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<br />MATERIALS TESTING SERVICE <br /> <br />samples were removed from the auger cuttings or from a sixty- <br /> <br /> <br />inch flap valve spoon sampler. All soil samples were field <br /> <br /> <br />extracted, identified as to boring number and depth, preserved <br /> <br /> <br />in moisture-proof plastic, and transported to the laboratory <br /> <br /> <br />for further tests and evaluatio~s. <br /> <br />FIELD ELECTRICAL RESISTIVE ANALYSIS: <br />The electrical resistive -method of subsurface investigation-was-- <br />emp.:Loy.ed'''Pr ior,~~to-'\rlri>l:ring,~-::-iden'l: :ic-fy"'lI)oisture'~I-eve-h> "Witfiin ~ <br />the =-daIIi .~-" Adcii-tiona.B.-y i _cdul:'wg-"t-hXs.C'investC'i:gat-3oeu'O-Sevexar:sus-=- <br />picious--void"- spaces were-diagnos-ed and d-r-ilrings -were - undertaken <br />at those locations. <br /> <br />i'.,..i <br /> <br />ELECTRICAL RESISTIVITY: <br /> <br /> <br />The electrical -resistivity -test- is used to determine the rela-_ <br /> <br /> <br />tive density of the underlying strata in conjunction with drill- <br /> <br /> <br />ed test holes; this method of evaluating the subsurface can be <br /> <br /> <br />more explicit than individual test holes. - The electrical re- <br /> <br /> <br />sistivity defines areas where material has a uniform density <br /> <br /> <br />indicating a material that is consistant; as example: rock, <br /> <br /> <br />concrete or steel. The method is used to search for water <br /> <br /> <br />due to radical changes_in the readings, indication of water by <br /> <br /> <br />a sudden-~ncrease in re~istivity. A slow dropping of the re- <br /> <br /> <br />sistivity indicates that the material is becoming denser than <br /> <br /> <br />the preceedinglayerof measured resistance. <br /> <br />ENGINEERS <br /> <br />...,3- <br />