6600 MERRILL CREEK PKY BLDG A SHELL 2016-01-01 MF Import

Construction staging areas must bc located outside of environmentally sensitive areas and their buffers, unless determined by the Planning Director to be infeasible. Streams, wetlands, buffers, staging areas and conswction limits shall be clearly shown on construction plans. Construction limits shall be clearly marked in the field w�ith urange construction fencing. Work shall be done so as to minimize turbidity, erosion, and other water quality impacts. Pron�r erosion :�nd sediment control measures shall be followed to prevent sediments from entering crecks or wetlands. Erosion control mcasures shall be approved by the Department of Enginecring and Public Services znd%or agencies with jurisdiction. Measures may include, but not bc limited to, placing plywood across the area where equipment will operate; mulching the wetland areas where equipment �vill operate; placing�vood chips atop a (lexible mat h hclp prevent compaction (the wood chips and mat must be removed following construction); pl�cing silt fences and hay bales between construction areas and all adjacent wedands and streams; and placing ecology blocks behveen construction areas and streams or��eqands when a temporay fill is •�sed for roads, etc. Erosian control measures shall be in place and inspected prior to commencement of work. All erosion control structures shall be inspected regularly to ensure they are maintained in working order. t�tl�e corridor needs to be dewatcred to do the work, the water should be pumped to a sedimentation pond where all solids can setUe or an area where it can sheet flow before being discharged back to the stream or wetland. Turbidity levels in associated wetlands and streams shall not exceed the standards in WAC 173-201A. Any excavation materials must be placed in an upland area during construction. Wetland soils must be in separate piles from upland soils. A(ler construction, wedand soils should be retumed to thc wedand and uoland soils placed in upland areas. At a minimum, the top 18 inches of topsoils Gom wetland areas shall be stored separately Gom the rest of the soils and replaced as the top layer of fill in d�e �vetlands following construction. Care nmst be taken not to make "dams" from i:ompactcd fill that would alter any subsurtace flow. I f a pipe is being trenched through the azca, measums shall be taken to pre��ent the de-watering of liie wctland (e.g. cut off collars, etc.). When operating machinery in or near water, extremc care shall be taken to prevent any petroleum products, cetuent, chemicals, or oUier toxic or delcterious materials from entering the water. If a spill docs occur, work shall be stopped immcdiately and Ecology's Spill Response Section contacted. Equipment maintenance shall not occur in or adjacent to wedands and streams. ARcr construction, the site must be retumed to its original grades. Care must be taken to not drain wctlands or alter water flows or pattcros. s