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C7Wk kal r6A4i 1XC %woo Page 2 <br /> City of Escalon <br /> Project No.: 750.2 <br /> August 11,2003 <br /> Proposed Direction of Pro'ect <br /> On June 23, 2003, GTI wasdirected to restart the IC Unit at the site. The IC has been upgraded <br /> in order to meet the required hydrocarbon destruction criteria. Geological Technics Inc. <br /> proposes the following work be performed at the site: <br /> 1. Soil Vapor Extraction <br /> • Perform soil vapor extraction for a period of one year <br /> • Collect and submit influent and effluent vapor samples from the IC as follows <br /> o Biweekly for the first month <br /> o Monthly there after for the balance of one year <br /> • Alternate vapor extraction wells periodically to promote the movement of oxygen in the <br /> subsurface, hinder the formation of preferential pathways and groundwater mounding <br /> and maximize the radius of influence for recovery <br /> 2. Perform groundwater monitoring. <br /> • Purge and sample the six (6)monitoring wells on a quarterly basis for one year <br /> • Submit the quarterly groundwater samples to Sherwood labs for: <br /> ❑ BTEX,TPH-G(EPA 8021 B) <br /> ❑ Fuel Oxygenates by EPA method 8260 <br /> Proposed Biddinu of Project <br /> 1. We have found that Sherwood Labs, Hilmar, CA to be both cost effective and currently in <br /> compliance with AB2886 mandated electronically deliverable format requirements. <br /> 2. Del-Tech has had the system in operation for nearly a year. GTI finds that they are <br /> competitively priced and restarting the existing system would prevent delays in permitting. <br /> These costs have been included in our budget-spreadsheet prepared giving estimated costs for <br /> performing the work directed by SJC-EHD. The budget spreadsheet shows itemized costs for <br /> the tasks proposed in the attached action plan. In an attempt to make this Pre-Approval flow <br /> smoothly, we have used the same unit costs for this work that have previously been approved <br /> by the USTCFP for other projects. <br /> Geological Technics Inc. accepts field support services and lab invoices and adds a 15% <br /> overhead fee. <br /> Tentative Schedule for Implementing Work <br /> The proposed schedule for the additional site characterization work and risk evaluation study is <br /> as follows: <br /> Task Description Completion Date <br /> • Submit Bids/Cost pre-approval to the Fund August 2003 <br /> • Receive Cost approval from the Fund September 2003 <br /> • Restart the Internal Combustion VETS September 2003 <br /> • Perform Groundwater Monitoring September 2003 —September 2004 <br />