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! 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 SOP 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 18 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 sampler <br /> (three per sampler) . <br /> The split spoon sampler should be driven the full depth <br /> F, of the spoon into the sail using a 140 pound hammer. <br /> The spoon shall then be extracted from the borehole and <br /> the brass tube liners containing 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 belovy 4°C) and transported <br /> to the laboratory within 24 hours. <br /> One of the three soil samples retrieved at each sample <br /> depth shall be analyzed in the 'field using a photoioni- <br /> zation detector and/or explosimeter. The purpose of the <br /> field analysis is to provide a means- to choose samples <br /> to be laboratory analyzed for hydrocarbon concentrations ; <br /> and to enable comparisons between the field and..:labor- <br /> atory analyses.. The soil sample sahall: he sealed in <br /> _ aplastic bag and placed in the sun ta .accelerate the <br /> vaporization of .volatile hydrocarbons from the sail. 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 />