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17 <br /> 1 amount (loading) of nutrients entering Falls Lake, so a stream that contains a low concentration <br /> 2 of nutrients (such as Eno River) could actually contribute more nutrient loading if its streamflow <br /> 3 was significantly larger than a second stream with a higher concentration of nutrients (such as <br /> 4 Ellerbe Creek). <br /> 5 <br /> 6 CardnoEntrix is also collecting data for the following Special Studies as part of the Falls Rules <br /> 7 re-examination process: <br /> 8 • Falls Lake Constriction Point Monitoring <br /> 9 • High Flow Monitoring <br /> 10 • Storm Event Sampling <br /> 11 • Sediment Sample Analysis <br /> 12 • Light Penetration Analysis <br /> 13 • Volatile Suspended Sediment Determination <br /> 14 • Survey of Recreational Use of Falls Lake <br /> 15 • Model Performance Evaluation <br /> 16 • Evaluation of Regulatory Options to Falls Lake Rules <br /> 17 <br /> 18 Project Outcomes <br /> 19 Determine sources of nutrients. <br /> 20 Quantify nutrient loading entering the lake <br /> 21 Examine nutrient related processes in the lake. <br /> 22 New data will be used in lake and water-shed re-modeling <br /> 23 Goal — more appropriate, achievable Stage II nutrient reduction goals <br /> 24 <br /> 25 Commissioner Dorosin asked if there is a specific party responsible for determining the <br /> 26 rules. <br /> 27 Tom Davis said the legislature passed the enabling legislation, and the rules were <br /> 28 enacted in 2011. He said the Division of Water Resources (DWR) is the body that wrote the <br /> 29 rules. <br /> 30 Commissioner Dorosin asked if the intent is to gather the data and provide it to the <br /> 31 DWR so that the rules can be revised. <br /> 32 Tom Davis said yes. <br /> 33 <br /> 34 2. BMP Nutrient Credit Development <br /> 35 CardnoEntrix is continuing to work on a project to develop nutrient reduction Best Management <br /> 36 Practice (BMP) credits. The project will be beneficial to UNRBA member governments <br /> 37 (including Orange County) by increasing the number of structural devices and other stormwater <br /> 38 practices with known nutrient reduction values. These BMPs will then be available for affected <br /> 39 parties to use to meet the required nutrient reduction goals under Stages I and II of the Falls <br /> 40 Lake Rules. This is sometime referred to as increasing the number of nutrient reduction <br /> 41 measures available in the "BMP tool box". Subject matter experts are developing nutrient credit <br /> 42 values and practice standards for three "batches" of BMPs: <br /> 43 <br /> 44 BMP Batch 1: Infiltration Devices <br /> 45 Filter Strips <br /> 46 Soil Amendment <br /> 47 <br /> 48 BMP Batch 2: Bioretention Devices <br /> 49 Land Conservation <br /> 50 Pervious Area Nutrient Management <br />