Agenda - 06-06-1988 - Laserfiche WebLink

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.. . . . 146 Al IWOrange Water and Sewer Authority 400 Jones Ferry Road OWASA P.O. Box 366 Carrboro, NC 27510 (919) 9684421 . . . May 2, 1988 h" :"-)1ECEIV rn, 1s ) 5-4--b:: L--;_,) Ms. Emily Crudup Planning Department Orange County 306F Revere Road Hillsborough, NC 27278 Dear Emily: SUBJECT: OWASA STAFF COMMENTS: PROPOSED OAK CREST SUBDIVISION - . . Orange Water and Sewer Authority (MAW staff has reviewed the April 6, 1988 plans for the proposed Oak Crest Subdivision. This project would be located within the University Lake water supply watershed; therefore, the subdivision should be designed and constructed in a manner which will not adversely affect the quality of the water within this drinking water supply source. The following comments are offered for consideration by Orange County during the project review and approval process. The G,JASA Board of Directors has not reviewed and considered the proposed project or these staff comments. However, the Board has previously expressed concern about the need for: (1) effective stormwater runoff management practices for all projects within the University Lake and Cane Creek watersheds; (2) effective, permanent sedimentation and erosion control measures; and (3) proper long-term operation, maintenance and inspection of on-site and cluster wastewater disposal systems in public water supply watersheds. Stormwater Runoff Controls The project would be located only about 0.75 miles from the upper end of the Price Creek arm of University Lake. During a typical rainfall event pollutant runoff from the site would reach the lake in a very short time (considerably less than 6 hours) . As reconunended under Triangle J Council of Governments guidelines, the project site should be considered within a water quality critical area. Additional water quality protection buffer , . area should be provided along Price Creek and the steeply-sloped drainageway that bisects much of the site (shown on the attached sketch) . The proposed 38-lot subdivision (revised from 41 lots) would have an average lot-size-of-approxtelyt2._6_acres_, with an overall development density of one unit per three acres. Based on preliminary informatlon developed-for the University Lake watershed study, an average lot size of one dwelling unit per two acres (assuming 6% impervious surface) throughout the watershed would result in degradation of the public water supply. Additional water quality protection measures will be needed if development occurs at a density of one unit per two acres and could be needed at lower development densities, such as that proposed for this project. It is recommended that consideration be given to requiring a wet pond or other suitable area-wide water quality protection measure for this project. A suggested general location for such a structure is shown on the attached marked-up plan. An Equal Opportunity Employer