Laserfiche WebLink
demand in summer when senior water rights are of critical importance and during winter <br />when Parkville's surface water supply is minimal. <br />The source is also valuable with respect to its chemical and physical properties. Prior to <br />the tunnel deterioration issues the water contained around 100 ppm hardness and 0.1 <br />ppm iron, completely satisfactory for municipal use. In terms of physical properties, the <br />water has consistently been measured at 50 degrees Fahrenheit. The temperature of <br />the water is important during the winter because this warm water effectively raises the <br />temperature throughout the system to prevent freeze-ups in the distribution network. <br />Problems created without the supply have been significant in the winter of 2009 through <br />2010. During this period over 200 service taps and at least five service mains have <br />frozen. Over 100 customers are currently running water on a constant basis to prevent a <br />frozen tap, putting the District at risk of failing to meet its water supply demands. If <br />repairs are not implemented, it is expected that the District will experience similar or <br />more severe problems in the future. <br />4.4. PROJECT OBJECTIVE <br />The objective of this project is to construct a facility that will provide a reliable year-round <br />supply of good quality, warm temperature water to restore the District's water supply and <br />minimize freezing problems throughout the District's distribution system. A No-Action <br />alternative and two alternatives were considered to meet the project objectives. The <br />alternatives are listed below, followed by a brief description and comparison of the <br />alternatives. The alternatives are: <br />1) No Action Alternative <br />2) Alternative No. 1- Drill a shaft into a stable portion of the tunnel, set a pump <br />in the base of the tunnel, and deliver the water via a 12-inch-diameter <br />pipeline to facilities in Evans Gulch where it can be temporarily stored or <br />treated at the District's water treatment plant. <br />3) Alternative No. 2— Drill a shaft into a stable portion of the tunnel, set a pump <br />in the base of the tunnel, deliver the water to the existing Canterbury wet well <br />via a 12-inch-diameter pipeline, treat the supply, and pump it to the northern <br />portion the District's distribution system. <br />__J W. Ul. Wheelsr ond Associoe�s, Ine 5/19/2010 Final <br />—'� Wotar eesources Engln�srs Page 13 <br />