2007-06-08_REVISION - M2006072 - Laserfiche WebLink

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®~® 'rJA®~~` W.W. ENTERI~RISES 2115 9th Street, P.O. Box 1242, Limon, Colorado 80828 (719) 775-9314 REGP~ IJUN 0 8 ZpO~ Division o~ .. Mining are May 30, 2007 Project No. 07-0982 Mr. Jeff Schumacher 831 Pazk Street Sterling, CO 80751 Re: Minimum set back recommendations for the gravel pit (Schumacher Pit #3) located in the W'h of Section 11, T11N, R52W of the 6'}' P.M., Logan County, Colorado, pernvt #M-2006-072. Deaz Jeff ; This letter is to follow-up our conversations, concerning the above referenced gravel pit. The minimum separation from any man-made structures, including the agricultural storage lagoon, to the north edge of the gravel pit was addressed. The depth of the storage lagoon, existing and proposed topography, and soil types at the site aze all important factors used to determine the needed separation distance. From the original design documents, the storage lagoon has a 20' depth (181iquid depth with 2' freeboard). The berm closest to the gravel pit is approximately 10' wide and 2' above the adjoining grade outside of the lagoon. The adjoining grade extends 65't to where the edge of the gravel pit is desired. Other man-made structures at the agricultural site aze barns and grain bins. All of these structures aze farther from the proposed gravel pit than the south berm of the lagoon. The gravel pit will-be-sloped at a maximum 3 to 1 slope from this point. The inside of the lagoon is also sloped at a 4 to 1 slope. The lagoon is lined with a clay, liner. The soil in the azea is a gravelly sand. The existing azea where the gravel pit is to be located is a sloped azea with many ravines in the gravelly sand soil. Some of these ravines appeaz to be deeper than the proposed final slope grade. The "fingers" between the ravines are to be removed for their gravel. The final slope of the azea is to be kept at a maximum 3 to I slope after the azea is mined.