion criteria. One report has been compiled for these two <br />systems as the stomtwater management will be provided as a consequence of the erosion <br />control structures. <br />GENERAL LOCATION AND DESCRIPTION OF SITE AND PROPOSED ACTIVITIES <br /> The Stevens Lease Clay Mine is located in the NE 1/4 of NW 1/4 of Section 8, Township 7 <br />' South, Range 66 West of the 6th Principal Meridian, Douglas County, Colorado. This site more <br /> generally located northwest of Crowfoot Valley Road and Lemon Gulch approximately two miles <br /> southwest of Cherry Creek, please refer to FIGURE 1 -Vicinity Map. The 100-year floodplain for <br /> Lemon Gulch is located near the southeast comer of this site, but will not be affected by this site. <br /> The mine site property is an approximately 40 acre parcel that will be mined for a dark red clay. <br /> Approximately 21 acres will ultimately be mined over a period of a minimum of 10 years and will <br />' occur in three phases. In order to minimize negative impacts, only 5 to 10 acre areas will be <br /> disturbed at any time as reclamation wilt proceed before additional areas are disturbed. The <br /> post-mining land will be rangeland and wildlife habitat. The post-mining topography will be <br /> approximately 15 feet below curent grades. The site will be graded such that it will provide <br /> positive drainage and will not exceed slopes of 3:1. <br /> The general mining process will be to remove the vegetation and topsoil which will be stockpiled <br />' for future reclamation use. Overburden material will then be excavated with a dozer and scraper <br /> and stockpiled separately for future backfill material. After each area of approximately 1 acre <br /> has had the clay layer removed, the overburden stockpiled material will be back-filled into the <br /> excavated pit. The stockpiles should be placed on a stable surface and temporarily seeded with <br />' a native seed mixture to minimize erosive actions on the stockpiles. Details of the mining <br /> operation and the reclamation process as well as other impacts of this mine can be found in the <br /> Application For Douglas County Use By Special Review Permit Denver Brick Company Stevens <br />Lease Clay Mine dated January 8, 1996 and submitted by AGRA Earth 8 Environmental, Inc., a <br /> portion of the text from this application is included in the appendix of this drainage and erosion <br /> control study. <br /> <br />1 <br />~l <br />1 <br /> <br /> <br />L1 <br />