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Chani!e Order No.2 and No.3 - Retainini! Wall. RiTJ RaTJ. and Preble's Habitat Upon relocation of the sanitary sewer line it was determined that an H-pi1e/concrete retaining wall, 110-feet in length would need to be constructed. The construction of the retaining wall was necessary given the steep unstable condition of the adjacent slope next to the east spillway wall excavation. Additionally, construction of the retaining was would allow the sanitary sewer line to be adequately backfilled and protected. Additional cost = $150.100 +$33,939 = $184,039 During further examination of spillway chute in the field it was determined by the engineer that the foundation and other resistance properties were more favorable then anticipated. Therefore, the rip rap thickness downstream of the spillway chute and the grouted rip rap thickness within the spillway chute itself could be reduced from 3-feet to 2-feet and the average size of rock be reduced from 18-inches to 12-inches. Reduction in cost = $13,770 + $13,775 = ($27,545) In November of 2000, the U.S. Army Corps of Engineers, Albuquerque District (pueblo Office), authorized the construction of a new spillway for the dam under Nationwide Permit No.3. The filling of the reservoir along the west shore, embankment rehabilitation, outlet works rehabilitation, and construction of a pedestrian trail did not fall under the guidelines of a Nationwide Permit and required the issuance of a separate Section 404 Individual Permit. The issuance of a Individual Permit required that the proposed construction area be field surveyed to see if any threatened or endangered species habitat were being adversely affected. Upon evaluation of the proposed construction area by Smith Environmental, it was determined that the project site contained suitable but unoccupied habitat for the Preble's Meadow Jumping Mouse, and that necessary mitigation measure be incorporated into the project to offset the affects of the construction, The Section 404 Individual Permit for the project was iss~d on February II, 2002, by the Army Corps of Engineers. The 404 Permit issued required that the Town of Monument offset the impacts to the existing Preble's habitat through the mitigation of 4.67 acres within the project area. Additionally, as part of the created habitat component of mitigation, a 60-foot wide travel corridor was required to be constructed, incorporating high quality Preble's habitat components. To facilitate some potential movement of Prebles along the Monument Creek waterway during the 2002 growth season, the Town of Monument was also required to plant Zone 4b, with a shrub/grass mix prior to May 15, 2002. Additional cost = $160,915 Chani!e Order No.4 - Dredi!ini! The Town of Monument elected to modify the original bid quantity of dredging from 50,000 cubic yards to 75,000 cubic. Additional cost = $147,500 3