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� I <br /> Page 5 TL 686-082-02 <br /> 4 . The data obtained from our field and laboratory <br /> investigations were evaluated to develop conclusions <br /> and recommendations with t�egard to the extent of <br /> transformer oil in the soil beneath the underground <br /> tank and equipment. � <br /> i <br /> 4.0 INVESTIGATIVE PROCEDURES f <br /> i <br /> On May 19, 1987, three exploratory borings were drilled at <br /> the locations shown .: on Drawing No. 3 . l1 All field drilling and ! <br /> engineering services were provided by I Twining Laboratories, Inc. <br /> personnel . <br /> The exploratory borings, labeled B-1, B-2, and B-3 as shown <br /> on Drawing No. 3, were drilled using a Mobile B-40 Drill rig <br /> equipped with 8 inch diameter, continuous flight hollow stem <br /> augers . Continuous„=logs of the soils iencountered in the borings <br /> were recorded. Discrete soil samples were collected at the r <br /> following depths throughout the borings s . Boring B-1 was located <br /> at the site of the former location of the 10, 000 gallon <br />{ <br /> transformer oil storage tank and sables were retrieved from <br /> depths of 20 and 25 feet. Soil samples were retrieved from <br /> beneath the productline located between the pump assembly and <br /> i <br /> the con ' <br /> Crete <br /> .lined sump at depths of 8 and 13 feet from boring <br /> B-2 . Boring B-3 was located at the south end of the former C <br /> location of the concrete lined sump and samples were retrieved C <br /> from depths of 10 and 15 feet. These slail samples were collected <br /> i <br /> from locations that correspond to depths of 5 and 10 feet below s <br /> ' <br /> t �' Fresno Modesto Visalia Bakersfield <br />