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, Pacific Topsoils Riverside site—Stortn Drainage Report <br /> GFK Consutting Inc. <br /> 6 EROSION RISK ASSESMENT AND ABATEMENT <br /> 6.1 Slope <br /> Slopes on this site range from 0% to 2%. <br /> 6.2 Critical araas <br /> There are no critical areas onsite, however, the site is bounded to the East by the Snohomish <br /> River. <br /> 6.3 Soils <br /> Soils are Alderwood. Erosion risks for open, exposed material are slight and should be <br /> covered relatively quickly. <br /> 6.4 Ground movement <br /> There are no features on the site indicating a great potential for landslides or seismic events. <br /> 6.5 Sources of erosive waters <br /> Rainfall, landscaping irrigation are the only significant surface water sources.. <br /> 6.6 Measures proposed to minimize erosion <br /> Site improvement plans shall indicate temporary erosion control measures be implemented <br /> per DOE standards. <br /> 6.7 Nearest downstream waterbody <br /> Snohomish River. <br /> 6.8 Nearest fish bearing waters <br /> Snohomish River <br /> 6.9 Conclusion <br /> Because siopes are generally flat and the proposed excavation for this site is relatively light, <br /> with adequate erosion control measures there should be no problem controlling erosion <br /> during construction. <br /> 7 UPSTREAM ANALYSIS <br /> There is no appreciable upstream basin tributary to any of the proposed storm drainage <br /> systems. <br /> 8 DOWNSTREAM ANALY5IS <br /> Runoff leaves the site and flows directly into the Snohomish River. <br /> 8I10/2010 12 ( � ' <br /> C:\Project data\Project files\PTopsoiis Rlverside site\Reports\Riverside4.doc 1\ " �/�.' <br />