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Additional Site Assessment Report - January 2012 WARNER PROPERTY 520 North EI Dorado Street, Stockton, California INTRODUCTION The subject property is located at 520 North EI Dorado Street, Stockton, California, on the northeastern corner of the intersection of East Fremont Street and North EI Dorado Street. The property is a 0.780-acre, square-shaped parcel developed with an approximately 11,220 square foot building. The western portion of the building is single-level, while the eastern portion of the building has two levels. The building on the property is currently unoccupied. Historical occupancy research of the property identified the site as the former location of a gasoline station and, prior to the 1950s, a tannery. No records were identified that indicated any investigation had been performed at the site; either for the gasoline station or the tannery. On 10 November 2011, six soil borings (61 through 136) were advanced at the subject property, under San Joaquin County Environmental Health Department (SJCEHD) Permit SR# 63855. A copy of Permit SR# 63855 is provided herein. Borings 131 through B3 were advanced in the parking lot in the southwestern portion of the property, and borings B4 through 136 were advanced along the eastern property boundary; soil borings were advanced to depths of approximately 20 feet(132, B3 and 135) and 30 feet (61, B4 and 66) below surface grade (bsg). SOIL PROBE BORING ADVANCEMENT On 05 January 2012, four additional soil borings (V1, V2, B7 and 138) were advanced at the subject property. Borings were advanced under San Joaquin County Environmental Health Department (SJCEHD) Permit SR#064110 (Appendix A). Borings V1 and V2 were advanced at the southern edge of the building and borings 137 and 138 were advanced north of the building.Approximate locations of each of the borings is illustrated in Figure 1. Soil borings were advanced to depths of approximately 5 feet bsg (V1 and V2) and 30 feet bsg (137 and 138). Borings were advanced utilizing an AMS Powerprobe 9600 direct push drilling rig equipped with 1.25-inch diameter probing rods and sampling tools to specified depths. SOIL SAMPLE COLLECTION Soil samples were collected from boring B7 and B8 at 5-foot intervals using a 1.25-inch core sampling assembly loaded with one 2-foot acetate liner. After sample collection, the Advanced Geo Ene'ironmental,Inc.