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2008-12-16_REVISION - C1981022 (3)
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2008-12-16_REVISION - C1981022 (3)
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Last modified
8/24/2016 3:39:00 PM
Creation date
12/19/2008 1:29:34 PM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1981022
IBM Index Class Name
REVISION
Doc Date
12/16/2008
Doc Name
2nd Adequacy Review
From
DRMS
To
Oxbow Mining, LLC
Type & Sequence
TR60
Email Name
MLT
Media Type
D
Archive
No
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Elk Creek Mine TR-60 <br />2nd Adequacy Review <br />16 Dec 2008 <br />Page 2 of 9 <br />Division requests that the presence and quantity of groundwater inflow into the <br />shaft be measured and reported to the Division on a monthly basis during, if <br />possible, and after construction of the shaft.. <br />3. The text at the beginning of Section 9 of the TR-60 submittal states that the entire <br />Bear Creek fan site is a small area exemption (SAE). However, the hydrology <br />designs presented in TR-60 designate only three portions of the disturbed area as <br />SAES. Other disturbed areas, such as the cut slopes and pad area, are not <br />designated as an SAE on Map 2.05-El-BCA2, nor are there any Sedcad designs <br />for them. Please revise Map 2.05-El-BCA2 to indicate that the entire disturbed <br />area is designated as an SAE and provide appropriate Sedcad designs for the <br />remaining disturbed areas. <br />In the November 26, 2008 submittal, Oxbow stated that the cut slope was <br />considered part of the recently added proposed light use road construction and, <br />therefore, does not need small area exemption designs per Rule 4.05.2(3). As <br />mentioned in item number 4 below, Oxbow also considers the fill areas at the <br />inlet and outlet of the Bear Creek culvert to be part of the light use road <br />construction and, therefore, do not need small area exemption designs either. <br />However, the Division still requests small area exemption sediment control <br />designs for all of the disturbed areas at this site. Rule 4.05.2(1) requires runoff <br />sediment treatment for all areas designated as "disturbed areas". Rule 4.05.2(4), in <br />part, excludes from the definition of "disturbed area" those areas that only consist <br />of roads. Referring to drawing number 2.05-E1-BCA2, the light use road does not <br />exist alone but is part of the facilities pad. Therefore, the Division considers the <br />cut slope and fill areas at the culvert inlet and outlet to be part of the disturbed <br />area for the facilities pad. Therefore, the runoff from all disturbed areas needs to <br />be addressed per Rule 4.05.2. Please provide SAE designs for all disturbed areas, <br />including the cut slope and the inlet and outlet disturbed areas of the Bear Creek <br />culvert BCC-1. <br />4. Please explain why there is no small area exemption area at the south or outlet <br />end of the Bear Creek fan site culvert, as was done at the north or inlet end of the <br />culvert. <br />As explained in item number 3 above, the Division requests that all disturbed <br />areas be included in the small area exemption designs, including the cut slope and <br />the Bear Creek culvert inlet and outlet disturbances. <br />5. There are no hydrology and sedimentology Sedcad designs for the proposed <br />check dams in drainage channel BCCD-1 to show that the check dams can handle <br />the flow and meet the settable solids limit of 0.5 ml/l. Please provide these Sedcad <br />designs.
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