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1) a 10 foot wide safety bench for every three feet of <br /> design water depth and the side slopes of the pond are no <br /> greater t_han J: 1 (H:V) ; or <br /> 2) the maximum water depth of the facility does not exceed <br /> three feet during a two year storm, nor exceed three feet <br /> for more than four hours for a 25 year storm; the side <br /> slopes are a maximum of 3 :1 (H:V) ; and the facility is a <br /> dual use facility; or <br /> 3) apecific City Council approval is granted for an <br /> exemption per the criteria in the City�s Design and <br /> Construction Standards and Specifications. <br /> If fencing is required, its exact location and also the <br /> ✓ location of the gates necessary to access the pond for <br /> maintenance mus+: be shown. <br /> � Before the existing detention facility is modified and/or <br /> � used to detain stormwater from this project, the existinq <br /> • earthen dam should be checked for structural integrity and <br /> safety and approved by a geotechnical enciineer. <br /> Construction of the storm drain and manholes from manhole k2 <br /> to the outlet in the existing detention pond should not be <br /> atarted before J�ne 15 of any year, and should be completed <br /> by October 1 of the same year. Construction should occur <br /> during dry periods only. <br /> Zn the temporary er�sion control construction sequence, item <br /> 6 should include a requirement for immediate stabilization <br /> of the area dist�rbed during the installation of the storm <br /> drain and manholes from manhole #2 to the outlet in tha <br /> pond. Seeding should occur along with placement of erosion <br /> control blankets, or jute netting over straw, on slopes <br /> greater than or equal to 25$ and in the lower areas where <br /> water flow occurs. Straw alone should not be used anyplace <br /> where it may be carried by surface flow to the pond. <br /> Analysis of the natural drainage way to the existing <br /> / , -{ '"� � detention pond must be provided to show that the desiqn <br /> c �� � ,� �� diversion flows will not result in erosion of the channel . <br /> „ � Factors to be used in the analysis should include channel <br /> ; �, �� �/ characteristics such as general cross-section, longitudinal <br /> slopes, soil types, and veqetation type and cover. <br /> Additional comments are written directly on the plans. <br />