Laserfiche WebLink
<br />• 1`~V Resnonse -Drainage ditches handling flow from above the fill will be removed or abandoned <br />afrer mining operations cease. Ditches handling flow from the fill will remain and were designed <br />using 100-year runoff for the entire area. <br />22. Ditch D6-ld on the map should be labeled D6-la to match EX 15-15. Please review and <br />rrect. / <br />N9 ~w~ ~/. ~7~ J d'am' i ,l ~ r Tr. ~J ~. <br />Resnonse -Ditch has been relabeled. ~ <br />23. From review of figure EX 15-15, it would appear that east fill ditch D-1 will have difficulty <br />aintaining gradient to flow to pond 4-3 given the co~guration of the fill and the pond <br />embankment. Please review and correct as necessary. <br />~`~ Resnonse -Map location of the ditch is not precise. The Ditch will be located in the field to <br />provide adequate slope. <br />24. s required by Rule 2.05.3(4)(a)(iii), please demonstrate how pond 009, with a 13.5 foot tall <br />ankment (EX 15-14) meets the requirements of C.R.S. 37-87-105. <br />~ ~ Resnonse -Pond 009 has been redesigned with a 10-foot elevation difference between ground <br />elevation under dam crest and base of emergency spillway. Sedcad Printouts aze attached and <br />appropriate changes have been made on Figure Ex. 15-14. <br />• 25. lease provide flow and velocity calculations for the outslope of each pond below the <br />emergency spillway as required by Rule 4.05.9(2). Include riprap sizing calculations if riprap is <br />d ~ required <br />Resnonse -See Exhibit 15 summary table showing design details for the emergency spillway <br />receiving channels. Sedcad program for Simons/OSM, steep slope design does not provide <br />velocity information; therefore, where this design was used, no velocity data are available. <br />~6. he Division did not receive structwe networking, structure routing, and structure summary <br />ormation (normally pages 3 and 4) for the following SEDCAD+ design runs; Fill 7 pond, Fill <br />9 pond, pond 2-2, pond 2-3, pond 3-1, and pond 4-3. These pages depict important information <br />~J~ specific to the predicted effluent concentration. Please review and submit the necessary <br />~~~~ • ~ information. <br />(rj 1 ~ <br />Response -Networking, structure routing (where available), and structwe summary information <br />for these ponds is attached. The Sedcad program does not print out structure routing when <br />design flow is input from separate ditch design program. <br />27. EDCAD+ design results provided for pond OOla estimate an effluent concentration exiting <br />~~ volume weightedlaveragetoThe target effluent/limit should beeno greater thanl 5 ml 1.2Please <br />submit new design information for this pond. <br />• <br />