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Sampling Equipment <br /> Interim gas sampling probes were used to monitor subsurface ases at the landfill <br /> g .perimeter. <br /> Each probe consists of a 5-foot long, grinch diameter stainless steel pipe, with y inch holes <br /> staggered every 2 inches at the bottom 18 inches to allow for gases:to migrate into the probcs. A <br /> pointed tip was welded to the cud of the probe for better penetration <br /> A ball valve and brass fitting were installed at the top of each probe to contain gas pressures and <br /> facilitate instrument hook-up to the probe.The valves vera left closed e6ccept during monitoring <br /> or instrument reading. Each probe is tagged with-a brass plate and identified as "GP-1" through <br /> "GP-10". • . <br /> AGA-90 Landtec Infra-md•Gas Analyzer was used to monitor nethan-, carbon.dioxide.(CO,), <br /> and oxygen(02)Ievels at each probe location.The analyzer was calibrated for methane,CO2,and <br /> Oz prior to use in the field-Calibration.logs are.ineluded.in this report, <br /> Gas Monitoring - <br /> Ambient air measurements of methane, oxygen, carbon dioxide; and barome#ric•pressum.were'. " <br /> taken at each gas probe location. Those readings were recorded and the instrument, was <br /> connected to the probe. 'Ihe valve was opened and probe.gss pressure mets were taken._ <br /> The probe was then. purged fortwo. probe volumes. Re:adungs-were then collected at <br /> approximately 3.0- to 60-secoad fixtcrvats.'until_.a stable reading was obtained._. These <br /> xneasMvnIents of methane, oxygen, carbon dimade„and ambient barometric pressure were then - <br /> recorded. Monitoring was also conducted at various locations in three building sites for the - <br /> prest-ni a of methane gas. Monitoring was conducted at the office trailer at the entrance to the <br /> laudfin, trailer boxesat the service shop, grid trailer boxes at the transfer building. Tbese <br /> locations were monitored for any'gas pockets at the foundation and near any opening from the - <br /> floor sztch as piping holes,electrical conduits,or Poor cracks. <br /> LYSWETERS <br /> Lysime'tcis were sampled using the following standard protocol: <br /> 1. Prior to sampling lysimeters,the pressure-vacuum equipment is checked•and cleaned, <br /> Z3-483849-Fo IU3lap-lap-TZ -12 1 . <br /> 2000 K1eiatClder.los, <br /> �'" July 14.2000 <br />