Monthly update for Sellers Auto / Artist Studio petroleum cleanup site 489201547 / 489201548 (Forty second update)

Subject: Monthly update for Sellers Auto / Artist Studio petroleum cleanup site 489201547 / 489201548 (Forty second update)
Date: Mon, 3 May 2010 15:12:54 -0400

May 3, 2010

Ms. Mills,
I would like to take this opportunity to give you our forty-second monthly update on the project.

General Status:
The system was off for a while due to no work order being in place to fund it, but that has been resolved and the system was re-started last week.

The implementation of a Remedial Action Plan Modification is critical to meeting the cleanup deadline of being able to turn off the system in February 2011 to begin the one year monitoring phase. I am including a map this time that shows the entire monitoring well and treatment well network along with a blow up of the area where the contamination persists.

System Runtime:
Notwithstanding the time where there wasn’t a work order, the system runtime has been pretty good since October, greater than the required 80%, thus in compliance with the Remedial Action Initiative requirements.

System Performance:
The cumulative gallons of groundwater processed is about 18.4 million gallons as of mid February. Historically the rainy period has more system shutdowns and there hasn’t been a reporting of that in several months.

Report Status
The Remedial Action Plan Modification Response to Comments as well as the Year Three Quarter Four Operation and Maintenance Report are in house now (received 04/19/10) and will expedite my review of these now.

Milestone Update:
The most recent groundwater sampling data is from the week of February 23, 2010. The new data summary follows: The approved RAPMod stated that the goals for this site are 90% reduction for the chemicals of concern (COC) to contaminant target levels (CTLs). The key milestone wells that have been sampled for this project are wells #AW-3, AW-7, AW-11, AW-22, AW-24, and MW-5. However, there’s a larger set of wells in this report since this one is an annual report. Of the eighteen monitor wells sampled this time, only four of them are above groundwater cleanup target levels.
· 14 wells below contaminant target levels (CTLs) : AW-2, AW-3, AW-7, AW-11, AW-18, AW-22, AW-24, AW-26*,AW-27, DW-11, MW-1, MW-2, MW-3, MW-6. *note. AW-26 was one of the assessment wells during our investigation around MW-5 and AW-10. This well had contamination, which has went away. It is one I recommending watching carefully for rebound, but it is below Chapter 62-777, F.A.C., Table 1 Groundwater Cleanup Target Levels for all COCs analyzed.

· AW-10. Although this well has decreased a great deal, it still has significant contamination.

· MW-5K – This well was usually linked to AW-10 in my past updates. By comparison, MW-5K was always much higher than AW-10. MW-5K has decreased and is now has levels comparable with AW-10.

· AW-28 – This well is the most contaminated well. It has been sampled three times since it was installed last year and , although the values have fluctuated, it is a source well. This well will become a milestone well for the Remedial Action Modification implementation.

· MW-9 – This well decreased dramatically a year ago and is at plateau with very low levels of benzene still present.

As usual, I’ll send you a new update next month as well, on June 1, 2010. Please feel free to call me anytime if you need additional information or have any questions.

Thank you,
Damon Taylor, Environmental Case Manager
Orange County Environmental Protection Division
800 N. Mercy Drive, Suite 4, Orlando, FL 32808
Direct (407) 836-1480, Main (407) 836-1400
Fax (407) 836-1417

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