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2012-11-29_PERMIT FILE - C2009087
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2012-11-29_PERMIT FILE - C2009087
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Last modified
8/24/2016 5:10:55 PM
Creation date
12/18/2012 8:02:58 AM
Metadata
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Template:
DRMS Permit Index
Permit No
C2009087
IBM Index Class Name
Permit File
Doc Date
11/29/2012
Doc Name
Small Area Exemption Demonstration
Section_Exhibit Name
Exhibit 2.05.3-E2 Appendix 2.05.3-E2.J
Media Type
D
Archive
No
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Septic Area Small Area Exemption <br />Site Description <br />The septic leach field is located just outside the facility perimeter ditch that reports to Pond 003. The <br />area consists of 0.1 acres and, while currently disturbed, has been seeded (as of 11/16/2012) and will be <br />completely revegetated. Runoff from the shop /facilities pad is prevented from reaching the septic area <br />through the use of berms and the perimeter ditch. The only runoff from the area is that which falls as a <br />result of direct precipitation. Because of the small size, a general model was used to run in SEDCAD, and <br />a report was completed for a 1.0 acre vegetated area. <br />Design Analysis <br />For the design analysis, see the description in Attachment 7 -6 -7 — Small Area Exemptions in this exhibit <br />with the exception of item 3; SEDCAD4 contains information regarding a prediction of the amount of <br />sediment removed by a silt fence. <br />Hydrology <br />The hydrology of the area was analyzed using SEDCAD 4 for Windows. Because of the small size of the <br />area, a generic model was used. This generic model consisted of a 1.0 acre, vegetated pad for analysis. <br />A summary table is below. <br />Design Hydrology Summary (1 acre, vegetated pad) <br />Description <br />10 Year, 24 -Hour Storm <br />Precipitation Depth <br />1.7 inches <br />Runoff Volume <br />0.02 ac. -ft <br />Peak Discharge Rate <br />0.31 cfs <br />Sedimentolog <br />Sedimentology was performed using SEDCAD 4, and the initial run showed that some sediment would <br />be leaving the site. Most options considered were not feasible. Constructing a sediment pond for this <br />small of an area would be costly, create unnecessary additional disturbance, and there is no suitable <br />location for a pond structure in the area. Two runs were done for the generic area, one using a check <br />dam as a control structure and the other using a silt fence. According to SEDCAD, silt fences would <br />remove 96% of the sediment, and the check dam 45 %. <br />Particle Size Distribution <br />See individual SEDCAD runs as well as Attachment 7 -6 -7 for more information on this subject. <br />
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