Service: Facility Operations and Maintenance
Project: Charles George Landfill Superfund Site Operations and Maintenance
Client: U.S. Army Corps of Engineers, New England District
Site Location: Charles George Landfill, Tyngsboro, MA
Period of Performance: 2008 - 2009

H&S provides routine and non-routine long term operations, maintenance and monitoring support to a former uncontrolled landfill site in Northern Massachusetts. This 69-acre closed landfill consists of two pump stations with extraction wells, chemical feed systems, an effluent monitoring station, a flare for methane gas control and a main control building. The groundwater extraction and chemical feed systems are monitored by a SCADA system using Intellution FIX software that records flow, pH, and temperature data on the site computer.

As part of this long term response action, H&S performs routine maintenance and compliance sampling to ensure collection, treatment, and POTW discharge of landfill effluent and groundwater. On a weekly basis we perform a visual inspection of the landfill cap and security fence. We also monitor use of conditioning chemicals to prevent malfunction of the discharge system. Extraction well operation is maintained on a weekly basis to ensure collection and discharge of the landfill effluent and groundwater. Pumps are removed from extraction wells on a quarterly basis for preventative cleaning and maintenance.

On a quarterly basis we collect water samples for testing to ensure discharge water complies with the Lowell Regional Wastewater Utility Industrial User Permit. Grab and 24-hour composite samples are collected and analyzed. The sample results along with quarterly flow data are self-reported to the Utility.

H&S sampled and drained the onsite 5 acre lagoon in anticipation of demolition of the lagoon prior to transition of LTRA activities to the MA DEP in September 2009. In addition, the computer and SCADA systems are being upgraded to allow remote access to respond to site alarms when there are system malfunctions.

• Ongoing preventative maintenance has increased the uptime of extraction wells by >50%
• Optimization of chemical conditioning of effluent discharge has decreased chemical usage by 35%