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 Job Number 17,733 . Petroleum products such as fuel, oil and grease . Soil stabilizers and binders (e.g., Polyacrylamide) • Fertilizers, pesticides and herbicides . Detergents . Asphalt and concrete compounds ' . Hazardous chemicals such as acids, lime, adhesives, paints, solvents, and curing compounds . Any other material that may be detrimental if released to the environment ' Design and Installation Specifications The following steps should be taken to minimize risk: ' Temporary storage area should be located away from vehicular traffic, near the con- struction entrance(s), and away from waterways or storm drains. ' Material Safety Data Sheets (MSDS) should be supplied for all materials stored. Chemicals should be kept in their original labeled containers. . Hazardous material storage on -site should be minimized. ' Hazardous materials should be handled as infrequently as possible. . During the wet weather season (Oct 1 — April 30), consider storing materials in a covered area. . Materials should be stored in secondary containments, such as earthen dike, horse trough, or even a children's wading pool for non -reactive materials such as deter- gents, oil, grease, and paints. Small amounts of material may be secondarily con- tained in "bus boy" trays or concrete mixing trays. . Do not store chemicals, drums, or bagged materials directly on the ground. Place these items on a pallet and, when possible, and within secondary containment. . If drums must be kept uncovered, store them at a slight angle to reduce ponding of rainwater on the lids to reduce corrosion. Domed plastic covers are inexpensive and snap to the top of drums, preventing water from collecting. Material Storage Areas and Secondary Containment Practices: . Liquids, petroleum products, and substances listed in 40 CFR Parts 110,117, or 302 shall be stored in approved containers and drums and shall not be overfilled. Containers and drums shall be stored in temporary secondary containment facil- ities. . Temporary secondary containment facilities shall provide for a spill containment 2014 Stormwater Management Manual for Westem Washington Volume 9 - Chapter 4 - Page 316 SITTS & HILL ENGINEERS, INC. 47 TACOMA, WASHiNGTON