06/08/1998 Council Packet - Laserfiche WebLink

Home Search

Memo To: Dave Ahrens A n 1 (--' From: Michael W. Krech 11 ' \ w Date: June 3, 1998 Re: Laurene Avenue Lift Station Change Orders As you are aware, there were two change orders for the Laurene Avenue Lift Station project. The first change order was needed when the concrete wall of the lift station had a concrete patch that was unsuitable for core drilling in the vicinity where the new force main pipe was to connect to the lift station. This condition could only have been discovered by excavating next to the lift station. The second change order provided an improved electrical service to the lift station and modification to the panel. The previous lift station at Ware Road was serviced with single -phase power, which was converted at the lift station to triple phase power. NSP agreed to provide the new location with 240 -volt triple phase power. The existing service for the Met Council's facility was 480 -volt triple phase power. The service wiring was replaced so that the meter could be located on the lift station panel. The Met Council's meter was located on a pole about six feet from where the control panel was installed. Since an electrical service cannot be spliced, the options were to re -use the existing meter location or install a new service to reach the panel. Installing a new service was chosen because it allowed us to remove the meter pole. The only remaining above ground structure is the panel. This is preferable for security and aesthetics. The new service wire was installed in conduit (the old service was not in conduit) and the wire was sized properly. NSP typically would not have allowed a service on this type of power line to be reinstalled as triple phase. However, in this instance it greatly benefited the city at a minimal cost to NSP. • Page 1