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Draft Eastern Kashington Phase 11 Municipal Stornmti ester Permit <br />• Flocculants for the pretreatment of catch basin decant liquids must be non-toxic <br />under the circumstances of use and must be approved in advance by the Department <br />of Ecology. <br />The reasonable availability of sanitary sewer discharge will be determined by the <br />Permittee, by evaluating such factors as distance, time of travel, load restrictions, and <br />capacity of the stormwater treatment facility. <br />3. Water removed from stormwater ponds, vaults and oversized catch basins may <br />be returned to the storm sewer system. Stormwater ponds, vaults and oversized catch <br />basins contain substantial amounts of liquid, which hampers the collection of solids and <br />pose problems if the removed waste must be hauled away from the site. Water <br />removed from these facilities may be discharged back into the pond, vault or catch <br />basin provided: <br />• Clear water removed from a stormwater treatment structure may be discharged <br />directly to a down gradient cell of a treatment pond or into the MS4. <br />• Turbid water may be discharged back into the structure it was removed from if <br />the removed water has been stored in a clean container (eductor truck, Baker <br />tank or other appropriate container used specifically for handling stormwater or <br />clean water); and <br />- there will be no discharge from the treatment structure for at least 24 hours. <br />The discharge must be approved by the storm sewer system owner/operator. <br />Street Waste Solids <br />Soils generated from maintenance of the MS4 may be reclaimed, recycled or reused <br />when allowed by local codes and ordinances. Soils that are identified as contaminated <br />pursuant to Chapter 173-350 WAC shall be disposed at a qualified solid waste disposal <br />facility. <br />August 1, 2014 Appendix 6 — Street Waste Disposal Page 2 of 2 <br />