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05 May 1997 <br /> • AGE-NC Project No 95-0173 <br />' Page 8 of 29 <br />' 4 12 Collection of Ground Water Samples <br /> On 14 November 1997, one ground water sample was collected from IAS well AW-1, logged on a <br /> chain of custody form,placed in a chilled container and transported to Alpha Analytical Laboratories <br /> Inc (AAL) for analysis of manganese and iron <br />' 4 1 3 Field Measurements And Data Collection <br />' Field measurements were collected from wells MW-1 through MW-4, VW-1 and VW-2 throughout <br /> the duration of the IAS pilot test and included induced pressure, organic vapor concentrations, <br /> ground water depth and dissolved oxygen Induced pressure was measured at each well using <br /> Magnehelic differential pressure gauges, organic vapor concentrations were measured at each well <br /> head using an organic vapor analyzer equipped with a photo-ionization detector (PID Thermo <br /> Environmental 580A, 10 0 eV, calibrated to isobutylene), ground water depth was measured using <br /> a Solinst water level meter, and dissolved oxygen was measured using a YSI Model 55 dissolved <br /> oxygen meter Field data collected during the IAS pilot test is summarized on Table 6 <br /> 42 RESULTS OF IN-SITU AIR SPARGING PILOT TEST <br />' 4 2 1 Induced Pressure <br />' A plot of induced pressure (IP) measurements versus time indicated initial increases after only one <br /> to two hours of IAS operation from monitoring wells MW-1 through MW-3, VW-1 and VW-2 <br /> (Appendix F), significant pressure changes were not observed in MW-4 <br /> The greatest IP measurements were recorded from wells MW-I and MW-3 Monitoring well MW-3 <br /> is located approximately 15 feet west of IAS well AW-1, well MW-1 is located approximately 57 <br /> feet east of IAS well AW-2 Generally, IP measurements fluctuated between 0 1 and 0 7 inches of <br /> water in MW-3, induced pressure measurements fluctuated between 0 1 and 0 4 inches of water in <br /> MW-1 <br /> Monitoringpoints MW-2,VW-1 and VW-2 recorded positive IP measurements during the IAS pilot <br /> test Monitoring well MW-2 is located approximately 40 feet south of AW-1, SVE well VW-1 is <br /> located approximately 12 feet east ofAW-1 and 18 feet west of AW-2, SVE well VW-2 is located <br /> annrnvim%t.?ly 10 fPPt wact of A W-1 TP measuremPntc recorded from wells MW-2. VW-1 and VW- <br /> Mj/j./a Vl1AAiM rvaJ w i avrr v.i•vw f+ + ++ ����— — + �—--- - -- <br /> 2 were generally between 0 03 and 0 06 inches of water <br /> • It is not understood at this time why IP observations and distance measurements from MW-1 <br /> Advanced GeoEn�tronmeatal,Inc <br />