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_ iiiiiiiiiiiiiiiiiii r <br />LORADO <br />;, STATE OF CO <br />D4Y1~ N OF MINERALS AND GEOLOGY" <br />Deparlmem of-4aw[al Resuurces ~~rl~~ <br />131 3 Sherman $L. Room 215 <br />Ucnver. Colorado 80'_03 <br />Fhunc: 13031 866 3567 <br />FAa: 1303) tf3'_~R106 <br />" ~~~>~~~ DEPARTMENT OF <br />March 12, 1997 /_ Qiv~`{'= ~$OLJ(Z~ $ <br />Roy Romer <br />John Ackerman eo. ernnr <br />Colorado Department of Transportation lamer S. Lochhead <br />E ~enmre Direaor <br />222 South 6th Street, Room 31 7 F' ( eo~~~ <br />Grand Junction, Colorado 81 501-2769 / u~ I `c ~ e "°`naei R E°°F <br />/ Drvlsinn Dneanr <br />RE: Spring Creek Pass, Permit No. M-96-00~ Technical Revision No. 1 Adequacy Review <br />Dear Mr. Ackerman: <br />The Division has reviewed your application for technical revision (TR-0011, addressing installation <br />of sediment control structures at the Spring Creek Pass Pit, and has the following comments: <br />1 . Please provide specifications of the fill indicated on the map. As I recall, this area was <br />subject to heavy erosional flows last spring and will require a significant, non-erosive <br />structure to direct flows around the nearly 90 degree turn that exists at that point. The <br />native non-cohesive material that last years berms were constructed of, may not be adequate <br />for this structure; <br />2. Please extend the contour lines on the map, well beyond the permit boundary, so effects <br />of the concentrated flow from the diversion ditch outlets can be evaluated; <br />3. Given the unconsolidated, non-cohesive nature of the materials available for construction <br />of these structures, the site will need to be inspected as soon as it is accessible in Spring <br />1 997 to evaluate the effectiveness of these structures. <br />Please respond to these comments by March 21, 1997 so the decision due date of March 26, 1 997 <br />can be met. <br />If you have questions or need additional information, please contact me at our Durango Field Office, <br />484 Turner Drive, Building F, Room 101, Durango, Colorado 81301, phone no. (970) 247-5062. <br />Sincerely, <br />-~ /~ <br />Steve S. Shuey <br />Environmental Protect Specialist <br />