1710 W MARINE VIEW DR 2024-01-03

silt loam, sandy clay loam, and day loam). Avoid areas of natural ground water recharge. . Stripping shall be confined to the immediate construction area. A 4-inch to 6-inch stripping depth is common, but depth may vary depending on the particular soil. All surface runoff con- trol structures shall be in place prior to stripping. • Do not place topsoil while in a frozen or muddy condition, when the subgrade is excessively wet, or when conditions exist that may otherwise be detrimental to proper grading or pro- posed sodding or seeding. . In any areas requiring grading, remove and stockpile the duff layer and topsoil on site in a des- ignated, controlled area, not adjacent to public resources and critical areas. Reapply stock- piled topsoil to other portions of the site where feasible. . Locate the topsoil stockpile so that it meets specifications and does not interfere with work on the site. It may be possible to locate more than one pile in proximity to areas where topsoil will be used. . Stockpiling of topsoil shall occur in the following manner: o Side slopes of the stockpile shall not exceed 2H:1 V. o Between October 1 and April 30: ■ An interceptor dike with gravel outlet and silt fence shall surround all topsoil. ■ Within 2 days complete erosion control seeding, or covering stockpiles with dear plastic, or other mulching materials. o Between May 1 and September 30: ■ An interceptor dike with gravel outlet and silt fence shall surround all topsoil if the stockpile will remain in place for a longer period of time than active construction grading. ■ Within 7 days complete erosion control seeding, or covering stockpiles with clear plastic, or other mulching materials. . When native topsoil is to be stockpiled and reused the following should apply to ensure that the mycorrhizal bacterial, earthworms, and other beneficial organisms will not be destroyed: o Re -install topsoil within 4 to 6 weeks. o Do not allow the saturation of topsoil with water. o Do not use plastic covering. Maintenance Standards . Inspect stockpiles regularly, especially after large storm events. Stabilize any areas that have eroded. Establish soil quality and depth toward the end of construction and once established, protect from compaction, such as from large machinery use, and from erosion. 2019 Stormwater Management Manual for Western Washington Volume 11 - Chapter 3 - Page 303