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Sampling Equipment <br /> lei; <br /> Interim gas sampling probes were used to monitor subsurface gases at the landfill <br /> .perimeter. <br /> Each probe consists of a S-faot long, %-inch diameter stainless steel pipe, with %-inch holes <br /> staggered 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 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 dkcept during monitoring <br /> or instrument reading. Each probe is tagged with-a brass piste and identified w "Gp-l" through <br /> -dP-10". <br /> A GA-90 Landtec Infra-red•Cress Analyzer was used to monitor methane, carbon.dioxide.(Co..,), <br /> and oxygen(0.)levels at each probe location The analyzer was calibrated for methane, COs,and <br /> 02 prior to use in the field_Calibration.logs are.included.in thisreport. <br /> Gas Monitoring <br /> Ambient air measurements of methane, oxygen, carbon dioxl <br /> ie; and barometYic pressure were T <br /> taken at each gas probe ior.�tion. ?hose readings were recorded and-the ins;nrment° was ,` <br /> connected to the probe- The valve was opened and probe-gas pressure measurements were Laken._ <br /> The probe was then. purged fortwo- probe volumes. .Readings•were thea collected at <br /> `a1iPr0xh nat4y 3.0- to 60-.=ad intervals,-unW..a" stable•ieading was .obtained.: These <br /> -mcasurcments of methane, oxygen, carbon dioxide,and ambient barometric pressaxr vire 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 tray-lei-at the entrance to the <br /> landfill, trailer boxes- at the service shop, aid 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 floor cracks. <br /> LYSWETERS <br /> Lysimeters were sampled using the following standard protocol: <br /> 1- Prior to sampling lys='eters,the pressure-vacuum equipment is checked•and cleaned. <br /> Z-42394940 1\23 I opiz A•12 3Uly 14,2000 <br /> CoPi(Ick 2000 xkwcwer.to, <br />