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Mr. Clapper and Mr. Romig <br /> September 24; 1996 <br /> Page 8 <br /> level that will then control the starting and stopping of the pumps. The existing Warrick <br /> level meter can be re-used. However, longer contact probes will be required as the <br /> operating range of the pond would be greater than the historic operating range of the wet <br /> well. <br /> Currently, there is an automatic valve that is opened to drain the discharge pipeline <br /> when the pumps turn off. This existing pipeline drain system can remain unchanged for <br /> the modified system. However, due to the elevation of the existing drain pipe, it is not <br /> possible to completely drain the discharge pipeline with the current arrangement. The first <br /> 50 feet of the pipeline will remain undrained. We do not know whether freezing of this <br /> portion of the pipeline has been a problem in the past. If it has, then an alternate <br /> arrangement should be considered, or heat tracing that length of pipe. On Drawing 134-2- <br /> 01 we have specified that the discharge pipeline be installed at a flat slope until 5 feet of <br /> cover can be maintained. The pipeline would be buried at this depth until the pipeline <br /> invert elevation Is greater than 10,586. This will minimize the risk of freezing without <br /> having to modify the drain piping. With the modified piping arrangement,the time between <br /> pump starts during the low flow winter period will be longer than it has been in the past. <br /> An additional item to consider is that the pipeline route through the Dam 4 <br /> embankment and emergency spillway will require review and approval by the State <br /> Engineer's Office (SEO) before this section of the pipeline can be constructed. Mark <br /> Haynes at the SEO has informed me that It may be possible to expedite the review process <br /> by having a third party geotechnical engineering firm (such as Titan or Kumar) review the <br /> design and submit a design review memo to the SEO. Construction of the pipeline not <br /> located within the embankment or spillway could be completed while the review process <br /> is in progress. <br /> 60' d Z00' cN Sb: TT 96 bZ daS 30SSd �8 Jaiaaum - m- m <br />