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LanI l"0ti i E �rsw' ' LandAmer92 Assessment Corporation 1920 Main Street, Suite 1200 CIrvine,California 92614 Commercial Services Phone:949-930-9103 Fax: 949-930-9087 November 16,2006 San Joaquin County Environmental Health Department 304 East Weber Avenue, 3`d Floor Stockton,CA 95202 RE: Work Plan for Environmental Investigation Stockton Industrial Park 1488-1625 Tillie Lewis Drive Stockton, California LandAmerica Assessment Corporation (LAC) will be completing an environmental investigation at Stockton Industrial Park at parcels 163-360-04 (Building 4), 163-360-05 (Building 5), and 164-360-10 (retention pond). Additionally,the rail road spur will be sampled. The sampling will be completed with a geoprobe drilling rig operated by RSI Drilling of Woodland, California. LAC professional associate, Fred Allison,P.E., will supervise the drilling activities. BACKGROUND INFORMATION The property is developed with six one-story warehouse-type buildings, asphalt-paved parking areas and exterior truck docks. A three-track covered rail spur extends along the eastern exterior of Buildings 2, 3 and 4. Buildings 1 and 2 (1604 Tillie Lewis Dr.) are occupied by Four Truckers Nationwide Express. Building 3 (1604 Tillie Lewis Dr.)is currently vacant although leased by Malnove, Inc. Building 4 (1488 Tillie Lewis Dr.) is occupied by American Door Manufacturing Company. Building 5 is occupied by Silgan Containers (1605 Tillie Lewis Dr.) and by Castle Metals (1625 Tillie Lewis Dr.). Building 6 (1505 Tillie Lewis Dr.) is occupied by Silgan Containers, Copperfield Chimney Supplies, Inc., and E-Z Vent Sheet Metal Products. A storm water retention pond is located between Building 6 and Tillie Lewis Drive. The current and historical storage and use of hazardous materials and the generation and storage of hazardous wastes including hydraulic oils, machine coolants, halogenated solvents, building maintenance materials and associated wastes have occurred in the manufacturing, waste storage, processing, and equipment areas of the property. Specific areas of concern include the hazardous waste storage area behind Building 5, the storm water retention pond, the glue machine steam cleaning area and rinse water interceptor at American Door Manufacturing Company (Building 4), and the historical operation of the BNSF Railway spur concerning suspected impact from hazardous substances associated with rail lines and even possible ballast dumping.