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5.0 QUALITY ASSURANCE/QUALITY CONTROL A quality assurance/quality control (QA/QC) program was implemented during the Corral Hollow Sanitary Landfill ASWAT testing to produce accurate, precise, and complete data. The QA/QC program is divided into two major parts: field quality control and laboratory quality control . 5.1 FIELD QUALITY CONTROL 5. 1.1 Equipment Calibration Before field sampling, the following equipment checks and calibrations were performed: • Leak check - The ambient air samplers and the well sam- pling pump were inspected for loose fittings and leaks. A positive pressure leak check was performed with a soap solution. • Pump flow calibration - The inline rotometers were veri - fied against a reference bubble flow meter just before the sampling event. • Meteorological station calibration - The meteorological station was set up and operations checked. If the wind vane direction data output did not correspond to the wind vane's direction, an electronic calibration was performed for both wind direction and wind speed. • OVA calibration - The OVA is factory-calibrated and should not require calibration unless the analyzer is repaired. However, a complete check of the system and verification of the calibration was performed before the sampling event. To check calibration of the OVA, ultra- pure air is used to zero the analyzer and 100 ppm methane gas standard is used to calibrate the span of the ana- lyzer. GasTech meter calibration - In the office or field the GasTech meter was leak checked, the oxygen detector Cali- brated, the percent gas detector calibrated against a 47.4 percent methane gas standard, and the percent lower explosive limit (LEL) detector calibrated against a 2.5 percent methane gas (50 percent LEL) standard. PJ9 9390304.00D 5-1 Rev. 0 09/20/88