Information Update, November 2002
What's Happening at the William Dick Lagoon Site?
The U.S. Environmental Protection Agency (EPA) is overseeing work to cleanup the William Dick Lagoon Site . This site was formerly used to dispose of rinse water used to clean tank trucks that hauled hazardous compounds such as petroleum, latex, and various resins. The cleanup work is being done under the authority of EPA's Superfund program.
Where is the Site Located?
The William Dick Lagoon Site (the Site) is located in West Caln Township, Chester County, Pennsylvania, approximately 3.5 miles south-southeast of the Village of Honey Brook. The Site covers 4.4 acres within a 105-acre parcel of land lying south of Telegraph Road and west of North Sandy Hill Road. About 2 acres of the Site were once covered by unlined waste water lagoons.
What's EPA Doing There?
EPA began studying the Site in 1985. In 1991, EPA determined that the best way to address the site was to divide the work into Operable Units (OUs) that could be studied and implemented separately. The same year, EPA signed a Record of Decision (ROD) for OU1, residential water use, and OU2, ground water study and temporary treatment. In 1993, a ROD was signed to address contaminated soil which is the source of the contaminants that are getting into the ground water. In 1995, EPA entered into a Consent Decree with Chemical Leaman Tank Lines(CLTL) whose tank washing liquids had caused the site contamination. CLTL was directed to design and conduct the cleanup work required by the RODs under EPA's guidance. Recently, Quality Distribution Inc. (QDI) bought CLTL and assumed responsibility for completing all remaining work. Work on OU1 is finished. EPA is currently overseeing work on OU2 and OU3.
- 1950s - 1970
- Industrial waste liquids accepted at the site.
- Pennsylvania Department of Health (PADOH) ordered lagoons to close
- EPA sampling finds Site soils and 2 wells contain hazardous organic compounds.
- Additional wells and spring-fed water supplies found contaminated.
- Site putonNational Priorities List.
- EPA and Chemical Leaman Tank Lines, Inc. (CLTL) entered into Consent Order. CLTL installed a fence around the Site and filter systems on home wells that exceeded safe drinking water standards.
- CLTL agrees to perform a Remedial Investigation and Feasibility Study of the Site.
- EPA signs Record of Decision to extend a public water supply line, conduct a hydrogeologic study, and conduct an interim groundwater pump and treat program to help determine final ground water cleanup.
- EPA signs Record of Decision to remediate site soil using on-site thermal desorption treatment.
- EPA enters Consent Decree with CLTL requiring firm to design and implement 1991 and 1993 Records of Decision. CLTL is also agreed to pay EPA for work performed by the Agency, as well as to construct a water line extension. CLTL also had to pay a penalty for violating an EPA order.
- EPA signed an Explanation of Significant Difference allowing cleanup of the underlying soil at the site using soil vapor extraction/biodegradation treatment.
- EPA completes design for the public water line extension.
- EPA issues an Explanation of Significant Differences (ESD) that establishes a Corrective Action Management Unit for the soil clean up project.
- CLTL completed the hydrogeological study. The results of the study will be used in the design of the interim groundwater treatment system.
- EPA completed construction of the public water line extension and completed connection of 115 homes to the public water system.
- CLTL completed construction of the five extraction wells for the interim ground water treatment system.
- EPA conditionally approves 95% design for the soil cleanup project for the site.
What is Being Done for OU2 (Ground Water)?
QDI completed a hydrogeologic study of conditions below the ground and the effect they have on ground water. Now, QDI is using the study results to design an interim ground water treatment system. Plans to discharge the treated water to Indian Spring Run have to be re-evaluated, however, because the Pennsylvania Department of Environmental Protection upgraded the classification of this stream. Various plans are currently being considered; when an appropriate discharge method is identified, the design will be completed. EPA expects the design will be completed during 2003. After the system is built, it will be operated for several years. Then, the effectiveness of the treatment system will be evaluated, and a final plan for long-term ground water cleanup will be identified.
What is Being Done for OU3 (Contaminated Soil)?
EPA has recently approved QDI's pre-final (95%) design for the soil portion of the site cleanup plan. In keeping with the 1993 ROD, the top soil and remaining lagoon sludge material, which are the most contaminated materials at the Site, will be cleaned using a on-site thermal desorption process. Less-contaminated underlying soils will be cleaned using a combination of technologies called soil vapor extraction/bioremediation (SVE/BIO) treatment. If the final design is completed and approved as planned, soil cleanup activities could begin in March of 2003.
- Thermal desorption is... a process which uses heat to separate volatile organic contaminants from soil and sludge. As the contaminated materials are heated, the contaminants change into vapors and become part of the gas stream in the air moving through the treatment unit (the desorber). The gas stream, including the contaminants go to a post-treatment system where the contaminants will be processed further.
- Soil Vapor Extraction (SVE) is... a network of dry wells to which a vacuum is applied. The vacuum continuously pulls air through the contaminated soil, causing the volatile contaminants to vaporize. As the vaporized contaminants separate from the soil particles, they are pulled by the vacuum system into a collection or treatment unit.
- Bioremediation (BIO) is... a process that uses microorganisms that are common in the local environment to degrade chemicals in the soil. When the SVE unit pulls air through the soil, it stimulates bacterial (microorganisms) growth. The bacterias' metabolic processes (eating, digesting and eliminating waste products, breathing) speed up the degradation, or breakdown, of contaminants. Nutrients may also be added to the soil to speed up the biodegradation process or make it more efficient.
If started as planned, thermal desorption could be completed in the fall of 2003. Then, the SVE/BIO portion of the cleanup will begin. The SVE/BIO portion of the clean up will be operated for 18 months with progress evaluated after 9 months of operation. QDI must achieve the soil cleanup standard within 18 months after beginning the SVE/BIO treatment. If the cleanup standards can not be met within this time, SVE/BIO will be stopped, and thermal desorption will be used to achieve the appropriate cleanup level.
Status of OU1, Residential Water Use
The work for OU1 is finished. It involved extending a public water line approximately three-quarters of a mile along Sandy Hill Road between Woodlawn Drive and Telegraph Road. Homes along this route were given the opportunity to connect to the water line at EPA's expense to ensure they had a safe household water supply. One-hundred-fifteen homes accepted EPA's offer and are now connected to the public water system currently operated by the PA American Water Company.
For Additional Information
Additional information about the William Dick Lagoon Site is available at:
West Caln Township Building
Route 340 West (Kings Hwy.)
US EPA Region III
Superfund Records Center
1650 Arch St.
Philadelphia, PA 19103-2029
Interested parties may also contact:
Community Involvement Coordinator
Remedial Project Manager
You're Invited to an Open House!
Thursday, November 21, 2002
3:00 - 5:00 p.m. & 6:30 - 8:30 p.m.
Wagontown Fire Hall
416 West Kings Highway
Learn About Cleanup Progress at the William Dick Lagoon Site in West Caln Township
Join the U.S. Environmental Protection Agency (EPA); Pennsylvania Department of Environmental Protection (PADEP); Quality Distribution Inc. (QDI), the current site owner; and QDI's contractors, to learn about the work that is being done to clean up this site. The focus of the Open House will be on current efforts to complete and implement a plan to clean contaminated soils. The soil treatment plan requires a combination of treatment technologies, including thermal desorption, soil vapor extraction, and bioremediation. Please plan tojoin us to learn how these technologies will work to protect you and your family.