Monthly update for Sellers Auto / Artist Studio petroleum cleanup site 489201547 / 489201548 (seventh update- May 1, 2007)

From: Damon.Taylor@ocfl.net [mailto:Damon.Taylor@ocfl.net]
Sent: Tuesday, May 01, 2007 1:41 PM
To: Mills, Louise P21324
Cc: hortonra@terramaxinc.com; Carlos.Gonzalez2@ocfl.net; Renee.Parker@ocfl.net
Subject: Monthly update for Sellers Auto / Artist Studio petroleum cleanup site 489201547 / 489201548 (seventh update- May 1, 2007)

Ms. Mills,

I would like to take this opportunity to give you our seventh monthly update on the project.

The system has been running intermittently since startup in late February. I say intermittently because not all components have been running all of the time, although portions of it have operated most of this period. To date, we still have not received the startup report that documents all of the various parts of the startup and the overall operating efficiency of the system, so I am unsure of exactly what the run times or performance efficiencies have been.

As a follow-up to the Division’s teleconference with the consultant on March 30th we sent out a informal notice on April 25, 2007 detailing the deficiencies so far and request a response in writing that all of them have been addressed. The Division still has to make a field visit to take measurements and document the first quarterly operational parameters. We expect to perform that in the next week or so. My last field visit was on April 18th. We were informed via telephone last week though that the system was fixed (leaks fixed) and that the system is running under optimum conditions.

The Startup Report should be received before our next update on June 1st. Below are some items of note since the system has started up in February:

The soil vapor extraction system (SVE) is operating at a much lower flow rate than anticipated. However, Terramax believes the original goal of over 100 standard cubic feet per minute per well was not realistic and that the data was based on a pilot test performed by another consultant. I will check to make sure the bleed valve is no longer needed and if this is closed if perhaps the vapor recovery could be enhanced. A value of 30 standard cubic feet per minute per well may be presented by Terramax in the upcoming Startup Report. This value will have to be evaluated and approved by the Division before it can be the new design flow rate. If the new flow rate that Terramax proposes is accepted by the Division, it will be the new standard for the future operation of the system.
The groundwater recovery portion is recovering water at a much greater rate than anticipated. These submersible pumps are driven pneumatically by the air compressor in the remediation building. I am told that the air required to be supplied by the compressor doesn’t leave any capacity to operate the biosparge wells by the lake. This too will have to be documented in the startup report. I suggest that whenever the pumps are not being used or are being serviced that the biosparge wells be activated in the meantime.
A manifold for the biosparging was installed since our last update, but as noted in the second bullet, the biosparging along the lake will not be able to be implemented fulltime.
I learned that the tenant has complained of petroleum odors associated with the system. The consultant believes this is coming from the air stripping unit inside the treatment building. This can be addressed by plumbing the off gas from this unit directly into the same treatment line that handles the soil vapor extraction gases. We haven’t discussed a timetable for this yet, but Terramax has been asked to submit a change order to address this. I have not received a change order from Terramax to implement this. If this is still needed, I ask again that the change order be submitted (by May 7, 2007)
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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