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1 Washington <br />Department of HYDRAULIC PROJECT APPROVAL <br />FISH and RCW 77.55.021 (AG) - Appeal to Hyraulic Appeals Board <br />WILDLIFE RCW 77.55.021 - Appeal pursuant to Chapter 34.05 <br />Issue Date: December 31, 2007 Control Number: <br />Project Expiration Date: August 31, 2008 <br />FPA/Public Notice #: <br />South Central <br />1701 South 24th Avenue <br />Yakima, WA 98902-5720 <br />(509) 575-2740 <br />111603-1 <br />N/A <br />project sites prior to the start of project activities in order to.determine presence and proximity of <br />Coho salmon redds. If redds are found to be present near the site, the project may need to modify <br />cofferdam construction to ensure no loss of sediment or other deleterious materials, or if the redds <br />are in close proximity to the project site, the project will not initiate until spawning is completed. <br />7. Removal of the old diversion structures and associated fill shall be done in the least disturbing <br />manner to existing vegetation along the stream bank. <br />8. The stream banks shall be pulled back so that they gradually transition from the uplands to the <br />streambed, in order to ensure adequate conveyance of flow and debris during flood events and to <br />aid in the successful restoration of the bank. The re-contoured slopes shall be no greater than 3:1 <br />and should also transition gradually from existing vegetation and upstream/downstream slopes. <br />Extreme care shall be taken to avoid impacting existing stream bank vegetation upstream and <br />downstream of the project site. <br />WORKSITE AND -EQUIPMENT LIMITATIONS <br />9. All in -channel work shall be done during a period of low stream flow.. If stream flows increase <br />with fall precipitation, and the coffer dam appears likely to fail, the worksite shall be secured to <br />minimize sediment plumes and other undesirable impacts and work shall only proceed once flows <br />have subsided. <br />10. Equipment shall work from the bank. No stream crossings are currently Equipment shall be <br />maintained in good working conditions such that petroleum products or other harmful chemicals are <br />not leaked into the creek or its banks or bed. <br />11. Equipment may work below the ordinary high water mark (OHWM) once the cofferdam is in <br />place. This equipment shall be washed and clean of accumulations of earth and petroleum <br />products prior to entering the channel. <br />12. An excavator or trackhoe equipped with a ?thumb?, or an equivalent piece of machinery, shall <br />be available to remove old concrete block or riprap placed around the diversion structure. <br />13. The equipment operator shall have a spill containment kit onsite at all times in case equipment <br />or associated fuel, hydraulic fluids or other toxic chemicals are spilled. <br />14. Re -fueling of vehicles or maintenance operations of vehicles shall only occur at an upland site at <br />least 100 ft from the top of the stream bank. <br />WORK AREA ISOLATION AND TEMPORARY STREAM BYPASS <br />15. The diversion removal shall be done in isolation from the flowing water of the creek using a <br />temporary stream bypass around the work site. Structures used to divert or contain'flow or isolate <br />the work area shall be made of clean materials such as sand bags, pre -cast concrete ?ecology <br />blocks?, washed ?stream gravel?, plastic sheeting, etc.). The bypass will divert the flow of the <br />creek to the opposite side of the diversion, while the first half of the.diversion is removed. <br />Page 2 of 8 <br />