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over the liquid near the edge of the evaporation pond on the site (see <br />Figure 1) as required in the Guidelines. <br />2.2 WELL DETAILS <br />The gas monitoring well details are presented in the ASWAT proposal <br />(see Appendix A). Construction details are provided in Appendix C. <br />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 25 and <br />26, 1988, 2 months after their installation. A technician attached a <br />pump to the nipple in the well cap and drew out at least two well <br />volumes of entrained gas and air to purge the well. <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 on a GasTech meter to provide a quality <br />control (QC) check on laboratory test results for methane. During <br />sampling and transport, the Tedlar bag was kept in a light -sealed <br />cardboard box at all times to prevent exposure to sunlight which could <br />degrade the compounds of interest. <br />Within 72 hours of collection, the landfill gas samples were analyzed <br />for the following compounds to satisfy the requirements in Guidelines: <br />PJ9 9390405.00D 2-2 Rev. 0 09/07/88 <br />Emon Associates <br />