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Kennedy,-Jenks Consultants <br /> 2 FIELD INVESTIGATION <br /> The field investigation will include the following activities: <br /> 2.1 Prefield Activities <br /> Kennedy/Jenks has prepared a site-specific Health and Safety Plan for the activities <br /> proposed in this Work Plan. Underground Services Alert (USA) will be contacted prior to <br /> the start of work to mark the locations of subsurface utilities adjacent to the property, <br /> however USA does not typically locate onsite utilities or privately owned utilities. <br /> Therefore, a utility locating firm will also be contracted by Kennedy/Jenks to search for <br /> buried utilities or obstacles at the proposed sampling locations. <br /> Kennedy/Jenks will retain a licensed driller who is authorized to drill soil borings and obtain <br /> soil samples within San Joaquin County. If necessary, a concrete cutting contractor will be <br /> retained by Kennedy/Jenks prior to the start of drilling activities to allow drilling access to <br /> the subsurface. <br /> 2.2 Field Investigation <br /> 2.2.1 Geophysical Survey <br /> A geophysical exploration subcontractor will attempt to identify the location of the <br /> subsurface piping and the UST. The geophysical survey will use magnetics, and induced <br /> electromagnetics, as appropriate, to attempt to locate the UST and piping. Survey grid <br /> patterns appropriate to the size and shape of the objects will be used in the locating <br /> attempts. Because of the uncertain subsurface conditions, and the likely presence of <br /> interfering metallic objects, it is possible that the results of the survey may be inconclusive. <br /> 2.2.2 Subsurface Soil Sampling <br /> Kennedy/Jenks proposes to advance two borings to an approximate depth of 20 feet below <br /> ground surface (bgs) at the locations shown on Figure 1. A combination direct push <br /> sampling/drilling rig will be used to place the borings and collect soil samples for laboratory <br /> analysis. The rig will be converted to auger drilling if the soils cannot be penetrated or a <br /> target depth cannot be achieved using the direct push method. The direct push sampling <br /> techniques are presented in Appendix A. The hollow-stem auger drilling and sampling <br /> techniques are presented in Appendix B. <br /> Soil samples will be collected approximately every 5 feet using a split-spoon sampler lined <br /> with acetate tubes. Sample collection and preservation procedures are contained in <br /> Appendices A and B. Subsurface soils will be continuously logged in accordance with the <br /> USCS Visual-Manual Procedure (ASTM D2488-93). Soil conditions in each borehole will <br /> be recorded on a boring log. Soil samples will be selected from each boring for analysis <br /> based on field observations including odor and color. Samples will also be screened in the <br /> field for headspace gasses using a portable organic vapor analyzer. <br /> Kennedy/Jenks has assumed that the soil borings will be terminated at 20 feet bgs. <br /> However, if field observations indicate that soils are potentially impacted by PHCs below <br /> 20 feet bgs at either location, that boring may be advanced deeper to collect additional soil <br /> 0job\96\966070.01\workplaMtext.doc 2 <br />