905 80TH ST SW MTORRES AMERICA 2018-09-18

Department of Engineering and Public Services and/or agencies with jurisdiction. Measures may include, but not be limited to, placing plywood across the area where equipment will operate; mulching the wetland areas where equipment will operate; placing wood chips atop a flexible mat to help prevent compaction (the wood chips and mat must be removed following construction); placing silt fences and hay bales between construction areas and all adjacent wetlands and streams; and placingecologyblocks between construction areas and streams or wetlands when a temporary fill is used for roads, etc. • Erosion 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. • Any excavation materials must be placed inan upland area during construction. Wetland soils must be in separate piles from upland soils. After construction,wetland soils should be returned to the wetland and upland soils placed in upland areas. At a minimum, the top 18 inches of topsoils from wetland areas shall be stored separately from the rest of the soils and replaced as the top layer of fill in the wetlands following construction. Care must be taken not to make"dams"from compacted fill that would alter any subsurface flow. • If a pipe is being trenched through the area,measures shall be taken to prevent the de- _ watering of the wetland(e.g. cut off collars, etc.). • When operating machinery in or near water, extreme care shall be taken to prevent any petroleum products,cement, chemicals, or other toxic or deleterious materials from entering the water. If a spill does occur, work shall be stopped immediately and Ecology's Spill Response Section contacted. • Equipment maintenance shall not occur in or adjacent to wetlands and streams. • Whenever feasible, if wetland plant species are not invasive, they should be removed prior to construction and placed aside in a shady damp location, such as under wet burlap sacks. Following construction, they should be replaced in the wetland area. • Revegetation: At a minimum, erosion control revegetation is required in all cleared areas and should include herbaceous ground cover that does not interfere with establishment of native vegetation. If long-term revegetation is required, it should be accomplished during the next most favorable time of year for the particular vegetation to ensure the highest level of success. (Note: If revegetation does not occur immediately following recontouring of the site, adequate erosion control measures must be taken.) Native.species compatible with preconstruction vegetation patterns shall be used for revegetation. Degraded emergent sites, such as Reed canary grass fields, shall be replanted with species thatare representative of a higher quality emergent, scrub-shrub or forested wetland. If revegetation is required, monitoring should occur once a year for a minimum of two years. 2. Pre-construction conferences must be held with the Planning Department, Public Works inspector and site development manager on sites containing environmentally sensitive areas in order to ensure that all development standards are understood. I