Laserfiche WebLink
9 <br /> Mr. Don Bluhm -- <br /> • Metropolitan Council of Environmental Services <br /> St. Paul,MN <br /> October 13, 2000 <br /> Page 2 <br /> the flow,however any minor pump problem or flow increases due to the known I/I,results in basement <br /> backups in the lift station vicinity. There are additional areas downstream from the lift station in both <br /> St. Anthony and the City of Minneapolis that also suffer backups so the pump capacity cannot simply <br /> be increased at this time. In order to accommodate the existing influent flow at the Harding Street site <br /> without backups and in order to not contribute to the downstream problems, an alternate route for the <br /> forcemain was proposed. The new route will direct the flow into the City of Minneapolis system,away <br /> from the problem area in St. Anthony and away from the area of concern in the City of Minneapolis. <br /> Using the Design Flow Determination Guidelines from the Minnesota Pollution Control Agency we <br /> have projected the needed pumping capacity as follows: <br /> 1. 140 homes @ 274 gpd/house 38,400 gpd <br /> 2. Existing Commercial Uses <br /> Service Station and Car Wash 5,300 gpd* <br /> Custom Products 4,200 gpd* <br /> Animal Hospital 530 gpd* <br /> 3. Future Commercial Uses <br /> Animal Hospital Expansion 530gpd <br /> 3/4 Acre Vacant Parcel @ 1500 gpd/Ac 1,125 gpd <br /> Sub-Total Wastewater Peak Flow Using 200,000 gpd= 139 <br /> Peaking Factor of 4 for Pump Design gpm <br /> Additional Flow Non-Cost Effective I/I <br /> Estimated 75% of Connections and Peak Day Rate of =94.5 gpm <br /> 0.9 gpm/connection <br /> 140x0.75 x0.9 <br /> TOTAL PEAK DESIGN FLOW FOR PUMP 233.5 gpm <br /> *From water usage records. <br /> We realize that this design flow accommodates the current anticipated I/I flow level and we feel that this <br /> is necessary at this time to reduce the potential for basement backups in the vicinity of the lift station <br /> until the I/I flow can be reduced. The City is committed to addressing the drain tile connections,but the <br /> need for the new lift station is immediate. <br /> As requested,we have developed the following schedule for the next phase of the private property I/I <br /> source reduction program. <br /> Task Schedule <br /> 1. Point of Sale Removal On-going program since 1998 <br /> • 2. Public Education Program by Target Areas 2001-2003 <br /> FAW P W IM 1065-45\101300db.wpd <br />