| Site Type: Long Term/National Priorities List (NPL) |
Map this site in Cleanups in My Community
| Gray,  Maine|
| Cumberland County
| Street Address: ||MAYALL RD |
| Zip Code: || 04039 |
| Congressional |
| EPA ID #: ||MED980524078 |
| Site ID #: ||0101027 |
| Site Aliases: |
| Site Responsibility: ||Federal, State, Potentially Responsible Parties |
| NPL LISTING HISTORY |
| Proposed Date ||12/30/1982|
| Final Date ||09/08/1983 |
The 7-acre McKin Company site is located in a rural residential area about two miles east of the center of the Town of Gray. The site formerly operated as a sand and gravel pit that had been excavated to depths of 6 to 20 feet below the land surface. The facility opened in 1965 for storage and disposal of liquid wastes. The facility expanded in 1972 to accommodate waste generated when a Norwegian tanker ran aground on a ledge in Hussey Sound (a shipping channel leading into Portland harbor) spilling 100,000 gallons of industrial fuel. Between 1965 and 1978, the plant handled and disposed of a mixture of solvents, oils, and other chemicals. Approximately 100,000 to 200,000 gallons of waste are thought to have been processed annually. Operating facilities included an incinerator, a concrete block building, an asphalt-lined lagoon, and storage and fuel tanks. Wastes also may have been disposed of by spreading them over the ground surface. As early as 1973, residents of East Gray reported odors in well water and discoloration of laundry. In 1977, the Town of Gray and EPA confirmed that contaminated groundwater had reached many of the local private wells. These water supplies were capped, and the Farmers Home Administration trucked in water supplies. The public water system was extended to the affected area in 1978, and all residents were connected to it. The nearest residence is located 300 feet northeast of the property.
Threats and Contaminants
The groundwater is contaminated with volatile organic compounds (VOCs) including trichloroethane (TCA) and trichloroethylene (TCE). The soil was contaminated with VOCs, petrochemicals, and heavy metals including arsenic, lead, and mercury. Surface water and groundwater beyond the McKin property are also contaminated with VOCs. There is no known current exposure of residents to the groundwater, since all residents are connected to the public water supply.
The March 2001 ROD Amendment changed the cleanup approach for groundwater. The 1985 ROD selected active remediation through groundwater pump and above-ground treatment to achieve the goal of groundwater restoration. With the determination that it was technically impracticable to use active remediation to achieve this goal, the March 2001 ROD Amendment selected overlapping institutional controls and long-term monitoring to maintain protectiveness of human health. The ROD Amendment also included an engineered covering of an area known as Boiling Springs to prevent exposure to contaminated water by environmental receptors, and a contingency remedy for the Royal River.
Response Action Status
|Initial Action ||In 1979, the State removed 33,500 gallons of wastes and 165 drums of oils and chemicals. From 1985 to 1987, the parties potentially responsible for site contamination removed 55-gallon drums from the site. A fence surrounding the process area facilities was repaired, and a similar fence was installed across the front of the facility to prevent unauthorized access. Monitoring wells were also installed. Other actions included cleaning the tanks, transporting the empty tanks off site for salvage, and transporting liquids and sludges off site for disposal. The State cleaned and removed all of the remaining aboveground tanks in 1985. |
|Soil || In 1985, the remedies selected by the EPA for soil contamination included aeration of the soil and off-site disposal of 16 drums. All of the selected cleanup remedies were completed by the potentially responsible parties in 1987. Thermal soil aeration reduced contaminant levels in 12,000 cubic yards of soils to safe levels. |
|Groundwater ||The remedies selected by the EPA for the cleanup of the groundwater included: installing a groundwater extraction, treatment, and discharge system; monitoring the groundwater and surface water to evaluate the effectiveness of the source control actions and off-site groundwater programs; and closing down the site by demolishing buildings, clearing debris, draining and filling in the lagoon, removing drums and other contaminated materials, fencing the site, and covering the site with soil and vegetation. The potentially responsible parties began cleanup in 1990 under EPA's and Maine DEP's supervision. Site closure activities and construction of the groundwater treatment system have been completed. Currently, the groundwater treatment system has been temporarily shut down while its effectiveness is being evaluated. Three drafts of a report evaluating the technical practicality of restoring the overburden aquifer and controlling the impact on surface water were submitted by the potentially responsible parties in 1996. In the spring 1997 EPA, Maine DEP, the potentially responsible parties and Community of Gray entered a mediated process to try and reach consensus for the future direction for the site. In November 1999, the mediation effort reached consensus for the site, which each party was to recommend to their respective entity. The ROD was amended in March 2001.|
With the ROD Amendment, the cleanup approach for the Site was changed from active extraction of groundwater to overlaying institutional controls to prevent exposure to contaminated groundwater and long-term monitoring of groundwater and the Royal River.
|2003 Five-Year Review ||The 2003 review found that the remedies were expected to be protective of human health and the environment upon completion and in the interim, exposures pathways that could result in unacceptable risks were being controlled. |
|2008 Five-Year Review ||The 2008 review concluded that the remedy, as modified in the 2001 ROD Amendment, was functioning as intended and was protective of human health relative to the groundwater pathway. However, as the potential vapor intrusion pathway was still being investigated at the time of the review, a protectiveness statement could not be made for that pathway at that time.|
The 2008 review also identified lack of institutional controls on the McKin property and the installation of additional wells selected in the 2001 ROD Amendment as issues that needed to be resolved.
