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

From: Damon.Taylor@ocfl.net [mailto:Damon.Taylor@ocfl.net]
Sent: Mon 4/2/2007 2:05 PM
To: Mills, Louise P21324
Cc: Renee.Parker@ocfl.net; Carlos.Gonzalez2@ocfl.net; hortonra@terramaxinc.com
Subject: Monthly update for Sellers Auto / Artist Studio petroleum cleanup site
489201547 / 489201548 (sixth update- April 2, 2007)

Ms. Mills,

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

The system has been running for approximately six weeks now (about one half of
the first reporting quarterly reporting 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. However, we have
been keeping an eye on the system by visiting the site often to see how it is
working and taking not of what is not working. We had a brief teleconference
with the consultant, Terramax on Friday March 30th that we had scheduled.
Although I missed the teleconference due to illness, David Jones, the county
professional engineer handled this in my absence. It was agreed that the
startup report should be held until all the components will be complete, thus
holding the retainage on the work order until that time. The first quarterly
report is still not due for a couple of months and it will contain all the
operational data as well as the first groundwater sampling data after startup.

As you may remember from the Remedial Action Plan and past discussions, the
remediation system at this site is a multiphase extraction system, which
includes 24 submersible groundwater pumps each located in a vertical well that
is also capable of extracting vapors above the water table. The contaminated
groundwater pumped from each well into a common underground header pipe that
leads to the remediation building for treatment and then is pumped back to the
infiltration gallery in the gravel parking lot on the corner of Midway and
Philadelphia. While the groundwater is pumped and treated, a vacuum is applied
above the water table to all of these treatment wells and vapors are extracted
to the remediation building and treated. There are also 8 biosparge wells by
the lakeshore for low flow sparging to create a sparge curtain.

It is not uncommon with complicated systems like this that there are initial
problems that must be dealt with to maximize the efficiency of the system.
Usually they are worked out in the first week or at least during the first month
or so. Below are problems that remain so far:

* The soil vapor extraction system (SVE) was started since our last update but
is operating a much lower flow rate than anticipated. The water in the lines is
a problem that Terramax has been working on resolving by lowering the
vacuum/airflow until the groundwater table drops enough that the vacuum/airflow
may be increased again. However, since better groundwater pumping is needed to
help remedy this, the next bullet item is also key to resolving this one. There
is a bleed valve on the equipment that allows the vacuum/flow at each wellhead
to be reduced. Typically the rushing in of this bleed (dilution) air increases
the overall noise of the system. This valve may not be needed to be open much
longer. It has since been re-routed to inside the building, which reduce the
noise somewhat should it still be needed. A new goal (flow rate) will be
established after the groundwater pumping and SVE rates are optimized. For
example, if 100 standard cubic feet per minute of air flow from each SVE well
cannot be obtained based on the site conditions, Terramax may propose a reduced
rate (such as 35 standard cubic feet per minute per well) is more reasonable
based on their engineering evaluation of the system in the first month or two of
it running. Whatever value that Terramax proposes in the upcoming Startup
Report 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.

* In my last update, I reported that there were some leaking pumps. It turns
out there were 8 of them that had problems as we noted in our 03/23/07
inspection. These individual wells had been turned off pending the repairs.
Terramax repaired some today and assure us that all of them will be fully
functional by Wednesday or Thursday (4/04/07 – 4/05/07). Well # MPE-23 had not
been operating at all yet because it was believed to have been installed
incorrectly, but I learned today that they were able to get the pump into it
today. The well may not have to be re-installed like we had thought.

* A manifold is being installed to provide better flow control of the
biosparging wells (the 8 by the lake) as of today. The manifold is being
shipped and Terramax believes it should be installed by this Friday (04/06/07).

* The fence has been installed, but the front gate has not. The owner/tenant of
the property that contains the equipment. Terramax says that by Friday
(04/06/07), the fence should be done.

* 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 offgas
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 am asking Terramax
to get the change order (VCO form) to us by Monday 04/09/07 – or sooner.

On the positive side, we have been getting continued treatment of the
groundwater since startup and have been recovering vapors from the unsaturated
zone for most of the period since the startup. As of 03/23/07, the system had
treated over 300,000 gallons of groundwater.

I am pleased to report that we have finally began remediation and look forward
to reporting the progress to you as we get closer to our cleanup goals. 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
Orange County Environmental Protection Division
Petroleum Cleanup Team
800 N. Mercy Drive, Suite 4, Orlando, FL 32808
Voice (407) 836-1480, Suncom 356-1480, Fax (407) 836-1417

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