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Sampling Equipment <br /> • j <br /> Interim gas sampling probes were used to monitor subsurfaceases at the landfill <br /> $ Perimeter. <br /> Each probe consists of a S-foot long, Yx-inch diameter stainless steeli Y4-inch F Pe= with holes <br /> gered every 2 inches at the bottom 18 niches-to allow for gascs'to migrate into the prober. A <br /> pointed tip was welded to the cud of the probe for better penetration. <br /> A ball valve a ad 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 wereleft closed exc t d <br /> - eP erring monitoring <br /> or ' ent reading. Each probe is tagged with-a brass plate and identified as "GP-1" through <br /> `°GP-10". <br /> A GA-90 Landtcc Infra rcd Cray Analyzer was used to monitor methane, carbon.dioxide.(CO:), <br /> and oxygen(Oa)levels at each probe location.The analyzer was calibrated for methane, COza and <br /> 02 prior to use in the field_Cahbration.logs are.included.in this report <br /> Gas.Monitoring <br /> Ambient air measuri:3nents of methane, oxygen, carbon dioxide; and barom } <br /> e#ic pressure.Were . <br /> taken at each gas probe location- Those readings were recorded and-the Znstr=ent° was <br /> connected to the probe. 'The valve was opened and probc_gas pressure <br /> measurements were taken <br /> The probe was then. purged for. two. probe volumes. Readings-were then collected at <br /> approximately 3.0- to 60-second inter'val's.'unti1._a stable reading was .obtained... These <br /> measurements of methane, oxygen, carbon dioxide, and ambient barometric pressure were then <br /> rcc°rded- Monitoring was also conducted at various locations in three building sites 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, aiid 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 hales,electrical conduits, or.floor cracks. <br /> L'YSR ETERS <br /> Lysimctczs were sampled using the following standard protocol: <br /> 1. Prior to sampling lysimetcrs,the pressure-vacuum equipment is checked-and cleaned. <br /> 849-FO A2314R323 A•12 <br /> 2000 xkwdda.tar. lily 14,200 <br />