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Section No 6 <br /> Revision No 1 <br /> Date January 13, 1992 <br /> Page 52 of 55 <br /> pump used discharge volumes and rates and other relevant data will be <br /> recorded <br /> 6 10 in-Situ Subsurface Exploration and Testing <br /> 6 10 1 Standard Penetration Tests (SPT) <br /> Standard penetration tests will be utilized for evaluating the strength <br /> and/or relative density of soils in-situ This test will be performed in <br /> general conformance with ASTM Standard D 1586-67 - - - <br /> The test will be performed with a 1-3/8-inch I D , 2-inch O D split <br /> barrel standard penetration sampler The sampler is driven into the bottom <br /> of the borehole using a 140-pound hammer dropping 30-inches in free fall <br /> The procedure is generalized as follows <br />- �-�-� - - - - ■ = clean=the-'boring-=of--a11-loose=material-and=material=disturbed7by-- <br /> drilling before inserting sampler <br /> ■ administer a few light taps with the hammer to seat sampler, <br /> ■ drive the sampler at lest 18 inches, or until normal maximum <br /> resistance (refusal) is reached, using the standard hammer and drop <br /> (refusal is defined as a penetration of less than 6 inches for 100 <br /> hammer blows) , <br /> ■ count and record the blows required to drive each 6 inches of <br /> penetration, and <br /> ■ obtain a consistent 30-inch free-fall drop of the hammer with two <br /> wraps of a rope around the cat-head on the drill rig (Cables <br /> attached to the hoisting drum should not be used since it is <br /> difficult to obtain a free fall) <br /> Sample intervals and blow counts will be recorded in the borehole log in <br /> addition to the USC description of the corresponding lithology <br /> 0 <br /> 6-52 <br />