06-14-2004 CC MIN - Laserfiche WebLink

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City Council Minutes June 14, 2004 5. Worksession Page 2 5.1 Draft LVastesvater Treatment Plant Master Plan City Engineer Terry Maurer indicated that the initial review of the emstmg Wastewater Treatment Plant (W~TP) facility and the emsting sanitary sewer collection system, relative to excess capacity, has been completed. Three components and three district areas were outlined in the draft Comprehensive Plan. Mr. Maurer stated that it has been determined that the capacity of the plant could be expanded rather significantly with a minimal amount of land acquisition at the WWTP site. This land could be acquired from Great River Energy. The land would be approximately one-half acre. He stated further that the initial analysis has been completed of the emstmg sanitary sewer collection system, relative to excess capacity, for coverage from three identified study areas to the treatment plant location. He presented a sketch plan of a future layout of the WWTP site and a map of the e.,dsfing WWTP collections system. Mr. Maurer explained that the best number that staff could come up with if the whole current urban district was developed would be 3.1 to 3.15 million gallons per day. That figure is a litde bit higher than what was projected in 1995. The difference may be that residential developments are denser than they were projected in 1995. At that time the city ~vas looking at 10,000 - 14,000 square foot lots and since 1999 we are seeing a lot more townhomes. We are seeing higher density than we had projected. The reverse is going to be true in the commercial/industrial areas. Right now we are reserving 1000 gallons per acre for that land according to textbook numbers. Mr. Maurer used Menard's as an example, which sits on 11 acres, and it doesn't generate 11,000 gallons of flow per day. He stated that we could have excess capacity available. He stated that the three areas to be looked at would be an area east of Co. Rd. 40, the Cargill property, and the gravel mine property. Regarding the east of County Road 40 area, Terry indicated that we could pump an additional 250,000 - 300,000 gallons per day through the e,,dsting Trott Brook Farm area without changing any infrastructure already in place. Staff looked at a concept plan with a school site penciled in, and Mr. Maurer felt that there is capacity for what has been talked about. He stated that in the Cargill area, the same type of capacity (250,000 - 300,000 gallons) is available. The trunk facilities can accept this amount of flow. The trunk line flows to the Highway 169 lift station. This is also where the east County Road 40 flow goes. The additional capacity at this lift station is 500-600,000 gallons per day. Terry stated that if the council is looking to develop the gravel mine area with a capacity of anything over 100,000 gallons, a whole new lift station would need to be built. If so, the Council would need to reserve a large enough area to consider the urban development to be cost effective. He stated that he has not had any cost analysis. He stated that basically it is two pieces: the feasibility of expanding the urban services and the master plan at the Wastewater Treatment Plant. He stated that we should wait to do the f'mal report until after the Comprehensive Plan was adopted so that all the plans can be consistent. Sometime in the future the council will have to make a decision to expand the Wastewater Treatment Plant to the point where all development areas can be handled. Ter~ stated that the market would dictate making that decision. He was asked if it would be feasible to build a second plant. He said that it certainly could be done, but that from a cost standpoint it would be less to expand in the lower section of the city. It would be better to look at one plant versus two and to build the infrastructure to get down to that plant.