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2.3 SAMPLING EQUIPMENT <br /> The equipment used in sampling landfill gas is described in the ASWAT <br /> proposal (see Appendix A) . <br /> 2.4 SAMPLING AND ANALYSIS PROCEDURES <br /> 2.4. 1 Landfill Gas Wells <br /> Field personnel sampled the gas monitoring wells on February 17 and <br /> April 7, 1988, at least 24 hours after their installation. A techni - <br /> cian attached a pump to the nipple in the well cap and drew out at <br /> least two well volumes of entrained gas and air to purge the well . <br /> The well was sampled immediately after it was purged. <br /> To sample a gas monitoring well , the technician attached a 10-liter <br /> Tedlar bag to the pump discharge line and drew a sample at a pumping <br /> rate of about 1 liter per minute. Immediately after the well was sam- <br /> pled, a reading was taken in the field on a GasTech meter to provide a <br /> quality control (QC) check on laboratory test results for methane. <br /> During sampling and transport, the Tedlar bag was kept in a light- <br /> sealed cardboard box at all times to prevent exposure to sunlight <br /> which could degrade the compounds of interest. <br /> Within 72 hours after collection, the landfill gas samples were ana- <br /> lyzed for the following compounds to satisfy the requirements in the <br /> Guidelines: <br /> • VOCs: vinyl chloride, benzene, ethylene dibromide, <br /> 1,2-dichloroethane, methylene chloride, tetrachloroethyl - <br /> ene, carbon tetrachloride, 1,1, 1-trichloroethane, tri- <br /> chloroethylene, and chloroform <br /> • Major landfill gas components: methane, oxygen, nitro <br /> gen, and carbon dioxide <br /> PJ9 9390304.00D 2-2 Rev. 0 09/20/88 <br />