SITE INFORMATION AND CORRESPONDENCE_2001-2005

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• CALIFORNIA REGIONAL WATER QUALITY CENTRAL VALLEY REGION ORDER NO. R5-2003-XX XX 03 JUN 12 PM 12= 37 i WASTE DISCHARGE REQUIREMENTS FOR LINCOLN CENTER ENVIRONMENTAL REMEDIATION TRUST LINCOLN CENTER SAN JOAQUIN COUNTY The California Regional Water Quality Control Board Central Valley Region, (hereafter Regional / Board) finds that: 1. The Lincoln Center Environmental Remediation Trust (hereafter"Discharger") is responsible fora administering a site cleanup fund, established pursuant to the settlement of a lawsuit in the United States District Court, Eastern District of California, for the remediation of contaminated soil and groundwater. The contamination resulted from the release to the environment of dry cleaning chemicals (primarily perchloroethene or PCE) at the Lincoln Center Shopping Complex in Stockton, California. The project site is shown on Attachment A, a part of this Order. The project site plan is shown on Attachment B, a part of this Order. 2. The Discharger submitted a Report of Waste Discharge (ROWD) and a"Bench Scale Treatability Study and Pilot Study Work Plan, Historical Source Area on March 21, 2003 fora proposed in-situ groundwater remediation pilot study. 3. The Discharger currently operates a soil vapor extraction system (SVE) and a groundwater extraction and treatment system at the site. The SVE system consists of 35 SVE wells located in the area of highest concentrations of PCE in the soil gas. The contaminated soil is gas is extracted under vacuum and treated by vapor phase granular activated carbon. The system presently operates at 2009 standard cubic feet/min with an influent PCE vapor concentration of 500 ppbv(04/2003). To date, the SVE system has removed over 6500 pounds of PCE from the vadose zone. The groundwater extraction and treatment system consists of 23 extraction wells in the shallow zone of the aquifer (the "A" zone) and 10 extraction wells in the next deeper zone of, T the aquifer (the`B" zone). The extracted groundwater is treated by air stripping and is then \♦/ discharged to the storm drain pursuant to WDR Order#98-062 (NPDES #CA0084255). The system presently operates at 230 gallons/minute with an influent PCE concentration of 850 ug/1 (03/2003). To date, the groundwater extraction and treatment system has removed over 2825 pounds of PCE from groundwater. The current maximum PCE level in groundwater is 9500 ug/1 measured in a sample from a monitoring well in the historical contaminant source area(CHMW- 003A, 12/2002). I 4. Investigations at the site indicate that the relatively higher concentrations of PCE are present in groundwater in the low-permeability sediments beneath the historical contaminant source area. The low-permeability sediments reside in the upper portion of the uppermost water-bearing zone. i