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<br />Conservation License (rev. 12/16) Page 19 of 23 License No. 23-108200 <br />ATTACHMENT 2 <br /> <br />Washington Department of Natural Resources Derelict Creosote Piling Removal <br />Best Management Practices For Pile Removal & Disposal <br /> <br />The following Best Management Practices (BMPs) are adapted from EPA guidance (2005), <br />Washington State Department of Transportation (WSDOT) methods and conservation activities as <br />included in Joint Aquatic Resources Protection Application (JARPA) 2005, and Washington State <br />Department of Resources (WADNR) “Standard Practice for the Use and Removal of Treated <br />Wood and Pilings on and from State-Owned Aquatic Lands” 2005, as well as WADNR’s practical <br />experience through managing piling removal projects since 2006. The purpose of these BMPs is <br />to control turbidity and sediments re-entering the water column during pile removal, and prescribe <br />debris capture and disposal of removed piles and debris. <br /> <br /> <br />BMP 1. PILE REMOVAL <br /> <br />Crane operator shall be experienced in pile removal. Piles will be removed slowly. This will <br />minimize turbidity in the water column as well as sediment disturbance. Pulled pile shall be placed <br />in a containment basin to capture any adhering sediment. This should be done immediately after <br />the pile is initially removed from the water. <br /> <br />A. Vibratory extraction: <br /> <br />1) This is the preferred method of pile removal. Vibratory extraction shall always be <br />employed first unless the pile is too decayed or short for the vibratory hammer to grip. <br />After consultation with WADNR, the alternative options listed below may be used. <br /> <br />2) The vibratory hammer is a large mechanical device (5-16 tons) that is suspended from a <br />crane by a cable. The hammer is activated to loosen the piling by vibrating as the piling is <br />pulled up. The hammer is shut off when the end of the piling reaches the mudline. Vibratory <br />extraction takes approximately 15 to 30 minutes per piling depending on piling length and <br />sediment condition. <br /> <br />3) Operator will “Wake up” pile to break up bond with sediment. <br /> <br />Vibrating breaks the skin friction bond between pile and soil. Bond breaking avoids pulling out a <br />large block of soil – possibly breaking off the pile in the process. Usually there is little or no <br />sediment attached to the skin of the pile during withdrawal. In some cases material may be attached <br />to the pile tip, in line with the pile. <br /> <br /> <br /> <br /> <br /> <br />Docusign Envelope ID: 9AF27A6B-A801-4DA1-8CF6-CC7F0385775B