A-1 Landscaping and Construction, Inc. 7/20/2016

I iWashington Department of Natural Resources Derelict Creosote Piling Removal ' Best Management Practices For Pile Removal & Disposal The following Best Management Practices (BMPs) are adapted from EPA guidance (2005), Washington State Department of Transportation (WSDOT) methods and conservation activities as included in Joint Aquatic Resources Protection Application (JARPA) 2005, and Washington State Department of Resources (WADNR) "Standard Practice for the Use and Removal of Treated Wood and Pilings on and from State-Owned Aquatic Lands" 2005, as well as WADNR's practical experience through managing piling removal projects since 2006. The purpose of these BMPs is to control turbidity and sediments re-entering the water column during pile removal, and prescribe debris capture and disposal of removed piles and debris. BMP 1. PILE REMOVAL Crane operator shall be experienced in pile removal. Piles will be removed slowly. This will ' minimize turbidity in the water column as well as sediment disturbance. Pulled pile shall be placed in a containment basin to capture any adhering sediment. This should be done immediately after the pile is initially removed from the water. A. Vibratory extraction 1) This is the preferred method of pile removal. Vibratory extraction shall always be employed first unless the pile is too decayed or short for the vibratory hammer to grip. 2) The vibratory hammer is a large mechanical device (5-16 tons) that is suspended from a crane by a cable. The hammer is activated to loosen the piling by vibrating as the piling is pulled up. The hammer is shut off when the end of the piling reaches the mudline. Vibratory extraction takes approximately 15 to 30 minutes per piling depending on piling length and sediment condition. 3) Operator will "Wake up"pile to break up bond with sediment. • Vibrating breaks the skin friction bond between pile and soil. • Bond breaking avoids pulling out a large block of soil—possibly breaking off the pile in the process. • Usually there is little or no sediment attached to the skin of the pile during withdrawal. In some cases material may be attached to the pile tip, in line with the pile. B. Direct Pull 1) This method is optional if the contractor determines it to be appropriate for the substrate type, pile length, and structural integrity of the piling. Vibratory extractor must be attempted ' first unless there is risk of greater disturbance of sediments. I 1 Updated 3/19/2013 I