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0 <br /> collected to a total boring depth of approximately 10 feet below grade (fbg). If evidence <br /> of significant petroleum hydrocarbons is discovered in the shallow subsurface soils <br /> beneath the former pipeline ROW based on either field evidence or laboratory analytical <br /> data, then deeper soil borings will be advanced as needed in those areas to assess the <br /> soil conditions at those locations. Based on previous investigations groundwater is <br /> located at a depth of approximately 35 fbg. Additionally, the horizontal extent of soil <br /> impact will be determined,if necessary, by advancing step-out borings perpendicular to <br /> the pipeline ROW. <br /> 2.6 SOIL LOGGING AND SAMPLING <br /> A CRA geologist will supervise the drilling and describe encountered soils from the <br /> borings using the Unified Soil Classification System and Munsell Soil Color Charts. Soil <br /> samples will be collected continuously or at approximate 5-foot intervals in the borings, <br /> for soil description, screening in the field for organic vapors using a flame-ionization <br /> detector (FID), and laboratory analyses. Samples will be submitted for laboratory <br /> analyses at 5-foot intervals and/or at depths where obvious signs of petroleum <br /> hydrocarbon impact are present based on visual, olfactory, and/or FID observations. <br /> CRA will prepare logs for the borings. <br /> Soil samples designated for chemical analysis will be collected in acetate, brass or <br /> stainless steel sample tubes and the ends will be covered with Teflon sheets and plastic <br /> caps. Samples will be labeled, entered onto a chain-of-custody record, and placed into a <br /> cooler with ice for transport to a State of California certified laboratory for analysis. <br /> 2.7 CHEMICAL ANALYSES <br /> Soil samples will be analyzed for total petroleum hydrocarbons as crude oil (TPHc) by <br /> EPA Method 8015B (M), and benzene, toluene, ethylbenzene, xylenes using EPA <br /> Method 8260B. Silica gel cleanup will be used on samples prior to running the EPA <br /> 8015B (M) analysis. The samples will be analyzed on a standard turn-around-time. <br /> 2.8 WASTE DISPOSAL <br /> Drill cuttings and any liquids generated during the investigation will be stored in <br /> 55 gallon steel drums, labeled, and sealed for temporary onsite storage pending receipt <br /> 060223(14) 3 CONESTOGA-ROVERS&ASSOCIATES <br />