607 RIVERSIDE RD 2021-01-29 - Laserfiche WebLink

• • Ms.Sabrina Fendler,PE May 21,2018 2170746.10 e • condition.All ponding is contained onsite.There is no overtopping or ponding downstream of the site due to the completely closed and watertight system. vi. The source control information in Appendix C appears to be taken from the 2010 Stormwater Management Manual. Please update the source control information to the current manual. Response: The correct BMPs have been updated in the report. vii. Identify the limits of the Stormwater Detention/Storage areas on the plans. This will allow future maintenance personnel and inspectors to identify that the flooding is intended and not a failure of the stormwater system. Response: The limits of ponding for the largest design event have been added to Sheet C3.0 of the plans. viii. The plans should identify the existing/to be constructed stormwater lift station located in the sidewalk near the northeast corner of the site. A note should be provided requiring protection of this facility. Response: A note has been added to Sheet C3.0 to protect the existing stormwater pump station. ix. DCSS Section 4-4.1 (3)requires that all underground stormwater facilities be setback from property lines a minimum distance equal to the depth of the exaction to install the facility. Verify that the filter cartridge vault meets this criteria. Response: The excavation for the filter vault will be 5 feet below existing grade.The filter vault is located 6 feet'from the property line. A dimension has been added to the drainage detail on Sheet C3.0. x. DCSS Section 4-4.2 (3) requires that lids larger than a standard manhole lid be hinged for ease of access. Please ensure that the lids to the filter cartridge vault meet this requirement. Response: The lids provided on the filter unit include two 36-inch lids with inset 24-inch lids.The 24-inch lids can be removed for inspection of the facility.The 36-inch lid would be removed during a full maintenance operation of the facility.The 36-inch lid ring can be removed by a single person,just as easily as the 24-inch lid.A detail for this lid has been added to Sheet C3.1 on the plans. xi. For the next submittal please provide the O&M Manual as a standalone document and include the following items. A copy of the O&M manual may be included in the drainage report or adopted by reference. 1. The party responsible for maintenance and operation; 2. The requirement for the O&M Manual to be retained on or within reasonable access to the site;