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1� too, GROUNDWATER TECHNOLOGY STANDARD OPERATING PROCEDURE CONCERNING SOIL SAMPLING METHODOLOGY SOP 14 Soil samples should be collected and preserved in accordance with Groundwater Technology Laboratory' s Standard Operating Procedure (GTL SOP 15 ) concerning Soil Sample Collection and Handling. when Sampling for Volatile Organics. A hollow stem soil auger should be used to drill to the desired sampling depth. A standard 2 inch diameter split spoon sampler 18 inches in length shall be used to collect the samples. The samples are contained in 2 inch diameter by 6 inch long thin walled brass tube liners fitted into the split spoon sampler (three per sampler) . The split spoon sampler should be driven the full depth of the spoon into the soil using a 140 pound hammer. The spoon shall then be extracted from the borehole and the brass tube liners containing the soil sample removed from the sampler. The ends of the liner tubes should be immediately covered with aluminum foil, sealed with a teflon or plastic cap, and then taped with duct tape. After being properly identified with sample data entered on a standard chain of custody form the samples shall be placed on dry ice (maintained below 4°C) and transported to the laboratory within 24 hours. One of the three soil samples retrieved at each sample depth shall be analyzed in the field using a photoioni- zation detector and/or explosimeter. The purpose of the field analysis is to provide a means to choose samples to be laboratory analyzed for hydrocarbon concentrations and to enable comparisons between the field and labor- atory analyses. The soil sample shall be sealed in a plastic bag and placed in the sun to accelerate the vaporization of volatile hydrocarbons from the soil . One of the two field vapor instruments shall be used to quantify the amount of hydrocarbon released to the air from the soils . The data shall be recorded on the drill logs at the depth corresponding to the sample point.