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I21 May 2003 <br /> AGE-NC Project No 95-0130 <br /> Page 14 of 16 <br /> Environmental Instruments Inc ) The samples will be collected in Tedlar bags and transported to a <br /> DHS-certified laboratory in a chilled container under ice and under chain-of-custody <br /> I Induced vacuum will be measured utilizing a Magnehelic vacuum gauge attached to the Inlet and <br /> outlet of the vapor extraction system, SVE air flow will be monitored using a Dwyer DS-200 flow <br /> sensor The SVE air flow along the influent and effluent-lines will be monitored weekly for the <br /> I presence of organic vapor using an organic vapor analyzer(OVA)equipped with a photo-Iomzation <br /> detector(PID Thermo Environmental 580A, 10 0 eV,calibrated to isobutylene) Sampling ports will <br /> be installed upstream of the vacuum blower inlet to recover SVE Influent air flow vapor stream <br /> samples, and downstream of the catalytic oxidizer to recover effluent SVE air flow samples to <br /> monitor the efficiency of hydrocarbon destruction <br /> 4 4 2 Soil Vapor Extraction System Maintenance <br /> IThe SVE system will be maintained on a weekly basis, according to manufacturers <br /> recommendations After stabilization, routine maintenance would represent the only periods of <br /> "down time" for the unit One to two times each month(assuming 24-hour operation), the unit will <br />' be shut down for routine maintenance procedures such as oil/filter changing, maintenance and <br /> system inspections and adjustments <br /> I <br /> 4 5 GROUND WATER PUMP AND TREAT SYSTEM <br />' From wells EW-1 and EW-2, extracted ground water will be routed through a 1,000-gallon holding <br /> tank,from which it will pass through a process pump and a 1-micron sediment bag filter One 1,000- <br /> gallon poly tank will be used to temporarily store extracted water prior to processing, the holding <br /> tank is equipped with various level control switches which serve to control the rate at which <br /> extracted water is introduced into the treatment vessels,to provide safety shutoff capabilities and to <br />' allow coarser sediment to settle out prior to treatment The process pump is located directly behind <br /> the holding tank <br />' The first two stages of treatment media are contained in two 2,000-pound GAC absorption vessels, <br /> the final two stages of treatment media are contained in two 1,500-pound SunSolve absorption <br /> vessels The first two vessels will be designed to adsorb TPH-g, TPH-d, BTEX and chlorinated <br />' solvent compounds The final two vessels will contain SunSolve, a liquid phase filtration media <br /> specifically designed to adsorb fuel oxygenated compounds(I e TAME,MTBE and TBA) Sample <br /> ports are located between all vessels to allow detection of potential media break through and to <br />' obtain final discharge samples The system layout is depicted In Figure 8 <br />' Advanced GeoEnviron mental,Inc <br /> 1 <br />