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� <br /> ' SUGGESTED MITIGATING MEASURFS <br /> ' Several measures are proposed to mitigate the potrntial rnnstruction and long•term <br /> impacts to upland and wetland habitats. Construnion techniques and design features <br /> ' are includes in the project proposed to avoid and reduce impacts. A conceptual <br /> swale enhancement plan to compensate for impacts also is proposed. These <br /> mitigating measures are funher described below. <br /> ' Conslructian TecAniques <br /> ' The use of standard construction practices and erosion control features can reduce <br /> the patential for erosion and subsequent sedimentation in North Creek. 7'hese <br /> meazures rnuld inclodc conducting clearing and grading during the summer months, <br /> ' ercaing a sediment mntrol fena along all clearing lines, and providing temporary <br /> detention and hay bales in low-lying drainage areas and open utiliry trcnches for <br /> settling and trapping suspended sedimcnt. By implementing these measures, <br /> ' wnswction impacts can be climinated and/or rcduced. <br /> Design Fealures <br /> ' Two specific design teatures have been incorporated into the overall project master <br /> plan to redutt wetland impacts. These include the use of retaining walls along the <br /> ' south propeny line to limit the amou�t of fill to be placed in the �solated scrub- <br /> shrub wetland,and the use of a native growth buffer along the Nonh Creek stream <br /> corridor wetland. <br /> ' 'Ihe Washington Department of Wildlife has suggested that a 25•[oot buffer be <br /> maintained along the wetland boundary of the stream corridor. Due to ihe <br /> ' identified impaMs that are azsociated with the project, the project proponent has <br /> eleMed to incrcase the buffer width to 40 feet for panial compensahon for habitat <br /> impacts. The incroased buffer will preserve a mamrc semnd growth coniferous <br /> � forest of predominantly western red cedar. The buffer will provide additionai <br /> habitat benefiu to the North Creck stream wrridor that otherwise would not be <br /> maintained. Along the outer boundary of the proposed buffer,an enhanced drainage <br /> ' swale is proposed. <br /> The retaining wall strunure proposed along the southern properry line will reduce <br /> ' the overall impaa ta the isalated wetland by over 1,200 square feet (15%). The <br /> retaining wall also will allaw for the opportumty to rnnstruct an enhanced drainage <br /> swale. 71�e conceptual swale enhanczment plan is illustrated on the enclosed figure <br /> and described in more detail below. <br /> 1 <br /> I <br /> � <br /> ' <br />