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• Small Area Exemption #2, #3, #4. <br />Small Area Exemption #2, #3, #4 are planned for the amendment area. These are <br />shown on Map 2.05.3-12 and are located on the westernmost portion of the permit area <br />where the terrain is undulating and these areas cannot be made to drain to any <br />sediment pond. The areas are 2.1 acres, 2.6 acres and 0.9 acres, respectively. The <br />alternative sediment control measures for these areas consist of earthen berms of <br />2H:1V sideslopes with a minimum top height of 3.0 feet installed at the bottom of the <br />exemption area to channel the runoff into a 30' wide gravel berm section with filter <br />fabric. This section will be installed in the lowest 30' section of the exemption area and <br />will serve to filter sediment out before gradually releasing the water through the gravel <br />embankment. A schematic of this installation is shown on the following page. The filter <br />fabric to be used is Mirafi Filterweave UV fabric or equivalent. The gravel embankment <br />will consist of minus 3" durable rock. A portion of the filter will be buried below the <br />embankment as shown and a height of 2.0 feet above the filter will be used to handle <br />very large events. <br />• <br /> <br />(REVISED 12100) Attachment 2.05.3(3)-11- 4 <br />