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Sampling Equipment - <br /> " ni <br /> Interim gas saaanplin9 probes were used to monitor subsurface gases at the landfill Perirn,ter. <br /> Each probe consists of a S-font long, Yvinch diameter staiWess steel pipe, with /.inch Notes <br /> staggeyed every 2 inches at the bottom 18 inches-to allow for gases:to migrate into the probes. A <br /> pointed tip was welded to the end of the probe for better penetration <br /> A ball valve and brass fitting were inrAed at the top of each probe to contain gas pressures and <br /> facilitate instrument(took-up to the probe.The valves were left closed except during monitoring <br /> or inStrurnent reading.Each probe is tagged 'with-a brass plate and identified as "GP-1" through <br /> AGA-90 Landtcc Infra-.red Gas Analyzer was used to monitor methane, carbon.dioxide.(COQ, <br /> and oxygen(02)levels at each probe location.The analyzer was calibrated for methane, COx,and <br /> OZ prior to use in the field_Caiibration.Logs are.included.in aft report.- <br /> Gas Monitoring ; <br /> Ambient air m ents of methane, oxygen, carbaar dio)dde; and barometric pre==-Wert <br /> takea at each <br /> gas Probe location Those readings were recorded and-the insirunurent- was . <br /> connected to the probe.'The valve was opened and probc.gas P measurements were taken. <br /> Tfic probe was thm purged for. two. probe volumes, gs'were thou collated at <br /> xiraatcly 3.0- to nd intervals.•cmtil..a stable-icading was .obtained-, These <br /> m ents of methane, oxygen, carbon dioxide,and ambient barometric pre==were then - <br /> recorded- Monitoring was also conducted at various locations in three building sites for the <br /> PrCSCUte of methane gas. Monitoring was conducted at the office trarTccs--at the=trancc to Clic <br /> landfill, trailer boxes at the service shop, aid trailer bones at the transfer building. These <br /> locations were zoo ' for arty gas pockets at the foundation and near any opening from the <br /> floor such as piping holes,electrical conduits,or floor cracks. <br /> LYSWETERS <br /> Lysimeiteis were sampled using the following standard protocol: <br /> !. Prior to S=pting lysimetcrs,the pressure-vacuum equipment is checked.and cleaned <br /> 844-FOtlORF2i A-12 <br /> .�. hrty 14,2000 <br />