2016-12-23_PERMIT FILE - C1982056A (3)

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An 18 -inch corrugated metal pipe was installed at a 2 percent grade across the Connector Haulroad to control drainage. Culvert size criteria are included in Exhibit 8, Sediment Control Plan. The sub -grade was proof compacted and any deleterious or unsound material removed. Road fill material was hauled, spread, and compacted over the entire width of the road fill. as follows: 1) Where there was more than 5 feet of fill, the top 5 feet was compacted to 95percent of AASHTO T-180 and the remainder was compacted to 90 percent AASHTO T- 180; 2) Where there was a minimum of 3 feet of compacted road fill but less than 5 feet of fill, the entire fill was compacted to 95 percent of AASHTO T-180: and, 3) Where the road was in a cut, the roadway was over -excavated and a 3 -foot minimum thickness road till placed and compacted to 95 percent of AASHTO T-180. Moisture content and compaction were monitored during Construction. The Haulroad Connector was surfaced w ith `,ravel to form a durable road surface. A 12 -inch gravel base was spread and compacted to 95 percent of AASHTO "l_-180. 6 inches of gravel surfacing was spread and compacted to 95 percent of AASHTO T-180. The road is crowned to prevent ponding of water and surface dips have been used in conjunction with the ditches to control erosion where required. Certification for the Connector Haulroad is contained in Exhibit 25, As -Built Certifications of Access/Haulroad and Other Haulroads. 213. Haul Road B, Haul Road B Relocation (Haulroads B-1, B-2, and Driveway), and Stoker Coal Truck Turn -Around (TR08-65, MR16-301) Haulroad B was originally constructed and utilized by CYCC to link the mine haulroads in the Eckman Park surface mined area to the mine facilities area. It was subsequently used by TC to transport coal from the underground operations to the ROM coal stockpile and tipple. With installation of the overland conveyor belt, Haulroad B was no longer needed for normal coal haul operations, but was available for emergency coal haulage in the event that the overland conveyor was not operational. Because the overland conveyor alignment intersected Haulroad B, the road was split and partially rerouted to accommodate construction of the conveyor and subsequent construction of the coal preparation plant facilities. There are now two segments of Haulroad B, the western segment, Haulroad B-1, extends from the Tipple 2 road intersection due south of Pond C to the point where the old Haulroad B intersects the overland conveyor corridor (southwest of the current railroad crossing). the eastern segment, Haulroad B-2 extends from the current railroad crossing to its intersection with the Haulroad Connector (just west of the 0 -Entry shaft and fan building), as shown on Map 24, Surface Facilities. In 2016 a segment of Haulroad B-1 was widened to accommodate heavy equipment traffic between the BOB/Coal Loadollt Stockpile areas and the ROM Pile/Coal Refuse areas. Road widening was accomplished without any additional surfaee disturbance by placing a culvert in existing Ditch D-1 on the south side of the road and placing till from the existing safety berm over the culvert (berm was eliminated in this area as no longer required). In addition, a minor revision added a driveway south of Haul Road B-2 and west of the prep plant to accommodate stoker truck traffic at the prep plant. The driveway previously enabled trucks accessing the prep plant stoker stockpile to turn around atter entering the mine from the main entrance east of the office. To facilitate more efficient truck movements and loading, a portion of Haulroad B-2, adjacent to the Stoker Coal Truck Loading Facility, was widened about 15 feet to allow the trucks to load and complete a full -circle turn in the loading area. The driveway and modified haulroad Confi'Lluration are shown on Map 24A. Centerline profiles of Haulroads B-1, B-2, and Haulroad B Driveway, and typical haulroad cross-sections are shown on Map 30, Road Profiles and Cross -Sections. Grade and pitch requirements were not exceeded in road design, construction, or relocation. The original and relocated haul road is located out of any perennial or intermittent stream and any ephemeral stream with a drainage area over 1 square mile. The new Culvert D -1-E (approximately 350 ft. long), which was placed along the south side of Haulroad B-1 in order to widen a portion of the road, was sized based on ditch design flows and was slightly oversized at 30" to assure adequate flow capacity and facilitate cleanout. The culvert (E -2- B), under the original Haul Road B, has been relocated under the segment of the haulroad relocated during construction of Pond E. Due to minor changes in surface configuration during final site grading, the original culvert was replaced with two culverts. The additional culvert receives drainage from the segment of the prep plant area that previously flowed back to the original Culvert E-2-13. Consistent with the original design, the additional culvert is also a 15 -inch culvert, although the contributing drainage area is significantly reduced. The locations of culverts (E -2-D and E -2-E) are shown on [Flap 24, Surface Facilities. Culverts D -3-A and D -3-A(1) are located at the junction of Haulroads B-2 and C. at the railroad crossing, as shown on Map 24, Surface Facilities Map. These 48 -inch. 40 -foot long Culverts were originally designed and sized to pass the 100 -year peal: design flows for Foidel Creek (See Exhibit 8M) under the haulroads and railroad. Under a technical revision, these culverts were extended 80 feet on the east side and 20 feet on the west side of the railroad crossing. Appropriate approvals for the culvert extensions were also obtained from the U.S. Army Corps of Engineers under Nationwide Permit No. 3. MR16-301 205-68 07/08/16