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Planning Board minutes 050119
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Planning Board minutes 050119
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9/10/2019 3:29:01 PM
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Date
5/1/2019
Meeting Type
Regular Meeting
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Advisory Bd. Minutes
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Approved 7/5/19 <br /> <br />has approved this layout as we continue on we’ll be adding the grading for that and all the details that go with it. As 275 <br />Pat mentioned, we did keep the entrance location far enough west so that none of the widening would impact this 276 <br />box culvert that crosses under Highway 70. We are staying far enough west that our widening will not impact any of 277 <br />that box culvert. Since last month, we’ve continued on and added the required landscaping to show on our 278 <br />landscape plan for you. As Pat mentioned, we have the required street trees that would be planted along each of the 279 <br />streets. This is per the ordinance requirements that you have to have a street tree spaced primarily every 100 feet 280 <br />with other small plantings between. This is a rendering of how we feel it would look once all is in place. The primary 281 <br />goal would be the preserve all the trees that are out there now along that buffer. To go over the stormwater 282 <br />managements for Orange County, this is Section 6.14 from the ordinance, we have to follow and meet the guidelines 283 <br />for Orange County which are all based on state regulations. We would need to protect the repairing areas, monitor 284 <br />the nitrogen and phosphorous load contributions that are proposed based on the development, and attenuate the 285 <br />flow which means we can’t have any more flow leaving the site than prior to the development. Our devices need to 286 <br />manage that stormwater runoff and control the first inch of rainfall from all the project areas on the site. To treat the 287 <br />nitrogen and phosphorous we have to have a 85 percent TSS, total suspended solids, removal achieved through the 288 <br />devices that we install. These are the standards pretty much state wide. Orange County implements these same 289 <br />standards based on where they are in each river basin and each watershed. In that regard, we are proposing a 290 <br />multiple attack on stormwater. One would be disconnected impervious services on each lot which kind of covers the 291 <br />runoff from each roof, having treatment swells in areas where the runoff can’t get to our primary stormwater devices,292 <br />and level spreader filter strips used in connection with other stormwater devices including in buyer retention basins. 293 <br />Some folks were concerned about the stormwater and had discussed low impact development. We approach every 294 <br />project with a low impact development, approach. If we can meet stormwater requirements and treat stormwater 295 <br />based on a low impact design, this is our primary goal. In a true sense of a Lid analysis, you check your site prior to 296 <br />development, see how much trees are there, how much open areas there are, how much pasture, the types of land 297 <br />cover, and then you look at it again after proposed development with the houses, yard areas, in preserving tree areas 298 <br />and so forth. You check and see what the differences are in the different rates and these involve: infiltration of water 299 <br />into the ground; and then the runoff that occurs from the impervious that’s added. We run it for this site, and it did 300 <br />not meet the percentage threshold for a true Lid design. In the rural design requirements, per this manual that was 301 <br />started back in 2009, they referred to the Best Management Practices to use devices like infiltration devices, level302 <br />spreaders, sand filters, pocket wetland, and permeable pavers to manage stormwater in a low impact manner. 303 <br />304 <br />Hunter Spitzer: You said for the Lid on the water treatment that you did not meet the percent required.305 <br />306 <br />Tim Smith: The LID manual is not a regulated booklet. It’s a guideline for how you would do a LID analysis. It was 307 <br />just a little over the threshold of what it needed to be. If it met the requirements, we wouldn’t have to do anything. 308 <br />Because of the type of development it is, we are above that threshold and so we have to implement stormwater 309 <br />control per the UDO. 310 <br />311 <br />Patrick Mallett: Low impact design in terms of Orange County and stormwater and erosion control is a classification.312 <br />By virtue of the amount of land disturbance just for the roads, it brings it out of that category in terms of the 313 <br />stormwater classification. In Orange County, whether you are a low impact designer or not, determines the cost per 314 <br />acre for your stormwater permits and how you are classified. There is also a difference between low-impact design 315 <br />as it’s classified, required, or evaluated which causes the requirements for your stormwater and erosion control. You316 <br />can still do low impact principals. Two points I would like to clarify. When I discussed the building setbacks around 317 <br />the perimeter, that’s the perimeter setback which is 100-feet around the perimeter of the project. You also have an 318 <br />offered 120-foot building setback along US 70. You have single family lots; those also have building setbacks. 319 <br />They’re proposing you have 30-foot front set back, and 15-foot side and rear setbacks. There are four lots along US 320 <br />70 that technically could have a well as close to 50 feet to the right of way, but you still have to meet the landscape 321 <br />requirements so in essence they would tread lightly and use that as a last resort, because if you take out a tree or 322 <br />don’t meet the landscape requirements, and you put in a well or a septic system that you can’t put landscaping in, 323 <br />you have to find some other place to put it. That can eventually become mathematically impossible. 324 <br />325 <br />Tim Smith: We are looking to approach to our stormwater management where we’ll have multiple treatments from 326 <br />several different types of devices which are all in the realm of low impact devices with how we treat the water. I just 327 <br />wanted to go over this to give you a further perspective on how we propose to finish our design with regards to 328 <br />stormwater. 329
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