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B-3 <br /> transferred into a laboratory supplied sampling container. Each sample is appropriately labeled and stored <br /> on ice from the time of collection through the time of delivery to the laboratory. Ground water samples are <br /> transported to the laboratory and analyzed within the EPA-specified holding times for the requested <br /> analyses. <br /> 1.9 Liquid-Phase Petroleum Hydrocarbons <br /> If liquid phase petroleum hydrocarbons are present in a well, the thickness of the petroleum layer is <br /> measured by collecting a sample in a transparent disposable bailer with a check valve at the bottom, or by <br /> measurement using appropriate fluid-level sounding equipment. <br /> 2.0 ANALYTICAL PROCEDURES <br /> Soil and ground water samples submitted to the laboratory will be analyzed for benzene, toluene, <br /> ethylbenzene, and total xylenes using EPA Method 80201, methyl tertiary butyl ether using EPA Method <br /> 8260, and total purgeable petroleum hydrocarbons as gasoline using EPA Method 8015 Modified. <br /> 3.0 QUALITY ASSURANCE PLAN <br /> This section describes the field and analytical procedures followed throughout the investigation. <br /> 3.1 General Sample Collection and Handling Procedures <br /> Proper collection and handling are essential to ensure the quality of a sample. Each sample is collected in a <br /> suitable container, preserved correctly for the intended analysis, and stored prior to analysis for no longer <br /> than the maximum allowable holding time. Details on the procedures for collection and handling of soil <br /> samples used on this project can be found in Section 1.0(Methods). <br /> LRP015.909 <br />