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Record of Decision System (RODS)



Address:  5411 NE HWY 99 
City & State:  VANCOUVER  WA  98666
County:  CLARK
EPA ID:  WA1891406349
EPA Region:  10
NPL Status:  Deleted from the Final NPL
ROD Type:  Record of Decision
ROD ID:  EPA/ROD/R10-93/061
ROD Date:  05/06/1993
Operable Unit(s):  01
Media:  Soil
Contaminant:  Organics, Metals
Abstract:  The 235-acre Bonneville Power Administration Ross Complex (USDOE) (Operable Unit 1) is an active power distribution center in Vancouver, Clark County, Washington. The site is bordered by two streams, Cold Creek to the north of the site and Burnt Bridge Creek to the southwest of the site. The Columbia River is located approximately 2.7 miles south of the Bonneville Power Administration (BPA) Ross Complex. Land use in the area is predominantly residential, light industrial, and recreational. The estimated 18,000 people who reside within a one-mile radius of the BPA Ross Complex use the Pleistocene alluvial aquifer and the Upper Troutdale Formation to obtain their drinking water, domestic, and irrigation supplies. No wetlands exist on the site however several wetlands were observed west of the site along Burnt Bridge Creek. Since 1939, the site has been used to distribute hydroelectric power generated from the Columbia River to regions throughout the Pacific Northwest. Since its construction, the Ross Complex has provided research and testing facilities, as well as, maintenance, construction, operations, waste handling, and storage facilities, for the BPA. Maintenance activities at the Ross Complex routinely involved the handling of transformer oils containing PCBs, and organic and inorganic compounds associated with the storage of preserved wood poles, paints, solvents, and waste oils. The waste units investigated at the BPA Ross Complex are primarily the result of past research, storage, and improper waste handling activities. The site has been divided into OUs 1 and 2 for remediation purposes. OU1 consists of 19 of the 21 waste units at the BPA, a recreational hiking trail (the Ellen Davis Trail), and the possible exposure from airborne contamination. Subsequent evaluation of the 19 waste units indicated that 3 of these units required remedial action: the Wood Pole Storage Area East, the Ross Substation and Capacitor Yard, and the Capacitor Testing Lab. In addition, because of exceedances of the State soil cleanup levels, the State required BPA to conduct removal actions for soil in another seven waste units. This ROD addresses the threats posed at the three waste units identified above, as OU1. A future ROD will focus on potential shallow and deep ground water contamination, surface water and sediment quality in Cold Creek and Burnt Bridge Creek, and subsurface soil investigation in the two remaining waste units at the BPA, as OU2. The primary contaminants of concern affecting the soil are organics, including dioxin, PAHs, PCBs, and phenols; and metals, including arsenic, chromium, and lead. SELECTED REMEDIAL ACTION: The selected remedial action for this site includes excavating and treating onsite 3,700 yd[3] of soil from the Wood Pole Storage Area East using ex-situ bioremediation; performing a treatability study to determine treatment cell parameters; using an ethanol/water solution and ultraviolet lights to enhance the bioremediation process; conducting laboratory testing to monitor contaminant levels in the treated soil; backfilling and implementing one of two soil caps (depending on the static level of contaminants) at the Wood Pole Storage Area East, if contaminant concentrations do not decrease continuously; excavating and disposing of 1,196 yd[3] of soil from the Ross Substation and Capacitor Yard and 68 yd[3] of soil from the Capacitor Testing Lab area offsite in a TSCA approved landfill; conducting confirmatory testing in each excavation to ensure that cleanup standards have been met, then backfilling these with clean fill; and providing a contingency for onsite disposal and capping at Wood Pole Storage Area, if site contaminants exceed cleanup levels after treatment. The estimated capital cost for this remedial action is $950,000. PERFORMANCE STANDARDS OR GOALS: Chemical-specific soil cleanup standards are based on the State of Washington Model Toxics Control Act (MTCA) requirements, and include PAHs 1 mg/kg and PCP 8 mg/kg for the Wood Pole Storage Area East; PCBs 1 mg/kg for the Capacitor Testing Lab Area; and PCBs 10 mg/kg for the Ross Substation and Capacitor Yard. The Wood Pole Storage Area East and the Capacitor Testing Lab are considered residential areas under MTCA so their cleanup levels correspond to residential health based levels of 10[-6]. The Ross Substation and Capacitor Yard is considered industrial under MTCA so its cleanup level corresponds to industrial health based levels of 10[5]. INSTITUTIONAL CONTROLS: Institutional controls are not included in the selected remedial action; however, the contingency remedy for the Wood Pole Storage Area East will include institutional controls, such as deed and land use restrictions, to avoid disturbance of the soil cap and potential exposure to contaminated soil at the site.
Remedy:  The selected remedies for Operable Unit A (OUA) address the risk posed by the soil contamination at the site by removing and/or treating soil contamination to levels that are protective of human health and the environment and comply with Applicable or Relevant and Appropriate Requirements (ARARs).

Remedial Action is required at the Wood Pole Storage Area East, the Ross Substation and Capacitor Yard and the Capacitor Testing Lab.

The major components of the selected remedies under this ROD include:

* Excavation of contaminated soils at the Ross Substation and the Capacitor Yard and the Capacitor Testing Lab;
* Off-site disposal of contaminated soils from the Ross Substation and Capacitor Yard and the Capacitor Testing Lab at a TSCA approved landfill;
* On-site enhanced bioremediation treatment of contaminated soil plus capping and institutional controls if necessary at the Wood Pole Storage Area East, and;
* Confirmation soil sampling and analysis to ensure that remediation goals have been met.

Removal actions have been completed at a number of waste units throughout OUA to satisfy state requirements. Additional remedial action under CERCLA is not necessary at the remaining waste units because contaminant concentrations found in the soil do not pose an unacceptable risk to human health or the environment consistent with the NCP.
Text:  View full-text ROD [ 92K ]
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