02/11/2008 Council Packet - Laserfiche WebLink

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• • Main Street Village page 3 The Wetland/Aquatic and Upland Habitats map (AUAR Fig. 10 -2) does not show any core or outlier habitat areas that we want to preserve. Water finality, stormwater management, erosion and sedimentation: The AUAR includes analyses of surface water runoff issues which lead to requirements for including infiltration elements and other techniques. It also includes estimated stormwater management recommendations for specific development areas. These estimates in the AUAR cannot be considered strict requirements. However, they do provide guidance for mitigation. The approach is that stormwater management areas would be designed consistent with strict criteria for maximum filtration and/or infiltration of stormwater. The site is labeled development area Y -TD in the AUAR The most general estimate suggests that 16 % -20% of the developable area would be needed for stormwater management (AUAR Fig. 17 -3). A somewhat more refined estimate suggests a need of 5 acres for stormwater management (AUAR Table 17 -5). These estimates are calculated for the entire 28 -acre site and are high compared to standard development practices. The submitted project only includes about a third of the total site (less than 9 of the 28 acres), so it is difficult to compare against the AUAR Nonetheless, we can see that stormwater treatment is a challenging issue and it is important to consider the entire site rather than individual pieces. While those stormwater management areas are estimates and not mandatory, the AUAR does include specific requirements. Runoff rates (gallons per minute) must be at or below pre - development conditions. This is a standard requirement everywhere in the city, enforced on all projects. The AUAR also requires that runoff volume (total runoff) must be no more than 150% of pre - development runoff. (This is one reason the stormwater management area estimates are higher than standard practice: standard practice does not address limiting runoff volume, only rate.) The AUAR also requires that stormwater management areas have a 6:1 slope rather than the normal, steeper slope. The plans for phase one of the development will meet the rate, volume, and slope requirements of the AUAR. Future development (phase two) will require review to ensure it meets these requirements as well. Archaeological Survey: A Phase 1 cultural resources survey was completed for the site and submitted with the project, as required by the AUAR The farmstead site was found to be not eligible for historic listing. The survey investigators recommend that no further cultural resources work is necessary. AUAR Fee and Environmental Review. The City Council adopted a fee for new development within the AUAR area.. This fee was based on the cost of the AUAR and calculated by anticipating that growth will occur first in the Stage 1 and 2 growth areas depicted by the Comprehensive Plan. The fee is $269 per acre, and 28.3 acres x $269 results • in a fee of $7612. The fee goes toward the costs of preparing the AUAR and is justified because no environmental review is needed for projects within the AUAR area as long as the projects are consistent with the development assumptions in the AUAR. The AUAR fee of $269 per acre must be paid prior to site work commencing.