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Underground and Aboveground Storage Tank Services
- including -

Permanent Closure of Tank Facilities
Underground Storage Tank Facility Audits
Spill Cleanup Insurance or State Fund Assistance
Spill Prevention Control and Countermeasures Plans

Underground Storage Tank (UST) and Aboveground Storage Tank (AST) regulations specify design requirements for operating tank systems with the purpose to protect the public from the hazards posed by the leakage of flammable, combustible, corrosive, or toxic liquids, and to prevent environmental damage caused by leaking tanks. Releases associated with tank systems which are properly installed, operated and maintained, are rare. StoneHill can assist facility owners with preventing releases; however, should a release occur, StoneHill can provide the services needed to quickly get control of the situation and minimize environmental impacts.

StoneHill has extensive experience investigating and remediating releases from tanks, as well as dealing with insurance and state petroleum cleanup funds which may be triggered if a release is identified. StoneHill’s team of professionals can also audit facility design and operations, and coordinate tank facility upgrades where deficiencies are identified, prepare or update Spill Prevention, Control and Countermeasures (SPCC) Plans for AST facilities, and complete the requirements of permanent tank facility closure. StoneHill’s familiarity with state agencies allows us to develop and negotiate work plans which often save clients significant time and funds. StoneHill professionals have extensive knowledge of the individual state regulations and the agencies responsible for enforcing them. StoneHill also has established strong working relationships with many subcontractors who can provide timely and high quality specialty services as required.


A major advantage of using a consultant such as StoneHill to manage the tank closure process is the detail and quality of tank closure documentation generated. Such documentation must stand up to intense scrutiny by financial institutions, potential property buyers, and regulatory agencies. Additionally, if a release is identified during the tank closure, StoneHill can conduct the necessary investigations and implement cost effective cleanup solutions, thereby minimizing the inefficiencies and delays inherent in the transfer of project responsibilities to an environmental consultant from a tank closure contractor whose capabilities have been exceeded.StoneHill has provided tank closure management and oversight services for many industrial, commercial and residential clients. Ourtank closure professionals will provide the oversight and evaluation expertise
required so that the project is completed in accordance with regulatory requirements and subsurface conditions are properly assessed. StoneHill ’s field staff are certified by the International Fire Code Institute (IFCI) in the decommissioning of USTs. If the tank is found to have been leaking, StoneHill can address the complex regulatory and technical issues associated with soil and groundwater contamination, and vapor migration into buildings or subsurface structures.


Selected Project Summaries

Bulk Heating Oil Above Ground Storage Facility. Manchester, NH

StoneHill has assisted this bulk fuel facility for many years including completion of a Site Investigation associated with a release of heating oil, preparation of a SPCC Plan, preparation of recommendations for facility compliance upgrades, and assistance with spill release monitoring. StoneHill has worked with the facility owner to prioritize costly upgrades withthe goal of investing in upgrades which would contribute to the greatest minimization of environmental impacts should a spill occur at the
facility. StoneHill ’s Project Manager has developed a relationship of trust with the facility owner which enables the owner to rely upon StoneHill as its sole environmental consultant from facility design to spill response.

County Facility, Brentwood, NH

Because numerous UST and AST systems are operated at the county facility, the State of NH requested completion of a tank facility audit to assess compliance with state regulations. StoneHill conducted the audit and retained certified tank specialists to complete required UST and AST system repairs and upgrades. Revised tank registration forms were completed and SPCC plans were prepared for several tank systems. During the review of tank facility records, StoneHill identified
records and invoices for a No. 6 oil release response action conducted in 1989, which even though eligible, had not been submitted to the NHDES for reimbursement of remediation costs from the NH Petroleum Cleanup Funds. StoneHill prepared a reimbursement request using information pieced together from the available response action records and the County received a reimbursement check from the State of NH for more than $120,000. StoneHill continues to provide consulting services to the county facility associated with the No. 6 oil which still remains on the water table.

UST Discovery, Portsmouth, NH

During the course of completing a pre-purchase environmental due diligence site assessment of a commercial property with a professional office building, it was determined based upon review of historical City Directories that the site was operated as a gasoline station until the mid-1970’s. The former property owner who operated the gasoline station could not recall whether the gasoline USTs were removed or
closed in place by filling with sand. Therefore, a ground penetrating radar (GPR) survey was completed which confirmed the presence of at least one UST located partially beneath a new building constructed in the late 1970’s. Immediately following the GPR survey on the same day, several soil borings and monitoring wells were completed which also confirmed the presence of petroleum impacted soil and groundwater. The confirmation of the presence of a UST was critical to triggering access to the NH Petroleum Cleanup Funds, which would reimburse costs associated with investigation and remediation of the petroleum release and assist in allowing the sale of the property to proceed.

Historical Release Discovery, Central Massachusetts

During the dewatering of an excavation for the construction for an addition to a church, groundwater impacted with fuel oil entered the foundation excavation. Further investigation identified extensive soil and groundwater contamination, which was complicated by the soil excavation and dewatering completed for the foundation construction. The resulting remediation costs exceeded $100,000. Church officials determined that a fuel oil UST had been removed
ten years earlier. The only record available to document the UST removal was a report from the local fire department inspector which indicated “small holes noted in tank…. no odor or visible product in [excavation] hole”. As it turned out, there had been a significant release from the tank which when discovered eleven years later resulted in significant hardships on the church. This case highlights the risk of not engaging a qualified environmental professional to complete a thorough UST closure inspection. The closure oversight and documentation costs are often insignificant when compared the negative impacts of a UST closure without a comprehensive UST closure report being available or the later discovery of a release due to inadequate inspection of the UST excavation.



600 State Street, Suite 2
Portsmouth, NH 03801
Telephone: 603-433-1935
Toll Free: 1-800-639-4503
Fax: 603-433-1942

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