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Revised Work Plan,Additional Excavation and Confirmation Soil Sampling Bulk Transportation Facility,Stockton, California Hygienetics Environmental Services,Inc. collected either directly from the excavation or from soil brought to the surface by the backhoe bucket,depending on the depth of excavation. One soil sample will be collected from a point within each 10-foot4ength of sidewall exposed during excavation and from a point within each 10-foot length of the floor of the excavation. A maximum four sidewall soil samples and two floor soil samples would be collected from the maximum-size excavation. Plate 3 shows the approximate locations at which samples would be collected. Any slough material in the excavation and approximately 3 inches of exposed native soil in the backhoe bucket will be removed before sampling. Soil samples will be collected using a slide-hammer sampling tool containing a clean, 2-inch-diameter by 6-inch-long brass sleeve. The sampling tool will be driven into the native soil to collect each sample. Bulk Transportation anticipates excavated soil will be removed from the site and disposed at an appropriate landfill facility. For purposes of characterizing the soil for disposal, samples will be collected from the stockpile in accordance with the requirements of the anticipated disposal facility. For smaller volumes of soil, landfill facilities typically require a four-point composite sample be collected for each 100 cubic yards of soil. On withdrawal, the brass sleeves containing the soil samples will be capped with Teflon sheets and plastic end caps and each end of the sleeves will be wrapped with duct tape. The brass sleeves will be labeled with a unique identifying number, date, and project number and will be placed on ice in a cooler. Hygienetics personnel will prepare a Chain-of-Custody form for the samples and this form will accompany the samples to the laboratory. 2.4 Laboratory Analysis Soil samples will be analyzed for TPHd using Environmental Protection Agency (EPA)modified Method 8015 and for BTEX using EPA Method 8020. The laboratory method detection limit for analysis for TPHd will be 1.0 ppm and for BTEX will be 0.005 ppm. for undiluted samples. In addition, samples from the soil stockpile will be tested for other analytes (e.g., total lead)to fulfill the acceptance criteria of the landfill facility. McCampbell Analytical, Inc. of Pacheco, California,a state of California certified testing laboratory will analyze the samples. 3.0 REPORT AND SCHEDULE OF WORK 3.1 Technical Report Hygienetics will prepare a letter report for the project. The report will present the results of field and laboratory work. A site map showing the locations of confirmation soil samples and copies of the laboratory report will be included in the report. A geologist registered in the state of California will sign the report. 3.2 Schedule of Work Work will begin work as soon as notification of the approved revised work plan is received and when work is authorized by Bulk Transportation. Fieldwork, Iaboratory analysis, and reporting should be completed approximately 1 month after authorization to proceed. 4