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Jefferson <br />County - . Memorandum <br />1 <br /> <br />1Colorado . ~:~: <br />/ / `, r <br />- -, . <br />i~IVISIOr) ~ NO' <br />1 _; ..~... .. <br />\'•'~ ~ - <br />Public ~`' ~ ~ ' -` <br />~~ . ~- - <br />Works \- ° - - <br />File Date <br />A.R.T. March 8, 1982 <br />' To: Bud Smead - Director of Public Works <br />From.: Public Works Administrative Review Team <br />' Subject: M 80-5 (53.7A Expansion) Cooley Gravel Pit <br /> We have initially reviewed the above referenced case and offer <br />' the following comments: <br /> 1. A large scale map show ing the stages of water diversion as <br /> mentioned in drainage report should be part of report. More <br /> details of the channel construction and its scheduled <br /> construction should be presented. <br />' 2. The diversion ditch as shown on Figure 2 (report) would be <br /> constructed outside of the Quarry area. Permission would have <br />' to be granted for this from property owners. <br /> 3. On channel design show calculations with respect to velocity of <br /> flow and measures to control materials from being carried <br />' downstream. <br />4. Show calculations and details on sedimentation ponding to hold <br />' back developed 100 year flows. - <br />5. Show typical details of culverts co 6e constrtrctea to'include <br />' erosion control measures. <br />6. Show details of drop structures mentioned in Alternate II. <br />' 7. Some sort of a drainage plan <br />progress has to be presented <br />(drainage) details included. <br />t 8. Attached is a Drainage Repor <br />the above. <br /> <br />coincident with prospective mining <br />graphically with typical structures <br />This is to support your narrative. <br />t Format to be followed in presenting <br />1 <br />