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A unique aspect of SHA's capabilities is the design and installation of cost effective Supervisory Control and Data Acquisition (SCADA) systems for groundwater and soil remediation systems, landfill leachate pump systems, landfill gas extraction and treatment systems, and other types of electro-mechanical systems. We can design an instrumentation package, provide a cost-effective stand-alone control system with integral datalogging, human-machine interface (HMI) remote access software, and remote reporting and control capabilities, and integrate the system into sites nationwide. We have managed these systems locally from our offices in New England, Ohio, and the United Kingdom. The control systems automatically provide us and/or our clients with notification of alarm conditions, daily status reports via facsimile machine, and access to system data using standard dial-up modems. The capabilities of the control systems allow us to monitor and analyze data, as well as change the operating conditions and control logic of the systems from remote locations, thus saving considerable time and expense associated with system operation and maintenance (O & M).
Click here to view Application Note #1 (PDF)
Click here to view Application Note #2 (PDF)
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Leachate Consolidation Site
Solid Waste Disposal Facility - New England
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 SHA was commissioned to design a system to consolidate the leachate at a central location to simplify the transfer of leachate into tank trucks for off-site disposal. SHA included batch controllers in the design to provide the ability to blend leachate from the various sources in proportions necessary to keep up with variable leachate production from each location. The system includes 18 discrete inputs, 14 analog inputs, and 22 discrete outputs that monitor and control 8 electric submersible pumps, 7 electromagnetic flow meters, liquid levels in 7 USTs, the batch controllers, and overfill protection for the tank truck. Datalogging and remote access to monitoring and control functions was included in the control system.
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Remedial System Design
Corporate Recreation Center Water Supply - Southeastern New York
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 SHA was retained to design a drinking water treatment system to remove MTBE contamination from an on-site water supply well. The treatment control system design by SHA monitors the supply well level, the storage tank level, the distribution system water pressure, the intensity of the UV lamps, and controls the electric submersible well pump and the VFD for the water distribution pump. The control system includes proportional, integral, and derivative (PID) control of the VFD to allow the pump to respond to changes in the water pressure. The VFD-controlled pump generally maintains the water pressure within 5 to 10 pounds per square inch of the target set point. The control system also provides datalogging and remote access to monitoring and control functions.
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Landfill Gas Extraction and Treatment System Design
New England
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 SHA designed a 500 cubic feet per minute gas extraction and transmission system to address odor control concerns. The system was installed in an unlined landfill, and includes 5 drilled gas extraction wells, 6 connections to an existing subliner vent system beneath a piggybacked landfill expansion, and gas extraction from a perimeter collection drain system. Condensate is removed from the gas in a below-grade condensate knockout, and at a skid-mounted knockout, and the gas is burned at a utility flare. SHA also designed the control system that automatically operates the equipment, records the operating data, and provides remote notification of alarm conditions.
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Landfill Expansion and Closure Design and Permitting
New England and New York
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 SHA has a broad range of experience in the northeastern United States designing and permitting landfill expansions and closures. Senior partners in the firm were instrumental in the design and permitting of a 100-acre landfill, which involved not only providing phased grading development plans, but also included design of the leachate and landfill gas handling infrastructure, as well as providing a piggyback fill over an existing closed, clay capped facility.
SHA has provided design and permitting services at various facilities ranging from a 1-acre municipal landfill soil cap closure and 70-acre expansion in northern New England, to a 48-acre Subtitle D landfill expansion in western New York State. Many of the projects have included design of the leachate and landfill gas handling systems, including design of Supervisory Data Acquisition and Control (SCADA) systems.
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Contaminated Soil and Groundwater Cleanup
Brownfields Site - Northeastern Ohio
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 The site of a former commercial dry cleaning operation was redeveloped with a commercial retail center. Redevelopment depended upon remediation of perchloroethylene (PCE) in the underlying soils, and engineered controls to address concerns about the health and safety of store employees and customers. As part of the remedial design, we provided a control system that includes 7 discrete inputs, 8 analog inputs, and 13 discrete outputs. The stand-alone control system also includes the ability to remotely access the controller using dial-up modems for monitoring and controlling the system. Additionally, the control system includes datalogging capability, which is accessible both locally and remotely.
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