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Sampling Equipment <br /> .Interim gas sampling probes ries at were used to monitor subsurface <br /> g the landfill perimeter. . . <br /> Each probe consists of a S-faot long, %-inch diameter Stainless steel pipe, with Yl-inch holes <br /> aftggered every Z 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 bstn=ent hook-up to the-probe. The valves were left closed ekcept during monitoring <br /> or irmtrument 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.(Co.,), <br /> and oxygen (OD levels at each probe location.The analyzer was calibrated for methane, COx, and <br /> 02 prior to use in the field_.Calibration.logs are.included.in this report, <br /> Gas Monitoring <br /> Ambient air <br /> measurements of meihauc, o - <br /> xygen, carbon dioxide; and barometric-pressure-Were � <br /> taken at each gas probe location. Those readings were recorded and•the inmso went was <br /> connected to.the probe. --The valve was opened and, robc.gas pressure <br /> measurements were taken <br /> The probe was then. purged for two. prone volumes. .Readings-were then collected at <br /> 4PrOximatcly 3.U- to 60-5econd intervals,-until._a stable- reading was .obtained_: These <br /> -m cuts of methane, oxygen, carbon dioxide, and ambient barometric pressure vmm then <br /> recorded. Monitoring was also conducted at various locations in three building situ 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 /> Door such as piping holes,electrical conduits,or floor cracks. <br /> LYSIMETERs <br /> L ctc-rs were sampled using the following standard protocol: <br /> 1• Prior to sampling lysimeters, the pressure-vacuum equipment is checked.and cleaned. <br /> 849-Fo1\2310M A-12 July 14,2000 <br /> 2000 kklo, do.tp,- <br />