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Sampling Equipment <br /> Interim gas piing probes were used to monitor subsurfaceases at the landfill <br /> g Perimeter. . . <br /> Each probe consists of a 5-foot long, %cinch diameter stainless steel pipe, with '/._inch hales <br /> staggered every 2 inches at the bottom 18 niches-ta allow for gases'to migrate into the proms, A <br /> pointed tip was welded to the end of the probe for better penetration. <br /> A ball valve and brass fitting acre installed at the top of each probe to contain gas pressures and <br /> facilitate instrument hook-up to the probe. The valves were left closed e7ccept during monitoring <br /> or ' ent reading. Each probe is tagged with-a brass plate and identified as "GP-1" through <br /> "GP-10". <br /> AGA-90 Landtec infra-red•Gas .Analyzer was used to monitor methane, carbon.dioxide.(COQ, <br /> and oxygen (0)levels at each probe location.The analyzer was calibrated for methane, CO,,and <br /> Oz prior to use in the field-Calibration.logs are.included.in this report. <br /> Gas Monitoring <br /> Ambient air measurements of methane, oxygen, carbon dioxide; and barometric-pressure-were <br /> • taken at each gas probe location. Thosc readings were recorded <br /> _ and•the u�sttuincnt� was <br /> connected to the probe. 'The valve was opened and probe.gas pressure measurements were taken. <br /> The probe was then. purged for two. probe volumes. Readings - were then collected at <br /> approximately 30- to 60-second intervals,'until..a stable reading was .obtained.: These <br /> meaSUrements of methane, oxygen, carbon dioxide, and ambient barometric pressure acre then <br /> recorded. Monitoring was also conducted at various locations in three building sites for the <br /> presence of methane gas. Monitoring was conducted at the office trailer at the entrance to the <br /> Landfill, trailer boxes at the service shop, and trailer boxes at the transfer building. These <br /> locations were monitored for any gas pockets at the foundation and near any opening from the <br /> floor such as piping holes, electrical conduits,or Boor cracks. <br /> LYSWETERS <br /> Lysimetcrs were sampled using the following standard protocol: <br /> 1. Prior to sampling lysimcters, the pressure-vacuum equipment is checked and cleaned. <br /> 10 <br /> 849-F0 M IOR325 A-12 ply 14,2040 <br /> MKkwdder.6-- <br />