Conference Call Minutes from January 26, 2005

State Coalition for Remediation of Drycleaners

State Coalition for Remediation of Drycleaners
Conference Call

January 26, 2005


• Pam Wilson
• Crystal Collins
• Wendy Cohen
• Ray Frigon
• Jo Johnson
• Bill Linn
• Pat Eriksen
• Mike Perkins
• Juho So
• Allen Dotson
• Kären Kromar
• Dale Trippler
Florida (SCRD Chair)
• Ken Koon
• Dianne Thomas
• Dick DeZeeuw
• Lisa Appel
• Craig Dukes
• Richard Haynes
• Steve Goins
• Mike Leckie
• Meade Anderson
• Terry Evanson
• Jeff Soellner
North Carolina
South Carolina
South Carolina
South Carolina

Also participating in the State Coalition for Remediation of Drycleaners (SCRD) conference call were Carolyn Perroni of Environmental Management Support, Inc., Cheryl Joseph of the National Ground Water Association (NGWA), and Christine Hartnett from ERG.


Bill Linn said that he was sad to announce that two valued SCRD members, Wendy Cohen and Dale Trippler, would be leaving the group soon. Cohen indicated that she is leaving her position within the Central Valley Regional Water Quality Board's cleanup division to work on issues pertaining to irrigated agriculture. Until she finds someone to replace her as SCRD's California representative, Cohen said, she would like to remain on SCRD's email distribution list. Trippler said that he plans to retire from state service on March 1. He said that he will be involved with drycleaner-cleanup-related consulting work in the future, and would be interested in continuing his interactions with SCRD. Both Cohen and Trippler wished SCRD members the best. They said they had enjoyed working with the group, and that they thought much had been accomplished in the short time SCRD has been in existence. Call participants wished Cohen and Trippler well and thanked them for their years of service.


Craig Dukes said that the Technical Committee is currently involved with the following:


Pat Eriksen said that several people provided comments on the Committee's summary report on the "resource allocation" discussion that took place at the fall 2004 meeting. He agreed to take these comments into account before redistributing the summary.


The Spring 2005 SCRD Meeting
The next SCRD meeting will be held in spring 2005 in North Carolina. Cheryl Joseph said that NGWA cannot finalize plans for the meeting at this point because NGWA's conference-support agreement with EPA expires on March 31, 2005. Nevertheless, Joseph said, she has started looking into possible venues in Raleigh and Chapel Hill.

Linn said that he plans to start developing a draft agenda for the meeting, and he asked for input on what should be included. The following components were discussed:

Policy Change—Relevant for All Future SCRD Meetings
The PowerPoint presentations delivered during SCRD meetings are converted to PDF files, included as attachments to the meeting summary reports, and posted to the SCRD Web site. For past reports, ERG (the contractor that prepares the summaries) has contacted all of the meeting speakers individually to obtain permission to post the PowerPoint presentations. Dukes advised changing the policy to the following: SCRD will assume that it is acceptable to post PowerPoint presentations unless the speaker explicitly indicates otherwise. Call participants agreed that this policy change is acceptable as long as speakers are fully aware that the policy exists. Joseph agreed to incorporate information about the new policy in all meeting invitations that are distributed in the future.


Call participants discussed the following miscellaneous topics:


Richard Haynes provided information about an ozone sparging remediation system that has been installed at the Former Market Place Shopping Center Site in Hilton Head, South Carolina. Haynes said that a drycleaner was located at this site at one time, but that it has been torn down and replaced with a supermarket. Providing some background information, Haynes noted that: (1) PCE concentrations have been detected in the ground water at concentrations as high as 15,000 ppb, (2) contaminant hotspots are located in the vicinity of the MW-2 cluster (which marks the location of a former drycleaning machine) and the MW-4 cluster (which marks the location of a former dumpster), and (3) contaminated ground water has migrated toward an expensive housing development and has also entered a drainage canal. In an effort to address these problems, South Carolina's Department of Health and Environmental Control (DHEC) chose to hire KV Associates, Inc. (KVA) to design an ozone sparging remediation system for the site. As part of the design process, KVA determined how large the system should be, where sparge ports should be located, and how frequently the sparging system should operate.

The system became operational in the spring of 2002, but several operational problems arose during the first 6 months. Haynes said that the problems were finally corrected, but that KVA provided little help in resolving them. Once the system became fully operational, PCE concentrations started to decrease steadily. In fact, samples collected in January 2003 suggested that PCE concentrations had dropped to 700 ppb. In January 2004, however, a PCE spike of 3,000 ppb was detected. DHEC identified two possible explanations for the spike: (1) remediation activities caused some of the subsurface NAPL to volatilize and/or (2) the small amount of ozone injected could not overcome the site's natural oxygen demands. To alleviate these problems, DHEC decided to adopt a more aggressive sparging schedule than the one originally proposed by KVA in the two hotspot areas (i.e., the MW-2 and MW-4 cluster areas). Making these changes promoted conditions more conducive to contaminant destruction and drove the PCE concentrations downward again. Despite these positive changes, DHEC has determined that even more needs to be done to drive the environment toward more complete contaminant destruction; toward this end, DHEC has decided to run the system 24 hours a day and 7 days a week in three sparge ports that are located in the two hotspot areas. The hotspot areas are now being monitored on a monthly basis to determine how this intensified sparging schedule impacts dissolved oxygen levels, ORP levels, and PCE concentrations. Monitoring is also being performed in the perimeter wells to evaluate whether elevated contaminant concentrations are entering offsite areas. Some PCE breakdown products have been detected in the perimeter wells, but the concentrations remain under Maximum Contaminant Levels.

Haynes concluded with two notes about the remediation system:

One call participant asked Haynes about operation and maintenance costs. Haynes said that the energy costs associated with the system are about $300 per month, and that monitoring costs have averaged about $45,000 per year. He noted that the monitoring costs are particularly high because DHEC is using the site as a test site, and is therefore performing more monitoring than might be necessary. To reduce some of the monitoring costs, he said, DHEC has started introducing the Color-Tec screening process (which is less expensive than more conventional laboratory analysis methods) into the monitoring approach. The Color-Tec method allows DHEC to obtain information on PCE trends. Then, once a year, ground-water samples are collected and sent to a laboratory to obtain precise data on PCE concentrations.

Linn said that Kansas has also used KVA's ozone sparging systems to address some of its drycleaning sites, and he encouraged call participants to visit the SCRD Web site for information on Kansas' experience. Linn also noted that Florida is using ozone sparging to address a site, though KVA has not been involved with that particular system.


Call participants set the following as tentative dates for the next three SCRD conference calls: March 17, April 28, and June 9. Linn asked SCRD members to mark these dates on their calendars. Dukes said that technical presentations will be included at the end of each of these SCRD conference calls. For the March 17 call, Frigon will present information about innovative assessment work at a fractured bedrock site.