Monthly update for Sellers Auto / Artist Studio petroleum cleanup site 489201547 / 489201548 (twenty sixth update- January 5, 2009)

Subject: Monthly update for Sellers Auto / Artist Studio petroleum cleanup site 489201547 / 489201548 (twenty sixth update- January 5, 2009)
Date: Mon, 5 Jan 2009 16:08:40 -0500
From: Damon.Taylor@ocfl.net

January 5, 2009

Ms. Mills,

I hope you had a nice Holiday Season.  I would like to take this opportunity to give you our twenty-sixth monthly update on the project.

Report Status / General Status:

No reports are in house at the time, with one a few days past due (due December 31, 2008).   Today, Argus provided me with some of the data via E-Mail so I could prepare this update with the updated quarterly milestone data (below).  Argus is hand-delivering the hard copy of the report tomorrow morning, which I believe will be titled the Year Two, Three Quarter report.

The cleanup goal is a four-year active phase remediation term plus an additional year of post active monitoring.

The tentative date that we would expect to be finished with active remediation is approximately February 2011 and completing post active remediation monitoring shortly after February 2012, since startup occurred in February 2007.     As long as funding continues, there still should be no problem meeting or beating these deadlines.

The assessment I mentioned in the last update addressing the lingering contamination seen at MW-5 and AW-10 is currently being tasked to a new work order, which is in line to be funded pending administrative work order review.  It may be funded in time for the next update notwithstanding any dramatic changes in the State budget.

The system is currently running and the oxidizer remains off and onsite pending the approval of its use at a site in another county.

Milestone Update:

This update includes the milestone data from the November 11th / 13th,  2008 groundwater sampling event.  All performance measurement key monitoring wells except for one of them are meeting milestones. The milestones are based on a 90% reduction in concentrations during the active phase of remediation.

* AW-3, AW-7, AW-11, AW-22, & AW-24 are meeting milestones

* MW-5 is NOT meeting milestones

o AW-11, AW-22, and AW-24 have completely cleaned up  – met Groundwater Cleanup Target Levels (GCTL).

o AW-3 and AW-7 have almost met GCTL .   These wells are very close to being cleaned up, with the levels of contaminants lower than they have ever been.  AW-3 shows only 1.8 ug/L over the final cleanup goal for benzene and AW-7 is only 28.4 ug/L over the final cleanup goal for the total xylenes.   This is very similar results to the last milestone update, so the decease in contaminants has maybe reaching a plateau.  After the other wells have reached this goal further treatment in this area may no longer be needed, but these wells will need to continue to be sampled so that it can be determined that a rebound effect is not taking place.

o MW-5 is in the area I mentioned above where additional assessment prior to a remedial action plan modification is needed.   There is also another well, although not currently being evaluated meeting milestones but there is still a lot of room for improvement.  Every one of the contaminants failing milestones in this well show concentrations above baseline level.  It isn’t unusual to see a rebounding effect at the plateau stage, but as we have known for at least a couple of quarters, this area is not being addressed by the current system and a remedial modification is needed.

o AW-10 is another well (though not currently a performance measurement key well) that will need to be addressed because this well has levels of contaminants similar to MW-5. However, this well did not rebound nearly as bad as MW-5.  This well is near MW-5 located near the former Sellers Auto side of the project.

One major difference this time is that the groundwater sampling was performed with the system running and with the water table slightly lower.   Although not required, past sampling events occurred with the system off so a static groundwater table was observed.  Once per year during the annual sampling event, it is required to sample under static conditions.

I will send the next update on February 2, 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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