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Planning Commission: February 25, 1998 Congregation Beth Am: Conditional Use Permit Page 2 provided at this time, however, is still not complete and staff has a few concerns with the appropriateness of the general concept of a detention basin. A detention basin is used to reduce the peak flow and velocity of water downstream, thereby reducing the potential for erosion. There have been a few detention basins built with other projects in the Town, that have provided staff with firsthand knowledge concerning the maintenance of the basins. Typically, the basins have either a concrete or asphalt lining in the bottom. While this provides for easier cleaning of the basin, it also has a tendency to result in standing water in the basins. The Town sometimes receives calls from residents concerned with mosquito breeding in areas of standing water and the eyesore of an algae covered"pond". Another important issue to consider is the annual maintenance of the detention basin. Since silt tends to settle in the basin, the bottom of the basin must be cleaned periodically in order for it to maintain its required capacity. Since the storm drainage flow into the basin includes runoff from parking lots which may contain gasoline and oils, the material must be disposed of at an approved location. If the detention option is approved, condition #13 of the conditional use permit would need to be revised to include a maintenance program for the detention basin. If a determination concerning the granting of easements by the downstream neighbors has not been reached by the time of the meeting, the Commission may either (1) approve the project with the stated conditions, or (2) ask the applicant if they want to defer the project for another two weeks to complete analysis of the detention basin option. Noise Standards At the Commission's request, staff has included as an attachment the Town Code standards for noise limitations. Also attached is a table of"typical" noise levels for your information. Environmental Review In accordance with the provisions of the California Environmental Quality Act (CEQA), staff has prepared a Negative Declaration to support the project. The Commission reviewed the Negative Declaration at the last meeting and suggested no changes. Staff is available to respond to questions from the Commission or the public. ATTACHMENTS 1. Exhibit A: Conditions of Approval for Conditional Use Permit 2. Exhibit B: Conditions of Approval for Site Development Permit 3. Exhibit C: Findings for Approval for Conditional Use Permit 4. Negative Declaration 5. Draft Minutes of February 11, 1998 Planning Commission Meeting 6. Noise Standards I