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The table indicates that the yield from the District's available sources provides little <br />excess supply beyond meeting current demands. Rehabilitating the Canterbury Tunnel <br />will allow the District to more reliable meet its overall demands. As well, the District's <br />water treatment plant in Evans Gulch was designed to be expanded by one mgd, which <br />may assist the District meeting future demands. <br />3.7. WATER QUALITY <br />Water produced by the District has generally been of good quality with respect to <br />hardness, clarity, and taste. Chlorination is generally kept to the minimum prescribed for <br />public systems and contaminants are undetectable or below the required levels. <br />Accordingly, the District has had no significant water quality violations over the past 30 <br />years. The few violations that have occurred were related to record-keeping <br />errors/omissions or departures from the required sampling schedule. <br />The one consistent source of problems in recent years has pertained to the Canterbury <br />Tunnel supply. The tunnel discharge was historically of excellent chemical, <br />bacteriological, and physical quality. In recent years a portion of the tunnel has <br />collapsed causing increased turbidity levels in the supply and a diminished flow rate. <br />The District is presently not using the supply due to its minimal flow rate and <br />unpredictable physical quality. <br />3.8. FIELD INVESTIGATIONS <br />Field investigations conducted to access the viability of the project have consisted of <br />inspections to access potential pipeline routes and identify the location of the Canterbury <br />Tunnel. Professional land surveyors have also conducted surveys to provide details on <br />the tunnel location and possible pipeline routes. <br />_1 W. W. Wheetsr and Assoctcec:, Ine. 5/19/2010 Final <br />— 1 Watar Rasources Engins¢rs Page 10 <br />