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Work Plan to Delineate Soil Contamination in the Ag Chem Area ARCADIS Former Occidental Chemical Corporation Lathrop, California at the water table zone(approximately 15 ft bgs) in the vicinity of the original sample. Proposed sample locations are illustrated in Figures 4 through 6. 3.2.3 Quality Assurance/Quality Control (QA/QC) QA/QC procedures will be employed in both the field and the laboratory. Field duplicates will be collected at a rate of 1 per 10 field samples of similar matrix. The locations and depths of the QA/QC samples will be determined in the field. One equipment rinsate blank will be collected each day that field samples are collected using non-disposable(reusable)sampling equipment. Matrix spike/matrix spike duplicate analyses will be completed by APPL using primary samples collected in the field. Analytical data will be validated by Conestoga Rovers&Associates(CRA)prior to review by ARCADIS.All field procedures will be documented in accordance with the ARCADIS SOPS provided in Appendix B. 3.2.4 Boring Completion Following completion of the drilling activities, boreholes will be abandoned by grouting the hole from the bottom up. Boring completion procedures will be completed in accordance with Section 4.7 of the SJCEHD well standards, included in Appendix C. 3.3 Investigation-Derived Waste Management Waste materials generated from the installation of borings will be placed in Department of Transportation (DOT)-approved containers suitable for subsequent transportation for off-site disposal at a permitted waste management facility.Waste profiles for any waste stream will be prepared, as required by the waste disposition facilities. 3.4 Health and Safety The general health and safety procedures to be followed at the Site are outlined in the Site Specific Health & Safety Plan, Former Occidental Chemical Corporation Facility (ARCADIS, 2011 b). Potential health and safety concerns specific to the proposed investigation activities are addressed in the SOPs provided in the Site Health and Safety Plan,Appendix D. 3.5 Field Work Schedule Upon receiving approval from DTSC for this Work Plan, ARCADIS will initiate proposed pre-field and field activities. Following the completion of the proposed soil investigation, ARCADIS will prepare a summary report of the results. The report will summarize site background,field procedures,field observations, and analytical results including lathropwom,plan supplemental invest ag chem 05012012 Eocx 7