Agenda - 11-19-1985 - Laserfiche WebLink

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1 . , . . . . , , . - . , 8 govern customer water use during periods of extended shortage. E. Add flashboards to raise the normal lake level at estimated cost of $ . 1 I. e r-1 Johnson • of Hillsborough 1 • • A. Raise the present lake level by 2 feet installing flasbboards. Estimated construction cost $ • This would increase the dependable supply by 220,000 gallons per day. . 1 B. Move aCgUMUlatO sediments upstream of the,bypass • e:lej.se_gate. This work would assure proper opera- tion of the sluice gate and allow for normal opera- . tion of Lake Ben Johnson at less than full pool elevations. By so doing, the available safe yield of Lake Ben Johnson could be increased since runoff . during rainfall events could be stored behind the dam as opposed to flowing over the dam. The Town of Hillsborough is thought to have the necessary equipment to perform this work. Assuming this is to be the case, this item of work has no significant cost and should be undertaken as part of the routine maintenance of the structure. C. EaPP____the motor levekiLl_l_tgLIMP_egisting vertical . mixed flow pumps. The existing pumps are subject to periodic flooding of the motors. Raising the motors above their present level would increase the reliability of operation. Based upon discussions with the manufacturer of the existing pumps, it does not appear that this objective can be -conveniently accomplished without raising the entire pump includ- ing impellers. This solution is not considered acceptable since it would decrease utilization of the present pool volume. Two new pumps with longer , shafts could be purchased and installed at an estimated cost of approximately $30,000. It might , ',- be possible to save $2-3,000 by reusing the existing . motors. D. msig.Alasxiating____TrIgtor—contre, centers. This item is related to raising of the pumps and is intended to increase the level of flood protection afforded the electrical equipment. This could be accomplished by a masonry block platform with a - . concrete slab top to meet Electrical Code require- 1 • ments for front access to the enclosures. Wiring from the MCC to the motors should be replaced to avoid a splice that could not be, properly water- ,- proofed. The estimated cost of this work is $7,000. - . B. PTOYiaieD_PLAtAe.a.7,14(-14agn."- tO oRgrate one of_the Law_watpc_pumpa_iinring e 5 & Qqr outages. A small diesel electric generator set with a capacity of approximately 60 Kw would be required. The estimated cost of this equipment would be $20,000. t ,k F. Ii VlaisgLibirsl___Laid_AcIter pump. The piping configuration already provides for the addition of a iil: .