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TERRAX Environmental Engineering and Consultinu, September 25, 2017 P-12315 OCT 11 REC'D Mr. Alex Osinski 520 El Dorado LLC 2700 Pacific Coast Highway 2nd Floor Torrance CA 90505 Re: Well Abandonment Work Plan- 520 North El Dorado Street Stockton, California 95202 Dear Mr Osinski, Terrax Environmental, Inc. (Terrax) is pleased to present this work plan to abandon soil vapor wells installed during a limited Phase II site investigation at 520 North El Dorado Street Stockton, California 95202 (subject site). The well abandonment presented below is being conducted in accordance with the requirements of San Joaquin County Development Title, Chapter 0-1115.3, and the San Joaquin County Well Standards. 1.0 Site Description The subject Site consists of a rectangular-shaped parcel of land totaling approximately 0.78 acres located at 520 North El Dorado Street in Stockton, California (Figure 1). At the time of Terrax's last site inspection, the subject site was observed to be developed with a vacant office building along the north property boundary and with an asphalt-paved parking lot south of the property building. A pad-mounted transformer was observed near the northeast corner of the property (Figure 2). 1.1 Site Investigation History Terrax prepared a Phase I ESA, dated August 11, 2016 for the Site. Historical records indicated that the subject site was part of a larger parcel that was occupied by a tannery as early as 1895. According to the historic records, the southern part of the site was used to store wood bark used in the tanning process, while the northern part was part of a sole-rolling building. Tanning and leaching vats are shown adjacent east of the subject site. Terrax could not locate information pertaining to any soil or water contamination associated with the tannery and any potential metals and organics contamination from the adjacent vats. 4952 Warner Avenue, Suite 242, Huntington Beach California, 92649 Page 1