Monthly update for Sellers Auto / Artist Studio petroleum cleanup site 489201547 / 489201548 (twenty-ninth update- April 1, 2009)‏



Thank you for this 29th update report for the Sellers Auto and Artist Studio Petroleum Cleanup Site, with accompanying map, on behalf of the residents in the Lake Formosa Neighborhood.

We will review the attachment and your latest overview summary of site cleanup status and let you know if we have any questions or concerns.

As always, we sincerely thank you for keeping us so well-informed on this neighborhood cleanup project.

Best regards,

Louise Mills,
Secretary, Lake Formosa Neighborhood Association

–Forwarded Message Attachment–
Subject: Monthly update for Sellers Auto / Artist Studio petroleum cleanup site 489201547 / 489201548 (twenty-ninth update- April 1, 2009)
Date: Wed, 1 Apr 2009 09:23:11 -0400

April 1, 2009

Ms. Mills,

I would like to take this opportunity to give you our twenty-ninth monthly update on the project. The system is still running and the four year cleanup goal is still on track as long as a remedial action plan modification is able to be implemented soon to address the area around MW-5 and AW-10.

Report Status / General Status:

Although I don’t have a current report in house, on March 31st, I received the most recent groundwater sampling data from February 25th-27th including updated milestones for the key wells (AW-3, AW-7, AW-11, AW-22,.MW-5).

The supplemental assessment needed for the upcoming Remediation Action Plan Modification was mostly completed a few weeks ago and the only part of it that needs to be done is to install the monitoring wells in the area of AW-10 and MW-5). This would be done in less than on day and I am confident will be done before the next update.

The next report is due from Argus on April 29, 2009 but we expect to receive it sooner because the operation and maintenance period ended in plenty of time to complete the report a few weeks earlier.

System Status:

The system went down over the weekend but was restarted on Monday. There has not been very much down time reported lately, except for failsafe shutdowns when the water table gets too high in the infiltration gallery.

Milestone Update:

This update includes new milestone data from the late February GW sampling event.

  • Wells AW-7, AW-11, AW-22 have always been meeting milestones and still do. In fact these wells have completely cleaned up.
  • AW-3 was doing well in the past few quarters, but rebounded significantly this time. This well fails milestones for the first time. The concentrations increased this round to levels close to what it was when it started up. AW-3 is located about 55 feet north of our most contaminated well (MW-5). We will have new monitoring wells in this area in the upcoming supplemental assessment.
  • MW-5 fails milestones as well and has rebounded for some petroleum constituents and decreased in others. The heavier molecular weight compounds decreased in concentration and the lighter molecular weight compounds increased in concentration.
  • AW-10 is not a milestone evaluation well, but we’ve been paying close attention to this one because it is slightly north of MW-5 and also represents the area where focused treatment is needed. This well showed another decrease in concentration. The current concentrations and ratio of petroleum constituents for this well are close to that of AW-3 mentioned above. AW-3 and AW-10 are about 35 feet apart.

A more comprehensive sampling event occurred in late February and there were eleven wells were verified as clean this time. This was a static found of sampling, meaning that we shut the system off about a week prior to get data that represents the undisturbed aquifer. I am attaching a PDF of a map that shows the trouble area that needs the focused treatment. Using a sharpie marker, I drew what I interpret a worse case scenario of the extent of the area, but an updated plume map from Argus will be available soon based on the supplemental assessment they are doing and may be available before the next update.

I will send the next update on May 1, 2009. Please feel free to call me anytime if you need additional information or have any questions.

Thank you,

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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