Agenda - 08-30-2011 - 1b - Laserfiche WebLink

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Regional Nutrient Management Rules ~ ~ August 2011 C. Jordan Lake Stage I tmplications The Stage I Existing Development Stormwater Program prepared and submitted by Orange County has been approved by the EMC and implementation by the County began_August 2010. Staff estimates that full implementation of the Stage I Existing Development Stormwater Program wial require approximately 1-,200 man hours annually. As a result, staff is evaluating the feasibility of the County rejoining the Clean Water Education Partnership (CWEP). CWE.P members obtain credit toward at least a portion ofi the public education program required by the Jordan Rules. D. -FaNs Lake S-cage i-Implications Local governments will use the information listed above to deter-mine the 2006 baseline nutrientloading levels in-addition to the amount of current loading. The difference between the two levels will determine the amount of nutrient reduction that must be achieved during Stage I of the-Rules (by 2020). Alternatively, DWQ provides -local governments the option- of assuming uniform pre-development-loading rates of 2.89 Ibs/acre/yr N and 0:63 Ibs/acre/yr P for existing developed lands. If the analysis of existing developed lands in the watershed, which must be completed by County staff, demonstrates that the averages concentration-of nutrients in the runoff generated by developed lands in the County is less than these threshold- values, the-County well have met the Stage I reduction goal for existing developed lands. Initial estimates completed by staff indicate that the County- may be below these threshold values. However, final calculation of these values will not be possible until the North Carolina Nutrient Scientific Advisory Board issues the necessary accounting took for Falls Lake. This Board has already developed a separate accounting tool for calculating nutrient concentrations in runoff from new development. Until loading rates from existing developed lands can be determined, it is not possible to estimate the potential cost for complying with these regulations_ At this time, it is known that County staff hours will be needed to collect and analyze the required data. Staff will also have to develop recommendations for meeting the required nutrient-reductions, possibly through the installation of stormwater retrofits. A survey of failing acrd operating septic systems must also be undertaken by staff for the portion of the County in the Falls Lake watershed. E. Jordan Lake Stage II Requirements If the Existing Development measures implemented in Stage I do not reduce water quality violations in each arm of Jordan Lake adequately, then Stage II Existing Development Programs must. be developed according to the following schedule: • If the water quality monitoring indicates continued impairment of the Upper New Hope arm in the March 2014 report, then upstream communities, including Orange County, must prepare a Stage II Existing Development Stormwater Program. If needed, the Stage II Program for the Upper New Hope Creek sub-