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I. H. KLEIN FfIDER x IAFI File No . 5-2008-1 <br /> December 21, 1972 <br /> TABLE I <br /> NOTES TO LOGS OF BORINGS <br /> 1 . *Pressure in pounds per square inch required <br /> to advance sampler 12 inches or depth noted . <br /> 2 . **Number of blows required to drive 2-inch O.D . <br /> sampler 12 inches with a 140 pound hammer falling <br /> 30 inches +. <br /> 3 . Boring depths are referenced to existing <br /> ground surface at time of drilling . <br /> 4 . N - Depth of relatively undisturbed sample . <br />