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Limited Subsurface Investigatio„ Alork Plan 0 908 East Scotts Avenue C� Stockton,California a ntea g ro u p Antea Group Project No. UPR82572 • The subject property included manufacturing operations from at least the late 1800s to the present,such as agricultural implement manufacturing, truck and tractor repair, machining, woodworking, furniture manufacturing, and helicopter rotor blade repair, among others. Operations such as these typically involve the handling of petroleum products and hazardous substances and generation of related wastes. Available hazardous waste disposal documentation dates back only as far as 1982. Additionally, a historical map dated 1972 showed the storage of "volatiles" in a building on the south boundary of the property, indicating that hazardous materials were stored on the site at that time. • At the time of a November 2011 site reconnaissance, historical features observed (reportedly unused at present) on the site included a former dust collector and unused piping in a pit/trench beneath it (these features are located on the eastern side of the 902 E. Scotts Avenue building), and a former oil/water separator (or similar feature) located in the warehouse portion of the 908 E. Scotts Avenue building. Former operators or duration of usage of these features is not known. • The Phase I ESA reported the site as a listed generator of state-regulated wastes (Rotor-Tech International, 902 E. Scotts Avenue), as well as a small-quantity generator of EPA hazardous waste (Composite Technology, Inc., 902 E. Scotts Avenue). Site tenant Rotor-Tech International's operations included use of a large paint booth that, according to available information, has been in place since at least 1974. They also prepare rotor blades for painting and finishing in a room next to the paint booth. Features in this room include a naphtha degreaser, flammables storage (e.g., paints), and hazardous waste storage. Antea Group personnel also noted the presence of potential former(plugged)floor drains in this room. Information regarding Composite Technology, Inc.is unknown. 3.0 SITE INVESTIGATION 3.1 Pre-field Activities Antea Group has prepared a Health and Safety Plan (HASP) in accordance with Title 8, Section 5192 of the California Code of Regulations. The HASP(Appendix A) contains a list of emergency contacts, as well as a hospital route map to the nearest emergency facility. All field personnel will conduct a daily review of the HASP and modify it with any site-specific updates or changes in conditions. Prior to drilling,Antea Group will mark all proposed soil test boring locations and will contact Underground Service Alert North(USA)to clear the boring locations of public-owned underground utilities. In addition,Antea Group will contract an independent locating service to clear the boring locations of private subsurface features or other obstructions. The private locate will utilize a ground-penetrating radar(GPR) to locate subsurface features,which will also be helpful in identifying any unknown or unreported subsurface features or PECs (see Section 3.2.1, below). Also prior to subsurface soil sampling, Antea Group will obtain all necessary permits and approvals from the San Joaquin County Environmental Health Department (SJCEHD), which should follow submittal of the following 2 www.anteagroup.com