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FEASIBILITY STUDY 7th STREET AND MISSOURI AVENUE WATER QUALITY ASSURANCE REVOLVING FUND SITE PHOENIX, ARIZONA
Arizona Department of Environmental Quality, 212 pp, 2019
Former drapery cleaner activities from 1969 to ~1980 led to PCE, TCE, cDCE, tDCE, and VC contamination in the subsurface. In June 2018, as part of an early removal action, a soil vapor extraction (SVE) pilot study was initiated to decrease PCE contamination in the vadose zone near the former drapery cleaners. From start-up to May 3, 2019, the SVE system removed ~537 lbs of PCE and operated for 3,439 hours. In November 2018, a pilot-scale ozone sparging system was installed to remediate VOCs in groundwater. The system comprises an ozone sparge unit and two dual-nested ozone injection wells within the source area at the site. Six rounds of groundwater sampling conducted between November 7, 2018, and April 4, 2019, suggest positive remedial effect associated with the ozone treatment in areas downgradient of the source area. Near the source area, VOC reductions have been modest, likely due to continued source addition from ongoing dissolution of PCE from the vadose zone into the local area groundwater. http://static.azdeq.gov/wqarf/7thmiss_100919_fs.pdf
Former drapery cleaner activities from 1969 to ~1980 led to PCE, TCE, cDCE, tDCE, and VC contamination in the subsurface. In June 2018, as part of an early removal action, a soil vapor extraction (SVE) pilot study was initiated to decrease PCE contamination in the vadose zone near the former drapery cleaners. From start-up to May 3, 2019, the SVE system removed ~537 lbs of PCE and operated for 3,439 hours. In November 2018, a pilot-scale ozone sparging system was installed to remediate VOCs in groundwater. The system comprises an ozone sparge unit and two dual-nested ozone injection wells within the source area at the site. Six rounds of groundwater sampling conducted between November 7, 2018, and April 4, 2019, suggest positive remedial effect associated with the ozone treatment in areas downgradient of the source area. Near the source area, VOC reductions have been modest, likely due to continued source addition from ongoing dissolution of PCE from the vadose zone into the local area groundwater. http://static.azdeq.gov/wqarf/7thmiss_100919_fs.pdf
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