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5( <br />CONDITION ELEVEN -EROSION CONTROL/GRADING (Formerly listed under Section 2-3-1 <br />('n of Staff recommended conditions -June 3, 2008 BOCC abstract -Attachment 3A) <br />11. In addition to any and all applicable local or State requirements, the following specific standards <br />shall govern erosion control and grading issues for this project: <br />a. The developer shall cause a formal Erosion Control Plan (ECP) to be prepared and submitted for <br />review and approval by the County Erosion Control Department prior to the commencement of <br />any earth disturbing activities, <br />b. State of the art skimmer basins designed to meet or exceed the requirements in the North Carolina <br />Erosion and Sediment Control Planning and Design Manual (July 2006) must be utilized to <br />control sedimentation during construction. <br />i. Floating skimmers, such as Faircloth skimmers or equivalent, must be utilized in each basin. <br />ii. Skimmers must dewater from the surface within 24 to 72 hours, and the orifice size of the <br />skimmer must be correctly sized to obtain the appropriate discharge rate. <br />iii. Supporting engineering calculations will be submitted with the erosion control plan. <br />c. Compliance with erosion control requirements will be performance based. The developer will <br />install and maintain devices to adequately maintain. sediment on-site. Additional controls will be <br />required if ofF site sedimentation occurs, even if the site is in compliance with the approved plan, <br />d. The developer shall collaborate with County staff during the erosion control plan design process. <br />To encourage this, a minimum of one (1)pre-application meeting with erosion control staff will be <br />conducted prior to submittal of the ECP, and apre-construction conference will be conducted prior <br />to land disturbance activities, <br />e. The developer shall adhere to the maximum slope grading standards of 3:1 per Orange County <br />regulations. <br />Tn cases where a different slope is required to adhere to other local and State requirement, most <br />notably NC DOT driveway access requirements, or a flatter slope is deemed more viable to avoid <br />the wholesale grading of the property or removal of significant vegetation, the developer has the <br />ability to observe a maximum slope ratio of 2:1 so long as: <br />i. The developer can demonstrate on a formally submitted site plan as well as within the <br />grading plan that the reduction will be compliant with the County grading and erosion <br />control standards and will not create unnecessary interior, or off-site, impacts <br />ii. That adherence to the established 3:1 slope standard will require excessive grading of the <br />property, <br />iii. That adherence to the established 3:1 slope standards will result in higher velocity <br />stormwater runoff, <br />f. The developer shall ensure that any grading activity will be conducted in such a manner that <br />existing vegetation, identified as being located within protected buffer areas, will be preserved <br />and maintained on the property <br />g. The developer shall utilize the natural shape of the land with minimal grading to locate features in <br />a way that minimize impacts on and off the site. <br />h. The developer shall adhere to NC DOT maxinnum slope standards for driveways and access <br />drives of a two percent (2%) minimum to a twelve percent (12%) maximum slope where it can be <br />