–Forwarded Message Attachment–
Subject: Monthly update for Sellers Auto / Artist Studio petroleum cleanup site 489201547 / 489201548 (Nineteenth update- June 2, 2008 )
Date: Mon, 2 Jun 2008 14:52:51 -0400
I would like to take this opportunity to give you our Nineteenth monthly update on the project.
There are currently no reports in house for the County to review and the next one expected is due on or before July 1st. Although not due this month, I expect it will be received early this month. That report will cover the operational period of the beginning of February through the end of April. I expect the run time that Argus will report will be pretty good since we haven’t had a lot of down time notifications lately. From conversations with Mr. Horton, I understand we are closer to being able to turn off the oxidizer. In fact, Mr. Horton told me today that the last vapor sample did indeed indicate that we have reached the acceptable levels where the oxidizer may be shut off. Argus is asking that we get the results confirmed and approved by the County in the next two weeks. Mr. Horton will put some calculations in the report to show what the mass (lbs per day) is from the soil vapor extraction portion of the system. Pending our receipt of this data, it be shut off in about two weeks. To be more specific, I estimate the date the oxidizer will be turned off will be approximately June 16th (the only reason this may be delayed is the next set is above the prescribed level allowed of 13.7 lbs per day). Most of the data in the upcoming report will be from the same set that was presented during the April Lake Formosa Neighborhood Association. While Argus is wrapping up this report, we are about a third through the next reporting period, which is due in October.
General System Status:
As noted above , the system is running pretty much 24 hrs per day, 7 days per week. We had some down time reported last week for which Argus is looking into. Orange County discovered it wasn’t operating last week, but Argus got it up and running again the same day it was reported to them. Also, on April 22nd, a hose connection broke and caused treated groundwater to be discharged into the air outside of the liquid phase carbon vessels outside the remediation building (inside the fence).
GW recovery portion: Since progress has been seen in the areas were many of the 24 multiphase extraction wells are, but some contamination lingers in other areas, a focusing of treatment can be expected to hone in on the areas with the most contamination. From our recent inspections it appears that the flow is pretty high (higher than the 1.5 gallons per minute per MPE well design) and the total volume of groundwater recovered and treated is greater than 2.5 million gallons based on the totalizer readings on the recovery wells. Since the system ran on and off for several months before that, it is reasonable to assume the volume of groundwater recovered to date is greater than the sum total of the totalizers, which equals about 2.5 million gallons as of May 15, 2008. I will ask Argus to calculate this in all future reports (the amount recovered per period, and total to date). Groundwater recovery from MPE #15, 16, 18 & 21 had ceased as noted in our last inspection. Argus will have to make a professional recommendation on which locations will be turned off to hone in on the areas with the lingering contamination, and if we concur with it, implementation of the focused treatment (GW recovery) can occur. We would expect that by pulling less or no water from areas already cleaned up, that a higher volume of water may be pulled from the areas we want to focus on, at least in most cases.
The soil vapor extraction portion: The total flow during the May 15th site visit was approximately 605 standard cubic feet per minute, which may be as good as can be achieved without capturing too much water and diminishing the effectiveness of recovering vapors. The total design (operating all wells) for vapor flow is about four times higher than that. However, too much water capture seems to be a result of trying to achieve the higher flows. As water occludes the well screens, less vapors are extracted. We noted during our last inspection that SVE wells 1, 8, 13, 14, 16, 20 & 24 didn’t have any vapor flow. Most of the flow scale labels on the SVE flow meters need to be replaced as they are sun damaged and hard to read. Argus will have to make a professional recommendation on which locations will be turned off to hone in on the areas with the lingering contamination, and if we concur with it, implementation of the focused treatment (Vapor recovery) can occur.
I think the next milestone data will be available in August 2008. In the meantime, we will review the recommendations in Argus’ reports for system enhancements that may hasten the cleanup of MW-5, the most contaminated monitoring well left.
I look forward to giving you the next update on July 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, Suncom 356-1480, Fax (407) 836-1417