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►. WorkplaDfor Nunan-Obi 7 PageLB 23 Drilling and Sampling 6. All soil borings will be drilled using an appropriate drill rig utilizing a drilling contractor who possesses a C57 drilling license. All borehole logging will be performed by as State Certified Hydrogeologist who will keep a detailed hydrostratigraphic log of each borehole by noting lithologic changes, hydrogeological characteristics, sample locations and depths, and v borehole caving. Groundwater "grab"samples will be collected with a steel bailer if groundwater is encountered. i Sixteen (16) soil samples will be collected, sealed, labeled, and placed in an ice chest at a temperature of four(4) degrees Celsius, and submitted to a State Certified laboratory, under a proper Chainof-Custody, to be analyzed for total petroleum hydrocarbons as gasoline (TPH-p) ►� using EPA Method 8015 modified and for Benzene, Toluene, Ethyl benzene, and Xylenes (BTEX) using EPA Method 8020 and MTBE. Two(2) soil samples will be collected and analyzed for TPH(mo) using EPA Method 8015 modified for motor oil ranged organics and the shallowest of the two soil samples will be analyzed for CAM 17 Metals. L 2.3a Method of Drilling and Sampling of Soil The borings will be excavated with an eight (8) inch hollow-stem auger drill, with `Moot long sections and soil samples will be collected with a two (2) inch inner diameter, three (3) foot long, split spoon sampler at approximate five (5) foot vertical intervals depending upon the soil stratigraphy and contaminants encountered The samples will be obtained by the L. compressive force of a 140 lb hammer dropped from a height of 18 inches. The soil samples will be extruded into six(6)-inch long steel sample liners. The liners, with soil, will be covered with Teflon sheets at each end of the cylinder, capped with plastic end caps, and sealed with"duct tape" to adhere the caps to the liner at each end, to hermetically seal the samples. The soil samples will be labeled with a non-toxic ink field marker as to the depth and location the sample was collected, the sample number, and the project name. The chain-of-custody will be similarly designated and will also include date and time the sample was collected Each sample will be inserted into a plastic, Zip-lock freezer bag and then placed into an ice chest for transport back to the laboratory. The soil samples will be selected at specific vertical intervals based on the location of the capillary fringe, at significant changes in lithology, and/or at contact with noticeable hydrocarbon contamination. A minimum of three (3) soil L samples will be collected and analyzed from each borehole. The sampler will be decontaminated before and after each use by rinsing with an Alconox solution wash and fresh tap water. All rinseate water will be stored in a 55 gallon DOT approved drum. The drum L will be properly labeled and stored onsite until sampling is authorized to establish a legal point of disposal. 23b Groundwater Grab Sampling L If enough groundwater is encountered in the borehole, a groundwater grab sample will be collected A minimum of one groundwater sample will be collected and analyzed from each L L.