CC PACKET 08141990 - Laserfiche WebLink

Home Browse Search

April 3, 1990 • Mr. Nile Fellows MPCA 520 Lafayette Road St. Paul, MN 55155 Re: Modification Well House No. 3 St. Anthony RCM File No. 14027.01 Dear Mr. Fellows: As a follow-up of your letter of March 15, 1990, and our meeting of March 30, 1990, the following cost items were discussed. The initial request for an engineering proposal was based upon bringing the existing electrical service at Well No. 3 up to code and evaluate the electrical service to the water treatment facilities. The immediate problem was the overheating and tripping out of the well pump starter. Our contract with the City of St. Anthony is based upon a salary cost times a factor with a not to exceed rieke number without further authorization by the City Council. Carroll muller During our investigation, the major source of the problem with the motor associates,inc. starter was heat building up inside the building. The existing ventilation meers system was inadequate in remove the heat generated by the existing 125 hp itects motor. Because of the continuing dropping of the water surface in the well. land surveyors especially during the summer months of heavy usage, a larger motor is equal opportunity required. Thus, the heat generation will increase. An adequate ventilation employer system was designed to reduce this added heat build-up, thus permitting continuous operation of the increase pump motor. The additional ventilation work increased both final estimated construction cost and the corresponding engineering fee. The use of a larger motor at this locality necessitated the use of a reduced voltage starter. The in rush current of a normal across the line starter would cause .an untolerable dip in the line voltage, affecting both the existing treatment facilities and the new GAC facilities. The use of this starter increases the construction cost by $6,000 to $7,000. The existing control system has been retained and will be reincorporated into the project. Once any electrical work is performed on an existing installation, the electrical system must be brought up "to code". The replacement of all the electrical .equipment in Well House No. 3, except the control system was deemed necessary including the temporary bypassing required to minimize down time of the existing water treatment plants and booster pumping station. This downtime will also effect the new GAC facilities presently under construction and the temporary GAC just west of the well house. The interrelationship of these systems and the related initial construction and engineering costs were under estimated. Wells Nos. 4 and 5 have their own • independent power supply. 10901 red circle drive box 130 minnetonka, minnesota 55343 612-935-6901