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<br />As noted on the design drawings of the Scullion Gulch bypass system, erosion protection is <br />provided at the inlets and outlets, as appropriate. Concrete hardwalls are provided at all inlets, <br />while inlet and outlet channels and banks are riprapped. Debris-control structures are provided at <br />all inlets to prevent clogging. <br />It was assumed that the flow in all lateral culverts entering the main Scullion Gulch bypass culvert <br />would be controlled at the inlet. This assumption was based on the steep slope of all lateral <br />culverts. As a result, the culvert design Homographs of Hydraulic Engineer Circular No. 5 of the <br />Federal Highway Administration were used to determine proper sizing of all laterals. In each case, <br />an allowable headwater depth of 1.2D was assumed (where D is the diameter of the culvert). <br />The streams are not perennial and do not support an aquatic community. Therefore, the <br />requirements of Section 4.05.18 do not apply. <br />V.D Stoage and Disposal of Acid-Forming, Toxic-Forming and Combustible Materials <br />The mine development and coal processing wastes do not have properties that classify them as <br />acid forming or toxic forming (see Table V-1). The percentage of combustible material in the waste <br />is small. The waste material is placed and compacted to reduce the possibility of spontaneous <br />combustion (see Section IV.D.3). <br />• If large amounts of combustible materials are delivered to the disposal area, special measures such <br />as windrowing the material and mixing it with noncombustible material will be taken to avoid having <br />large pockets of the combustible material within the waste bank. <br />Gasoline, diesel fuel, and bulk oil are stored in tanks placed in properly sized secondary <br />containment structure designed to contain precipitation plus the contents of the largest tank (Map <br />15). <br />No more than 1,000 pounds of explosives are expected to be stored in the explosive storage <br />magazine. In accordance with the American Table of Distances for Storage of Explosives, the <br />magazines are located approximately 650 feet from buildings or work areas and are located behind <br />a natural (rock) barrier wall. Primers and explosives are stored in separate structures. These <br />structures comply with the National Fire Code (NFC) requirements for Type 1 magazines. Storage <br />and handling are in accordance with NFC and other applicable regulations. <br />Toxic-forming, acid-forming, and combustible wastes (such as fuel oil, grease buckets, old tires, <br />etc.) are collected and stored in suitable containers in accordance with NFC and other applicable <br />regulations. A contractor collects this material on a regular basis and is responsible for its proper <br />disposal. <br />• <br />Mid-Term Review 2002 (8/2002) V-16 <br />