1001 N BROADWAY EVCC 2025-10-03 - Laserfiche WebLink

i control fabrics and matting, soil application of polyacrylamide (PAM),the early application of gravel base on areas to be paved, and dust control. b. The Permittee must control stormwater volume and velocity within the site to minimize soil erosion. c. The Permittee must control stormwater discharges, including both peak flow rates and total stormwater volume,to minimize erosion at outlets and to minimize downstream channel and stream bank erosion. id. Depending on the geographic location of the project,the Permittee must not allow soils to remain exposed and unworked for more than the time periods set forth below to prevent erosion. r West of the Cascade Mountains Crest During the dry season (May 1-September 30): 7 days During the wet season (October 1-April 30): 2 days I i East of the Cascade Mountains Crest, except for Central Basin* During the dry season (July 1-September 30): 10 days During the wet season (October 1-June 30): 5 days The Central Basin*, East of the Cascade Mountains Crest During the dry Season (July 1 -September 30): 30 days k During the wet season (October 1-June 30): 15 days *Note:The Central Basin is defined as the portions of Eastern Washington ? G with mean annual precipitation of less than 12 inches. e. The Permittee must stabilize soils at the end of the shift before a holiday or s i weekend if needed based on the weather forecast. t I f. The Permittee must stabilize soil stockpiles from erosion, protected with sediment i = trapping measures, and where possible, be located away from storm drain inlets, waterways, and drainage channels. i The Permittee must minimize the amount of soil exposed during construction activity. g• p g Y• r h. The Permittee must minimize the disturbance of steep slopes. r i. The Permittee must minimize soil compaction and, unless infeasible, preserve topsoil. 6. Protect Slopes a. The Permittee must design and construct cut-and-fill slopes in a manner to minimize I erosion.Applicable practices include, but are not limited to, reducing continuous length of slope with terracing and diversions, reducing slope steepness, and roughening slope surfaces (for example,track walking). b. The Permittee must divert off-site stormwater(run-on) or groundwater away from slopes and disturbed areas with interceptor dikes, pipes, and/or swales. Off-site stormwater should be managed separately from stormwater generated on the site. C. At the top of slopes, collect drainage in pipe slope drains or protected channels to 5 prevent erosion. t Construction Stormwater Genera[Permit Page 27