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Minor Revision No. 23/ page 2 November 5, 1997 A concrete headwall which will allow flow from ditch D1-5 to flow into the new surface pipe (Cl-2A) has been installed. A concrete drop box is located at the outlet of the half-culvert, C1-4, to allow the flow from the half-culvert and C1-2A to flow into CI-2. Two concrete thrust blocks have been placed above and below the main access/haul road. A 72" CMP manhole has been installed for the main hauUaccess road crossing. Flow from Cl-3 (currently a surface ADS pipe) will also enter this manhole to flow into C 1-1. Four concrete foundations have been installed where the pipe makes two 90-degree turns and two 45-degree turns. There are also wood timbers that have been placed along the pipe alignment to support the pipe. The dimensions of the pipe, inlets, and foundations are included on the enclosed table. Map 54 has been revised to shown the new alignment of the pipes. Table 44 in Exhibit 66 has been revised to include the new pipe specifications. Underground Raw Water Line Replaced with Surface Pik For the same reasons as discussed above, the underground raw water line from the raw water intake gallery to FW-1, has been replaced with an 8-inch HDPE surface pipeline. Seven concrete foundations have been constructed where the water line makes three 45-degree turns and four 90-degree turns. Concrete and wood blocks have also been installed to support the pipe. The dimensions of the pipe and foundations are included on the enclosed table. Piezometer Installation To monitor the groundwater that MCC believes is contributing to the increased slope movement in the facilities area, six piezometers were installed. They are identified as PP-l, PP-2, PP-3, PP-4, PP-7, and PP-9, and are shown on the enclosed map. The piezometers were completed as pneumatic piezometers, which are entirely grouted from the bottom of the hole to just below the surface, as shown in the enclosed drawing. Water is then measured using a probe that has already been installed in the piezometer. Because these piezometers have been grouted to the surface, the only reclamation that will be needed is to remove the pneumatic tubing and the junction box at the surface, cut the surface casing just below the ground surface and then backfill. Inclinometer Installation To monitor slope stability movement, four inclinometers were installed. They are identified as I-5, I-6, I-7, and I-8, and are shown on the enclosed map. The inclinometers are 4-inch cased holes and will be reclaimed in accordance with Rule 4.07.3, depending on whether water is present in the hole. The depth of each hole is provided on the enclosed table.