Dam Emergency Action Plans (EAPs) in Connecticut

dam-eaps
Quillinan Reservoir Dam

Tata & Howard has prepared numerous dam emergency action plans (EAPs) for Connecticut dams in accordance with CT DEEP regulations. Between 2015 and 2017, we have completed 52 EAPs for significant and high hazard dams throughout Connecticut. Our clients have included municipalities, private dam owners, and the CT DEEP. The EAPs include the following:

  • Preparation of an inundation map and flood inundation summary table for the EAP based on the dam failure analysis. The inundation maps include the limits of potential flooding (LoPF), selected cross sections, estimated time to peak stage, and the water depth at selected locations within the LoPF. For dams with no dam failure analysis, Tata & Howard prepared inundation maps for a hypothetical dam failure using hydrologic routing techniques.
  • Preparation of a list of roads and addresses at risk and subject to flooding based on the inundation map.
  • Preparation of dam monitoring procedures including identifying the persons responsible as well as procedures for monitoring the dam during periods of heavy rain and runoff, or when conditions develop that warrant closer monitoring, such as increased or new seepage, cracking, settlement or sabotage. The EAP provides dam specific information to assist the dam owner or operator in determining the appropriate emergency level for the event.
  • dam-inspections
    Papermill Pond Dam

    Preparation of a formal warning notification procedure to alert the local authority responsible for acting on a warning or determining whether to evacuate residents and businesses within the inundation area after an unusual or emergency event is detected or reported at the dam.

  • Preparation of notification flow charts with emergency contact information of federal, state, and local agencies that are responsible for providing emergency services. The flow charts depict the order and circumstance under which the contacts should be notified. The EAPs also include a list of other emergency services contacts, such as the National Weather Service and local media, as well as the addresses of the local emergency operations center (LEOC) and shelters available to residents during an emergency per CT DEEP requirements.
  • Black Pond Dam in Meriden, CT

    Preparation of a termination procedure for ending monitoring and response activities once the emergency is over.

  • Preparation of criteria to review and update the EAP at least once every two years, or more frequently as necessary to reflect significant changes to the dam structure or downstream area, including verification of contacts in the emergency notification charts. The criteria also include guidance for the dam owner to conduct an exercise or test of the EAP concurrent with the review.
  • Preparation of aerial, location, and watershed maps for the dam.

Environmental Services, Wilmington, MA

environmental-servicesTata & Howard has been providing environmental services for a Site in Wilmington, Massachusetts for several years. The contaminants of concern at the Site are chlorinated volatile organic compounds (CVOCs). The CVOCs were detected in June 1994 as part of a due diligence assessment for bank financing, and the sources of the CVOCs are from prior operations at the Site that utilized chlorinated solvents to clean electronic parts. These compounds were released to the environment through improper disposal and leakage from the equipment that was used onsite.

Remedial activities were performed at the Site to reduce the concentrations of CVOCs in soil and groundwater, and in August 2000, a Class C Temporary Solution Response Action Outcome (RAO) was filed with the Massachusetts Department of Environmental Protection (MassDEP), which concludes that there was no substantial hazard to human health, safety, public welfare, or the environment caused by the contamination at the premises. That conclusion is based on appropriate assessment, testing and analyses, and includes a Method 3 Risk Characterization, which supports those findings. In August 2005, and again in August 2010 and September 2015, the Class C RAO was renewed based on the conclusion that there was, as of the date of each renewal, no substantial hazard caused by the contamination at the premises.

In May 2015, T&H filed a Release Abatement Measure (RAM) Plan for the installation of a sub-slab depressurization system (SSDS) at the Site as part of a Permanent Solution in accordance with MassDEP’s regulations. Based on more recent data, six points and radon type fans were installed in an effort to develop a negative pressure field beneath the western portion of the building. T&H also installed a remote telemetry system equipped with an alarm that will notify MassDEP, Tata & Howard, and the owner of the building if the SSDSs fail as the result of loss of power, mechanical issues, or other disruption of the system.

The building is primarily comprised of office and commercial warehouse space, and an Activity and Use Limitation will be implemented as part of the Permanent Solution to prohibit more sensitive uses in the future, such as daycare or residential.

Environmental Services and Dam Inspection in MA

Larkin Lumber DamIn November 2015, Tata & Howard provided peer review on work that had been completed at a former lumber mill, and all documentation that had been prepared to date was reviewed. The primary concern was an area where pressure treated lumber had been stored, as the lumber was treated with chromated copper arsenate and the residual arsenic concentrations in soil were very high. The previous recommendation was to put a deed restriction (specifically, an Activity and Use Limitation or AUL) on the area to limit the exposure. Because the planned future use for the property is to convert the existing mill building into residential condominiums, this approach was inadequate. In an effort to find a more suitable solution, T&H obtained and analyzed additional soil samples from this area and found that less than 200 cubic yards had been affected. The contaminated soil can be removed for under $30,000 and will bring residual concentrations below that allowed for residential use.

