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Kennedy/Jenks Consultants • Soil borings will be advanced using a portable, hydraulic push/drive sampling system that simultaneously drives two nested, steel sampling rods into the ground to collect continuous soil cores. • As the sampling rods are advanced, the soil core will be collected in a 7/8-inch diameter, 2-foot long sample barrel, which is attached to the end of the inner rods. After being advanced 3 feet, the inner rods will be removed from the borehole with a hydraulic winch. The sampler (containing new stainless steel or brass liners, or a butyrate liner) and inner rods will then be lowered back into the borehole to the previous depth and the rods are driven another 2 feet. This process will be repeated until the desired depth is reached. • The soil samples will be retained for lithologic logging and chemical analyses, if appropriate. • The soils will be classified in the field in approximate accordance with the visual-manual procedure of the Unified Soil Classification System (ASTM D-2488-93), and the Munsell Color Classification. • If required, soil samples will be collected at selected intervals for laboratory analysis. At these intervals, the ends of one or more of the brass or stainless steel liners, or selected portions of the butyrate sample liner will be covered with Teflon end sheets and plastic end caps, and labeled. Labels will document the sample designation, type, date and time of collection, collector(s), location, and any additional information. • After sample collection, the boring will be grouted to ground surface with a neat cement grout (Type II Portland cement) using the tremie method. EQUIPMENT CLEANING • Downhole equipment (rods, sampler) will be steam cleaned prior to each borehole. • Sampling equipment (sampler) will be steam cleaned or washed with a brush in a solution of high-purity phosphate-free soap and potable water, then rinsed with potable water followed by double rinsing with deionized water prior to each sampling run. • Downhole equipment and vehicles which warrant it, will be steam cleaned prior to leaving site at completion of sampling. INVESTIGATION-DERIVED RESIDUALS Soil cuttings will be placed in labeled 5-gallon DOT-approved pails with bolt-on covers. Decontamination water will be contained in labeled 55-gallon DOT-approved drums with bolt-on covers. All residuals generated during sampling activities will be stored at the site. is\job\96\966070.01\workplan\append-a.doc A-2