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■ 2.0 Plan of Action <br /> IT plans to perform the soils investigation at the Pacific Bell facility located at 345 North <br /> San Joaquin�oad)n Stockton, California, in order to further characterize soil quality beneath <br /> the Lindsay Street side walk near the west end of the former middle underground storage tank <br /> location. The investigation has the following goals: <br /> 1. Further examine the vertical distribution of petroleum hydrocarbons in loll near <br />' the west end of the former middle tank location (east end of new tank). <br /> 2. Further identify the subsurface geology at the site. <br />' 3. Provide for future observation of vadose zone soil conditions as necessary. <br /> 4. Evaluate all results and recommend any further action at the site that may be <br /> warranted. <br /> 5. Coordinate all field work with Pacific Bell as well as local and regional <br /> regulatory agencies. <br /> To accomplish these goals, rr plans to drill two soil borings (Figure 3). The soil boring <br /> locations were identified to examine the distribution of petroleum hydrocarbons near the west <br /> end of the former middle diesel tank location. To facilitate future observation of vadose zone <br /> soil conditions, observation wells will be installed in each open borehole. <br />' Where applicable, field investigation methods will follow the Tri-Regional Board Staff <br /> Recommendations for Preliminary Evaluation and Investigations of Underground Storage <br /> Tank Sites, 10 August 1990. The following section describes the procedures that will be <br /> used in completing the investigation. <br /> 2.1 Drilling Methodology <br />' IT will notify Underground Services Alert (USA) at least two working days before starting <br /> any drilling activities. This, in addition to studying utility maps and the contracting of an <br />' independent line locating service, will help insure that drilling activities will not encounter <br /> any underground utilities. <br /> MZ/05-10-94/UST/94-0062.nbr 2-1 <br />