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1 <br />Experience gained at several projects in the City of Redmond has shown that the alka- <br />linity needs to be at least 50 mg/L to prevent a drop in pH to below 6.5 when the polymer <br />is added. <br />2014 Stormwater Management Manual for Westem Washington <br />1 <br />1 <br />11 <br />1 <br />1 <br />n <br />L! <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />IJ <br />Volume // - Appendix B - Page 422 <br />1 <br />