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r <br /> Subsurface ErpfomHon. Gtolagic Nazard. and <br /> ' Having Nop�f'hase!I Prdimimry Ceaechntcal Engtnrntng Report <br /> E�rrett. 11'arhingion Ctologic Haxards ad MlNgatlont <br /> I7.0 EROSION HAZARDS AND MTTIGATION <br /> To mirigace and reduce the erosion hazazd poteatial and off-site soil transport, we recommend <br /> � the foliowing: <br /> 1. Atl sto�m water from impermeable surface: should be tightlined into approved storm <br /> � wat�r drainaga systems or temporary storage. <br /> 2. To reduce the amount of soil transport, silt feoces should be placed along the lower <br /> ' tlevations of the site. <br /> ' 3. Temporary cut slcpes for retaiaing wall conswction along the western site margins <br /> should only be constnicted during the dry summer months. Cuts should be designed <br /> such that a 1.SH:1 V line extending from th� base of the adjacent building footings dces <br /> no� daylight wi.hin the cut. The cut should be protected from erosion by covering it <br /> � with clear plastic sheeting. No water should be allowed to flow over the slope cut face <br /> or sarurate the soils at the crest of the slope. Building foundation and related <br /> � conscruction should also proceed during the drier periods of the year, if possible, nr <br /> temporary erosion and sediment control plans sho�ld be developed if construction is to <br /> proceed during the wincer months. Disturbed sreas shou(d be revegetated as soon as <br /> � pos�ible. <br /> 4. Soils that are to be reused around the site should be stored in such a manner as to <br /> ( reduce erosion. Protective measures may include, but are not ne�essarily limited to, <br /> � coverin� with plastic sheeting or the use of hay bales/silt fences. <br /> l <br /> i <br /> ! <br /> I <br /> 1 <br /> I <br /> � Fetrruaryll, ?002 ASSOCIATEDF.IR7NSClENCES, INC. <br /> SGllrtd�KE01 N9A:-Pro�rmiJYl!iJ9'KFWP-W� Page 8 <br /> ( �.N <br />