Monthly update for Sellers Auto / Artist Studio petroleum cleanup site 489201547 / 489201548 (Thirty-second update- July 1, 2009)‏

–Forwarded Message Attachment–
Subject: Monthly update for Sellers Auto / Artist Studio petroleum cleanup site 489201547 / 489201548 (Thirty-second update- July 1, 2009)
Date: Wed, 1 Jul 2009 16:05:14 -0400
From: Damon.Taylor@ocfl.net
To: louise.mills@siemens.com
CC: JRWebster@r-kidproperties.com; keder@argusconsulting.com; nevans@tempaco.com; Carlos.Gonzalez2@ocfl.net; Renee.Parker@ocfl.net; rhorton3@cfl.rr.com; gspears@lotspeichandassociates.com

July 1, 2009

Ms. Mills,

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

Report Status / General Status:

* I note from a preliminary copy of the upcoming report that during last 100 of that period (ending on May 27th), only a 64% run time was achieved. All of the down time was related to a alarm on the control panel “critical high level in infiltration gallery” due to too much of a throughput of water. I understand we lost approximately 2 weeks of run time since then as well resulting from recent heavy rainfall events.

* Multiphase wells- Groundwater recovery wells: The optimization strategy now is to leave off MPE (groundwater recovery) wells #15 through #22 (leaving on MPE points # 1 though #14, #23 and #24. This is only a slight variation of what it was last month.

* Multiphase wells- Vapor recovery wells: All 24 of them are running. I think we would be better off turning some of them off, but Argus has explained to me that without a large enough total air flow volume, there is a backpressure problem with the blower that drives the vapor extraction. The blower is equipped with a bleed air valve for this, but opening this bleed valve will increase the noise the system produces. The strategy so far has been to give the blower the air it requires from the subsurface treatment points (all 24 of them) instead of using bleed air. The only problem with this, is the high water table is causing too much water recovery (from the groundwater recovery portion and the unintentional water from the vapor recovery) which causes the system to be periodically shut down. Argus may further explore the idea of using partial bleed air and to shut off some MPE vapor wells.

* Treatment points MPE-3, MPE-4 and MPE-5 are still being maximized for treatment around the area of MW-5.

* The floor of the equipment building on the air compressor side has been repaired since the last update. We noticed a different area of the building where the floor has also been damaged, which will need to be repaired later.

* We have the cost proposal in house now (received 06/29/09) and will be putting together a work order very soon to be funded by the FDEP. The Year Three, Quarter One Operation and Maintenance Report, but have not received it yet. It is not due until July 30, 2009, but we are expecting it earlier. Today I received a preview of the tables including the milestones.

After the Year Three Quarter One report (due July 30th), the next one is due October 30th and it too should be submitted a little earlier. Overall, we are about 2.4 yrs into our 4 year cleanup without factoring in the downtime we had from oxidizer approval and noise issues.

Milestone Update:

The new milestone data comes from the last quarterly sampling event performed on June 1, 2009. 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).

AW-11 has been clean for four consecutive quarters
AW-22 has been clean for six consecutive quarters
AW-24 has been clean for four quarters but only sampled three times since July ’08

o AW-3 has completely met CTL for the first time. It had been passing milestones, and now it has completely met cleanup criteria for all petroleum constituents. We will need to cautiously watch this well though becomes the reduction trend since system startup hasn’t been very linear and has actually gone up and down with respect to Ethylbenzene and Total Xylenes concentrations. So we will watch it for potential rebound, which I don’t believe would be significant. Still, it is completely clean now.

o AW-7 has completely met CTL for the second consecutive quarter. I think this well has less potential for rebound than AW-3.

o MW-5 has not been meeting milestones for a long time now. Argus has documented this to us and mentioned on most of the last summaries for the last year or so, a remedial action plan modification is still needed to treat this area more affectively. The pilot test will be performed in this area and will give Argus the data they need to design and implement a modification here using air sparging and soil vapor extraction. Many of the contaminants failing milestones in this well show concentrations above baseline level.

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. The levels of contaminants found during the June 1, 2009 sampling event are very similar to what was found during the February 25, 2009 sampling event. This well is near MW-5 located near the former Sellers Auto side of the project, where the pilot test is proposed. AW-26 and AW-27 (last sampled in March 2009) are new wells and weren’t scheduled to be sampled this time. They were installed and sampled once so far. These are also in this same area where the pilot test and remedial action modification is needed 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.

I look forward to sending you my next update on August 3, 2009. I believe we may have a work order in placed to perform the pilot test and remedial action plan modification by then, or shortly after then. 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
http://www.orangecountyfl.net/cms/default.htm
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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