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MGP Treatment System Operation & Maintenance

MGP Treatment System

Project Overview

LocationPelham Manor, NY
Duration60 Months
Contract Value$1M - $5M
GWTT RoleOperate & Maintain

Project Description

GWTT took over operation & maintenance and project management of a groundwater treatment system, non-aqueous phase liquids (NAPL) recovery system, and two sub-slab depressurization systems located on a former manufactured gas plant (MGP) site. The MGP treatment system was constructed to address residual product remaining from production at the site through 1968.

The treatment system operates at a flow rate of 30 GPM and consists of five groundwater extraction wells, eight product recovery wells, two recovery trenches, a NAPL holding tank, active odor extraction, oil water separation, equalization and mixing, metals precipitation, bag filtration, organo-clay media filtration, liquid phase carbon filtration, and secondary bag filtration. System effluent is discharged to surface water. Additionally, there are two active sub-slab depressurization systems installed to prevent the migration of sub-slab vapors to an existing nearby shopping center.

Specific contaminants treated include:

  • Total Suspended Solids (TSS)
  • Oil & Grease
  • Total Petroleum Hydrocarbons (TPH)
  • Volatile Organic Compounds (VOC)
  • Semi-Volatile Organic Compounds (SVOC)
  • Polychlorinated Biphenyls (PCB)
  • Benzene / Toluene / Ethylbenzene / Xylene (BTEX)
  • Total Metals

GWTT’s scope of responsibilities includes: routine system operation, preventative maintenance, daily recordkeeping and documentation, regulatory agency reporting, waste management, subcontractor management, operation & maintenance of the sub-slab depressurization systems, site health and safety program, and responsibility for delivering a final effluent that meets all regulatory requirements.

To date, GWTT has maintained the MGP treatment system in a manner that has continuously met runtime requirements, regulatory compliance, and health & safety goals.

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