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Norwalk MGP Upper Yard Remediation Maxymillian Technologies (MT) excavated and removed over 8, 200 tons of subsurface deposits of coal tar and purifier wastes from the upper yard of this Former MGP. MT implemented regulatory accepted in-situ blending techniques that allowed MT to blend the hazardous material with non-contaminated on-site material during excavation operations to meet the strict disposal requirements. MT also installed a materials processing area, sheeting and shoring, decontamination stations, conducted pavement repairs, and water treatment. MT implemented extensive erosion control measures and installed a decontamination area, bituminous concrete lip curb, anti-tracking pad and temporary haul ramp. The temporary haul ramp along a rip rap slope provided access to the materials preparation area and allowed MT to maintain a steady flow of material to and from the site excavations. MT performed in-situ blending in 3-5 foot lifts using a backhoe to make the soil contaminant concentrations uniform. The soil was then tested for total benzene. After receiving certified laboratory results, along with specific approval by the disposal facility, MT loaded the waste into trucks for off-site disposal at a licensed disposal facility. If contaminant concentrations were too high, MT processed the soil through a crusher/shredder and screen to a 1" minus size. MT implemented extensive sheeting and shoring during excavations. MT installed a 75' diameter by 30' deep gas holder with concrete compression rings to support the sheeting. MT removed 8,200 tons of PAH and cyanide contaminated soil from within the rings. MT installed the shoring, completed excavation activities, and trucked fill from an approved off-site source. MT then removed the shoring and simultaneously backfilled and compacted the new material, returning the excavation to original grade. Maxymillian Technologies also provided a transportable Water Treatment System that treated the dewatering water from the excavations and surface run-off. Overall, MT treated approximately 20,000 gallons of contaminated water.
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above: MT designed concrete compression rings instead of steel bracing to support a deep MGP holder during contaminated soil removal. below: Processing soils for off-site disposal. 
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