Sagasser & Associates, Inc.
Environmental Assessment & Engineering Services
Sagasser & Associates, Inc.
PORT AUSTIN SHELL SERVICE [PASS], PORT AUSTIN, MICHIGAN

Client: MDEQ Project Management Firm - Clayton Environmental Services
Site Location: 8490 Lake Street, Port Austin, Michigan
Project Dates: 04/00 - Present

Sagasser & Associates, Inc. was subcontracted by a State of Michigan Contract Management firm to complete Acute Risk Abatement, Site Investigation and Focused Feasibility Study, Remedial System Design, and Construction/O&M Oversight. The project involved identification of potentially contributing sources to the LUST site contamination, vapor monitoring of indoor air and substructures, soil and groundwater contaminant delineation utilizing direct push technology, and free product delineation. A leak was discovered in the former UST systems at the Site, which were subsequently removed and replaced. Previous assessment work identified soil and groundwater contamination that extended to adjacent properties.

An extensive SI that included 17 soil borings and 18 additional monitor wells was conducted to identify subsurface characteristics and delineate contaminants. Soils at the Site consisted of fine-grained soils to a depth on the order of 10 feet bgs, underlain by weathered/fractured sandstone and shale. The groundwater aquifer typically begins at a depth on the order of 12 feet bgs, but rises to 8 feet bgs in the monitor wells due to confined conditions.

Two separate free product plumes (emanating from the UST basin and former dispenser island) have been identified and extend beyond the Site boundaries. Two separate groundwater contaminant plumes extend approximately 500 feet down gradient of the Site, with vertical migration in the fractured rock extending to depths on the order of 40 feet bgs. Free product monitoring and interim abatement activities were also completed. Sagasser & Associates, Inc. also conducted vapor monitoring activities within on-Site and down gradient structures.

A Final Assessment Report, pilot testing activities and preliminary remedial design have been completed. The remediation strategy to be employed consists of dewatering the impacted zones within the fractured bedrock and utilizing SVE to mitigate subsurface contaminants. Numerous other reports have also been prepared for this project including ARA, SI, FFS, Preliminary Remedial Design and Construction Specifications and Free Product Monitoring Reports.

 


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