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. o in 1983 Exxon constructed a major element of the Colony river water <br />supply system, the river intake structure. The 13,000 GPM water in- <br />take structure, located in the Colorado River about 120' offshore at <br />Exxon's river water intake site, was constructed in accordance with <br />Exxon's 404 Permit issued by the Army Corps of Engineers. Staging the <br />construction schedule to avoid conflicts between the now completed off- <br />shore work and the proposed future onshore work is intended to enhance <br />the overall economics as well as environmental protection during con- <br />struction. (see Exhibit D-3) <br />o In late 1983 and early 1984 the Middle Fork Dam Access Road was complet- <br />ed. This road provides permanent access from Davis Gulch to the Middle <br />Fork Dam for construction, dam monitoring and maintenance for the life <br />• of the dam. (see Exhibit D-4). <br />o During 1983 and 1984, major design and construction activities were <br />carried out in conjunction with the Middle Fork Dam project. In 1982, <br />Exxon performed feasibility studies which indicated that a gravity dam <br />based on a roller compacted concrete (RCC) design could result in sig- <br />nificant economic and performance advantages over the zoned earth and <br />rockfill dam on which construction had begun prior to May 1982. Because <br />RCC is relatively new technology, Exxon commissioned a consulting firm <br />in early 1983 to perform preliminary design studies to verify this find- <br />ing. Later in 1983 that firm was authorized to carry out final design <br />work culminating in drawings and specifications suitable for bid. The <br />main construction contract was let in May 1984, and construction is <br />• scheduled for completion in late fall 1984. (see Exhibit D-s) <br />D-3 <br />