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' A.1 DRILLING PROCEDURES AND SOIL SAMPLE COLLECTION ' 1. Borings B1 through B4 were drilled with a limited access, truck-mounted drilling rig using nominal 8-inch outside diameter hollow stem augers. ' 2. The augers were steam cleaned prior to use at the Site, and cleaned between each boring. 3. Soil descriptions, sample type and depth, and related drilling information were recorded on ' boring logs. 4. Soil samples were collected using a split barrel modified California.sampler. ' S. The sampler was cleaned between sample intervals using a brush and tap water followed by a brush and TSP solution, a tap water rinse, and a deionized water rinse. The sampler was ' dried by air or a towel prior to sampling. 6. Soil samples were collected in 2-inch inside diameter and 6-inch long stainless steel or brass ' tubes. Three six inch tubes are generally enclosed in the sampler. Prior to initial use,the sample tubes were cleaned, rinsed, and dried using the procedures described above ' 7. The sampler was driven into soil using a 140-pound hammer dropped approximately 30 inches. The number of blows (blow count) required to advance the sampler 18 inches was recorded on the boring log for each 6-inch increment. 8. Following retrieval of the sampler, one of the two lower 6-inch tubes within the sampler was ' removed from the sampler, and given sample recovery, the ends covered with aluminum foil and capped with PVC end caps. Each sample was labeled with the sample number, sample depth, date, and project number. ' 9. The soil in the remaining sample tubes was used to describe the soil and for field head space analysis. 10. The samples were placed in bags, and chilled in an ice chest with ice. ' 11. The samples were delivered to the laboratory following collection. Sample handling, transport, and delivery to the laboratory was documented using Chain-of-Custody procedures, including the use of Chain-of-Custody forms. r