SITE INFORMATION AND CORRESPONDENCE

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Kennedy/Jenks Consultants TYPICAL PROCEDURES WW � • Applicable drilling permits will be obtained prior to mobilization. • Sample locations will be cleared for underground utilities. f ! • All downhole equipment will be steam.cleaned prior to use at each location. • 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 1-7/8-inch i diameter, 3-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 liners) and inner rods will then be lowered back into the borehole to the previous depth and the rods are driven another 3 feet. This process will be repeated until the desired depth is reached. I • 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 soil sample liners will be covered_ with 11 Teflon end sheets and plastic end caps, and labeled. Labels will document the sample i designation, type, date and time of collection, collector(s), location, and any additional information. • If groundwater samples will not be collected, the soil borings will be grouted to the ground surface with a neat cement grout (Type 11 Portland cement) using the tremie method. • Upon encountering the uppermost groundwater surface during sampling, the sample barrel and inner rods will be removed and the well screen and casing will be installed within the outer drive casing to facilitate collection of a groundwater sample. The drive casing will.be pulled up approximately 3 feet to expose the slotted PVC casing. Groundwater samples will then be collected from within the PVC casing with a 3/4-inch .E diameter Teflon or stainless steel bailer.. The depth to groundwater will be measured prior to groundwater sampling. The sample will be drained directly from the bailer into sample containers. The containers will be labeled to document the sample designation, type, date and time of collection, collector(s), location, and any additional information. i:Nob\951950073.001rp11warkplanlappend-a.doc - - A-2 '- Y�� Imo#* a i` • uownhole equipment (rods, sampler) will be steam cleaned prior to each borehole. • i 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. i I • Downhole equipment and vehicles which warrant it, will be steam cleaned prior to E 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 and groundwater residuals will be contained in labeled 55-gallon ; DOT-approved drums with bolt-on covers. All residuals generated during sampling r activities will be stored at the site. 1� r i r 4� i i t �" i:yob495t950673.001rphworkplanlappenda.doc A-3