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<br />proceeds. In order to adequately handle pit water accumulations, SCC will pump pit <br />• water to the new sedimentation pond and discharge it through the CPDES discharge <br />point on an as-needed basis. Anticipated pumping volumes have been considered in <br />design of the new pond and pond discharge structures are designed to provide for <br />adequate detention time to allow suspended solids to settle out while minimizing overall <br />storage volume. <br />Roads. The site can be accessed from either the north or south. The north access, used <br />for the original operations and much of the Phase I expansion operations, enters the site <br />from RCR 516 and has been progressively extended with successive pits as gravel <br />excavation has progressed to the west. The south access, which was constructed to <br />address haulage traffic concerns on RCR 51 B and is now the primary access, enters the <br />site from SCC's Tie-Across Haul Road and will be extended as mining progresses in the <br />Phase II expansion area. <br />Signs and Markers. SCC will maintain a sign at the main access point to the Mesa Gravel <br />Pit identifying SCC as the operator, providing the permit number, and indicating that a <br />permit for the operations has been issued by the CMLRB. Boundary markers for the <br />affected area will also be established and maintained. <br />TOPSOIL REMOVAL <br />The first phase of gravel pit operations is the removal of all suitable topsoil material. The <br />topsoil is removed by scrapers or other suitable equipment. SCC recovers a minimum of <br />2 feet of topsoil from all disturbance areas and attempts, in all cases, to recover the <br />maximum amount which is operationally feasible. The topsoil is either placed in <br />designated topsoil stockpiles (Exhibit D-1) or replaced directly on regraded overburden. <br />One or two additional topsoil stockpiles will be needed. These stockpiles will either be <br />placed in the area ahead of mining or in an area that has been mined and backfilled but <br />not revegetated and will be located and constructed to minimize loss or contamination of <br />topsoil materials. Any topsoil stockpile areas which will not be disturbed for periods <br />greater than six months are seeded with aquick-growing cover crop to protect from <br />erosion. Once stockpiled, the topsoil is rehandled as little as possible until replacement <br />• on the regraded area. <br />D3 Revised May 1998 <br />