Laserfiche WebLink
<br />Mr. Marcus Middleton - 3 - January 24, 1991 <br />7. Small area exemptions numbered 9 and 10 must include a demonstration <br />~hich satisfies either 4.05.2(2) or 4.05.2(3). The existing information <br />/ is not adequate. <br />8.,/ Include a small area exemption for the area which drains to culverts <br />numbered 2 and 3. <br />Ditches <br />Q <br />1. N~ previously mentioned, all ditches must be labeled and specifications <br />must be provided for each. <br />2. JProvide specifications for the upland diversion ditch at Mine 3 North. <br />(Nate: This is not necessary if the M3N pond sizing does not rely on the <br />ditch to divert flow.) <br />3. ~IIA11dd the Homestead Ditch specifications and text previously approved. <br />4. The approved plan for Ditch H-3 requires riprap. This is based on a <br />~' projected flow velocity of 6.2 f.p.s. Field observations also <br />substantiate this requirement. The revised page 3-26 eliminates this <br />requirement. Replace the requirement and install the riprap, or justify <br />the elimination of the requirement. <br />Culverts <br />1. JTo which culvert does page 3-28 (Sediment Pond M3N culvert) refer? <br />2. `The culvert sizing table seems to contain errors regarding contributing <br />area for culverts la, lb and 2. Please check the drainage area and <br />correct as needed. Recall that drainage from the county road enters <br />these culverts. <br />Permanent Ponds <br />7. / Please add the January 29, 1987 adequacy response (TR-3) as an exhibit <br />page. <br />Stock Ponds <br />1. As previously mentioned, specify whether the stock pond, the associated <br />24" CMP, and Ditch f-2 are premining structures. If not, specifications <br />must be provided. <br />Pond Certification <br />1. Please number the pond certification pages. <br />