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B-3 <br /> 1 8 Ground Water Sam lin <br /> At least three wetted casing volumes of liquid are removed from each well by bailing with a clean <br /> disposable bailer A liquid sample is then collected from each well with a cleaned disposable bailer and <br /> ' transferred into a laboratory supplied sampling container Each sample is appropnately 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 /> ' It 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 8020, 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 10 {Methods} <br /> LRP018 809 <br />