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APPCOR12906
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APPCOR12906
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Last modified
8/24/2016 6:33:15 PM
Creation date
11/19/2007 2:35:50 PM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1980003
IBM Index Class Name
Application Correspondence
Doc Date
11/23/1981
Doc Name
PROPOSED DECISION AND FINDING OF COMPLIANCE & Letter
Media Type
D
Archive
No
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-11- <br />V. Hydrologic Balance (con't) <br />Because the assumptions used were not conservative for calculating runoff <br />volumes and sediment yield for the capacity of pond HG-8, it was at first <br />believed that the pond may be undersized. In light of further information <br />supplied by the applicant and additional analyses by the Division staff it <br />has been determined that the pond design is in compliance with the Rules <br />and Regulations. Pond HG-8 was originally designed to contain three years <br />of sediment accumulation in addition to the runoff from the 10-year 24-hour <br />storm. Using more conservative parameters for crop cover and sediment density <br />and giving consideration to the surface manipulation which is employed by <br />the operator, it is evident that the design allows for the storage of at <br />least one years sediment accumulation plus the runoff from the 10-year <br />24-hour storm. This satisfies the requirements of Rule 4.05.6(3)(b). <br />To determine any need for sediment removal H-G Coal Company has agreed to <br />monitor the level of sediment in all ponds. Sediment levels in the ponds <br />will be surveyed during mid to late summer every year and a report will be <br />prepared and certified by a registered professional engineer. If the <br />sediment level is at 60% of maximum volume it will be cleaned. <br />The remaining ponds for the shop area, sanitary facilities, explosive <br />storage and tipple areas do not have devices for dewatering to the maximum <br />sediment storage level. Topographic restrictions prevent the placement of <br />a functional detaatering device in all ponds but the one at the shop area. <br />Principal and emergency spillways are appropriately sized and all ponds <br />are designed to contain a maximum sediment volume in addition to the volume <br />of runoff from the 10-year 24-hour storm event. Aj_ ~Q~ 0 <br />w 7 <br />H-G Coal Company has agreed to pump any water stored in the ponds at the <br />sanitary landfill and explosive storage area within 24 to 36 hours of a <br />storm event. Additionally, information has been supplied showing that <br />water levels in ponds at the shop area and tipple can be maintained to <br />allow further storage of the 10-year 24-hour event. This information is <br />located in Appendix E (Volume III) of the application. <br />Culvert number 8 was originally undersized as presented in the application. <br />The culvert would not pass the required flow without exceeding the avaible <br />head at the inlet end. H-G Coal Company has committed to installing an <br />additional 30" culvert next to the existing one. The combination of the <br />two side-by-side culverts will pass the required flow within all physical <br />restrictions. Information about the capacity of this installation is <br />given in Appendix E (Volume III) of the application. <br />H-G Coal Company has requested a small area exemption from the requirement <br />to construct sediment ponds to contain runoff from two topsoil stockpiles. <br />One stockpile has an area of approximately 5 acres and the other is 3 acres <br />in extent. These stockpiles do not constitute a continuous disturbance <br />and they are essentially in two separate drainage areas. For these reasons <br />the Division has decided to grant a small area exemption for stockpiles B <br />and C pursuant to Rule 4.05.2(3)(b)(i). <br />The operation is in compliance with the requirements of this section. <br />
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