SITE INFORMATION AND CORRESPONDENCE_2008-2015

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Lincoln Village Shopping Center - 2 - Stockton, 2 -Stockton, San Joaquin County 5 August 2014 Based on the above information, the Central Valley Water Board staff finds that the impacted onsite source area soils have been satisfactorily mitigated and no longer present a threat to human health or the environment. Since the onsite source area soils were adequately characterized before, during, and after remediation, and the Trust completed remedial actions in accordance with staff-approved work plans and under the observation of Central Valley Water Board staff, the onsite source area soils warrant a NFA determination. Issues PCE was released to soil and groundwater from spills that occurred during operations and through breaks in sanitary sewer lines that serviced former dry cleaning facilities at the Site. PCE and degradation products are the primary constituents historically reported in the groundwater, soil, and soil vapor at the Site. Multiple phases of interim remedial activities have been implemented at the Site to reduce the concentrations of PCE and degradation products in Site soils and groundwater. Remediation and monitoring activities to reduce PCE and degradation products in groundwater are ongoing. Setting The Site is a retail shopping center of approximately 30 acres that is bounded on the west by Gettysburg Place, on the east by Pacific Avenue, on the south by Douglas Avenue, and on the north by Lincoln Elementary School. Benjamin Holt Drive runs east-west through the middle of the Site. Source Historical waste disposal practices and documented spills from dry cleaning facilities resulted in the contamination of soil and groundwater beneath the Site. Actions To date, several investigations and five phases of interim remedial actions (IRAs) have been implemented at the Site to reduce the concentrations of PCE and degradation products in Site soils and groundwater. • 1998 to Present: Groundwater Extraction & Treatment (Phase 1 IRA — ongoing) • 1999 to 2011: SVE (Phase 2 IRA) • 2002 to Present: Groundwater Extraction &Treatment Expansion (Phase 3 IRA — ongoing) • 2007 to 2009: Air/Ozone Sparging (Phase 4 IRA) • 2007 to 2008: Enhanced Reductive Dechlorination (Phase 5 IRA) Mass Removed Approximately 7,500 pounds of PCE have been removed from the source area soils. Extent Defined Yes. The extent of contamination in onsite source area soils are sufficiently defined and remediated. Remaining levels of PCE and any degradation products in groundwater are being