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All field activities will be conducted in accordance with the site specific Health and Safety Plan <br /> (Appendix II) and RESNA's Quality Assurance/Quality Control Plan (Appendix M). The field <br /> investigation will be conducted under the supervision of a California Registered Geologist. <br /> �r� <br /> A problem assessment report will be prepared according to Tri-Regional guidelines summarizing <br /> the findings of the investigation. The Registered Geologist will review and sign the problem <br /> assessment report. <br /> 4.1.1 Drilling <br /> `- Proposed soil borings will be advanced to the depth of saturation, approximately 15 feet <br /> below grade. Two borings will be converted to monitoring wells (Figure 4) by further <br /> advancing the boring to a total depth of approximately 30 feet below grade, or 15 feet <br /> -: below the depth where groundwater is first encountered. <br /> Drilling will be conducted by a State-licensed C57 drilling company using a hollow stem <br /> auger drill rig. A field geologist will be present to continuously log all drill cuttings and <br /> 1 ? soil samples utilizing the Unified Soil Classification System. Descriptions of soil types <br /> encountered, sample collection intervals, boring abandonment, and well construction <br /> {{ details will be recorded on we11/boring logs to be submitted to PHS/EHD. Cored soil <br /> :rel <br /> samples will be collected at five foot intervals in accordance with RESNA's Quality <br /> =� Assurance/Quality Control (QA/QC) Soil Sampling Protocol (Appendix III). <br /> Soil samples collected at 5 and 10 foot depths from each borehole will be submitted for <br /> laboratory analysis. Samples collected below the water table will not be submitted for <br /> Er analysis. Analysis will be conducted for BTEX and TPHD by RESNA Environmental <br /> Laboratories (FLAP No. 1211). Soil samples will be analyzed for BTEX and TPHD <br /> by EPA methods 8020 and modified 8015, respectively. The method detection limits <br /> at RESNA Environmental Laboratories for BTEX and TPHD in soil is 0.005 and 10 <br /> VX"RTS/WP-1292.FNL 4 <br />