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Q Limited Phase 11 Subsurface Investigation Report 902-908 East Scotts Avenue Stockton,California a ntea g ro u p Antea Group Project No. UPR82572A 2.2 Previous Environmental Activities In February 2012, Antea Group completed a Phase I ESA for the subject site. The report concluded that industrial development of the subject property and surrounding area occurred prior to 1895 and the subject property's usage included various industrial operations for well over 100 years, including the following (all dates are approximate): • Prior to 1895 to 1920s—agricultural implement manufacturing (Houser & Haines Manufacturing Co. and The Holt Manufacturing Co.). • 1920s to late 1950s—truck and tractor or implement repair and manufacturing. Original buildings were razed sometime during this period,and newer buildings were constructed. • Late 1950s to present—various truck/tractor or agricultural implement repair facilities, a helicopter blade repair shop, machine shops, and other miscellaneous commercial and industrial operations, including furniture manufacturing and glass repair. The recent Phase I ESA revealed recognized environmental conditions (RECs), as defined by the American Standard for Testing and Materials(ASTM)standard E1527-05. Those RECs are summarized as follows: • The subject property included manufacturing operations from at least the late 1800s to the present. Operations of that nature typically involve the handling of petroleum products and hazardous substances and generation of related wastes, a conclusion supported by a historical map dated 1972 showing the storage of"volatiles" in a building on the south boundary of the property. • At the time of a November 2011 site reconnaissance, historical features observed on the site included a former dust collector and unused piping in a pit/trench beneath one building and a former oil/water separator in another building. • The Phase I ESA reported recent and past site tenants as listed generators of state-regulated wastes or small-quantity generators of EPA hazardous waste. Some waste generation was related to current operations, which include use of a large paint booth that (since at least 1974), and painting/buffing/finishing operations including use of a naphtha degreaser, flammables storage (e.g., paints), and hazardous waste storage. 2.3 Limited Phase II Soil Sampling Scope Antea Group implemented a limited soil sampling scope in general accordance with their January 20, 2012 Proposed Wye Track Property Acquisition: Change Order#1 letter and the Limited Subsurface Investigation Work Plan prepared for San Joaquin County dated March 23, 2012. Antea Group proposed supplemental site reconnaissance, utility clearance and GPR survey, and installation of up to 20 soil borings on the subject property to assess potential contamination at locations identified as RECs. The general areas of the identified RECs and actual boring numbers and locations are shown on Figures 2 and 3, respectively. Antea Group also recommended soil testing at a number of locations in areas where no specific REC was identified in order to complete an overall 2 www.anteagroup.com