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Last Chance Ditch Company <br />flow and allo�v for future upgrades do��nstream. Costs for this option were <br />estimated at $68,000. <br />3. Replace the existing structure with a similar headgate and flumegate. <br />This alternative is similar to option number tcvo yet it includes an automated <br />flumegate that would adjust to control the flo�v in the ditch based on the flows <br />in the St. Vrain Creek. Additional cost of the flumegate presents an estimated <br />total cost of $80,500. <br />4. Replace the existing structure with headgates and an optional <br />overshot gate for river return flows. <br />This alternative provides a similar structure �vith two headgates to allo�v for <br />regular ditch flows. Included is the option for an overshot gate to allo�v for <br />water to be released back to the river. In times of low flo�v the water would be <br />able to be backed up and allow for more ��ater to be taken during periods of <br />low flow in the river. The overshot gate is a more expensive option and the <br />$36,100 gate could be added at a later date. The infrastructure would be <br />installed during the headworks replacement to allow for the future addition of <br />the overshot gate. This alternative has an estimated cost of $81,400 without <br />the overshot gate and approximately $117,500 with the overshot gate installed. <br />5. Replace the existing dam and upgrade the structure with options #2 or <br />#3. <br />The alternative of replacing and upgrading the existing dam �vas also evaluated <br />on a preliminary basis. This included estimates for costs for evaluating flood <br />studies and permitting cvith geotechnical analysis for the dam. This additional <br />item was estimated at $99,000 thus creating total costs of $167,000 and <br />$179,500 for including options two and three respectively. <br />Last Chance Ditch Company - Cost Estimate <br />Alternatives: A rox. Total Cost: <br />1 Take no action 0 <br />2 Similar head�ate $68,000 <br />3 Similar head ate 8v flume ate $80,500 <br />4 Similar headgates with overshot gate structure +$81,400 <br />Install overshot gate at later date +$36,100 <br />Similar headgates 8s optional overshot gate 117,500 <br />5 Replace eYisting dam 8s upgrade with alternative #2 $16?,000 <br />Replace e�sting dam & upgrade with alternative #3 $179,500 <br />i i ast ance itc ompany oan easi i ity tu y age o <br />