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

I 1 Section 2-02.3 is supplemented with the following: i3 (******) 4 Removal and Disposal of Hazardous Material I 5 Hazardous materials may exist within the limits of work, though specific limits of 6 contamination are not identified in the Plans. Refer to Appendices for additional reports and 7 information on site history, prior studies, and/or test results. I 8 9 All necessary permits for this work will be furnished by the Contracting Agency. The 10 Contractor is responsible for all work, records, and reports required to perform the work Ii 1 12 described in this section. The Contracting Agency will perform all testing of suspected hazardous or contaminated material. 13 14 The Contractor shall notify the Engineer immediately if contamination is discovered or is I15 suspected through observations such as an oily sheen or discolored soils that may or may 16 not emit strong chemical odors. 17 18 Contaminated Soil and Hazardous Material 19 The Engineer will determine the limits of excavation required. All material that is 20 designated by the Engineer to be removed shall be handled and stored in a manner that I 21 prevents the spread of contamination to adjacent soil or water. Separate stockpiles shall 22 be maintained for known hazardous or contaminated material and for suspected hazardous 23 or contaminated material. The Contractor shall transport hazardous or contaminated I 24 material and dispose of it at a permitted facility. The Contractor shall provide the Engineer 25 with a copy of the shipping manifest or bill of lading indicating the amount of material 26 hauled to disposal, and bearing the disposal site operator's confirmation for receipt of the I 27 material. 28 29 Contaminated Water I 30 All water that is removed from the areas of contamination, including free water that leaches 31 from contaminated soil stockpiles or water that is suspected of being contaminated, shall 32 be collected, handled and stored in a manner that prevents the spread of contamination to 33 adjacent soil or water. The Contractor shall transport contaminated water and dispose of it I34 at a permitted facility. The Contractor shall provide the Engineer with a copy of the shipping 35 manifest or bill of lading indicating the amount of material hauled to disposal, and bearing 36 the disposal site operator's confirmation for receipt of the material. I37 38 (******) 39 Section 2-02.3(4) Creosote Removal Plan I 40 Contractor shall follow Washington Department of Natural Resources Best 41 Management Practices for Pile Removal & Disposal (refer to Appendices) to the 42 extent practicable. The Contractor shall provide a Creosote Removal Plan that I 43 describes the sequence, means, and methods proposed to remove portions of the 44 train trestle and piles. 45 The plan shall include the following: I 46 • Site access and material stockpile techniques. 47 • Proposed extraction technique. Vibratory extraction method is required 48 where feasible. I 49 • Proposed BMPs to capture debris in water and address 50 resuspension/turbidity. 51 • Methods to contain any sawdust from cutting treated lumber. I52 • Proposed transport approach and disposal site. IRIVERFRONT DEVELOPMENT NORTH WETLAND COMPLEX 101