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All field activities will be conducted in accordance with the site specific Heath and Safety Plan <br />(Attachment 2) and Quality Assurance Quality Control Plan (Attachment 3). The investigation <br />will be conducted under the supervision of a California Registered Engineer. <br />Soil Borings <br />The proposed soil borings will be advanced in the vicinity of the former excavation as shown on <br />Figure 4. Five of the borings will be advanced outside the northern portion of the excavation to a <br />depth of approximately 15 feet below ground surface to determine the lateral extent of <br />contamination in these areas. One soil boring will be advanced in the vicinity of the former <br />underground storage tanks to a depth of approximately 25 feet below ground surface or until <br />residual soil contamination is no longer evident. The deeper boring will be placed near the <br />location where excavation confirmation sample B2 at 15' was collected. <br />Boring advancement and soil sample collection will be conducted by a State -licensed (C57) <br />drilling company using direct push methodology. Samples will be collected using the Geoprobe <br />5400 Soil Probe Unit, a dual -rod sampling technique which will enable collection of undisturbed <br />soil samples at the desired depths. Soil samples will be screened every five feet with a PID and <br />two samples per boring will be submitted to a State -certified laboratory for analysis of BTEX, and <br />TPHg utilizing EPA methodologies 8020 and modified 8015, respectively. Soil samples selected <br />for laboratory analysis will be determined in the field and based upon PID readings and field <br />observations. Subsequent to sample collection, voids created by the Soil Probe Unit will be <br />grouted to the surface with a neat cement grout. Any soil cuttings generated during sampling <br />activities will be contained on site in Department of Transportation (DOT) approved drums <br />pending analytical results of soil samples. <br />Report Preparation <br />Subsequent to receiving analytical results from collected soil samples, Smith Environmental will <br />prepare a report summarizing the findings of the investigation, and if appropriate will recommend <br />remedial alternatives for residual soil contamination. <br />Remediation of Excavated Soil <br />Smith Environmental has submitted a completed Application for Authorization of Uncontrolled <br />Soil Aeration to the San Joaquin Valley Air Pollution Control District (APCD) for on-site <br />remediation of the excavated soil stockpiled which remains on-site. Pending APCD approval, the <br />soil will be aerated on-site. <br />150081\sxR-0995.uoc 5 <br />• <br />SNITN <br />