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trench during construction. A long -reach or rotary excavator is generally used to dig the <br />trench into a non - pervious bedrock layer that under lay's the permeable, excavated <br />overburden. Once the trench is excavated and while maintaining the bentonite slurry, the <br />trench is back filled with an impervious mixture of blended overburden and bentonite; <br />overburden, cement and bentonite; or cement and bentonite. The backfilled trench is <br />then covered with a cap to protect the backfilled trench from deterioration. Typically, <br />over this and the surrounding area, down to the toe of the reservoir basin will be placed <br />a course gravel layer to protect the surface area from erosion and inhibit the growth of <br />vegetation. (Appendix IV contains the Design Report for Phase One Reservoir prepared <br />for the Office of the State Engineer (SEO).) <br />The Applicant/Operator will provide detailed designs in the form of a Technical <br />Revision at a future date once other key permits and approvals are obtained from other <br />agencies. No slurry wall construction will begin until the Technical Revision is approved. <br />Conceptual slurry wall designs and specification, and a commitment to a QA/QC acceptable to <br />the Division are provided in Exhibit "E ". <br />• Relocation of the Excelsior Ditch: <br />The Excelsior Irrigation Ditch is a functioning structure that crosses portions of the <br />proposed operation. Portions of the ditch will be relocated to the north edge of the <br />permit boundary, adjacent to State Highway 96 East ROW (US 50). The relocated <br />Ditch will be constructed using typical earth moving equipment suitable for the job such <br />as bucket excavators, dozers, scrapers and motor - graders. The cross - sections and <br />designs for the proposed Excelsior Ditch relocation will be engineered to carry the <br />