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• r • 16 April I997 AGE -NC Project No 95-0121 Page 8 of 9 42 INSTALLATION OF IN-SITU AIR SPARGING POINTS The following procedures will be performed for the installation of air sparging points I Prepare a Site Health and Safety Plan in accordance with the Occupational Safety and Health Guidance Manual for Hazardous Waste Site Activities - Prepared by National Institute for Occupational Safety and Health, Occupational Safety and Health Administration, U S Coast Guard and U S Environmental Protection Agency, October 1985 2 Notify the San Joaquin County Environmental Public Health Services - Environmental Health Division (PHS-EHD) 48 hours prior to commencement of any work, while securing proper city/county soil boring or well permits 3 Air sparging locations will be marked at least 48 hours in advance for an Underground Service Alert (USA) check of underground utilities or pipes 4 Advance seven soil probe borings to a total depth of approximately 30 feet bsg using a Geoprobe 5400 probing unit equipped with 1 125 -inch diameter probe rods Soil boring/probing locations are depicted on Figure 7 . 5 All probing rods will be cleaned prior to boring advancement 6 Complete each soil probe boring as an an-sdu air sparging point Each soil probe boring will be completed using 31/2 -feet of 3/8 -inch diameter stainless steel screen from an approximate depth of 26 5 to 30 feet bsg Polyethylene tubing (3/8 -inch diameter) will be used to provide infected air from surface grade to the sparge point A filter pack will be installed utilizing glass beads (50-100 mesh) from depths of 25 to 30 feet bsg, while a bentonite plug will be placed from depths of 20 to 25 feet bsg Each point will then be backfilled to surface grade utilizing Portland Type II cement IAS infection point construction diagrams are depicted in Figure 8 4 3 CONFIRMATION SOIL SAMPLING The following procedures will be performed for the advancement of confirmation soil borings I Prepare a Site Health and Safety Plan in accordance with the Occupational Safety and Health Guidance Manual for Hazardous Waste Site Activities - Prepared by National Institute for Occupational Safety and Health, Occupational Safety and Health Administration, U S Coast Guard and U S Environmental Protection Agency, October 1985 2 Notify the San Joaquin County Environmental Public Health Services - Environmental Health Division (PHS-EHD) 48 hours prior to commencement of any work, while securing proper city/county boring permits