Because the mill is located on a brook, a filing with the local Conservation Commission was required.  T&H suggested that, due to the limited work being done and the fact that the affected area is separated from the brook by a retaining wall, an Abbreviated Notice of Intent (ANOI) would be sufficient. The Conservation Commission agreed, and the ANOI was approved at a Public Hearing. T&H is currently in the process of preparing a Release Abatement Measure (RAM) Plan, which must be submitted to the MassDEP prior to excavation.

During the first onsite project meeting, T&H noticed a dam located in front of the mill building which the client acknowledged was out of compliance and would likely result in financial penalties. T&H contacted the Department of Conservation and Recreation (DCR) and requested an extension for the completion of the dam inspection, assuring DCR that the inspection would be completed in a timely manner.  DCR agreed to waive the penalties, and the inspection report was completed in January 2016.

UST Removal in Massachusetts

UST removalTata & Howard provided environmental services to a private client relating to the removal of three fuel oil underground storage tanks (USTs) in Massachusetts. The project included observation of excavation activities associated with the removal of the USTs, collection of soil samples in accordance with the Massachusetts Department of Environmental Protection’s (MassDEP’s) UST Closure Assessment Manual, and screening for total organic vapors (TOVs) with a photoionization detector (PID).  We then prepared a summary letter, which included a summary of activities performed, and conclusions and recommendations with regard to Massachusetts General Laws c. 21E and the Massachusetts Contingency Plan.

CHALLENGE: Lead contaminated soil at site in Franklin, MA

CLIENT: Private client in Franklin, Massachusetts

PROJECT: Brownfield remediation

THE CHALLENGE: The Town of Franklin, MA planned to develop a site to be used by the Parks & Recreation Department. However, several potential environmental concerns were identified at the site.

THE SOLUTION: Based on information provided by the Town, Tata & Howard performed subsurface evaluation services to assess the potential presence of oil and hazardous material in soil and groundwater at the site, including the following:

  • Evaluated the site and found contaminated fill material under the building;
  • Evaluated the significance of our findings with respect to Massachusetts General Law c.21E and the Massachusetts Contingency Plan 310 CMR 40.0000; and
  • Prepared a Subsurface Evaluation Report for the site, which included a summary of activities performed, site figures and data tables, and conclusions and recommendations.

T&H then coordinated the removal of the lead contaminated soil, which contained hundreds of battery casings. The soil was treated onsite to stabilize the leachable lead, then transported to the Turnkey Landfill in Rochester, NH for disposal.

PROGRESS: Since it has been remediated and the Brownfield is now a Greenfield, the Town has purchased the site and begun renovating for future use as an indoor recreation facility. T&H filed a Permanent Solution report with the Massachusetts Department of Environmental Protection (MassDEP) in October 2015.

CHALLENGE: Mission Critical Storage Tanks, Southeast Louisiana Veterans Health Care System, New Orleans, LA

hospital new orleans
State-of-the-art SLVHCS in New Orleans, LA, is on track for silver LEED certification

CLIENT: NBBJ, Columbus, Ohio

PROJECT: Mission critical storage tank systems for Southeast Louisiana Veterans Health Care System (SLVHCS)

THE CHALLENGE: SLVHCS is the successor to the VA Medical Center, which was decimated by Hurricane Katrina in 2005. The new hospital requirements included green building practices and resiliency during natural disasters, including the ability to remain operational for at least five days with enough provisions and accommodations for up to 1,000 staff and patients in case of a major disaster.

The atrium of Southeast Louisiana Veterans Health Care System
The atrium of SLVHCS

THE SOLUTION: Tata & Howard provided design and construction administration services on specific components of the mission critical storage tanks, which include a domestic water tank, sewage holding tank, cooling tower process and bleed water tank, and fire protection water tank. Our design of specific components of the mission critical tanks included coating, waterproofing, mixing, pumping, bacteria control, odor control, venting, piping to five feet outside the tanks, and instrumentation and control. Specific design elements for resiliency and green design included the following:

  • Domestic Water Tank system instrumentation/controls include storage tank level measurement and control of inlet/outlet valves. The system also includes ultraviolet disinfection of all potable water pumped from the storage tank into the hospital.
  • Sewage Holding Tank is waterproof and its control system to provide automated response to an event using electrically actuated valves that direct the sewage from the gravity system to the holding tank. After the event, the system will turn the pumps on and transfer the sewage to the City’s system. A water spray system will automatically wash down the empty tank.
  • Cooling Tower Make-up Water Tank is waterproof and its control system design provides electrically actuated valves to receive rainwater from the building roof drains, condensate from the buildings, and potable water from the City’s water system. The Cooling Tower Make-up system instrumentation/controls include tank level measurement and control of inlet/outlet valves.
  • Cooling Tower Bleedwater Tank is waterproof and its control systems design provides electrically actuated valves to accept water from the cooling towers, recycles water to the cooling towers, and pumps it into the municipal sewer system. The Cooling Tower Bleedwater Tank system instrumentation/controls will include tank level measurement and control of inlet/outlet valves.
  • Fire Protection Water Tank is waterproof and its control system design provides electrically actuated valves to automate control of receipt of water from the CEP/Warehouse roof drains and the City’s water system.
  • The instrumentation and controls for all of the above elements are capable of communicating with the facility ‘s SCADA system.

