Agenda - 02-28-1990 - Laserfiche WebLink

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D /A I� UNIVERSITY LAKE WATERSHED PRCTECTION . Vw V��VF\ At the March 8 , :990 meeting of the Chatham-Orange work Coup, the group failed to achieve a consensus for modification of the impervious surface provisions in the ;.3-point agreement . The Orange County Planning Director , Marvin Collins , has proposed changing the impervious surface limit from 4 , to 6% for 5-acre lots and a sliding scale for lots smaller than 5 acres . Ideas discussed at the March 8 meeting included: 1 . Reduction in the number of 2-acre lots permitted under point number 5 . a. 2 . Public acquisition of land or development rights s;._ficient to result in equivalent protection. 3 . Use of impervious coefficient somewhere between 0 and 2 . 0 to recognize that gravel driveways are not as impervious as roof tops or paved roads . 4 . Use 4% figure for new developments, 6% for existing lots . THE DEBATE Those in favor modifying the impervious surface limit argued 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.._ ther pollutant loading of the Lake and that the I3-point 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 4% if the non-structural approached were utilized. They failed to take Into account dirficul ties this approached would encounter in dealing with that portion of the watershed in Chatham County and with existing roads and lots smaller than 5 acres. RECONCILIATION The difference between the 13-point agreement and the Crange County start proposals is not as significant as has been thought if a distinction is made between average imperviousness and the maximum permitted for individual lots . Mr . Collins ' calculations indicate that , for an assortment of 5-acre lots, approximately 98% compliance can be achieved by use of an impervious surface maximum of 6% ter act and that the average for the assortment would be about 4`' Thus, the intent the , a. _._us, _r ...e ten. cr ...e _3-po:n: agreement was to limit impervious surface to an average of 4% , the two proposals are equivalent .