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WORK PLAN FOR PHASE II SOIL INVESTIGATION <br /> FIRE STATION NO. 12 <br /> 4010 EAST MAIN STREET <br /> r STOCKTON, CALIFORNIA <br /> 1.0 INTRODUCTION <br /> This work plan is for the assessment of soils containing petroleum product constituents <br /> (PPCs) at Fire Station No. 12 located at 4010 East Main Street, Stockton, San Joaquin <br /> County, California (site) (Drawing 1). Preparation of this work plan was authorized by the <br /> City of Stockton Department of Public Works. <br /> This work plan was prepared by the Environmental Services Division of The Twining <br /> Laboratories, Inc. (Twining) in Modesto, California. <br /> 2.0 PURPOSE AND SCOPE <br /> The purpose of this project is to characterize soils containing selected PPCs in the vicinity <br /> of two 550-gallon underground storage tanks (USTs) formerly located at the site (Drawing <br /> 2). The following scope of work is proposed to meet the objectives stated above: <br /> s Drill four soil borings in and around the former location of the two 550-gallon USTs <br /> to assess the vertical and lateral extent of soils containing PPCs; <br /> .® • Analyze selected soil samples for total petroleum hydrocarbons as diesel (TPH-D), <br /> total petroleum hydrocarbons as gasoline (TPH-G), benzene, toluene, ethylbenzene, <br /> and total xylenes (BTEX); and <br /> • Prepare a report documenting field activities and presenting findings, evaluations, <br /> r ' and conclusions. A site location map, site plan showing soil boring locations, final <br /> #• boring logs, and stratigraphic cross-sections (if appropriate) will be included. <br /> It is Twining's opinion that the above-referenced scope of work is the minimum required <br /> to meet the stated objective. This scope of work would expand in the event that PPCs are <br /> detected through the field screening process. The approach and rationale for an expanded <br /> scope of work are described in section 4.1. <br />