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3 <br /> A0I-5 <br /> • Three soil borings (AOI5-1 through A0I5-3) will be hand angered to a depth of <br /> approximately 3 feet bgs near the southern end of the Site to further delineate <br /> impacts identified in Preliminary Assessment Sample 1; and <br /> • Samples will be collected at 1 and 3 feet in each boring (depth of impact observed <br /> in on-site boring E2-2) and will be analyzed for PAHs using EPA Method 8270C <br /> Selective Ion Monitoring and Title 22 Metals using EPA Method 6010/7000. <br /> AOI-6 <br /> • Two soil borings (AOI6-1 through A0I6-2) will be hand angered to a depth of <br /> approximately 3 feet below ground surface(bgs) inside the warehouse to the east of <br /> Boring A3-SG3; and <br /> • Samples will be collected at 1 and 3 feet in this boring (depth of impact observed in <br /> on-site boring A3-SG3) and will be analyzed for PAHs using EPA Method 8270C <br /> Selective Ion Monitoring. <br /> All environmental borings will be screened for impact via visual, olfactory and/or PID <br /> readings; will be backfilled with Portland cement with 5% bentonite; and the surface will <br /> be returned to conditions existing prior to soil boring operations. A total of 58 samples will <br /> be collected for analysis. If impacts are visually observed, additional soil samples will be <br /> collected and submitted for analysis. This would be considered a change condition and <br /> would be addressed under New Task 7 (As Needed Services). <br /> Geotechnical Borings <br /> A total of two geotechnical borings will be drilled at the Site as shown in the attached <br /> figure. Boring GEO-1 will be used to assess geotechnical consideration associated with <br /> the on-site warehouse. Boring GEO-2 will be used to assess conditions adjacent to the gas <br /> meter and regulator area. <br /> The two borings will be drilled to a maximum depth of 25 feet bgs using a hollow stem <br /> auger drill rig. Samples will be collected from each soil category (i.e., sand, gravel, silt <br /> and/or clay)and submitted for geotechnical analyses including the following: <br /> • ASTM D3080 direct shear—sand and gravel; <br /> • ASTM D2850 direct shear—clay; <br /> • ASTM D2435 consolidation test; <br /> • ASTM D2937 moisture/dry density; <br /> • ASTM D4318 Atterberg limits; <br /> • ASTM D422 gradation; and <br /> • ASTM D1557 compaction. <br /> Geotechnical borings will be backfilled using bentonite grout as outlined in the San <br /> Joaquin County Environmental Health Division guidance for installation of soil borings. <br />