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GENERAL35216
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GENERAL35216
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Last modified
8/24/2016 7:56:18 PM
Creation date
11/23/2007 8:14:47 AM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1981018
IBM Index Class Name
General Documents
Doc Date
6/4/1981
Doc Name
Proposed Decision and Findings of Compliance
Permit Index Doc Type
FINDINGS
Media Type
D
Archive
No
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Short Circuiting <br />All ponds have been designed with inlets and outlets as far apart as design <br />would allow. The three Refuse Disposal Area ponds shown on Map 77, however, <br />have not provided sufficient distance between inflow and outflow points to pre- <br />vent short circuiting. Each pond will exhibit the effects of short circuiting <br />from at least one of its inflow ditches. This observation was made using a <br />L:We ratio, where L=Length from inflow to outflow, and We=Effective length cal- <br />culated from surface area of the reservoiralength. This ratio should not be <br />less than 2.0. The Refuse Disposal area ponds did not meet this criteria. <br />In order to forestall short-circuiting effects, the applicant must provide baf- <br />fling for each of the Refuse Disposal area ponds (See "Stipulations" in this <br />section of the TEA). <br />Effluent Limitations ~ ~ <br />On page II C-65 of the permit application, the applicant states that "a sampl- <br />ing crest gage will be installed at the outflow of each sediment pond and will <br />be checked monthly". Each sample will be analyzed according to information <br />presented in Table II. C-8 of the permit application. <br />In addition to the proposed monitoring program, all discharges will be monitor- <br />ed in accordance with the anticipated NPDES permit requirements. <br />Emergency Spillway <br />The ponds and primary spillways are designed to pass the 10 year-24 hour run- <br />off event without outflow through the emergency spillway. One foot of free- <br />board has been provided between the riser crest and emergency spillway. Calcu- <br />lations in Illustration 6 and drawings on Map,80 of the R4 pond are not con- <br />sistent when giving the emergency crest elevation. It was assumed that the <br />crest was to be set at elevation 5,507 feet, M.S.L. and the top of the embank- <br />ment at 5,510 feet, M.S.L. in order that proper freeboard requirements are ob- <br />served. The Refuse Disposal Area ponds, which do not have embankments in ex- <br />cess of ten feet in height, have emergency spillways designed to safely pass <br />21 <br />
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