3003 W CASINO RD 1992 SITE DEV 2018-01-01 MF Import

IDRAFT the U.S. No. 200 sieve) increases, the soil becomes increasingly sensitive to small changes in moisture content and adequate compaction becomes more difficult or impossible to achieve, particulazly during wet weather. Generally, soils containing more than about 5 percent fines by weight cannot be propedy compacted when the moisNro content is more than a few percent from optimum. We recommend using a well-graded sand or sand and gravel mizture with iess than 5 percent paasing the U.S. No. 200 sieve basod on the fraaion passing the 3/4-inch sieve if earthwork operations are conduaed during wet weather, EROSION CONTROL MEASURES In addition to measures for earthworr placement, convol measures must also be implemented to mitigate erosion ha:ard areaz and prevent sediment transport onW undeveloped aceas. The potential sources or causes of erosion depend oo many factors including construction methods, ground configuration (i.e., slope length and gradient, amount of ezposure, etc.), soil type, construction sequencing and weather. In regard to development of the central area, the west, eazt end south sides will be surrounded by other developed areac, The north boundary will remain undeveloped. Preventive erosion control measures ihat should be implemented in the developed area include minimizing the area of site disturbance, using vacked equipment to minimize rutting, removing atanding surface water, site grading W avoid concentration of sur(ace water runoff onto or off of cut or fill slopes and natural slopes, and providing a blanket protection on finished slopes. Preventive measures that should be implemented along the development boundary wi11 include installation of silt fences, straw bales, and other de��ices and tec6niques that will trap any silt and prevent it from moving off site. Temporary erosion control measures that may be used within the basic site grading include instaliatlon of the following: • Constructfon Entrance • A rock stabilized temporary ent�ance pad in accordance with City of Everett Standazd 2.5.2.9 and Standazd Plan 208 should be installed at alt entrances to the site. • Flter Fabric Fencxs - Filter fabric fences s6ould be installed per City of L-verett Design Standard Plan 205. The fabric should be Mirafi 140N or equivalent. • Straw Bale Dams - Straw bale dams should be installed per City of Everett Design Standard Plan 206. • Hydroseed and Mulching - Hydroseed and mulch disturbed areas that will be leh unworred for 30 days or more and all finished slopes in accordznce with City of Evereti Standard 2.4. • Brush Barriera - To retain sediment in smaller disturbed areas, brush barriers may be wnsWcted vansverse to the slope. The barrier,� should be made from clearing and grubbing residue. � C e o E o ; i n e e r � 6 Fle No.0IZ0.1t0-R10� +'+ 06__92