Technology Status Report: In Situ Flushing - CLU-IN

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In Situ Flushing Project Summaries GWRTAC Case Study Database GWRTAC ID: FLSH0034 Project Name: Peak Oil Co./Bay Drum Co., Tampa, FL City: Tampa State/Province: FL Primary GWRTAC Personal Communication Source (Name/Organization): Project Summary: Randal Chafins U.S. EPA Report(s)/Publication(s) (GWRTAC Source): U.S. EPA, Nov. 1996: Innovative Treatment Technologies: Annual Status Report (Eighth Edition), EPA 542-R-96-010, Number 8, U.S. EPA OSWER (5102G) TIO, Washington, DC The following text is from notes from April 1997 conversation with EPA RPM and Internet URL EPA.gov: Treated site groundwater would be used as flushing solution; nutrient additives are being considered. In situ flushing project is in early design phase, and will be conducted within a slurry wall containment area. The depth of the confining layer is approximately 15 feet below the ground surface. ROD estimates five year duration for flushing project; remediation must continue until groundwater standards are achieved. Current plans are to infiltrate water through horizontal piping network. Report(s)/Publication(s) (Additional Information Sources): U.S. EPA, Nov. 1996: Innovative Treatment Technologies: Annual Status Report (Eighth Edition), EPA 542-R-96-010, Number 8, U.S. EPA OSWER (5102G) TIO, Washington, DC Ground-Water Remediation Technologies Analysis Center Operated by Concurrent Technologies Corporation Appendix - Page 70 of 164 Copyright GWRTAC 1998 Revision 1 Tuesday, November 17, 1998
In Situ Flushing Project Summaries GWRTAC Case Study Database GWRTAC ID: FLSH0035 Project Name: Picatinny Arsenal, NJ City: Picatinny Arsenal State/Province: NJ Primary GWRTAC Personal Communication Source (Name/Organization): Project Summary: Jim Smith University of Virginia Report(s)/Publication(s) (GWRTAC Source): Ground-Water Remediation Technologies Analysis Center (GWRTAC), 1996: Surfactants/Cosolvents, Technology Evaluation Report TE-96-02, Dr. Chad T. Jafvert, Purdue University, for GWRTAC, Pittsburgh, PA, December 1996, available at www.gwrtac.org Rice University, 1997: Technology Practices Manual for Surfactants and Cosolvents, Rice University, 6100 Main Street, Houston, TX 77005-1892, February 1997 U.S. Environmental Protection Agency (EPA), April 1995: Status Report: Surfactant Enhancements, EPA 542-K-94-003, U.S. EPA OSWER (5102W), TIO, Washington, DC, available at www.gwrtac.org. The following was excerpted from Ground-Water Remediation Technologies Analysis Center (GWRTAC), 1996: Surfactants/Cosolvents, Technology Evaluation Report TE-96-02, Dr. Chad T. Jafvert, Purdue University, for GWRTAC, Pittsburgh, PA, December 1996, available at www.gwrtac.org and U.S. Environmental Protection Agency (EPA), and April 1995: Status Report: Surfactant Enhancements, EPA 542-K-94-003, U.S. EPA OSWER (5102W), TIO, Washington, DC: The Picatinny Arsenal is a USGS National Research Site, having been selected as such in 1986. The site is located on a golf course. At Picatinny Arsenal, TCE was used for years as degreasing solvent, and contaminated the sand and gravel aquifer at concentrations of about 1 to 5 mg/kg with aqueous phase concentrations of 1 to 5 mg/L. The water table is ten feet below the ground surface. A ten to 15 feet thick lower confining unit is 50 feet below the surface. A pump and treat system was installed as an interim remedy at this Superfund site; wells are installed to a depth of approximately 20 feet above the confining layer. For this project, surfactants were injected to cause desorption of TCE from soil and the increase of TCE levels in groundwater were monitored. The treatment area for the small-scale field test was 60 x 20 feet. The test site is upgradient from the existing pump and treat system; pump and treat systems thus removed the surfactant and TCE. Previous laboratory work was completed to determine type and concentration of optimum surfactant to use for flushing pilot project. Wells were installed and tracer tests conducted to confirm hydraulic control of test area. Three injection wells, 10 ft apart, were installed perpendicular to the natural gradient and tangential to the pump-and-treat extraction well, approximately 100 yards down-gradient. One monitoring well is located 30 ft up-gradient and three monitoring wells located down-gradient at 10 ft intervals from the injection wells. Clean water was Ground-Water Remediation Technologies Analysis Center Operated by Concurrent Technologies Corporation Appendix - Page 71 of 164 Copyright GWRTAC 1998 Revision 1 Tuesday, November 17, 1998
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Technology Status Report Technology
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ABSTRACT This technology status rep
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LIST OF TABLES Table Title Page 1 I
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1.0 INTRODUCTION / PURPOSE OF STATU
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a laboratory-scale project. As illu
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3.1 Flushing Solutions 3.0 ANALYSIS
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(approximately eight) full-scale pr
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Table 1. In Situ Flushing - Summary
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Table 3 In Situ Flushing - Geology
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Table 4 In Situ Flushing - Recovere
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Full-Scale/Commercial 26% Figure 2.
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Site Remediation 25% Figure 4. In S
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NAPL Removal 34% Figure 6. In Situ
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Figure 8. In Situ Flushing - Distri
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Number of Projects 35 30 25 20 15 1
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Number of Case Studies 45 40 35 30
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25 ft and 50 ft and 10 ft and 100 f
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Unconfined Aquifer 65% Figure 16. I
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In Situ Flushing Project Summaries
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Page 67 and 68: In Situ Flushing Project Summaries
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