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AET #94-1805 - Page 7 <br /> consider methane detectors and basement ventilation which will function if methane reaches <br /> concentrations where potential explosive conditions are incurred. <br /> SUBSURFACE EXPLORATION <br /> General <br /> The subsurface exploration program consisted of one (1) standard penetration test boring. The <br /> field work was performed on September 2, 1994. <br /> The approximate soil boring location is shown on the attached sketch. The boring location was <br /> located in the field by AET personnel by taping from nearby site features. Surface elevations <br /> were measured in the field by AET personnel using an engineer's level. Benchmark reference <br /> was the street elevation at the entrance of the driveway and Wildhurst Trail. This elevation was <br /> taken as 100.0', an assumed elevation. <br /> Drilling Methods <br /> The standard penetration test borings were drilled using hollow-stem augers. Where required <br /> by Minnesota Department of Health rules, the boreholes were grouted upon completion. <br /> Sampling Methods <br /> Split-Spoon Samples (SS) <br /> Standard penetration (split-spoon) samples were collected in accordance with ASTM:D1586. <br /> This method consists of driving a 2" O.D. split-barrel sampler into the in situ soil with a 140- <br /> pound hammer dropped from a height of 30". The sampler is driven a total of 18" into the soil. <br /> After an initial set of 6", the number of hammer blows to drive the sampler the final 12" is <br /> known as the standard penetration resistance or N value. <br />