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Ramcon Standard Procedures Standard Procedure 2 Re,i 2/95 Drilling and Sampling Soil Borings with Hollow-Stem Auger Drilling Equipment See Also Procedure: Typical Monitoring Well Detail, Sample Handling, Sample Equipment Decontamination Limitations: These procedures have been developed and adopted for utilization primarily for the assessment of fuel and motor oil constituents at underground storage tank or fuel spill sites. Conditions: The drilling location must be cleared of underground utilities by the property owners,representatives or USA alert. The location of overhead power lines may preclude all work. The first five feet of all borings will be hand augered to clear obstructions unless site utilities are well documented. Equipment: Iced Insulated Cooler Brass Sample Sleeves Plastic End Caps Teflon Sheeting Indelible Ink Marker Plastic Packing Tape Weighted Measuring Tape Logs and Field Note Book Electronic Water-Level Meter OVA Soil Borings Soil borings are advanced and sampled by truck-mounted drill rigs. The drill string will consist of pre- cleaned steel continuous flight hollow stem augers,drill rod and lead auger bit. The augers are rotated and advanced to the desired depth and lifted approximately 2-3 inches off bottom. A split-barrel,or California- modified sampler containing three,six-inch long,2%2 inch diameter brass sample sleeves is attached to one of two types of sampling mechanisms. With Central Mine Equipment Company (CME)-type equipment, the drill rod is withdrawn from the borehole and the sampler is attached to the end. The rod and sampler are re-inserted into the boring through the augers and run into the hole until bottom is tagged. The depth of the sampler is checked against the depth of the lead auger; they should be the same. When utilizing Mobile Drill-type equipment,the lead auger plug is withdrawn by wire line from the borehole bottom and retrieved to the surface. A sampler and down-hole hammer are attached and the apparatus is re-inserted into the borehole through the augers. The apparatus is run into the hole as described above. The sampler,once on bottom of the boring,is advanced with a cable or rope-cathead activated sampler with a 140-1b hammer and a 30-inch drop. The drops of the hammer,or blows are recorded. The first six inches to set sampler, second and third six-inch intervals are recorded, as blows per 6-inch. Typically 18-inch samplers with a 2.5 inch core bullet are utilized. Larger, longer split-barrel samplers up to 48 inches are utilized for continuous coring. Samples from the bottom(nose)and middle of the sampler are considered the most representative and undisturbed. The bottom,or deepest sample is used for laboratory analysis. The