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Site Name: Dana Structural Manufacturing, LLC Site Address: 1550 Industrial Drive, Stockton, California Year of Initial Development: 1993/1994 Summary of Phase I Environmental Site Assessment (ESA): In January 2010, ENVIRON conducted a Phase I ESA of the Dana Structural Manufacturing, LLC (Dana) facility in Stockton, California, which has been operating a truck frame manufacturing facility since 1993/1994. Prior to development, the site was used for agricultural purposes. The Phase I ESA identified the following recognized environmental conditions (RECs) and other areas of potential environmental concern at the site: • Potential Discharges from Below-Grade Sumps (Other Finding)—The facility maintains an approximately 5,415-gallon below-grade sump that provides secondary containment capacity for tanks in the on-site wastewater treatment plant. In addition, the facility maintains several smaller blind sumps throughout the facility that serve as secondary containment for chemical storage areas. • Prior Release Incidents (de minimis) —The facility has reported several past release incidents to regulatory authorities. These incidents were reported between 1997 and 2007 and generally involved releases of oil or oily water, paint resin, glycol, smoke dust, and water-based paint in quantities ranging from about 25 to 1,000 gallons. • Floor Staining (de minimis)— ENVIRON observed minor to heavy floor staining at various locations within the building, particularly in the wastewater treatment area and near the dip/coating area. Staining did not appear to extend to cracks or drains. • Damaged Hazardous Material Containers (de minimis) —At several locations, ENVIRON observed raw materials (e.g., hydraulic oil) and waste materials (e.g., used oil filters, used oil) stored in 55-gallon drums that were significantly dented. • Historical Agricultural Use of the Property (de minimis) —The site may historically have been used for agricultural purposes prior to its industrial development in 1993/1994. The former use of agricultural chemicals at the site cannot be ruled out. Conceptual Phase II Scope of Work: The scope of work described herein will be used to evaluate soil and groundwater conditions in the above areas. Task 1 — Investigation Planning Prior to conducting any subsurface work at the site, ENVIRON will mark all investigative locations in the field and will retain a private utility locator to clear boring locations within the Property boundary. Prior to initiating drilling activities at the Property, ENVIRON will also notify Underground Services Alert (USA), which will clear utilities at the Property boundary. It is expected that the required drilling permit may take one to two weeks to be issued following submittal of a work plan, permit application, and fees to the local agency. To address worker safety requirements, ENVIRON will prepare a project-specific health and safety plan for the investigation prior to initiating the subsurface work at the Property. All subcontractors are responsible for their own health and safety. 1