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Union Safe Deposit Workplan <br /> 5.0 METHODOLOGY <br /> 5.1 Drilling and Soil Sampling <br /> Drilling will be performed utilizing a truck mounted drill rig equipped with <br /> flight hollow-stem auger. An Augeas geologist or engineer will be present <br /> during drilling to assist in obtaining relatively undisturbed samples of the <br /> subsurface materials,to maintain a log of borings,to field screen samples with <br /> a device capable of detecting volatile organic hydrocarbons as a trace gas,and <br /> to make observations of the site conditions. <br /> Subsoils will be sampled at approximate 5-foot vertical intervals (or more <br /> frequently as deemed appropriate by the field geologist or engineer), com- <br /> mencing at an approximate depth of five feet below the existing grade.Samples <br /> will be obtained by means of a California Modified sampler which was lined <br /> with brass sleeves or rings.The samples will be advanced by blows from a 140 <br /> pound hammer falling 30 inches.Soil will be classified according to the Unified <br /> Soil Classification System. <br /> Upon retrieval, samples retained for chemical analysis will be contained with <br /> aplastic cap over a teflon seal,and taped at each end.The samples will be placed <br /> into a cooler chest on "blue ice" under proper chain-of-custody protocol for <br /> shipment to the analytical laboratory. <br /> It is anticipated that one of the borings will be utilized in gathering a <br /> Hydropunch water sample. All borings will be back-filled upon termination <br /> with a sand-cement grout to the surface grade. <br /> 5.1 LABORATORY ANALYSES <br /> The following methodologies will be specified for the chemical analyses of <br /> soil and groundwater samples: <br /> • EPA Method 503.1 or 602/8020 for BTEX <br /> • EPA Method 8015 (modified) for Total Petroleum Hydrocarbons <br /> as gasoline and diesel <br /> The laboratory analyses will be focused on the detection of compounds <br /> commonly associated with gasoline. <br /> Proint Number: UNS622 Page 6 of 8 <br /> I <br />