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Sampling Equipment <br /> Interim gas sampling probes were used to monitor subsurface gases at the .landfill <br /> Each probe consists of a S-foot Long, Jr'nnch diameter stainless Aertmeter. <br /> Bred every 2 inches at the bottom 18 inches to allow for Fn` / ranch holes <br /> gra migrate into the probes. A <br /> pointed tip was welded to the end of the probe for better penctratioa <br /> A ball valve and brass fitting wem installed at the top of each probe to contain gas pressures and <br /> fac. .tate instrumem hook-up to the probe.The valves were left closed c'iccept dMing monitoring <br /> dT instrument reading. Each probe Is tagged with-a brass plate and identified as <br /> through <br /> AGA-90 L,andtec Infra-red-Gas Analyzer was used to monitor methane, carbon.dioxide,(CO:,), <br /> andoxygen(O�Icvels at eachrobe location.The anal <br /> P yzer was calibrated for methane,CO,,and <br /> O;t prior to use in the field_Calibration.logs are.included.in Ofm report <br /> Gas Monitoring - <br /> Ambient air Measurements of methane, oxygen, carbon dioxi <br /> + ; and barometric pressztre vrere 4 <br /> takes at Tach gas pmbe location. Those were mended and the ' ' <br /> ms�trner:t= was • <br /> to the probe. The valve was opened and grobc.gas pressure mcasuxcments were taken <br /> The pxobc was thea purged for. two. probe volumes- -were thou coU=Xed at <br /> a0PrDxi=tely 30- to 60-second . until..a stable. -rtading was .obtained-, These <br /> eats of methane, oxygen, carbon dioxide,and ambient barometric pr=U=w <br /> tre th - <br /> rescordco3 <br /> MOniwrin was also conducted at various locations in three building sites for the <br /> Presence of methane gas. MoniWring vGzs conducted at the omce trailer at the entrance to the <br /> landfill, trailer` boxes- at the service shop, aid trailer boxes at the transfer building. These <br /> locations were monitured for any gas pockets at the foundation and near any opening from the <br /> Saor such as piping holes,electrical conducts,or floor cracks. <br /> LYSVAETERS <br /> Lysimeters were sampled using the following staddard protocol. <br /> 1. Prior to sa p6g lysimeters,the pressure-vacuum eqt ipment is checked.and cleaned. <br /> 94940 a\232oRm A-12 . <br /> COPYrIck 20W 1pc. duly l4,2000 <br />