|2008 Five-Year Review Addendum ||EPA issued an addendum to the 2008 review following the completion of the vapor intrusion pathway. The addendum noted that while there were some sampling results that were above EPA's screening levels, the human health risks were within EPA's acceptable risk range. With the detection of low levels of site-related VOCs in indoor air, the addendum recommended the pathway be reassessed during the 2013 five-year review. |
|Long-Term Remedial Action ||Monitoring of groundwater and the Royal River has continued since the 2001 ROD amendment. |
|2013 Five-Year Review ||The 2013 review (the fifth site review) concluded that short-term protectiveness has been achieved through overlapping institutional controls. However in order for the remedy to be protective in the long-term, the permanent abandonment of residential wells within the IC Zone needs to be completed. |
|Enforcement Highlights||In 1988, the EPA and the State finalized an agreement with over 320 potentially responsible parties to carry out the cleanup plan. In October 2001 an Amendment to the 1988 Consent Decree was lodged with the U.S. District Court. This Amendment was signed by the signatories to the original Consent Decree; US Department of Justice, EPA, Maine DEP, and the Settling Defendants. Following a thirty-day public comment period, the US DOJ filed a motion for entry with the court. The Amendment to Consent Decree was entered on December 6, 2001. |
All construction activities at the McKin Company site have been completed. Soil contamination levels have been reduced to established cleanup standards, and no longer pose a threat. Active groundwater pumping and treatment was suspended in October 1995. This suspension will become permanent once the Consent Decree Amendment becomes effective. Evaluation of the groundwater water quality suggests that the aquifers may fully reach the cleanup goals in forty to fifty years, with portions of the aquifers reaching these goals within the next ten years. Royal River water quality data indicates the State of Maine surface water standard for TCE has been met since 2008.
Current Site Status
In the Spring of 1997 EPA, Maine Department of Environmental Protection (DEP), the potentially responsible parties, and the Town of Gray entered into a mediated process to try and reach consensus for the future direction of the site. In November of 1999, an agreement in principle was reached. EPA issued an ROD Amendment in March 2001. The parties to the original 1988 Consent Decree have sent an Amendment to Consent Decree to US District Court to reflect the changes to the remedy and each party's responsibilities. With the entry of the Amendment to Consent Decree, the Settling Parties have implemented the components of the Remedial Action Work Plan according to the established schedule.
VOC concentrations in the groundwater continue to decrease such that the latest projection indicates the groundwater performance standards may be met around 2035 (versus the 2050 projection developed for the ROD Amendment).
Investigation of the potential vapor intrusion pathway was completed by EPA in 2009. No unacceptable risks were identified with this pathway; however, because low levels of site-related VOCs were detected in indoor air, it was recommended that this pathway be reassessed in the next five-year review (2013). Follow-up sampling was performed in 2013. No VOCs were detected in the indoor air sampling.
Links to Other Site Information
Newsletters & Press Releases:
Federal Register Notices:
Reports and Studies:
|Administrative Record Index, OU01 Record of Decision (ROD), July 22, 1985 (475 KB)   |
|Administrative Record Index, OU01 Explanation of Significant Differences (ESD), September 12, 1990 (294 KB)   |
|Administrative Record Index, OU01 Amended Record of Decision (ROD), March 3, 2001 (456KB)   |
|Administrative Record Index, OU02 Explanation of Significant Differences (ESD), July 3, 2014 (479 KB)    |
|Five Year Review Report, September 22, 1992 (735KB)   |
|Second Five Year Review Report, September 30, 1998 (810KB)   |
|Third Five Year Review Report, September 22, 2003 (1,329KB)   |
|Fourth Five Year Review Report, September 30, 2008 (5.7 MB)   |
|Addendum to Fourth Five Year Review Report, September 21, 2009 (312 KB)   |
|Fifth Five Year Review Report, September 30, 2013 (2.29 MB)   |
Gray Public Library, 5 Hancock Street, Gray, ME 04039
OSRR Records and Information Center, 1st Floor, 5 Post Office Square, Suite 100 (HSC), Boston, MA 02109-3912 (617) 918-1440
|EPA Remedial Project Manager: ||Terry Connelly |
|Address: ||US Environmental Protection Agency|
5 Post Office Square, Suite 100
Mail Code OSRR07-1
Boston, MA 02109 - 3912
|Phone #: ||617-918-1373 |
|E-Mail Address: ||firstname.lastname@example.org |
|EPA Community Involvement Coordinator: ||Emily Bender |
|Address: ||US Environmental Protection Agency|
5 Post Office Square, Suite 100
Mail Code: ORA01-1
Boston, MA 02109-3912
|Phone #: ||617-918-1037 |
|E-Mail Address: ||email@example.com |
|State Agency Contact: ||Rebecca Hewett |
|Address: ||Maine DEP|
State House Station 17
Augusta, Maine 04333
|Phone #: ||207-287-8554 |
|E-Mail Address: ||firstname.lastname@example.org |