Monthly update for Sellers Auto / Artist Studio petroleum cleanup site 489201547 / 489201548 (Thirty-sixth update)‏

–Forwarded Message Attachment–
Subject: Monthly update for Sellers Auto / Artist Studio petroleum cleanup site 489201547 / 489201548 (Thirty-sixth update)
Date: Mon, 2 Nov 2009 10:52:48 -0500

November 2, 2009

Ms. Mills,

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

General Status:
The consultant (Argus) completed the pilot test this month and a pilot rest report was received here at Orange County this morning. The pilot test was purposed for evaluating air sparging with vapor extraction in the area where concentrations are not reducing as fast as we’d like. The cleanup has been successful in all the areas it has occurred except for the area around monitoring well AW-10/MW-5/AW-26, which is a limited area along the sidewalk in front of the former Sellers Auto (the green building). The next step is for Argus to submit a Remedial Action Plan Modification for the design of the system modification. The step after that is for Argus to submit construction drawings and a bid package to perform the work. It is hard to anticipate the time it will take for the implementation to be started up, but we imagine it would polish off this area in one or two quarters at the most, once it is installed and turned on.

During the time all of the supplemental assessment, pilot test planning and pilot testing have been going on, the system has been operational. When the Remedial Action Plan Modification and construction occurs, the system will also continue to be operational. There is no need to cease operation of the system while this occurs because contaminant mass continues to be removed from the subsurface.

The cleanup goal is a four-year active phase remediation term plus an additional year of post active monitoring. We are striving to finish early and not have the system run for the full four years. I believe the use of air sparging/soil vapor extraction in front of the former Sellers Auto will allow that to happen. The most recent operation and maintenance report received by Orange County is the Year Three, Quarter Two (Tenth Quarter) Report. We are 63% through with the planned active remediation period by using the number of reports submitted. The system started up in February 2007 and has been operational, save for the downtime, for about two years and eight months or almost 11 of the 16 quarters planned. The tentative date that we would expect to be finished with active remediation is January or February 2011, and completing post active remediation monitoring shortly after February 2012. Again, we will continue to strive to beat these deadlines.

System Runtime:
The system runtime during this quarter was less than the required 80% with the major cause of downtime attributed to the system being shut down due to the significant rains during this period. There has been a lot of downtime since startup in February 2007 for various reasons discussed in past updates. The current cause of downtime reported by Argus is that the infiltration gallery, where the treated water is put back into the ground is. Argus states that beginning in April 2009, rainfalls have been very high and we have received 11 inches more rain than average. The infiltration gallery can’t keep up with the rainfall and percolating treated water fast enough. The infiltration gallery was to be designed to keep up with the highest rain events, but we are seeing this isn’t the case. We can expect better efficiency now though as we are entering the dry season.

· Groundwater: Between February 2007 to August 2009, 14.2 million gallons of water have been treated. The rate per month or per quarter has been variable, but during the last three months report, which was from the end of May to the end of August the amount was almost 1.6 million gallons.
· Vapors: The air samples collected for the last six months have been below laboratory detection limits. Although some petroleum mass is still be extracted both from the groundwater and from the vapors, the mass has almost completely diminished. We expect to see more mass recovery when we begin air sparging in front of the former Sellers Auto.

Maintenance of the Equipment:
Below are maintenance items that we understand Argus recently addressed:
· There were some broken flow meters that were recently corrected.
· An air filter for the SVE system was several months overdue to be changed, but was recently changed.
· This is not a maintenance issue, but the oxidizer that hasn’t been needed in about a year is planned to be moved to a site in Brevard County in early 2010. This won’t affect the system operation. This will allow room for the carbon to be put back before the air sparging begins.

Report Status
The Year 3, Quarter 2 Operation & Maintenance Report was received October 28th and is being reviewed now. I briefly looked though the Pilot Test Report this morning and will complete my review of it very soon. The next report I will receive from Argus is the Year 3, Quarter 3 Operation & Maintenance Report, which is due on December 31, 2009, but we expect Argus will be able to submit this one earlier.

The Remedial Action Plan Modification is due December 30, 2009.

Milestone Update:
The most recent groundwater sampling data is from August 28, 2009, which was discussed in my last update. All performance measurement key monitoring wells except for one of them are meeting milestones. From the last update:

The approved RAPMod stated that the goals for this site are 90% reduction for the chemicals of concern (COC) to contaminant target levels (CTLs). Of the 12 monitor wells sampled, the following eight monitor wells: AW-3, AW-7, AW-11, AW-18, AW-22, AW-24, AW-25, and MW-6 currently are below Chapter 62-777, F.A.C., Table 1 Groundwater Cleanup Target Levels for all COCs analyzed. The remaining monitor wells: AW-10, MW-5, MW-9, and DW-11, had COCs above the CTLs. Of the four monitor wells with COCs currently exceeding CTLs, only one well (MW-5) is not meeting the milestones. In the last four or five quarters we hit a plateau with contaminants in a couple of monitoring wells near the sidewalk of the former Sellers Auto site is not reducing as rapidly as we’d like.

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

Thank you,

Damon Taylor, Environmental Case Manager
CFEA # 408 / LEP # 201
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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