Remedial Design and Construction Support
The Problem
For a contaminated intertidal channel in a highly urbanized area within San Francisco Bay, TIG Environmental is assisting the PRP group with pre-remedial design studies. EPA proposed a time-critical removal action for removal of more than 20,000 cubic yards of contaminated sediment.
The Solution
TIG Environmental and a design team with engineers and scientists from multiple specialist firms helped its client achieve agreement with EPA to apply a risk-based multi-technology remedial approach. We are now conducting pre-remedial design studies that include specialized evaluations of sedimentation rates, depth of the biologically active zone, bulk sediment and pore water chemistry, erosion and particle transport, and geotechnical parameters. Overall, the studies will support the design for dredging, capping, and monitored natural recovery of the contaminated sediments.
Value Added
EPA’s original proposal focused solely on removal of contaminated sediments, which would have been costly. TIG Environmental was able to utilize our expertise at sediment cleanup sites to demonstrate the effectiveness of a risk-based approach. This alternative approach will result in significant reduction in removal volume and overall project cost.
