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Spokane River - Upriver Dam PCBs Sediments Site
SITE BACKGROUNDThe Upriver Dam PCBs Sediments Site is divided into two projects. Upriver Dam, identified as Deposit 1, begins directly behind Upriver Dam in the city of Spokane and continues east for approximately 3.6 acres. Donkey Island, identified as Deposit 2, is a small 0.25-acre area near Donkey Island in an unincorporated area. Sediments at both project locations are contaminated with Polychlorinated Biphenyls (PCBs).Cleanup was necessary because:
Upriver Dam PCB Sediment Site Cleaned Up 2006
Placing the Cap Behind Upriver Dam
The dam is located along Upriver Drive east of Greene Street. The project begins directly behind the dam and stretches east for nearly one-half mile. Under Ecology’s direction, contractors for Avista Development, Inc., placed a three-layered cover called an engineered cap over the contaminated sediments on the river bottom. The cap is made of coal, sand, and gravel and is intended to isolate PCBs and keep contaminants from moving. Donkey Island PCB Site Cleaned Up in 2007This project is east of the dam in wetlands and backwater channels found on the north bank of the river. Ecology provided oversight as contractors removed PCB-contaminated soil and restored the area with clean sand. Areas disturbed during PCB removal were replanted in the spring of 2007.
Dredging PCBs at Donkey Island
For construction details and associated documents for both sites, please click on the links below. Site DocumentsFact Sheet: Spokane
River Project Update 2007
Fact Sheet Engineering Design Report: English Русски Español Engineering Design Report (English only) Table of Contents Introduction Deposit 1 Remediation Deposit 2 Remediation Compliance Monitoring and Construction Schedule References Figure 1 Figure 2: Deposit 1 Site Overview Figure 3: Deposit 2 Sampling Figure 4: Deposit 1 Site Access Plan Figure 5: Deposit 2 Sampling Station Cores Figure 6: Deposit 2 Access Routes and Staging Stockpiling Areas Figure 7: Timeline for Upriver Dam PCB Sediment Site RD/RA Appendix A: Draft Final Drawings A1 B1 C1 C4 A2 B2 C2 C5 A3 B3 C3 C6 Appendix B: Construction Quality Assurance Plan Table of Contents Introduction Project Organization and Responsibilities Construction Remedial Action Construction Documentation and Reporting References Tables - Construction Submittals Figure 1 Figure 2 Figure 3 Figure 4 Appendix C: Table of Contents Introduction Roles and Responsibilities Routine Monitoring Events and Table 1 Figure 1 Remainder of Appendix C Appendix D: Table of Contents Introduction Bathymetric Survey Sediment Sampling and Analysis Quality Assurance Project Plan References Tables 1-3 Tables 4-5 Figure 1 Figure 2 Figure 3 Technical Specifications (English only) Table of Contents Part A General Conditions Part B Technical Specifications Document ArchivesRelated InformationAdditional Resources |
Facility Site ID:
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65178472
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SITE INFORMATION
