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export amounts to 3.6 lbs/ac/yr.. <br />(2) Pay aone-time offset payment-ef-X33©N{~. This offset <br />fee will go to the~etlarrcls-Iieste~atien-I§-egr-nrn-(~VItt'-) <br />North Carolina Ecosystem Enhancement Program <br />NCEEP .The WRI'- NCEEP will utilize these fees in <br />accordance with the Basinwide Wetlands and Riparian <br />Restoration plans. It is the policy of the ~1~1? NCEEP to <br />utilize the funds where they are generated to the maximum <br />extent possible. <br />(.3) A combination of BMPs and offset payments maybe <br />used to achieve.3.6 Ibs/ac/yr. <br />b) If the calculated export is greater than 10.0 lbs/ac/yr, the owner <br />must use BMPs to lower the nitrogen export to 10.01bs/ac/yr. The <br />owner may then use one of the above options to achieve a nitrogen <br />export level of.3.61bs/ac/yr. <br />D. Calculating Peak Runoff Volume <br />For all new development, there shall be no net increase in peak flow leaving the <br />site from the predevelopment conditions for the 1 year, 24 hour storm, <br />1. The following are acceptable methodologies for computing the pre- <br />andpost- development conditions for the 1 year, 24 hour storm.. <br />a) Rational Method <br />b) Peak Discharge Method as described in the USDA Soil <br />Conservation Service's Technical Release Number 55 (TR-55). <br />c) Putnam Method <br />d) Alternative methods must be approved by the County and the <br />EMC <br />2. The same method must be used for both the pre- and post- <br />development conditions. <br />Raleigh Rainfall Depths <br />a) 1 year, 24 hour depth: 3.00 inches <br />b) 1 year, 24 hour intensity: under development by DWQ staff <br />E. Exemptions to the Peak Flow Requirements <br />Peak flow requirements are waived for development that meets the following <br />criteria: <br />1. Increase in peak flow between pre- and post- development conditions <br />does not exceed 10% (ten percent). <br />2. Proposed new development meets all of the following criteria: <br />a) total impervious surface is less than 15% (fifteen percent), and <br />b) remaining pervious surface maximizes storrnwater runoff <br />control and conveyance.. <br />3. Detention will cause further flooding on lands that have experience <br />