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SOIL INVESTIGATION WORK PLAN Grant Line Road , Tracy , California Delta Project No . 4049 - 052 Page 3 water be encountered at depths less than 20 feet the soil boring will be advanced no further and will be sealed to surface with a cement- bentonite slurry . The proposed locations of soil borings to be advanced at the site are illustrated in Figure 2 . All drilling and sampling at the site will be conducted in accordance with methods and protocols outlined in Appendix A , Section 1 . 0 . Section 2 . 0 of Appendix A contains quality assurance procedures to be observed during sample collection and analysis . Section 3 . 0 of Appendix A contains health and safety procedures and site emergency contact information . 3 . 2 Soil Sample Collection , Classification , and Screening Soil samples will be collected above the water table at a minimum vertical spacing of 5 feet using methods and procedures outlined in Appendix A , Section I . I . A soil sample will also be collected at the soil - water table interface . As samples are retrieved from each soil boring , they will be visually and manually examined by a Delta geologist or engineer and classified according to methods outlined in Appendix A , Section 1 . 2 . A portion of each soil sample will be placed in a glass jar and the head space in the jar will be screened with a PID as described in Section 1 . 3 of Appendix A . Soil samples which yield a PID reading of 50 ppm or more will be submitted for laboratory analysis . If samples from all the soil borings yield a PID reading of less than 50 ppm , selected samples may be submitted to the laboratory to confirm PID results . Surface soil samples will also be collected for compositing by the laboratory . The composite samples will be analyzed for pesticides . 3 . 3 Soil Chemical Analysis Soil samples sent to the laboratory on the basis of PID screening will be analyzed by U . S . Environmental Protection Agency (EPA ) method 8260 for BTEX , and total petroleum hydrocarbons (TPH ) . The composite sample will be analyzed for pesticides by EPA method 8270 . 4 . 0 SCHEDULE Delta will proceed with the work outlined in this plan as soon as approval is obtained . A drilling crew will be mobilized to drill the proposed soil borings within 1 week of approval of this plan . Laboratory analysis of soil samples generally requires 3 weeks . A summary report of the results ,