| Temporary erosion control planning and stormwater detention and treatment were a unique challenge for the nearly 90-acre Quarry reclamation in Clackamas County, Oregon. The defunct aggregate mine was being reclaimed per requirements enforced by the State of Oregon Department of Geology and Mineral Industries. The Clackamas River has approximately 2400 lf of frontage abutting the west edge of the property and Rock Creek runs along the entire north edge of the property as it tumbles into the Clackamas. With DOGAMI in authority on the reclamation plan, simp.L had to coordinate with numerous County, State, and Federal agencies to permit and co-manage this 2-year mass grading operation. simp.L worked with DOGAMI, the County, the landowner, the former quarry operator, the developer, WES, and numerous State & Federal agencies with jurisdictional authority over the two adjacent waterways. Along with a large and diverse team of land based consultants simp.L managed to develop innovative erosion control & temporary facilities that could be staged & phased as mass grading operations proceeded for a period of nearly 3 years. Combinations of sediment ponds, fabric lined and straw waddled dikes channeled storm water off of exposed surfaces while specially engineered seed mixes were used for quick germination and rapid root mass establishment for areas not actively being graded. Silt fencing, protected and controlled surface flows while large tanks stored water and removed dissolved solids. |
