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

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96 sometimes does result in projects that may not necessarily focus or factor on an addressing an affordability concern. Ultimately this property will not yield sufficient density to make development of what some might construe an affordable housing project viable but this project does focus more on the preservation and protection of the environmental components related to the property. David Blankfard: In the packet on-pages 40 and 41,you have a memo from Mr. Fleming, the stormwater supervisor. Can you explain what his conclusions were? Michael Harvey: I can try. I'll remind you about what I told you last month when the concept plan was reviewed. This project will have to go through a stormwater permitting process. The process will have to demonstrate that proposed stormwater facilities will not only comply with our code, but also address nutrient reduction requirements. I think that what Mr. Fleming is attempting to identify is that he would like to see the SCM, stormwater control measure,to accommodate more of the potential development on the housing side not just the roadways and overall land disturbance activity for the project. Mr. Smith has indicated this evening that they are going to be looking at each individual lot in terms of some disconnected stormwater flow feature to address on lot development activities,so you don't have to over design the stormwater feature which actually incorporates some of the low impact design elements. This is an attempt to try to address some of the duality of the ordinance with respect to how do we comply with the stormwater standard, and at the same time, how do we achieve reasonable development of property. David Blankfard:What I'm understanding is you are going to take care of some of the runoff on the individual pieces of property. Tim Smith: The ones we can,yes. David Blankfard: If you can't take care of it on the property you're going to pipe it over to the SCM. Tim Smith: Since this letter,we've done more in regard to what his concerns were, and we're headed in the direction that we need to be for the overall project. We're increasing the size of our primary device areas,so they have more capacity and we're also incorporating a tiered approach to stormwater to obtain the treatment required for the entire property. Michael Harvey: Just to reiterate, Mr. Smith has gone through a rather detailed recitation of the various techniques they're looking at. As part of your recommendation, you can ask the Board to consider that if they choose to adopt this project,that those suggestions be incorporated in the resolution of approval and that these are the steps that the applicant will take in terms of addressing and incorporation of low impact design elements. This project cannot be a process of low impact design development because it exceeds thresholds. I think it's perfectly reasonable for this Board to recommend to the County's Commissioners to consider making that a requirement as part of the resolution of approval if it gets approved. Kim Piracci: Even if they build in three,four, different ways to control flooding, it's still only stormwater measurements of one inch of rainfall in 24 hours. They don't have to accommodate three inches of rainfall. Michael Harvey: No, that's the minimum base standard as currently contained within the UDO. Hunter Spitzer: Is that standard set by the state or can we change that? Michael Harvey: The State establishes minimum guidelines and requirements. If we choose to be more restrictive we can do that, but the State would have to give us the authorization to do that. If this Board is interested, it could request the County Commissioners to study whether or not there's an opportunity to implement a higher stormwater management standard that should be adopted recognizing that there are impacts. Of course with more restrictive standards comes higher development costs,which can translate to more expensive homes. David Blankfard:Tim, if you did treat it more than one inch,what would that impact be on your SCMs?