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Work Plan BB&J has prepared the following Work Plan for San Joaquin County Environmental Health Department to include a site history as well as the purpose and the scope of the proposed investigation. Site History Based on information provided to BB&J from various sources to include a permit obtained in 2007 for this property, the site was most likely agriculture prior to 1942. From approximately 1942 to 1944 a magnesium plant was in operation manufacturing component airplane parts and incendiary devices. The plant reportedly was idle between 1945 and 1950 and magnesium processing activities resumed in 1951 for the Korean War. In the mid 1950s the site was leased from the government by Western Pyromet for the production of titanium. In 1960, the property was purchased by Max Rouse & Sons who was operated a retail flea market business Buyers Bargain Barn during the 1960s. Best Products occupied the property in the 1970's to 1980's where fertilizer and pesticides were reportedly stored, bagged and distributed. Beginning in the early 1980's until the late 1990's, Biorecycling Technologies, Inc and Weaver Industries operated a green waste recycling and mulching operation. Assieh Development Corporation reportedly purchased the property in 2001 and began to develop the site by demolishing old structures, installing site utilities including storm water drainage and grading a portion of the site for future buildings. There are several large stockpiles of soil-like waste material as well as material that may be leftover from the demolition of the existing structures. Scope of the Proposed Investigation Pre-Mobilization BB&J will write a site-specific Health and Safety Plan (HSP) to address the scope of work and specific COC's at the Subject Property, and in accordance with the requirements outlined in the Occupational Safety and Health Administration (OSHA) Standard 29 Code of Federal Regulations. The HSP will be prepared for use only by BB&J employees (i.e., it is not intended for reliance by subcontractors or any other party); however, during BB&J's field safety meeting, a copy will be made available for subcontractor review prior to initiating the fieldwork. BB&J will contact California's local utility-clearance service contractor(s) (i.e., Underground Service Alert (USA)— North at 1-800-227-2600) at least 72 hours prior to start of field activities to mark the locations of underground utilities at and/or adjacent to the Subject Property. Utilities on private property will 2 Three Embarcadero Center 13`�Floor,San Francisco,CA 94111