Agenda - 06-01-2010 - 6a - Laserfiche WebLink

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41 121 Craig Benedict: Yes. In this area, the differentiation is how many houses per acre and the impervious percentage. The 122 difference is 6%imperviousness in the critical and 12%in the protected. 123 124 Perdita Holtz: There was a table included in our public hearing materials and also on our website. 125 126 Larry Wright: We talk about dwellings units per acre or structures or impervious surface, do we consider at all, the soil rype 127 because it is known that in northern Orange County especiaily that it is very impervious soil type and is that factored in your 128 runoff coefficients and so on. 129 . 130 Craig Benedict: There was an assumption throughout Orange County, even though soils are different,the clay soils and even 131 some sandy soils still do not have good qualities of percolation so the 6%and 12%take that into consideration. Everything 132 shown on this map for septic systems,red is severe limitations,the yellow is moderately severe. I won't say that the great septic 133 soils you have in other parts of the country,I think North Carolina has some trouble and the mountains for steep slopes problems 134 that because of the clay in th�Piedmont has trouble and then you get to the sandy soils down east and you run into depth of 135 water table which creates problems. We do take into the consideration the difficult soils. Someone at the meeting asked about 136 why we count driveways as impervious even if they are gravel. The runoff from a gravel driveway is about 95%still. In prepared 137 lawns in North Carolina is about 50-60%impervious. It may be a year or two years from now,we had talked about giving peopie 138 benefits when they have a two acre lot if they preserve more native tree area. A native tree area only has about 5-10% 139 impervious. 140 141 Mary Bobbitt-Cooke: Going back to the map with the critical area,you talked about the part that you were going to propose to 142 move portions of critical area,what was the reason for that? 143 144 Craig Benedict: The reason we are backing this up is the counry has identified the Seven Mile Creek area since 1987 as an 145 important natural area. We are talking about this area,Hilisborough,this is the Eno River and this is the Seven Mile Creek area. 146 This is called a Natural Heritage site and the counry has actually purchased some land in that area shown on this map. We are 147 saying that most likely we will never build a reservoir here over top of these natural areas in the counry but suggesting that we 148 pull it back and at least protect the streams. Is that watershed protection for the intake of Hilisborough or is it for the protection of 149 the natural areas in here. I think the presentation on the 22^d was more focused on,it will improve water quality,is the focus of 150 that area probably more environmental than water supply,probably yes. 151 152 May Becker: You mentioned that Seven Mile Creek will probably never be a reservoir because, I guess that is not clear to me, 153 one of the things that came up in the town meeting was the question of why remove these potential reservoir sites as potential 154 reservoir sites because water is an important natural resource. My concern is that if we move a potential reservoir then if the 155 critical area is also reduced,then the level of watershed protection is reduced and the potential of protecting water in the future 156 would no longer be there. 157 158 Craig Benedict: Two things,either we protect future reservoirs as if they were going to be there and do the full half mile buffer 159 around it or protect the future reservoirs partially, not to full like it was flooded, but protect the streams that lead up to that 160 resenroir. What happens with this map is that you see us pulling back with the new description, notice the reservoir still fits 161 inside there. There were people who said if we are not to build a reservoir, IeYs get rid of the big critical areas and then others 162 that say that they might come here so why don't you protect all or part of it. We are suggesting that we protect an area,whether 163 reservoir or natural areas but not to the full extent so we can pull some of the Economic Development areas out in the Efland 164 area north of I-85 the way the line is now,it goes halfway up to the railroad tracks off I-85 so the development potential in Efland 165 village area is limited. Our proposai because we are only suggesting to buffer the streams and not the big reservoir anymore,we 166 are able to pull that line farther out. We are suggesting and asking the board to consider that the state says you can pull it out to 167 a roadway or other man made structure so we can pull back this proposed line to West Ten Road. A comment from the public 168 hearing was there was some land here that doesn't flow directly to the streams so that was more than the half mile distance so it 169 made sense. Some areas,green dots,we are suggesting is that before runoff occurs from any development in the Efland village 170 area that these can become erosion control and BMP devices before the runoff comes under the interstate. DOT owns the land 171 up here and we hope to work with them in the future to turn some of their erosion control issues into a bioretention area. 172 173 Mary Bobbitt-Cooke: Who owns the property in the area? 174 175 Craig Benedict: This is West Ten Road and this is the I-85 connector. DOT owns a big piece over here and a private land owner 176 here and two small houses coming down West Ten Road. After you get past this point,this is all Economic Development again. 177 - 178 Craig Benedict: We connect to that other line down here at West Ten. The way we would add this change is how we described 179 those other conditions on this map. To further define it,to exclude that area of the land north of the center line of West Ten Road 180 and west of the center line of the I-85 Connector. Some people may say forget the future resenroirs,forget the streams,block off 181 Seven Mile Creek altogether. I don't think there was consensus on that but that was an option, Protect the streams between the