Date: Fri, 1 Aug 2008 09:29:18 -0400
Monthly update for Sellers Auto / Artist Studio petroleum cleanup site 489201547 / 489201548 (twenty first update- August 1, 2008)
I would like to take this opportunity to give you our twenty first monthly update on the project.
The last quarterly report was received July 8, 2008 and the next one is due October 2, 2008. There are currently no reports in house for the County to review. However, we requested a response to our comments in a letter reviewing the most recent report and a detailed response to our letter will be due at the end of August. I don’t believe Argus has received that letter yet, but will probably get a copy of it today. We noted in our letter that no preventative maintenance checklists (PMC) were included in the report as required by paragraph III.C of the RAI to document that preventative maintenance is being performed in accordance with all the manufacturer’s recommendations. In our letter, we are also requesting that Argus dial into the system daily to ensure it is operating because a couple of times during the last few months, the County O&M inspector discovered the system off and found that the consultant was not already aware of it. An lightning storm had cause the telemetry to malfunction, and was thought to have been subsequently repaired.
So, the next full quarterly report should cover a period that spans from mid April to late July 2008. This one will be the second quarterly report from Argus Consulting. Argus began working on the site at the beginning of the calendar year and experienced a significant down time during 2008 due to the oxidizer & noise issues.
I had expected we would be able to stop using the oxidizer by mid June two months ago in a past update, but an unexpected spike in the air influent caused us to continue running it (the June sampling air sampling event). However, we are expecting data from Mr. Horton any day now that will document that we are now able to turn off the oxidizer. I believe the last sample that Argus collected was likely below the allowable level of 13.7 lbs/day. When the data and recommendation are received I will expedite the review and email the consultant permission to discontinue use of the oxidizer. I assume this will occur this month. After it is turned off, the rest of the system will remain on and the oxidizer will be moved to another site (in Brevard County). Also, the propane tank will be removed.
General System Status:
We have had some down time in the last month or two due to iron precipitation in the groundwater recovery and treatment processes. Argus requested the use of a chemical solution (AN-310FG, a food grade sequestrant) to keep the iron from precipitating out of solution and therefore reduce the backpressure of the pumping of the treated water. From conversations with David Jones, the county professional engineer, Argus will need to justify this further before it will be allowed. The approval for this may be somewhat of the same process as was used to get the oxidizer in place.
GW recovery portion:
Since no report has been submitted to document focused treatment (the 24 multiphase extraction wells), we are not able to report on which of the treatment wells will be turned off and which will remain in operation. As stated in previous updates, we believe that the use of focused treatment to hone in on the areas with the most contamination is the best approach as some of the key wells have cleaned up and other ones remain above GCTLs. The area to focus on is the area near MW-5. So far, focused treatment has not commenced.
The soil vapor extraction portion:
During recent field visits I noticed that the amount of moisture being captured during the SVE process had reduced. As long as the gauge on the moisture separator was indeed functioning correctly and from my visible inspection of the SVE flow gauges on the 28 MPE vapor gauges, it looked very encouraging. By reducing the vacuum, less upwelling is occurring and therefore less water is being pulled through the vapor stream. That’s a good thing because as water occludes the well screens, less vapors are extracted. All of the flow scale labels on the SVE flow meters have since been replaced as they had gotten sun damaged. As stated in the last update, the focused treatment (Vapor recovery) may apply on this portion of the system as well, and may be independent of the focused treatment of groundwater recovery.
The next milestone data will soon be ready. They sampled all the wells last week including a couple of new wells to better define the plume to the east. I thought I would have this data in time for today’s update, but I have not received the data. I look forward to giving you the next update on September 1, 2008. Please feel free to call me anytime if you need additional information or if you would like me to find something in our files.
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