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v <br /> MURRAY & ASSG RTES <br /> ENVIRONMENTAL SERVICES <br /> �:. <br /> James M. Langston <br /> April 7, 1992 <br /> Page 2 <br /> The drilling activities were performed under the supervision of a California Registered <br /> Geologist who selected the boring locations and logged the borings as they were drilled. <br /> During drilling, soil samples were collected at appropriate depth intervals (9, 14 and 17 <br /> feet) using a driven tube sampler equipped with extension rods and a:'single clean one <br /> inch-diameter stainless steel tube. <br /> Observations and. Findings i <br /> The results of the field PTD screening of soil samples collected are presented below in <br /> Table 1. Soil samples collected were at 9, 14 and 17 feet below the ground surface. The <br /> 9-foot sample would correspond to a depth of approximately 1-foot below the bottom of <br /> the tank, while the 17-foot sample would be representative of the capillary fringe zone. <br /> The presence of contamination in the sample collected from 17 feet would indicate that <br /> groundwater at that location is contaminated. <br /> �. Table 1 <br /> Field Vadose Readings (580B PID) <br /> Boring No. Total Depth PID Reading <br /> I <br /> SB-1 9 Ft. 0 <br /> SB-1 14 Ft. 0 <br /> SB-1 17 Ft. 249 <br /> SB-2 9 Ft. 0 <br /> _. SB-2 14--Ft. v , 0.- <br /> SB-2 17 Ft. 47 <br /> SB-3 9 Ft. 0 ! <br /> SB-3 14 Ft. 0 f <br /> SB-3 17 Ft. 0 <br /> SB-4 9 Ft. 0 <br /> SB-4 14 Ft. 14 <br /> SB-4 17 Ft. 7 <br /> SB-5 9 Ft. 729 <br /> SB-5 14 Ft. 1279 <br /> SB-5 17 Ft. 854 <br />