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Learning Goal: I’m working on a environmental engineering discussion question and need an explanation and answer to help me learn.This problem is based on the Former Radiator Factory Site. Groundwater pump andtreat is being considered for containment of the source area (triangle shape on propertysouth of the railroad tracks). A single extraction well is proposed to capture and containa TCE plume at the northern property boundary. The aquifer can be assumed to beisotropic and homogenous. Depth to groundwater is approximately 15 feet, and depth tobedrock is approximately 36 feet below ground surface near the downgradient propertyboundary (unconfined aquifer thickness is 21 feet) with a hydraulic conductivity of2.4×10 -4 cm/s and a hydraulic gradient of 0.05 m/m (ft/ft). Assume that the designdrawdown at the extraction well is limited to 2 meters, and the extraction well diameter is12 inches.a) Estimate the pore volume of the source areab) Calculate transmissivity of the aquiferc) What extraction flow rate is required to contain the entire plume width?d) Where does the stagnation point occur downgradient of the extraction well?e) What is the capture zone width at the extraction well?f) What is the radial zone of influence of the extraction well?g) Provide a sketch of the zone of influence, the capture zone, and stagnation point.h) Estimated the number of contaminated pore volumes to be extracted by the systemto meet remedial goals of Federal Maximum Contaminant Levels (MCLs) with thefollowing maximum baseline concentrations and assuming linear sorption is theprimary retardation mechanism (assume bulk density of 1.65 kg/L and 1% for f oc ) TCE = 200,00 ug/L Cis-1,2-Dichloroethene = 12,000 ug/L Vinyl Chloride = 1,000 ug/Li) Using the flow rate calculated in Part C, how many pore volumes would be removedin one year. Estimate the number of years the pump and treat system will need tooperate to meet remedial goals.
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