Agenda - 04-02-1990 - Laserfiche WebLink

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1p n ir 0 UNIVERSITY LAKE WATERSHED PROTECTIO N • At the March 8 , :990 meeting of the Chatham-Orange Wo=k Group, the group failed to achieve a •consensus for modification of tne impervious surface provisions ' in the :3-point agreement . The Orange County Planning Director , Marvin Collins , nas proposed changing the impervious surface limit from 4% to 6%G for 5-acre lots and a sliding scale for lots smaller than 5 acres . Ideas discussed at the March 8 meeting included : a . Reduction in the number of 2-acre lots permitted under point number 5 . a. 2 . Public acquisition of land or development rights sufficient to result in equivalent protection: 3 . Use of impervious coefficient somewhere between 0 and 1 . 0 to recognize that gravel driveways are not as impervious as ' roof tops or paved roads . 4 . Use 4:o figure for new developments , 5% for existing lots . TEE DEBATE Those in favor modifying the impervious surface limit arcued that , according to Mr . Collins ' calculations , the number of non- conforming lots would be unacceptably high (approx. 40%) . Those opposed to modification argued that the CDM recommendations were aimed at minimizing f::rtner pollutant loading of the Lake and that the :3-paint agreement already included compromises that were less stringent that recommended by CDm. CDM SHORT-COMINGS The CDM report recommended that impervious surfaces be limited to 4t if the non-structural utilized.ral approached were utilized. They failed y to take into account ,di _iculties this approached would encounter . • _ dealing witn that portion of the watershed in Chatham County and with existing roads and lots smaller .pan. 5 acres . RECONCILIATION The d:_ ference between the 1.3-point agreement and tne Orange County staff proposals is not as sign:f:cant as has been thought if a distinction :s made between average ' _mperv:ousness and the • fed for ndiv_dua' lots . Mr . Collins ' calculations ..�al_i::um permit .. � - indicate that , for an assortment of 5-acre lots , approxtmately 98% compliance can be achieved by use of an impervious surface maximum of 6% •der lot and that the average for the assortment 4Y . Thus , the inte^ of the _3-point agreement would be about us it -t , was to limt t impervious surface to an average of 4% , the two proposals are equivalent .