GROUNDWATER DEVELOPMENT

PROPERTY TRANSFER
• Lake Union Redevelopment
• Anacortes Refinery
• Seattle & Bethlehem Steel
REMEDIAL INVESTIGATION & CLEANUP
EXPERT WITNESS
WELLHEAD PROTECTION
SOLID WASTE COMPLIANCE
WATER RIGHTS SUPPORT
DATA MANAGEMENT
GROUNDWATER MODELING
WATERSHED ASSESSMENT
AQUIFER STORAGE & RECOVERY
WASTEWATER & STORMWATER RECHARGE
 

Client: Seattle Steel & Bethlehem Steel
Project: Investigation & Transfer of 11 Properties
Location: Seattle, Washington

Background
The Seattle Steel and Bethlehem Steel Corporations owned seven “brownfield” properties in Seattle and four in California. Because of their environmental conditions, these properties were underused.

Challenges
Bringing these properties to efficient endpoints for transfer required thinking outside the box. Their environmental histories, regulatory settings, and cleanup needs varied widely, and previous consultants had only implemented long-term monitoring programs, a costly strategy that produced limited benefits.

Approach
Our multifaceted approaches for these properties ranged from sampling and reporting to complex measures designed to achieve clean closure under RCRA. At the California sites, where perched aquifers had been releasing chlorinated solvents into primary aquifers, we proposed using an “attenuation factor” method. At one property, we investigated the source of contamination, which appeared to originate off site. Our work for the Seattle sites entailed not only cleaning up cooling pond sediment but also developing an alternate remedy for PCB-contaminated soil — the first in EPA Region 10.

Outcome
Regulators accepted our attenuation factor model and approved it for closure; they also accepted our innovative alternate remedy for PCBs, saving more than $1 million in redevelopment costs. Our source investigation confirmed that contamination indeed originated off site. This work, supported by our clear communication with clients, the Washington Department of Ecology, and potential buyers, facilitated the successful cleanup and transfer of all 11 sites.

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