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Introduction <br />There are two ponds associated with the Truck Wash Facility: the ^Clean Water <br />Supply Pond" and the "Wash Pond". The ponds are located in the NW/4 and NE/4, <br />Section 34, Township 6 North, Range 87W (see Exhibit 7-16A, Truck Wash <br />Facilities Layout). <br />These two ponds were designed and constructed to contain water associated with <br />equipment washing. These structures are not sedimentation structures designed <br />and constructed to detain runoff from a design storm event (e.g., 10-year, 24- <br />hour precipitation event), consequently, they do not need to meet the <br />requirements of Rule 4.05.6. The ponds are operated as follows: <br />• The Clean water Supply Pond receives water from Pond 002 via a two-inch <br />PVC pipe, Excess water drains to the Shop Diversion Ditch via an 18-inch <br /> CMP straight pipe spillway. <br /> • Water is pumped from the Clean Water Supply Pond to the wash bay on <br /> demand. <br /> • Dirty water flows directly from the wash bay to the Wash Pond. The Wash <br /> Pond is cleaned of sediment as needed. Excavated sediment is land farmed <br /> at the Petroleum Contaminated Material Stockpile. Water contained in the <br /> Wash Pond drains to the Shop Diversion Ditch through an 18-inch T-shaped <br /> spillway device (see Exhibit 7-16B, Truck Wash Facilities As-Built). The <br /> T-shaped device is oriented so that the barrel of the "T" is the spillway <br /> pipe and top is a decant - water flows in through the bottom of the ^T" <br /> and then through the barrel pipe. When the water level is at or below <br /> the invert elevation of the barrel pipe the pond does not discharge. <br />The structures are incised impoundments lined with MSHA safety berms. They are <br />temporary structures and will be reclaimed in conjunction with the shop area. <br />Design Analysis <br />Seneca Coal Company prepared a pond design in 1984. The design is presented on <br />Exhibit 7-16A. <br />The water surface elevation in the Clean Water Supply Pond is variable and <br />depends on wash water demand. The water is gravity feed to the pond from Pond <br />002 via a 2-inch PVC pipe. An 18-inch CMP straight pipe is the principal <br />spillway. Because the pond was not designed or constructed as a sedimentation <br />. structure, it does not need to meet the Rules 4.05.6, 4.05,9(2)(a)(i) or <br />4.05.9 (2)(c)(ii). <br />TR-37 1 Revised 04/05 <br />