03-09-1998 Council Packet - Laserfiche WebLink

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Zoning File #2338 February 12, 1998 Page 3 1.The ponds should be graded to include a 10:1 aquatic bench at the normal water level. The bench should be at least 10' in width to provide a vegetative safety buffer. (Note that golf course ponds commonly do not have such a bench at the normal water level, but have relatively steep slopes to allow retrieval of errant balls. There are two potential reasons for the 10:1 bench. The first is clearly as a safety buffer. The second is that such construction more closely resembles the NURP pond design which allows the vegetated buffer to uptake nutrients and provide better water quality treatment). A potential but not thoroughly discussed benefit to either the applicant and/or the City would be the use of these newly created ponds for wetland credits towards other projects. If these are created as permanent wetlands, such wetland credit might be of value to offset wetland impacts elsewhere. 2.Emergency overflow elevations should be verified and their locations shown on the plans. Note that neither pond has an outlet structure proposed, and it is unclear on the pond near the 18th tees as to the absolute overflow direction. There may be some benefit in forcing that pond to overflow to the large pond rather than to the east, since no downstream residential properties would be impacted by super-storm type flows. The Engineer also notes that erosion control measures should be provided at the overflow points. 3.In conjunction with the above, applicant needs to identify the invert elevation for the 12" culvert heading eastward under North Arm Drive from the 18th hole pond. 4.The proposed plans do not indicate any intent to import or e.xport material from the site. If such hauling is expected to occur, spoil site locations and haul routes must be identified. 5. Erosion control measures must be in place prior to the start of construction. Conservation and Flowage Easements? The City has neither normally nor consistently required the dedication of conserv'ation and flowage easements over golf course ponds that are created in upland areas not identified as protected wetlands. The golf course ponds are generally decorative in nature, and, as in the current proposals, located in drainage ways or relatively low land areas where maintenance with mowing equipment is often hindered by soft ground. In both cases, the proposed wetlands have minimal wildlife value, and are relatively small as compared to most natural wetlands the City has intended to protect! Rather than requiring conservation and flowage easements over these two specific wetlands, staff would recommend that either no wetland easement be required at this time, or that wetland easements be granted over ever>' identifiable wetland on the golf course. J