2018-01-23_PERMIT FILE - C1981041 (8)

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CAMEO REFUSE DISPOSAL AREA No. 1 (CRDA 1) Drainage for the CRDA 1 consists primarily of collection ditches leading up the side of the pile. Due to the small area, approximately 2.8 acres, a diversion above the pile was not installed prior to construction. Exhibit 9B shows the details of drainage around this pile and Appendix 13 -2 has the 100 year, 24 hour precipitation event design for the SE collection ditch and the NW collection ditch. These collection ditches direct runoff into Pond 6. Drainage from above the pile is diverted around the pile. The SE collection ditch design included a culvert where Haul Road 5 led onto the pile. This culvert was removed and replaced with a rip rap ditch during the final reclamation of the pile in 2010. Two culverts formerly draining across this access road have been eliminated by Public Service Company as part of MR -12. In cooperation with Public Service's letter in Appendix 13 -7, drainage design and maintenance on the south side of Haul Road 5 will be left up to Public Service as part of their ash dump drainage. Areas of alternate sediment control are listed in Table 13 -5 and include straw bale and dirt berm dikes placed around reclaimed topsoil stockpiles 5 and 6. These stockpile areas were regraded and seeded in 1994. As of May 2001 the vegetation on these two areas are adequate to control erosion, see appendix 14- 6. NORTH DECLINE The North Decline West diversion ditch #1 and East diversion ditches #1 and #2 will remain as permanent features and continue to divert unaffected runoff around the reclaimed area. Additionally, the 12" V ditches flowing to the permanent channel, the berm along the east perimeter and the 12" CMP shall remain as permanent features as depicted on Exhibit 12C. Berm breaks will be installed along the permanent channel to allow reclaimed area drainage to enter the channel. The intermittent stream channel was reestablished as a wide rip - rapped channel. Pond 7 was enlarged to accommodate more of the reclaimed area drainage east of the channel. Shallow depressions, the East and West Sumps, were excavated for alternate drainage control east and west TR -62 13 -10i Rev 10/11