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Subsurface hweWS*tiat Report <br /> Chars group Property,Tracy,CA <br /> Project No.w0661 <br /> January 15,1993 <br /> 4.0 FIELD WORK <br /> 4A DrIHInL, <br /> On December 14, 1992, RESNA personnel advanced nineteen shallow soil borings (SB-1 <br /> through SB-19) to evaluate whether any impact to soil and/or groundwater beneath the site <br /> has occurred as a result of the abandoned oil pipeline. Drilling was conducted by Spectrum <br /> Exploration (C57 512268) using 6-inch outside diameter hollow stem augers. <br /> �. The borings were drilled along the southern property boundary at intervals of 100-to 150- <br /> feet, ' <br /> The <br /> '. .3 <br /> locations of the borings were chosen to avoid a City water main located` in the right-of-way <br /> and an irrigation pipeline located 100 feet north of the center of the tracks. <br /> Borings SB-1 through SB-10 and SB-12 through SB-19 were drilled to a depth of 5 feet <br /> below <br /> grade and sampled from 5 to 6.5 feet below grade• <br /> n� <br /> ; . After sampling, the <br /> borings were 44160Figure 3 shows the locations of the soil borings. <br /> Drilling augers were steam cleaned between each boring to prevent cross-contamination. <br /> 4.2 it m 1' <br /> .� � m= and Descriptions <br /> Soil samples were collected at 5-foot intervals above the soil/water table interface. The soil <br /> samples were collected from each boring with a 2-inch split spoon sampler containing three <br /> brass sleeves. A field geologist was present to log the soil samples according to the Unified <br /> } Soil Classification System. <br /> 4 <br /> Soils encountered in the borings consisted primarily of lean clay and elastic silt. A thin lens <br /> ! of poorly graded sand was encountered in boring SB-11 at approximately 15 feet below <br /> WWRTM1218M NL 3 <br />