03/22/2004 Council Packet - Laserfiche WebLink

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Eagle Brook Church page 7 Residents have questioned the water use /wastewater generation assumptions used as the basis for the design of the church's wastewater system. For comparison purposes, the Metropolitan Council uses a sewer availability charge (SAC unit) as a basis for billing for sanitary sewer service. One SAC unit is based on 274 gallons per day. Churches are charged one SAC for each 275 seats. For a 2100 seat church, this would be 7.64 SAC units, which calculates out to an estimated 2093 gallons per day. If the church expands to 2800 seats, this calculates out to 10.2 SAC units, or 2795 gpd. Weekly worship schools are charged one SAC (274 gpd) per 55 students. The Eagle Brook System is based on a treatment capacity of 2800 gallons per day. Water Well: The existing well on Lot 2 is indicated on the plat. It is within the property lines and properly separated from the secondary drainfield location. A new well will be created for the church. If municipal water service becomes available, the church should be required to connect. This is included in the conditions of approval. As a condition of plan approval, utility related modifications and comments as set forth in the City Engineer's memo should to be incorporated into the final plans. Wetlands, Grading, and Stormwater Management: Four wetlands are located on or partially on the project site. One is part of the shoreline of the lake in the southwest part of the site. Another is near a depression surrounded by wooded upland. These two will not be disturbed by the proposed church project. A third wetland is a swale in the northwest area of the site which is surrounded with tilled farmland. The fourth is on the northeast corner of the site is part of a larger wetland located mostly north of the site. These two wetlands are drainageways and have been degraded by agricultural runoff and are vegetated primarily with reed canary grass. The plans show a 25' setback from the wetlands. No building or pavement would be placed in these areas. Under City requirements, all wetlands must be protected with a drainage and utility easement. This will be enlarged to include the 25' setback. County Ditch 72 is an underground drain tile, including the stretch crossing the property. The main branch of County Ditch 72 begins about 4300 feet southeast of the site. Branch 1 of the ditch begins about 2500 feet south of the site. These merge on the site, then drain into the swale wetland, which then runs into the lake. Currently, there is no pretreatment of runoff in the tile ditch system or runoff from the agricultural land before it flows into the wetlands and lake. The proposed stormwater design shows that runoff will be collected by a series of swales, infiltration areas /rain gardens, and stormwater ponds, providing pretreatment of all runoff from the development. The Rice Creek Watershed District has review authority over the stormwater design and issued a conditional approval in October 2003. The county ditch will be rerouted, in a new underground drain tile, around the development area. This was required by the Resolution 04 -17, page 7