The Taunton Municipal Lighting Plant (TMLP) is submitting the attached National Pollutant Discharge Elimination System (NPDES) Notice of Intent (NOI) for coverage under the Remediation General Permit (RGP). This application addresses dewatering requirements associated with excavations during removal of petroleum impacted soils. In addition to the application form, a site location map, groundwater treatment system flow diagram, groundwater quality data as well as the supporting laboratory data report are attached. TRC has collected a water sample that is considered representative of groundwater that will be extracted, treated and discharged to the Taunton River under a RGP permit. Groundwater quality results are summarized in the attached table and laboratory data sheets are attached to this submittal. Potential constituents of concern include total suspended solids, total petroleum hydrocarbons (TPHs), semi-volatile organic compounds (SVOCs), and metals. The proposed dewatering treatment system is designed to handle up to 50 gallons per minute (gpm) of dewatering effluent and is expected to periodically operate at rates ranging from 25 to 50 gpm, when required. The treatment system will consist of the following process components: 1) One trench dewatering pump and one transfer pump; 2) Fractionation tank for removal of suspended solids, settleable solids, and oil and grease present; 3) Bag filters for effluent polishing prior to granular activated carbon (GAC) treatment; and, 4) Two GAC filters connected in series
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