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' <br /> ' . . - . <br /> AET #20-01080 -Page 15 <br /> ' <br /> ' SUBSURFACE EXPLORATION <br /> ' goring Location/Elevation Data <br /> Our recent geotechnical subsurface exploration program included drilling six standard penetration <br /> ' test borin s at the site on March 19 and 20, 2001. The approximate locations of the borings are <br /> g <br /> ' shown on Figure 1 in. the Appendix. The boring locations were selected by others and were <br /> located in the field by Hennepin County personnel. Some of the borings had to be moved from <br /> ' their intended location because equipment obstructed access for our drill rig. The ground surface <br /> elevations at the boring locations were referenced to the floor slab of the existi.ng building to the <br /> ' west. The elevation of this floor slab was given as 944.33 on plans provided to us. <br /> ' Drillin� Methods <br /> Our borings were drilled nsing a conventional truck-mounted drill rig equipped with 3-1/4" inside <br /> , diameter hollow-stem augers. � <br /> ' Sam lin e h ds <br /> ' Split Spoon Samples (SS) <br /> The standard penetration(split spoon)samples were collected in general accordance with ASTM: <br /> ' D1586. This method consists of driving a 2" outside diameter split-barrel sampler into the in-situ <br /> soils with a 140 pound weight, dropped from a height of 30". The sampler is driven a total of 18" <br /> ' into the soil. After an initial set of 6",the number of hammer blows required to drive the sampler <br /> the final 12" is l�o� � �e standard penetration resistance, or N-value. <br /> ' <br /> Disturbed Samples (DS� <br /> � Hollow-stem auger samples(disturbed samples)were collected in general accordance with ASTM: <br /> D1452. The samples were taken by drilling tlie hollow-stem auger into the soil, stopping at <br /> 1 <br /> � <br />