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• ~- a3~~ ~~5~ e~ resP ~~~ ~~~~~~~~~~~~~ ~~~ <br />999 <br />Mesa County Department of Public W- rks <br />Engineering Division <br />.` ,~ <br />750 Main Street • P.O. Box 20,000 • Grand Junction, Colorado 81502-5013 • Ph (970) 2441815 <br />p ctober 6, 2000 <br />Mr Wallace H. Erickson gy puBNC F ~E CIC~ ! Rece)v~ <br />Division of Minerals and Geolo OP <br />701 Camino del Rio F1LE'; M-~ Y <br />Room 125 E~rE: ,. fro Op/ OCT 1 ~ 2~~f7 <br />Durango, CO 81301 .r~,~ vc n <br />F~el~sr, ~ &„{,,~ 7t pry Du nso F'e <br />Dear Mr. Erickson: M011'~ '~~ r- won rM~ner~ 8 Gep ~y <br />Thank-you for the copy of the inspection report for the Surface Rock Pit, permitte to John <br />Schmahl of J & M Schmahl in Unaweep Canyon dated August 30, 2000. <br />Mesa County has reviewed the Observations and the Problem/Possible Violations nd Corcective <br />Actions as noted in the inspection. For purposes of clarification Mesa County off rs the <br />following: <br />As management of water is key in geotechnical stability, Mesa County is a icipating a <br />Grading and Drainage Plan as part of the Geotechnical stability recommen tions. Noted <br />during the field inspection, a general low area along the top of the stock pit appears to <br />collect water as evidenced by the accumulation of fine grained material, ap arently the <br />water resides a sufficient amount of time to allow the deposition of the fine grained <br />material. This condition, if allowed to remain, could be a source for subsu ace water that <br />could jeopardize long-term stability. <br />2. The path for water leaving the site and crossing Colorado Highway 141 wa~unclear <br />during the field inspection. Mesa County is anticipating the recommended ading and <br />Drainage Plan will clarify conveyance of water from the site to East Creek. <br />3. Mesa County agrees the high wall should not be further disturbed with the xception of <br />removing unstable material from the high wall. The rock-trapping earthen erms are <br />strongly recommended as noted in the inspection report. Mesa County and rstood the <br />final reclamation configuration will include reshaping of the entrance to gra es close to <br />15% slopes from the base of the rock-trapping berms to the Colorado High ay right-of- <br />way. The final slope will be determined by using available material from ar and the site <br />and not using material from the stockpile area. This shaping and revegetati n will include <br />reclamation of the road leading into the area as well. <br />