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r <br /> am WER.NNW` <br /> GROUNDWATER TECHNOLOGY <br /> STANDARD OPERATING PROCEDURE <br /> CONCERNING SOIL SAMPLING METHODOLOGY <br /> SOP 14 <br /> Soil samples should be collected and preserved in <br /> accordance with Groundwater Technology Laboratory's <br /> Standard Operating Procedure (GTL SOF 15) concerning <br /> Soil Sample Collection and Handling when Sampling for <br /> Volatile Organics. A hollow stem soil auger should be <br /> used to drill to the desired sampling depth. A standard <br /> 2 inch diameter split spoon sampler 16 inches in length <br /> shall be used to collect the samples. The samples are <br /> contained in 2 inch diameter by 6 inch long thin walled <br /> brass tube liners fitted into the split spoon sample,- <br /> (three <br /> ampler(three per sampler) . <br /> En <br /> ra The split spoon sampler should be driven the full depth <br /> of the spoon into the soil using a 144 pound hammer. <br /> The spoon shall then be extracted from the borehole and <br /> the brass tube liners contaiping the soil sample removed <br /> from the sampler. The ends of the liner tubes should be <br /> immediately covered with aluminum foil, sealed with a <br /> teflon or plastic cap, and then taped with duct tape. <br /> After being properly identified with sample data entered <br /> on a standard chain of custody form the samples shall be <br /> placed on dry ice (maintained below 4°C) and transported <br /> to the laboratory within 24 hours. <br /> One of the three soil samples retrieved at each sample <br /> l r depth shall be analyzed in the field using a photoioni- <br /> zation detector and/or explosimeter. The purpose of the <br /> In field analysis is to provide a means to choose samples <br /> kfm to be laboratory analyzed for hydrocarbon concentrations <br /> and to enable comparisons between the field and labor- <br /> atory analyses. The soil sample shall be sealed in <br /> a plastic bag and placed in the sun to accelerate the <br /> vaporization of volatile hydrocarbons from the soil. One <br /> of the two field vapor instruments shall be used to <br /> quantify the amount of hydrocarbon released to the air <br /> from the soils. The data shall be recorded on the drill <br /> logs at the depth corresponding to the sample point. <br />