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Y ~~ w r~ ~~ ~~ ~~ w -: TUTTLE APPLEGATE RINDAHL, INC. Consultants for Land and Resource Development Mr•. Derv i d Ber•r•y May 22, 1'387 Rage 2 4. c. We have not provided infar•rnation on engineer•inq design of the side channels at this time. This application is far^ a permit to min©. If approved, wo will pt•epar^e final engineering plans detailing the improvements and protectlort that will be constructed. The locations and number of spillways are approximate and are based on past mining plan=_~ of similar scope along the 6outh Platte River. We feel it is appropriate to only go into the stage of fine]. engineering once permits have been aoor•oved. Otherwise the expenditure of time and money buys the applicant nothing. 5. We concur- with allowing a maintenance easement far• the UDFCD. There will also be a 25 foot easement for the South Platte River trail, which we assume will be available far• driving maintenance vehicles slang. 6. Third Creek, like any drainage is a problem, but we do net see it as a rna,7or problem. Any' development that takes plar_F_+ uostr•eam should be responsible for- developing adequate drainage facilities and detention ponds. Regardless of what the final hydrology report for the area is, we shauld net be expected to be responsible for other development in the~> area. Our• pr•o~ect should be able t~~ safely control cur•r•ent levels of runoff with some prevision far an increase in volume in the future. AJpstr•eanr development shauld be responsible for maintaining historic peak. discharges. 7. We cancer that consideration should be given to design on water entering and leaving the lakes. We actually see this as an apportunity far the UDFCD to control drainage on a regional level. The original FNAD done by Gingery calculates aporoxirnately 1,500 acre-feet of runoff generated by Third Creek during a 100 year storm. The lakes createel by mining will have a total storage rapacity of approxirnately 800 to 900 acre-feet above the normal water surface elevation. These lakes would serve as a nra~or• detention facility that would regulate the release of water to the South Platte which should be beneficial. FInal engineering does need to be done on a channel rundown intca the lakes ar~d the overflow spillway inter the South Platte. Again, we do n~~t feel it is appr•opr•iate tc~ expend fees on final engineering design before a permit is obtained. These plans and details will be prepared once we ar•e assured that mining is permitted.