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Ken Nelson <br />December 20, 2011 <br />Page 14 <br />linprovements to Onen Ditches: <br />• Regrade ditch flowline to provide continuous slope <br />• Install 60-inch ADS pipe with nominal backi'll to bury new pipe <br />• Consider 54" HDPE DR32,5 as acceptable alternative between inverted siphon and <br />tLI1111CI for contiguous COnStrUCtiOn materials <br />• Concrete encase pipe at drivcway/road crossings <br />Provide new headgate connections to replace existing services <br />• Reconstruct maintenance road <br />• Provide for cross drainage troth major Upgr,'WiCnt point sources <br />0 Reconstruct overflow structure near Marshall Road <br />Future Open Ditch Improvements. <br />In the event installation ol'60-incli ADS pipe in open ditches of the capital improvement <br />plan effectively reduce salinity or selenium levels, and/or if smaller diameter tunnel finer <br />conduit is selected and noticeable capacity degradation is observed over time, consider <br />future extension of the piped ditch improvements in (lie approximate 3 -rile reach between <br />the Trap Club and the inverted siphon outlet <br />We believe this infoll1lation can be used as the basis for financial platuring purposes. Feel free to <br />contact our office if additional detail is needed, or if You have any questions or comments on the <br />alternative development and assessment. We would be happy to provide cost estimates of any <br />component of the capital iinprovenients plan to supplement costs previously received, or to develop <br />a set of design-build Plans and Specifications for implementing the capital improvements plan. <br />Respectfully, <br />C. Kellie Knowles, P.E. <br />Attachments <br />cc: Dennis Lambert—P.E., Lambert & Associates <br />Tim Malone, Beavers Construction <br />