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3.1.4 STANDARDS FOR AUGER DRILLING Auger drilling is hole advancement by rotating an auger while pressing it into the soil. Three types of augers are commonly used at hazardous waste sites: a solid stem auger, a hollow stem auger, and a bucket auger. The solid stem auger is a helix flange welded onto a solid pipe. The hollow stem auger is a helix flange welded onto a hollow pipe. The bucket auger is a cylinder with a bottom that has a toothed opening to slice into the soil. Solid stem and bucket augers have a limited use at hazardous waste sites because there is no way to prevent the spread of contamination during augering and no way to collect undisturbed samples. Standard 21.4.1 Solid stem and bucket augers shall not be used to drill through contaminated materials or to drill into saturated materials. 3.2 CORING STANDARDS Cores are time-consuming to drill, sensitive to moisture changes and pressure changes at the surface, and bulky. However, cores are the best tools to determine exactly what the subsurface geology is at the drill hole. Because of the expense of drilling cores and the value of the information derived from the cores, it is important to handle and store the cores in a manner that preserves the cores throughout the duration of the project. Standard 2.2..1.1 All coring bits, core liners, and core catchers shall be decontaminated prior to taking each core. -�' Standard 2212 All cores shall be drilled using clean, shatter-proof liners. Cores shall be kept in their liners until logging. Standard 2.21.3 All cores shall be stored in core boxes by cutting the liners and cores to length, capping with moisture-proof caps, marking the depth at each end of each length of liner, and piacing the cores in tcore boxes in be indicated on a water-proof card order by with each Unrecovered intervals of cores shall core box. on t. Standard 2.21.4 Core boxes with res and shlalblestored be keptfllocked,the uexcleptoashacess s The storage location shall be secure required by authorized personnel. Standard 221.5 A sign-out list shall be maintained at the core storage location. Cores removed for logging or sampling shall be returned to the core boxes. Portions of cores removed for sampling shall be indicated by notation on a water-proof card to be kept with each core box. Core drilling requires fluid circulation to cool the bit and remove cuttings. The standards for circulating fluids listed under Section 6.2 apply to core drilling. -13- These standards are for review and comment onl y>: