Monthly update for Sellers Auto / Artist Studio petroleum cleanup site 489201547 / 489201548 (ninth update- July 2, 2007)

From: Damon.Taylor@ocfl.net [mailto:Damon.Taylor@ocfl.net]
Sent: Monday, July 02, 2007 3:13 PM
To: Mills, Louise P21324
Cc: hortonra@terramaxinc.com; Renee.Parker@ocfl.net; Carlos.Gonzalez2@ocfl.net
Subject: Monthly update for Sellers Auto / Artist Studio petroleum cleanup site 489201547 / 489201548 (ninth update- July 2, 2007)

Ms. Mills,

I would like to take this opportunity to give you our ninth monthly update on the project. The startup occurred in late February 2007 and we are on a 4-year cleanup schedule.

Since my last update, the vapor extraction portion was bringing such high concentrations up from the ground that it is more than the carbon vessels can handle. A Remedial Action Plan Modification is needed to use a thermal or catalytic oxidizer to address these vapors. A decision was made to use the large sized oxidizer currently available to be transferred from a site in Quincy, FL. Today, the consultant is delivering the Remedial Action Plan Modification and transfer paperwork to make this change, so the oxidizer that has become available may be transferred and hooked up to this site. In the meantime, the soil vapor extraction portion of the system must remain off. It was shut down shortly before the last update we sent and I believe it will be off until shortly after the next update as well.

As of the last update, we hadn’t received the Startup Report, which details the optimization of the system. Since this time, we received both the Startup Report and the First Quarterly operation and maintenance report.

Progress is measured from reduction in groundwater concentrations in key monitoring wells that are representative of the plume. From a cursory review of the most recent data, I see significant reductions in groundwater contaminants in key monitoring wells: AW-11 and AW-12.

Key monitoring wells AW-3 and MW-5 are not on track and are behind the current milestone schedule. They must be watched carefully for the next quarterly report to see if this trend continues.

We lack data from AW-7, and AW-24 due to the wells running dry and not being able to be sampled.

The water table will rise again and the two milestone evaluation wells that were dry last time will be able to be sampled. In the meantime, the low water table is an opportune time to make the most out of the soil vapor extraction system, which is currently down. So, we have asked Terramax to expedite the Remedial Action Plan Modification and change order associated with moving the oxidizer unit down. I expect it at any moment.

The groundwater recovery portion of the multiphase effort is still on and will not have to be interrupted for this. The issue of resolving the amount pumped from each well each month is still being worked on by Terramax. The counters on each pumping manifold seem to get stuck a lot and the vendor has been notified of the problem.

I expect to have more performance evaluation data in the next update on August 1, 2007, after the Division has had time to review the Startup and Quarterly Report. In the meantime, here is the first evaluation of the key monitoring wells in an Excel Table.

Key Monitoring Wells Report

Please feel free to call me anytime if you need additional information or if you would like me to find something in our files. Also. I am always available to meet you onsite if you want to show me of any concerns you have.

Damon Taylor CFEA, LEP
Orange County Environmental Protection Division
Petroleum Cleanup Team
800 N. Mercy Drive, Suite 4, Orlando, FL 32808
Voice (407) 836-1480, Fax (407) 836-1417

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