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s Ramcon Standard Procedures Standard Procedure 2 Drilling and Sampling Soil Borings second sample may be used for headspace analysis and lithologic description, and may be retained for later office evaluation or sieve-size analysis. Sieve-size analysis will consist of composite samples representative of the screened interval where appropriate. Samples are removed from split-barrel sampler and immediately sealed with Teflon sheeting, then capped with plastic caps. Where fuel hydrocarbons are of interest, plastic strapping/packing tape is utilized to secure the cap on the sample. The sample is immediately placed in an iced cooler. Where appropriate, a plastic bottle of deionized water is used to verify cooler temperature upon receipt at the analytical laboratory. Soil or Sample Description Soil samples are described in the field in accordance with ASTM D 2488 - 90. This procedure incorporates a practical procedure to essentially implement the Unified Soil Classification (USCS) system with hand samples. Where required, samples may be relinquished to a testing laboratory for sieve size, hydrometer, or additional testing to establish liquid limit values, etc. Pertinent structures and features including moisture content, bedding, rootlets, or other indications of secondary porosity are included in the description. Regolith or bedrock is described in accordance with American Association of Petroleum Geologists (AAPG) criteria. In either case, depth to first groundwater, odors or staining are included in the sample descriptions. Confining Layers, Drilling and Sampling below the Water Table Samples are typically collected at five-foot intervals. Drill cuttings are evaluated in the intervals between samples, and samples may be collected at zones of interest between sample intervals. These zones may include changes in lithology, discernable odor or staining, or moisture content changes. Unless the site lithology and hydrogeology is well documented and understood with respect to contamination, borings will not be drilled through contaminated zones, and through subsequent confining layers beneath the water table. In instances where the borings are the first historical data source on site, borings may terminate upon encountering more than three feet of clay or aquiclude beneath the water table. Heaving or Flowing Sands Where liquefaction of formation occurs below the water table impairing sample collection, potable water may be added to the augers to equalize the hydrostatic pressure and allow sample collection for litholoQ'ic description. If site hydrogeology is well understood and documented, the bit may be capped to allow drilling and subsequent monitoring well construction. The quantity of water added will be documented for removal during development or purging. Field Sample Headspace Organic Vapor Analysis: Soil samples collected from zones of interest are evaluated after sample description by field screening with an OVM. The samples are obtained from the sampler as described above. The organic vapor analyzer H:\WPDATA\MIKE\PR0CEED\2B0RE Page 2 of 3