CCP 10-13-1998 - Laserfiche WebLink

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. CITY OF ARDEN HILLS MEMORANDUM DATE: October 7,1998 TO: Brian Fritsinger, City Administrator FROM: Dwayne Stafford, Public Works Director Y\ SUBJECT: Lift Station #3 Conversion Background The City of Arden Hills currently has 14 sanitary sewer lift stations. Five of those stations were installed in the early 1960's and are of the type where pumps, valves, and the control panels are mounted inside a 10 foot diameter by 10 foot high steel cylinder which sits up to 30 feet below the surface. Access to the station is provided by a 3 foot steel tube rising from the top of the station to 2 feet above the surface. Entering the station requires Confined Space Training and a Confined Space Entry Permit. Any entry also requires a stand-by person to remain on the surface in case a problem develops, such as the entering person being overcome by fumes. . Lift Station #3 Conversion Lift Station #3 is located on Lake Johanna Boulevard just west of Siems Court and is one of the five stations described above. Public Works has budgeted $60,000 to convert this station to an up-to-date type in 1998. Staff had also included $60,000 in the crp budget every other year from 1998 on, to convert the remaining four stations to up-to-date types. The converted lift stations will be of the submersible type. This type of station features a 6 foot to 10 foot diameter concrete manhole with a 3 foot by 4 foot access hatch at ground level. Submersible pumps are mounted in the manhole on tracks, which allow the pumps to be hoisted to the surface for maintenance and repair. Control panels are also at the surface, mounted in a cabinet, eliminating the need for dehumidifiers, sump pumps and most confined space entries. The City Engineer (BRW) has evaluated the existing Lift Station #3 and agrees with Public Works on the need to maintain a program of bringing the City's oldest lift stations up-to-date. The City Engineer has drafted plans and specifications for the upgrade with the intent of standardizing pumps and accessories whenever possible, to enable Public Works to start a reasonable parts inventory for the stations. Currently nearly every lift station is different, with few interchangeable parts. The City Engineer and Staff are prepared to request bids for this project with the intent of . completing it yet this year. Severe weather may cause some delays but normal winter weather should not be a significant factor for this type of work.