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<br />RCWD Alternative Compliance Sequencing Report <br />City of St. Anthony Village PAGE 12 <br />WSB Project No. 1626-53 <br />reasons discussed below, it is not reasonable to consider biofiltration BMPs <br />as a feasible option for the City to pursue in the narrow space available. <br /> <br /> Public Utilities <br />Placement of drainage infrastructure including BMPs, is not typically <br />allowed within ten horizontal feet of a watermain. The City’s utility design <br />standards offset the watermain approximately ten feet from the center of the <br />road where the sanitary sewer is located. This positions the watermain in a <br />manner that does not allow BMPs to be constructed near the curb line on <br />one side of the street. In addition, the City does not allow placement of <br />utility services under drainage BMPs so that the service lines can be <br />maintained or reconstructed without damaging BMPs. <br /> <br /> Topography <br />In many cases, the lots adjacent to the street have been well-established and <br />include trees, landscaping, driveways, carriage walks, and other obstacles <br />that, while are desirable to the City and its residents, do not allow for BMPs <br />to be constructed. In many cases, basins within the boulevard cannot be <br />constructed due to the adjacent lot and house elevations. <br /> <br /> Maintenance <br />Efforts for maintaining many small facilities within the boulevards are <br />substantial and need constant attention. If timely maintenance is not <br />performed it can lead to premature failure of these types of BMPs, and result <br />in costly BMP reconstruction efforts. The City encourages the use of <br />regional BMPs to limit the number of sites that are a focus for maintenance <br />efforts. <br /> <br /> Efficiency <br />Since a reasonable amount of space is not available within the right of way, <br />any basins constructed would have a very small capacity, and would not <br />provide an efficient means to treat stormwater runoff. By using regional <br />water quality BMPs, the efficiency of the BMPs will increase substantially <br />resulting in better downstream surface water quality. <br /> <br />D. Filtration <br />Additional opportunities for filtration BMPs within public properties are also <br />limited and generally not possible. This is due to the space constraints, public <br />utilities, and topography associated with constructing these BMPs as described in <br />detail under the biofiltration option above. <br /> <br />E. Wetland Treatment System <br />Options for implementing a wetland treatment system within the City have been <br />investigated. Due to topography and major drainage conveyance systems present,