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d) The proposed use within the Water Quality Management Area is a portion (525 square feet) of an <br />existing single family residence. The proposed encroachment impacts the water quality function <br />rating system of the pre -proposal conditions by reducing the water quality management area from <br />a rating of "5" to a "3." Refer to the Water Quality Function Rating Table. <br />e) The proposed use will impact the Pollutant Filtration, Erosion Prevention, Channel Shading <br />function by eliminating 525 square feet of vegetation within the Water Quality Management Area <br />resulting in a reduced rating from 5 to 4. <br />f) Measures proposed to mitigate the adjustment impact are shown on Site Plan II and are applied to <br />the "Bed and Bank Stability" function where 20% of the channel bed and banks will be repaired <br />including 3 grade control features and bioengineering measures including willow fascines along <br />toe of bank and willow stakes on the bank spaced t feet on center (96 stakes total). These <br />measures will improve Bed and Bank Stability rating from 2 to 5. <br />2.3 Water Quality Function Rating Table. The following table documents the individual and overall <br />water quality function conditions under pre -proposal (total score 12), post -proposal without mitigation <br />(total score 9), and post -proposal with mitigation conditions (total score 12). <br />Water Qua <br />ity Function Rating Table <br />Pre -Proposal <br />Post -Proposal <br />Post -Proposal <br />Net Change <br />Water Quality <br />Points <br />without <br />with Mitigation <br />from Pre - <br />Function <br />(1-5) <br />Mitigation <br />Points <br />Proposal to <br />Points <br />(1-5) <br />Post -Proposal <br />(1-5) <br />Points <br />Water Quality <br />5 <br />3 <br />3 <br />-2 <br />Management Area <br />Pollutant Filtration, <br />5 <br />4 <br />4 <br />-1 <br />Erosion Prevention, <br />Shading* <br />Streambed and <br />2 <br />2 <br />5 <br />+3 <br />Streambank Stability <br />Total <br />12 <br />9 <br />12 <br />0 <br />As shown in the table above and reflected on Site Plan II, it is hereby certified that the water quality <br />function rating under post -proposal conditions with mitigation measures will be equal to pre -proposal <br />conditions. <br />(signature, date, and stamp of certified preparer) <br />