PROGRESS: The new state-of-the-art facility opened on August 1, 2015, and the building is on track to receive LEED silver certification. For comprehensive information on the new hospital, please click here.

CHALLENGE: VOC Mitigation, Framingham, MA

ssds mitigation fan and manometer
Close up of completed SSDS mitigation fan and manometer.

CLIENT: Former Commercial Dry Cleaner, Framingham, MA

PROJECT: Remediation of chlorinated solvents from former dry cleaning operations

THE CHALLENGE: At this former wholesale dry cleaner, the client spent over $250,000 installing an asphaltic barrier and new floor over the barrier in an effort to prevent volatile organic compound (VOC) vapors from affecting indoor air quality.  This system was recommended by a prior consultant who subsequently found that the barrier did not sufficiently reduce the vapors in the indoor air to make the building safe for reuse.

THE SOLUTION:  T&H recommended sub slab depressurization systems (SSDSs), which are similar to radon systems, to redirect the vapors from beneath the building to the atmosphere.  The cost of four SSDSs was $10,000 and the VOCs in the indoor air were reduced to negligible concentrations. T&H then assisted the client as an expert witness to recover costs from the prior consultant and their installation contractor.

PROGRESS: Site closed out and the property has been sold.

Hazardous Waste Services, Newton Centre, MA

Newton Centre soil gas plot dueling dry cleanersTata & Howard has completed a variety of hazardous waste services for a private client in Newton Centre, MA. Work included completion of the Immediate Response Action (IRA) Completion Report and Response Action Outcome (RAO) as well as obtaining indoor air samples and submitting the results to the Department of Environmental Protection (DEP) every two years. Tata & Howard also prepared and submitted Post Class-C RAO Status Reports. This involves documenting the operational status of the sub-slab depressurization systems (SSDSs) and obtaining and analyzing groundwater from three key wells to evaluate whether conditions have changed. The Status Reports are required every six months.

In addition, Tata & Howard completed the installation of a telemetry system, preparation of an Activity and Use Limitation (AUL), preparation of a Permanent Solution with Conditions (PSC) report, annual inspection of the sub slab depressurization systems (SSDSs), and the replacement of a monitoring well cover. The work included updating the existing SSDSs in accordance with anticipated revisions to the MCP by adding an alarm system designed by Tata & Howard equipped with remote telemetry able to notify the the consultant, clients, tenants, and MassDEP in the event of a system failure. The work also included a metes and bounds land survey.

Tata & Howard also performed work to comply with the revised Massachusetts Contingency Plan (MCP) and developing the data necessary to support a Permanent Solution for the release of chlorinated solvents at the Site. The work included the installation of five additional soil gas monitoring points at the Site and the collection of the data. These points were required to collect additional soil gas data to evaluate whether vapor migration has been controlled. The samples were submitted for laboratory analyses. Also, Tata & Howard collected groundwater samples from seven key monitoring wells using low flow sampling. The groundwater from the wells were measured for pH, temperature, dissolved oxygen (DO), oxidation-reduction potential (ORP), specific conductance, and turbidity. This project is ongoing.

Massachusetts Contingency Plan (MCP) Assessment, Franklin, MA

IMG_2590Tata & Howard performed a Massachusetts Contingency Plan (MCP) Assessment in Franklin, Massachusetts. The assessment included passive soil gas sampling at the Site and abutting properties to identify possible sources of chlorinated volatile organic compounds and further evaluate the approximate horizontal extent of these compounds. We then evaluated the laboratory data to identify potential additional source areas and estimated the extent of contaminants detected by the passive soil gas samples. In addition, we created plume maps for each of the contaminants that were detected, and provided a summary and opinion letter with recommendations.

Standpipe Rehabilitation, University of Southern Maine

University of Southern Maine, Gorham, ME

USM standpipe rehabilitationTata & Howard provided engineering services to the University of Southern Maine related to the interior and exterior rehabilitation of a welded steel water storage tank. The standpipe was constructed in the 1950’s and is approximately 30 feet in diameter and 105 feet tall with a capacity of 0.55 million gallons. The scope of services included preparing Contract Documents for the cleaning, interior abrasive blasting, exterior pressure washing, and interior and exterior coating application. The project also included coordination with two cellular companies and incorporation of corresponding design considerations into the Contract Documents. Additional design considerations included providing the USM logo on the tank exterior, repairing foundation cracks and gaps, extending the overflow pipe and installing a flapper, screen, and concrete splash pad, providing safety climb system for exterior access ladder, replacing the roof vent, and installing a new roof access hatch. Tata & Howard provided bid assistance, construction administration services, and full time construction observation. Since the standpipe is located on a college campus, the time frame for completion was limited to summer break, but the standpipe rehabilitation project was completed within budget and on schedule.