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. _ -7- 5• Calculations demonstrating that the stream crossing will safely pass the 20-year-24-hour event must be submitted. 4.03.1(4)(e). 6. The applicant needs to demonstrate that culverts are designed, constructed and maintained to sustain the vertical soil pressure, the passive resistance to the foundation, and the weight of the vehicles to be used. 4.03.1(4)(e). PONDS. IMPOUNDMENTS AND DIVERSIONS 1. It appears from information submitted by the applicant that sedi- ment pond 004 is located off the proposed permit area. The pond must be located within tl~e permit area. 2. The proposed sediment pond designs do not include a non-clogging dewatering device. Ponds are required to have an automatic non- clogging dewatering device. 4.05.6(3)(c). 3. The applicant should discuss the need for anti-seep collars and cutoff trenches during construction of the ponds. 4.05.6(8)(c). 4. The applicant should supply elevations of outflow structures, sediment levels, and embankment heights for all new ponds. 4.05.6(4). 5. The applicant is proposing to design the ponds for a six-month sediment retention rather than three years. This can.be approved by the Division providing the following information is provided. (a) The applicant must demonstrate that the ponds are capable of holding the sediment volume generated dur- ing a 10-year event in addition to the six-month storage volume. (h) Tiie applicant should submit a detailed sediment level monitoring plan. 6. The applicant should submit calculations used to determine sediment pond detention time. Detention time should be calculated with a non-clogging dewatering device installed. 4.05.6(3)(a) and 4.05.6(4). 7. Tlie applicant should submit design criteria and supporting calcu- lations for the proposed pit water treatmenC structures. It should be demonstrated that they will be sized to hold anticipated inflows and be able to meet effluent limitations upon discharge. 4.05.2(1). 8. The applicant should submit new, amended NPDES permits or the appli- cations for all new discharge points. 4.05.2(7).