01/26/1998 Council Packet - Laserfiche WebLink

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AGENDA ITEM 6D STAFF ORIGI ATOR: David Ahrens, City Engineer l 'ublic Works Director DATE: January 26, 1998 TOPIC: Resolution No. 98 -10, Order Improvement and Preparation of Plans and Specifications, Blackduck Drive lift Station C City staff is..rer#x to construe a n identt in of $350,000. Ti built in 1970 lac Lane, In 1994, station only to r+ acting Council, authorization to prepare plans and specifications a lift station serving the Blackduck Drive area. This project is apical Improvement Pistil for year 2000 at an estimated amount pro new lift station will replace the existing lift station Ged on the west side Blackduc k Drive and just south of Lantern City prepay l plans and specifications to construct .a new lift ect alt of the submitted bids due to the high amounts. iss F The a #irk lit station isists of a we well to store the waste water connected to a separate d welt that' houses the pump and fittings. This design requires maintenance personnel to enter the dry well to work on the pumps. Work in this confined epee requite special, safety precautions to meet OSHA rules. The waste water flow volumes that enter the existing Blackduc k Drive lift station have exceeded its capacity and in order to keep up with the higher flow volumes, the pump cycles at an extremely high rate (15 times per hour) with the pump on for a very short time (30 seconds). This high cycle frequency contributes toward excessive wear on the pumps. Recomrr riled cycle times for a lid station are 6 cycles per hour. The stroll volume not only contributes to a high cycle frequency but also reduces the storage volume and time tco Poi to pump failures prior to the flow backing up into a baa anent. A sed ties ' tt prop �rsible ns Pis pub car right o service as the ne if oni unsightly p house underground except fc This prat is sirrrprr project des" in 19 station will coincide wi area. Staff feels that as a new lift station consisting of a wet well and side of Blackduck Drive within the unimproved y. This will allow the existing lift station to remain in nstructed. The new design will also eliminate the of the components of the new lift station Mil be �trol panel. is expected to be less expensive than the previous The tithing of the construction of the proposed lift 3 reconstruction of the streets in the Blackduck Drive Meting the lilt station work at the same time as the