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' Section 1: Introduction <br /> ' Kennedy/Jenks Consultants (Kennedy/Jenks) has prepared this Soil Investigation Work Plan, Stn <br /> Street Storage Area (Work Plan) on behalf of the Union Pacific Railroad Company (Union Pacific) <br /> for the Stockton Railyard (Site) in Stockton, California (Figure 1). The Work Plan has been <br /> ' produced to assist Union Pacific with the delineation of the subsurface stormwater system and the <br /> assessment of soil conditions in the storage area immediately south of the 8th Street entrance <br /> (Figure 2). The 8th Street Storage Area is identified on Figure 3, and is bounded by an unnamed <br /> ditch to the east, the 8th Street entrance to the north, the main track area to the west, and the <br /> Repair-in-Progress (RIP) area to the south. The Work Plan addresses specific tasks being <br /> conducted on a voluntary basis by Union Pacific. The tasks include: <br /> • Conduct a geophysical survey to map the metal culverts and buried drop inlets of the <br /> stormwater system in the 8th Street Storage Area. <br /> • Advance up to 15 soil borings in the 8th Street Storage Area and collect soil samples for <br /> laboratory analysis to assess potential fuel impacts in soil. <br /> 1 • Prepare a 8th Street Storage Area Soil Investigation Report (Report) summarizing <br /> findings of the investigation. <br /> 1.1 Site Description <br /> The Site is located southeast of downtown Stockton, California, and extends in the north-south <br /> ' direction for approximately 2.5 miles (Figure 1), and includes the railyard area between Charter <br /> Way on the north, and Industrial Drive at the south. Figure 2 presents an overview of the Site. <br /> ' An unnamed ditch drains the eastern boundary of the Site, and extends from the northern <br /> entrance to the central portion of the Site, where the ditch joins with Duck Creek. Duck Creek <br /> runs parallel to the railyard for approximately 2,000 feet, at which point it turns west and enters <br /> a set of four culverts that route the creek under the tracks. Approximately one-third of a mile <br /> west of the Site, Duck Creek enters Walker Slough. <br /> ' 1.2 Background Information <br /> Stormwater samples collected from outfalls draining the 8th Street Storage Area were collected <br /> in February 2005, and analyzed for total petroleum hydrocarbons as diesel (TPHd) and as <br /> motor oil (TPHmo). The 8th Street Storage Area outfalls are identified as SW-15, SW-16, SW- <br /> 17, SW-18, and SW-19 on Figure 3. Results indicated TPHd at concentrations up to 11,000 <br /> micrograms per liter (Ng/1), and TPHmo at concentrations up to 3,400 pg/I. Results were <br /> reported in the Stormwater Monitoring Report(Kennedy/Jenks 2005a). The layout of the <br /> culverts which connect to the 8th Street Storage Area outfalls is uncertain. The geophysical <br /> survey has been proposed in order to map the system of culverts that discharge at the outfalls. <br /> ' The soil sampling program has been proposed in order to test for the potential presence of TPH <br /> in soil which may influence water quality in the water draining from the culvert system. <br /> Soil Investigation Work Plan Page 1 <br /> Union Pacific Railroad Company, Stockton Railyard, Stockton, California <br /> j:\2003\032777.16_union pacific-stockton yard\09-reports\wplan_soilboring\text\wp_soil_1003.doc <br />