RELEVANT ASPECTS

Key PM Environmental Personnel

Peter S. Bosanic, P.E., C.P.
Grant DeWitt, P.G.
Kevin Schlett, C.P.
Adam Patton
Casey Armstrong

REMEDIAL INVESTIGATION AND CORRECTIVE ACTION AT MDEQ-RRD LUST SITE IN LUPTON, MICHIGAN :

Client: Confidential

Site Location: Lupton , Michigan

Start Date: 2001

Completion Date:2005

Start Budget: $210,000

Final Cost: $173,000

PM Environmental, Inc. (PME) was the Professional Services Contractor (PSC) for the Lovewell’s Corner site located in Lupton ( Ogemaw County), Michigan.

PME was awarded the PSC contract and the scope of work involved delineation of the full extent of soil and groundwater contamination, identification of contaminant pathways and receptors, and identification and abatement of the acute hazards. PME drilled approximately 20 soil borings and installed approximately 15 monitoring wells to delineate the nature and extent of petroleum contamination which migrated offsite under a county road.

There were several nearby potable water wells that were screened from approximately 40-feet bgs in an aquifer that is hydraulically connected to the shallow perched groundwater that was contaminated. The geology consists of sand/gravel/cobbles from grade to about 10 feet bgs, underlain by a clay aquitard ranging in thickness from about five feet to one foot across the site, underlain by a sand/gravel aquifer. The clay layer was breached at the former UST basin, resulting in a conduit from the upper contaminated perched groundwater to the lower drinking water aquifer.

A FAR with a FS/CAP was completed that identified the contaminated groundwater, that had migrated offsite with concentrations above Part 213 residential volatilization to indoor air RBSLs and onsite soil contamination that was also present above direct contact and volatilization to indoor air RBSLs, as well as the breach in the clay aquitard with the potential to contaminate the deeper aquifer above Part 213 drinking water RBSLs as acute hazards. The Feasibility Study recommended excavation of the highly contaminated soil, placement of oxygen release compound (ORC®) into the bottom of the excavation, and the installation of twelve ORC® injection wells down gradient from the source area of the former USTs and pump islands, the installation of a geosynthetic clay liner above the breached clay, and performance monitoring.

Bid specifications were prepared and submitted to approximately 25 prospective Construction Trade Contractors (CTCs). A mandatory pre-bid meeting was held at the site and bids from the CTCs were received. PME conducted a bid evaluation of the three lowest bids and made recommendation of award of a CTC that was subcontracted directly by DLZ.

PME and the CTC implemented the CAP during the spring of 2002. PME provided full-time construction and management oversight of the CTC that included review of all CTC construction submittals, daily and monthly reports, and monthly invoicing as required by DLZ and the State of Michigan. Quarterly performance monitoring of the monitoring well network was also conducted by PME. Monthly Progress Reports and Monthly Invoicing were submitted by PME to DLZ as required by DLZ and the State of Michigan.