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540 West Scotts Avelke • August 4, 1997 <br /> Project 9644 Page 4 <br /> 3.3 Soil Boring and Soil Sampling <br /> One soil boring will be advanced through the asphalt cap using a mobile drilling <br /> rig equipped with hollow stem flight augers. A sample of the treated soil will be <br /> collected approximately 5 to 6 feet below the asphalt cap in the stabilized <br /> material. A sample representing the stabilized material will be collected from the <br /> hollow stem flight augers and placed into glass jars. Approximately 300 grams <br /> (0.56 pound) will be collected for analyses. <br /> Drilling will continue until native soil is encountered below the stabilized soil. <br /> ' Groundwater is not expected to be encountered during soil boring activities. A <br /> soil sample will be collected from the undisturbed native soil beneath the <br /> stabilized material with a split spoon sampler equipped with three 6-inch long by <br /> ' 2-inch diameter stainless steel tubes driven with a 140 pound hammer. One <br /> sample tube chosen for analyses will be fitted on each end with a teflon patch <br /> and covered with plastic end caps. <br /> The soil and stabilized material samples will be properly labeled with sample <br /> number, date and time of collection, and samplers initials. The samples will be <br /> sealed into plastic zip-lock bags and placed on frozen water in an insulated <br /> cooler. A chain-of-custody form will be filled out to document the soil sample <br /> collection and will be kept with the soil samples until relinquished to a California <br /> certified laboratory for analyses. <br /> Soil and stabilized material samples will be analyzed for: <br /> Lead by California Waste Extraction Test and EPA Toxicity Characteristic <br /> ILeaching Procedure <br /> Zinc by California Waste Extraction Test and EPA Toxicity Characteristic <br /> Leaching Procedure <br /> pH by California Waste Extraction Test and EPA Toxicity Characteristic <br /> ' Leaching Procedure <br /> Lead and Zinc by Soluble Threshold Limit Extraction (STLC) using de- <br /> ionized extraction method (stabilized material only) <br /> The soil and stabilized material samples will be placed on normal (two week) <br /> turn around time with the laboratory. <br /> The boring with be backfilled with a cement bentonite slurry with an asphalt <br /> surface plug to ensure the integrity of the asphalt cap and the stabilized soil. Soil <br /> and stabilized material generated during soil boring activities will be placed into <br /> a Department of Transportation 17H rated drum and properly labeled. The soil <br /> ' WILLIAM DUBOVSKY ENVIRONMENTAL <br /> Environmental Consulting ♦ Project Management <br />