Agenda 06-04-2019 6-a - Major Subdivision Preliminary Plat Application

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97 Tim Smith: It would be bigger SCMs, more disturbance area. We're trying to do low impact, minimize our disturbance, minimize our impervious areas. We would have to cut more trees and make a bigger space to provide that control. Patricia Roberts: If you have a lot of pervious ground,then you are not going to need as much as you think. You've got the natural way for water to be a absorbed into the ground and you're just trying to take over probably what you have made impervious. The tradeoff, I would rather have more trees. Tim Smith: With the one inch,they also call it water quality also. They call it the first flush. That first hard one inch of rain hits all the pavement areas where all the nasty stuff is and that's what runs off first and that's what we're required to treat first for nutrients and water quality. Kim Piracci: Is the impervious, pervious areas taken into consideration when you decide how much? Tim Smith: the project as a whole,we're very low on total amount of impervious. The allowed maximum for this property is 36 percent and we're only proposing about 17 percent. Kim Piracci: What would happen if you made 15 units instead of 20;would you then still have the cut down as many trees? Tim Smith: Potentially not, but that's all a balance of everything else we've talked about. Patrick Mallett: The way this typically works for a single-family residential subdivision is it's a bit of a calculated right sizing in terms of runoff and stormwater. Looking back at the layout. You want to put your open space and the devices in the right place and then routing stormwater that would go through ditches into pipes. A big part of their design and a analysis is to locate them in the right place, right size them, and assume that they built it and designed it and located it appropriate for the initial clearing,the initial impervious to carry the freight for the public roads, and then assume a theoretical clearing and an impervious amount for each of the lots. Part of the analysis is to factor in the impervious water quality,water quantity and then the rate of runoff. Jim Ray: My name is Jim Ray. I'm Occoneechee Golf Club. We were the ones going to get the water. I just want to ask Tim how much more water are we actually going to get then we're getting now? If you can get the state to build a culvert the first one west of where you all going to build, that would solve a whole lot of our problem. Tim Smith: It's hard to say. The intent is always in following the guidelines that we have the follow. To keep it basically as it was before the development was there. Jim Ray: That's too much. Tim Smith: The numbers that we are required to adhere to are no more post development than predevelopment. Jim Ray: I'm not against the development, but I would like to have as much help as we can to stop the water. The left turn lane, how much more pavement is going on our side of the road and where is the ditch line going to be then? Tim Smith: We don't have the final design. We're doing a proposed symmetrical widening. On your side right now, the pavement will get about three feet wider than where it is right now. If it looks like it's going to be a problem on your side of the road,we can shift the widening to be more on the project side with less impact on your side so we're not having to push ditches and that sort of thing. Jim Ray: We don't need to lose anymore property. Tim Smith: Everything we do has to be within DOT's right of way. It's not going to be on your property. Hearing your concern,we want to keep everything we can away from you.