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REV105268
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REV105268
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Entry Properties
Last modified
8/25/2016 1:16:53 AM
Creation date
11/22/2007 1:24:51 AM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
M1988112
IBM Index Class Name
Revision
Doc Date
6/20/2000
Doc Name
REVISED STORMWATER MANAGEMENT SYSTEM SAN LUIS PROJECT PN M-88-112
From
DMG
To
BATTLE MOUNTAING RESOURCES INC
Type & Sequence
TR29
Media Type
D
Archive
No
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iii iiiiiiiiiiiiiiii • <br />STATE OF COLORADO <br />DIVISION OF lv11NERALS AND GEOLOGY <br />Department of Nmural Re<ources <br />I i I ;Sherman SL. Room _15 <br />Dam eq Colorado 80203 <br />Phone 1303)8h6-3567 <br />FAS. ISU31 N32-8106 <br />June 20, 2000 <br />1~ <br />D I V 15 1 0 V O F <br />MINERALS <br />Sc <br />GEOLOGY <br />0.ECLA MATIpN <br />MINING•SAFETY <br />Mr Bill Lyle 6111 o..rns <br />Gnvrrnor <br />Battle Mountain Resources Inc <br />Gri; E. lValdrer <br />PO Box 1627 E.z<„r„e D„e<+„r <br />Battle Mountain N V 89820 ~+~<n,el e. wrtti <br />Dw~sion Dueclor <br />Re: Revised Stormwater Management System, San Luis Project, M-88-112 <br />Dear Mr. Lyle: <br />The Division received and reviewed BMRI's Technical Revision 29 (T.R.-29) submittal <br />regarding a request to construct (or revise) new detention and retention ponds and a stonrtwater <br />conveyance channel to route stormwater runoff from the upgradient watershed areas (from the <br />West Pit) through the West Pit to two retention ponds and through the existing BMP (drop <br />structure and culvert) to the Rito Seco. The revised stormwater management system was <br />necessary due to the recent construction of a diversion system across waste dump "C" and the <br />construction of the ponds and R!O facilities within the West Pit. Stormwater runoff into the West <br />Pit would have exceeded the outlet capacity of the existing stotmwater management system as a <br />result of the recent construction activities. <br />There are a couple of items that need to be addressed: <br />1) The text of T.R.-29 contains references to various drawings that are confusing. For <br />instance, on page 4 (second to the last paragraph) it is stated that "drawings 6 and 8 <br />provide additional information on the channel design:' There is no drawing 8 and <br />drawing 6 contains cross section information of the retention ponds, no[ the channel design <br />(that is contained on drawing 5). You refer to drawing 8 on pages 4 and 5. Please address. <br />2) It is stated in T.R.-29 on page 2 that previous documents "provide the watershed peak flow <br />and cortesponding runoff hydrograph into the West Pit area." However, according to the <br />submittal, it is stated that "the resulting peak runoff from the upgradient watershed is <br />approximately 152 cfs" which does not appear to represent the projected peak flow from <br />the referenced documents. The watershed upgradient of the Pink Gneiss area is projected to <br />contribute 172 cfs (from [he Interim Evaporation Pond System Design submittal) and the <br />watershed above waste dump "C" is projected to contribute 72 cfs. This amounts to 244 cfs, <br />not 152 cfs. The difference may be because the diversion ditch in the West Pit was <br />designed for the 100 year, 24 hour event not the 10 year, 24 hour event (a 2.4 inch <br />precipitation event versus a 1.9 inch event). Please address. <br />
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