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SP86-009 Printing Enterprises, Inc. - 2 - March 24, 1986 A.4. Field Testing and Sampling: The borings were performed between March 12 and 14, 1986, with a core and auger drill mounted on a flotation-tired carrier. This machine was equipped wi th hollow-stem augers. The borings were performed in accor- dance with ASTM D1586 "Penetration Test and Split Barrel Sampling of Soils". Using this method, a bore hole is advanced with the hollow-stem auger to the desired test depth. Then, a 140-pound hammer falling 30 inches drives a standard, 2-inch OD, split barrel sampler a total penetration of 1-1/2 feet below the bottom of the bore hole. The blows for the last foot of penetration (BPF), which are an index of soil strength characteristics, were recorded and are shown on the respective logs. Soil samples were, generally, taken at 2-1/2-foot intervals to the 15-foot depth and at 5-foot intervals to the termination depth of the borings. -The use of hollow-stem auger eliminated the driving of casing. In a few instances, jetting water was used to clear the auger prior to sampling. The penetration test borings have been designated with an "ST" prefix. Soils encountered in the power auger borings were visually classified by the cuttings brought to the surface by rotation of the auger. Stratum changes were inferred from the disturbed samples, and thus, should be considered approximate. Power auger borings do not provide a measure of soil strength characteristics do penetration test borings. The power auger bor ings have been designated with a "B" prefix. A.5. Soil Classification: Soils encountered in the borings were visually and manually classified in the field by the crew chief in accordance with ASTM D2487 "Unified Soils Classification System" and ASTM D2488 "Recommended Practice for Visual and lORIIUD'l