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Washington <br />Department of <br />' FISH and <br />WILDLIFE <br />HYDRAULIC PROJECT APPROVAL <br />RCW 77.55.021 (AG) - Appeal to Hyraulic Appeals Board <br />RCW 77.55.021 - Appeal pursuant to Chapter 34.05 <br />Issue Date: December 31, 2007 <br />Project Expiration Date: August 31, 2008 <br />Control Number: <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 />26. A bed of washed, rounded, streambed gravel shall be placed over all disturbed streambed areas <br />within the work area to a depth of six (6) inches. Streambed gravel shall be Well. mixed gravel <br />ranging in size from 0.25 inches to 5.0 inches (see attached typical specification). <br />27. Wastewater from project activities and de -watering of the work area shall be routed to an upland <br />location to allow removal of fine sediment and other contaminants. Care shall be taken to ensure <br />that fine sediment or other harmful materials is discharged to the creek. <br />DROP STRUCTURE CONSTRUCTION AT SITE #2 <br />28. The grade control shall be constructed in isolation from the flowing water of the creek to the <br />fullest extent possible. <br />29. Two, Reichmuth-style control weirs may be constructed at Site #2, so as to pool water and <br />ensure unimpeded fish passage through the creek. Construction of two upstream "v" shaped weir is <br />authorized. The water surface elevation drop across the weir shall be less than 6 inches +/-. The <br />grade control weir shall be constructed in the creek as shown on the site plan, and in accordance <br />with Washington State Integrated Streambank Protection Guidelines for Drop Structures (WA State <br />Aquatic Habitat Guidelines Program, 2002, pp. 6-39 - 6-46). <br />30. Weirs shall be designed to allow upstream passage of fish. A scour pool shall be excavated <br />below the weir as necessary to ensure that fish have a "jump pool" water depth at least 1.25 times <br />the height of the low flow head differential across the weir. The voids in the rock weir shall be <br />sealed with suitable streambed gravels (with minimal silt and clay content) to ensure stream flow <br />will pour over the weir rather than percolate through it. If suitable streambed gravels are unavailable <br />on site, imported pit run or other suitable gravel aggregate shall be used. <br />31. The weirs shall be constructed of large, clean, angular rock of sufficient size to prevent them <br />from being washed away by 100 -year flows. The largest rocks shall be used on the downstream <br />face of the structure. The weisr shall be keyed into the bank to an elevation above the high flow <br />line. The downstream face of the weir shall be oriented at an upstream angle so as to form a "V", <br />which concentrates flow energy in the center of the channel. <br />32. If excavation is necessary for placement of a rock, the excavated hole shall be only large <br />enough and deep enough to accept the rock and maintain surface grade. Excavated material shall <br />be gently placed on upstream side of structure. <br />33. Rocks shall be placed individually by use of a backhoe with a thumb or other suitable grapple <br />device. Each rock shall be set in place in essentially the final position. <br />34. Work shall avoid damage to existing woody vegetation.. <br />SITE RESTORATION <br />35. All earth areas adjacent to the watercourse which have been disturbed by this project are to be <br />seeded with a suitable erosion control seed mix and protected from erosion with a commercial <br />erosion control blanket or approved equivalent. <br />Page 4 of 8 <br />