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SOIL VAPOR EXTRACTION WELL
FEASIBILITY STUDY: SOIL VAPOR SAMPLE ANALYSIS


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(470 Pages: Text + Illustrations)

As part of its Soil and Water Investigation conducted pursuant to California Code of Regulations Section 2725(f), the Responsible Party in a soil and groundwater contamination case at a former gasoline service station site conducted a feasibility study to evaluate vacuum extraction of contaminants from soil and groundwater as a remedy for actual or potential adverse effects of an unauthorized release.

This report describes the results of a Soil Vapor Extraction Feasibility Study which was conducted to determine whether soil vapor extraction could accomplish removal of contaminant mass at sufficient rates, such that if carried out over a longer time period the method would have the potential to achieve significant remediation. Parameters necessary for the installation of a permanent SVE system such as Radius of Influence (ROI; maximum distance from test extraction well at which magnitude of the measured vacuum is at least 1% of the vacuum applied at the test well), and a determination of the total number of SVE wells required in the final installation at the former gas station site, were estimated in this report from the data presented. MTBE Hydrocarbon Removal Rate, Efficiency of Contaminant Mass Recovery and Total Petroleum Hydrocarbon are also estimated from the data presented in this report.

CONTENTS

I. Summary
II. Analytical Methods

      A. EPA Compendium Method TO-15:
            1. Method Description
      B. Compendium Method TO-15: Method Protocol
            1. Soil Vapor Extraction Apparatus and Pilot Test Procedure
            2. Vapor Sample Collection in Summa Canisters
            3. Addition of Internal and Surrogate Standards
            4. Quality Control Samples
            5. Calibration Standards: Initial and Continuing
      C. EPA Compendium Method TO-3
            1. Method Description
            2. Initial and Continuing Calibration
            3. Quality Control Samples
            4 .Preparation of Soil Vapor Samples for Gas Chromatography
      D. Chain of Custody

III. Discussion

      A. Soil Vapor Extraction Step Test
            1. Test Well SVE-1
            2. Test Well SVE-2
            3. Test Well SVE-3
            4. Determination of Radius of Influence
            5. Number of SVE Wells
      B. SVE Constant Vacuum Pressure Extended Test
            1. Test Well SVE-3
            2. Hydrocarbon Removal Rate
      C. Vapor Sample 1-1
            1. Quantitation Report and Total Ion Gas Chromatograph
            2. Presence of Internal and Surrogate Standards
            3. Quantitation of Target Compounds
      D. Vapor Sample 1-2
            1. Quantitation Report and Total Ion Gas Chromatography
            2. Presence of Internal and Surrogate Standards
            3. Quantitation of Target Compounds
      E. Vapor Sample 1-3
            1. Quantitation Report and Total Ion Gas Chromatograph
            2. Presence of Internal and Surrogate Standards
            3. Quantitation of Target Compounds
      F. Vapor Sample 2-1
            1. Quantitation Report and Total Ion Gas Chromatograph
            2. Presence of Internal and Surrogate Standards
            3. Quantitation of Target Compounds
      G. Vapor Sample 2-2
            1. Quantitation Report and Total Ion Gas Chromatograph
            2. Presence of Internal and Surrogate Standards
            3. Quantitation of Target Compounds
      H. Vapor Sample 2-3
            1. Quantitation Report and Total Ion Gas Chromatograph
            2. Presence of Internal and Surrogate Standards
            3. Quantitation of Target Compounds
      I. Vapor Sample EX-1
            1. Quantitation Report and Total Ion Gas Chromatograph
            2. Presence of Internal and Surrogate Standards
            3. Quantitation of Target Compounds
      J. Vapor Sample EX-2
            1. Quantitation Report and Total Ion Gas Chromatograph
            2. Presence of Internal and Surrogate Standards
            3. Quantitation of Target Compounds
      K. Vapor Sample EX-3
            1. Quantitation Report and Total Ion Gas Chromatograph
            2. Presence of Internal and Surrogate Standards
            3. Quantitation of Target Compounds

IV. Mass Spectral Identification and Confirmation of MTBE, Ethylbenzene, Benzene and Xylenes in Soil Vapor Samples

      A. SVE Vapor Samples 1-1, 1-2, 1-3, 2-1, 2-2, 2-3, EX-1, EX-2, EX-3
            1. Soil Vapor Sample 1-1
            2. Soil Vapor Sample 1-2
            3. Soil Vapor Sample 1-3
            4. Soil Vapor Sample 2-1
            5. Soil Vapor Sample 2-2
            6. Soil Vapor Sample 2-3
            7. Soil Vapor Sample EX-1
            8. Soil Vapor Sample EX-2
            9. Soil Vapor Sample EX-3

V. Quality Control Testing: EPA Compendium Method TO-15

      A. Daily Analytical Batch #092507-MS3
            1. Method Blank
            2. Continuing Calibration Verification
            3. Laboratory Control Spike and Spike Duplicate
      B. Daily Analytical Batch #092607-MS3
            1. Method Blank
            2. Continuing Calibration Verification
            3. Laboratory Control Spike and Spike Duplicate

VI. Analytical Results: EPA Compendium Method TO-3

      A. Soil Vapor Sample EX-1
            1. Quantitation Report, Area Percent Report and Gas Chromatograph
            2. Quantitation of TPH in Soil Vapor Sample EX-1
      B. Soil Vapor Sample EX-2
            1. Quantitation Report, Area Percent Report and Gas Chromatograph
            2. Quantitation of TPH in Soil Vapor Sample EX-2
      C. Soil Vapor Sample EX-3
            1. Quantitation Report, Area Percent Report and Gas Chromatograph
            2. Quantitation of TPH in Soil Vapor Sample EX-3

VII. Quality Control Testing; EPA Compendium Method TO-3

      A. Daily Analytical Batch #092707-GC1
            1. Method Blank
            2. Continuing Calibration Verification
            3. Laboratory Control Spike and Spike Duplicate
            4. Laboratory Control Spike Duplicate
      B. Daily Analytical Batch #092807-GC1
            1. Method Blank
            2. Continuing Calibration Verification
            3. Laboratory Control Spike and Spike Duplicate
            4. Laboratory Control Spike Duplicate

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