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' 0 FIELD PROCEDURES ' I. HOLLOW STEM AUGER DRILLING OF SOIL BORINGS AND COLLECTION OF SOIL SAMPLES ' 1. Drilling was conducted by a licensed State of California driller under the supervision of PSI. Drilling equipment was pressure washed at the beginning of the day and between soil borings. 2. Prior to the commencement of drilling activities at the site, Underground Service Alert (USA) was contacted to identify underground utilities in the areas that the borings will be located. 3. Boring logs for the soil borings drilled at the site was prepared under the supervision of ' a State of California Registered Geologist. The soil cuttings observed during drilling were described in accordance with the Unified Soil Classification System. ' 4. Soil samples were collected using a 2.5-inch diameter stainless steel sampler. When the boring was advanced to the appropriate sampling depth, the sampler was lined with 2.0-inch diameter, 6-inch long stainless steel tubes and placed in the open boring. ' An undisturbed soil sample was collected by driving the sampler into the subsurface using a percussion hammer. ' 5. Once the sampler had been retrieved, the ends of the sample tube were covered with Teflon sheets and capped with polyethylene end caps. The samples were labeled and placed in a chilled cooler pending delivery to the laboratory for analysis. 6. Soil samplers were washed between sampling intervals with Alconox soap followed by a deionized-water rinse. ' 7. Chain-of-custody procedures using chain-of-custody forms were used to document sample handling and transportation. 8. Soil cuttings and pressure wash water generated during drilling activities at the site were contained in Department of Transportation (DOT) approved 55-gallon drums. The drums were labeled with the contents, date, well or boring number, client name, ' contact information, and project number. F MansfeffemplateTield Procedures\Hollowstem workplan