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Phase 1I Site Assessment Workplan/Health and Safety Plan October 1999 <br /> for the Hammer Lane/Highway 99 Interchange Improvement Project Project No. H2O2 <br /> classification and any anomalous features will be noted. Driven soil samples will be obtained <br /> at approximate intervals of 5 feet unless observations (such as contamination) suggest different <br /> intervals. Cuttings and samples will be screened with a PID. Borings will be backfilled with <br /> a cement-bentonite grout. <br /> Drilling is expected to take 2 days. Drilling spoils will be placed in steel 55-gallon drums, <br /> labeled, capped, and stored on a remote portion of the site until further characterization of soil <br /> cutting contamination, if present, is completed. Following laboratory analyses of soil samples, <br /> cuttings from borings showing no contamination will be spread in soil areas on-site. Cuttings <br /> from borings showing contamination will be characterized and disposed of appropriately. <br /> The augers will be rinsed with a steam cleaner and/or TSP solution after completion of each <br /> boring. Rinse water will be contained and transferred to a plastic 55-gallon drum for further <br /> characterization and disposal if necessary. Rinse water drums will be stored at a remote <br /> portion of the site. <br /> Sampling <br /> Soil samples will be obtained using a driven California split-spoon sampler lined with 2-inch <br /> diameter by 6-inch long steel or brass tubes. Soil samples for laboratory analysis will be <br /> collected by advancing the boring to the desired sampling depth, removing the auger plug, and <br /> lowering the sampler through the auger. The sampler will then be driven below the auger tip <br /> (a total of 12 inches minimum) using a hydraulic driven 140-pound hammer. The lowermost <br /> (lead)tube will be immediately removed from the sampling device, capped with teflon tape and <br /> plastic end caps, then taped and sealed. The sample will be labeled, logged on a chain-of- <br /> custody/sample management form, and placed in a iced cooler kept at a temperature of <br /> approximately 4°C until delivered or picked-up by the laboratory for analyses. <br /> Sampling devices will be washed with a TSP or AIconox solution and rinsed in deionized water <br /> following each sampling event. Rinse water will be contained and transferred to a plastic 55- <br /> gallon drum for further characterization and disposal if necessary. Rinse water drums will be <br /> stored at a remote portion of the site. <br /> 3 <br /> V ESPANA GEOTECHNICAL CONSULTING <br />