Laserfiche WebLink
Page 3 TL 6$6-141-00 # <br /> 1 <br /> i..: 4 . 0 SAMPLING AND TESTING PROCEDURES <br /> On September 24 ,, 1986 , three - ex.�ploratory borings were <br /> drilled and three surface soil samples were collected at the <br /> locations shown on Drawing No . 2 . !All field drilling and <br /> engineering services were provided by Twining Laboratories , Inc . <br /> personnel . <br /> Each exploratory boring was drilled using a Mobile B-40 <br /> drill rig equipped with 8-inch diameter , continuous flight hollow <br /> augers . Continuous logs of the soil encountered in each boring} <br /> were recorded . Representative soil samples were obtained from <br /> r <br /> each boring at the same depth as the Ibottom of the transformer <br /> h <br /> oil storage tank ( approximately 15 feet below surrounding ground <br /> level ) and a depth of 5 feet below the;) bottom of the transformer= <br /> oil storage tank ( approximately 20 feet below surrounding ground <br /> level ) . Each soil sample was obtained by pushing or driving a <br /> thin-walled steel sampler approximately 18 inches into the soil . , 1 <br /> The steel sampler was cleaned by washing with a hot water ( steam) <br /> I <br /> washer between sampling intervals . The lead auger and associated � <br /> { J <br /> drilling equipment was cleaned by washing with the hot water <br /> ( steam) washer between borings . After all soil samples had been <br /> obtained , each exploratory boring) was backfilled with a <br /> bentonite-cement slurry . The soil cuttilgs from each boring were <br /> placed adjacent to the location of the borings . i <br /> 1 <br /> Soil samples were also obtained from the project site at j <br /> selected surface locations in the area of the transformer oil" <br /> tie -7 aa�oWNW. # <br /> Fresno Modesto Visalia Bakersfield <br /> � it <br />