Laserfiche WebLink
<br />Technical Information Requested - Stormwater Manageme:it Plan <br />(T.H.E. Aggregate Source - Permit No. M-77-193) <br />1. Stormwater runoff calculations for peak flow and volume of both <br />the l0 year - 24 hour storm and 100 year - 24 hour storm events for <br />both the disturbed area watershed and the upland non-disturbed <br />watershed (6 hour storm events may be substituted as aF~propriate). <br />2. Average annual sediment loss from the disturbed area. <br />3. Engineering designs including longitudinal profiles, cross <br />sections, and plan views of all channels, ponds, culverts, <br />spillways, or other hydraulic structures, as necessary. <br />4. Engineering design(s) and construction techniques of any <br />alternative sediment and/or erosion control structures other than <br />those specified in item 3 above. <br />5. A list of all property owners that may be affected by the <br />proposed Stormwater management plan and their necessary approvals. <br />6. A commitment to design and build all proposed Stormwater <br />controls such as channels, ponds, and spillways in such a way as to <br />minimize impacts to the hydrologic balance within the quarry as <br />well as the surrounding area. <br />7. A commitment to have all proposed structures installed and <br />functioning properly no later than October 31, 1996. <br />8. Contingency plans for a discharge of excessive storms/ater flows <br />offsite onto Tunnel Drive. (ie, a 100 year storm event or greater) <br />9. A commitment to have the construction of all proposed structures <br />certified by a registered professional engineer. <br />10. A schematic which shows the flow path of all runoff water from <br />the upper reaches of the disturbed area, alone the .zaul road, <br />through the various containment ponds, to the lower reaches of the <br />disturbed area. <br />11. A discussion of which structures will be left in place during <br />final reclamation, which structures will be removed, estimated <br />construction costs of any temporary structures, and any plans for <br />stream channel reconstruction during final reclamation. <br />12. A commitment to cease and desist from any disturba.~ce in the <br />amendment area until the operator has received Division approval of <br />an acceptable plan for minimizing impacts to the hydrologic balance <br />in the quarry and surrounding area during management of Stormwater <br />runoff and has submitted certifications from a registered <br />professional engineer that all designed structures have been <br />constructed and are functioning properly. <br />M: \oss\Te~a}:.964 <br />