2320 RAILWAY AVE INTERWEST CONSTRUCTION INC 2023-06-12

INTERWEST — EVERETT CONTRACTOR'S YARD INTERIM FILL PROJECT Sitts & Hill Engineers, Inc. CONSTRUCTION STORMWATER POLLUTION PREVENTION PLAN lob Number 17,733 volume able to contain 10% of the total enclosed container volume of all con- tainers, or 110% of the capacity of the largest container within its boundary, whichever is greater. . Secondary containment facilities shall be impervious to the materials stored therein for a minimum contact time of 72 hours. . Secondary containment facilities shall be maintained free of accumulated rain- water and spills. In the event of spills or leaks, accumulated rainwater and spills shall be collected and placed into drums. These liquids shall be handled as haz- ardous waste unless testing determines them to be non -hazardous. . Sufficient separation should be provided between stored containers to allow for spill cleanup and emergency response access. . During the wet weather season (Oct 1 — April 30), each secondary containment facility shall be covered during non working days, prior to and during rain events. . Keep material storage areas clean, organized and equipped with an ample supply of appropriate spill clean-up material (spill kit). . The spill kit should include, at a minimum: * 1-Water Resistant Nylon Bag * 3-Oil Absorbent Socks 3"x 4' 2-Oil Absorbent Socks 3"x 10' 12-Oil Absorbent Pads 17"xl9" 1-Pair Splash Resistant Goggles 4 3-Pair Nitrile Gloves * 10-Disposable Bags with Ties * Instructions BMP C154: Concrete Washout Area PurP Prevent or reduce charge of pollutants to stormwc, ducting washout off -site, or ing on -site was pollutants from entering surface wa water. Conditions of Use Concrete washy ea best management practices are :concrete waste by Ion- a designated area to prevent on construction 2014 Stormwater Management Manual for Westem Washington Volume If - Chapter 4 - Page 317 SITTS & HILL ENGINEERS, INC 48 TACOMA, WASHINGTON