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r <br /> 5 <br /> 4 0 SOIL BORING AND SAMPLING <br /> Soil boring and sampling methodology for this phase of work was presented in <br /> Canonie's Work Plan All soil boring and well locations were based on the results of <br /> the soil vapor survey and information obtained during drilling activities <br /> t4 1_. Soil Boring and Sampling Methodolony <br /> Ten soil borings were advanced in the area of the former tanks to depths ranging from <br /> 31 5 to 45 5 feet between September 28, 1992, and October 2, 1992 Six of these <br /> ' soil borings (W-1 through W-6) were converted to vadose zone wells Boring and well <br /> locations are shown on Figure 2 Although the original proposal called for four soil <br /> borings and four 4-inch-diameter wells to depths of approximately 40 feet, field <br /> screening results required field changes to be made to the proposed work <br /> Drilling was performed by Spectrum Exploration Drilling, Inc of Stockton, California <br /> ' Six vadose zone wells and four soil borings were drilled with a truck-mounted CME <br /> 550 drill rig using a 6- to 10-inch outside diameter (OD) hollow-stem auger Soil <br /> samples were collected using an 18-inch long, 2-inch inside diameter (1D) split-barrel <br /> sampler The sampler was driven in advance of the auger by a 140-pound weight <br /> falling 30 inches The number of blows required to drive the sampler 18 inches was <br /> 1 recorded on the Boring Logs for each 6-inch interval Drilling operations were <br /> supervised by a geological engineer, who visually described and lithologically logged <br /> the soil samples in accordance with the Unified Soil Classification System at the time <br /> of recovery Boring Logs are presented in Appendix C All augers and samplers were <br /> steam-cleaned before being mobilized to the site, between each boring, and prior to <br /> leaving the site to prevent cross-contamination Cuttings generated during drilling <br /> operations were placed in 55-gallon drums, which were labeled and stored on-site for <br /> future disposal <br /> W V81 6341REPORTS151TE A551LOCKEFORDVLOCKEFORD RPT fAprll 26 19931 <br /> GSnonieE nv l ron menta! <br />