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2.2.4 Soil Boring and Sampling Procedures <br /> a licensed water well driller (C-57 <br /> The soil boring will be drilled by a State of Californi' <br /> Water Well Driller contractor's license) using 8-inch diameter, hollow-stem, auger <br /> drilling equipment to a depth of 50 feet or the depth of groundwater, wh:chever occurs <br /> first. The augers will be steam-cleaned before drilling to prevent introduction of off- <br /> site contamination. Representative soil Samples will be collected for chemical analyses <br /> in the vadose zone at approximately 5-foot depth intervals, or at changes in litholrigY, <br /> belou the ground surface by advancing a California split-spoon sampler, equipped with <br /> -s into the undisturbed soil beyond the tip <br /> 2-inch diameter by 6-inch long brass tube , <br /> of the augers. The sampling equipment will be cleaned before each sampling event <br /> by washing with a trisodium phosphate solution and rinsing in distilled water, Samples <br /> collected for chemical analysis will be preserved in the tubes by quickly covering the <br /> open ends with aluminum foil capped with plastic end caps taped to the tubes with <br /> duct tape. The tubes will be labeled and stored on ice for transport to a State- <br /> certified laboratory accompanied by chai n-o f-custody documentation. <br /> A detailed boring loa will be prepared from auger return material and split-SPOOn <br /> 0 g to the Unified Soil Classification System <br /> Samples. The soil will be logged accordin <br /> under the super-vision of a California Registered Geolocolist. <br /> Drill cuttings will be stored on site, contained in plastic 01 55-gallon stec' drums. The <br /> stored cuttings will be labeled to show contents, date stored, suspected contamMation, <br /> expected date of removal, company name, contact, and telephone number. Disposal <br /> client, After the cuttings are characterized <br /> of the cuttings is the responsibility the <br /> by chemical analysis, TPE will provide recorOmendations to the client and, upon their <br /> request, assist them in remediation, or disposal of the cuttings, or both in an <br /> appropriate manner as an additional work item. <br /> The boring will be scaled to ground surface with neat cernent or a cement-sand slurry. <br /> See Appendices C and D for TPE's protocols relative to hollow-stem auger drilling and <br /> soil sampling procedures and waste handling and decontamination procedures. <br /> W, <br />