Assignment 4 (1)

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University of Alberta *

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526

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Civil Engineering

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Dec 6, 2023

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D EPARTMENT OF C IVIL & E NVIRONMENTAL E NGINEERING U NIVERSITY OF A LBERTA C IV E 526 S OIL R EMEDIATION F ALL 2022 A SSIGNMENT 4 – Soil Vapor Extraction Due: Saturday, November 19, 2022, at 11:59 PM Submission Information: Upload your completed assignment to eClass. The file should be a PDF with this file as the first 3 pages. Please use the format “LastName Unit 1 Assignment” for the filename. Note that eClass will automatically cut off submissions at 11:59 PM. Question Value Grade 1 7 2 15 3 16 Overall presentation 1 5 Total 43 1 Note: Overall presentation grades are provided for adequate citations, referencing, proper use of units, organization, and neatness. 1. You are given the following information for a SVE field test: Pressure at the extraction well = 0.88 atm Pressure at a monitoring well 30 ft away from the extraction well = 0.98 atm Diameter of the extraction well = 4 inches (a) Determine the radius of influence (R I ) of the SVE extraction well. You can assume the pressure at the radius of influence is 1 atm. State any additional assumptions and comment on this value of radius of influence. (b) Calculate the pressure at monitoring wells 3, 30 and 80 ft away from the extraction well. (c) Plot the pressure profile in the subsurface from the extraction well to a distance R I . 2. A soil is contaminated with a fuel oil and a SVE project is proposed. (a) Determine the contaminant removal rate at the beginning of the SVE project.

(b) Determine the minimum clean up time for the site (e.g., the time needed to reduce the concentration to the required clean up level). Why is the calculated clean up time a minimum clean up time? (c) Sketch a graph of the contaminant (fuel oil) concentration in the air exiting the extraction well as a function of time. Explain the trend depicted. (d) Discuss this clean up time (is it long? short? about right?), and describe any other factors you would need to take into consideration. Do you have any recommendations? You are given the following data for the site: SVE pilot test data: Assume one SVE extraction well is used. Pressure at the extraction well = 0.9 atm Pressure at a monitoring well 23 ft away from the extraction well = 0.98 atm Diameter of the well = 4 inches Permeability of the formation = 0.1 Darcy Well screen length = 20 ft Air viscosity = 0.018 centipoise Temperature = 20°C Soil properties: Porosity = 0.35 Organic content of the soil = 0.01 Degree of water saturation = 40% Dry bulk density of the soil = 1.8 g/cm 3 Site Properties: Volume of contaminated soil = 180 m 3 Initial concentration in the soil = 7000 mg/kg dry soil Required clean-up level = 50 mg/kg dry soil Fuel oil properties: There are no properties for this specific fuel oil. You may assume that the fuel behaves like n- dodecane (C 12 H 26 ). 3. A leaking underground storage tank has discharged 10 m 3 of 1,1,1-TCA to a sandy soil. The contaminant was found to extend over a diameter of approximately 30m and at a depth of 10m, beginning at a depth 2m below the ground surface (see Figure 1). SVE was selected as the clean- up technology for the site. Figures 2 and 3 provide data from pilot testing to determine the appropriate extraction airflow rate. You are given the following information about the site: Soil wet bulk density = 2090 kg/m 3 Kd (for 1,1,1-TCA) = 10 -5 m 3 /g Porosity = 0.25 Degree of water saturation = 40% (a) Based on the pilot testing data, which extraction airflow rate would you choose? Explain. (b) Estimate the time necessary to remove 95% of the 1,1,1-TCA.

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