Laserfiche WebLink
10 June 1999 <br /> AGE-NC Project No 97-0290 <br /> Page 5 of 26 <br />' (installed with SWI and SW2) were utilized for observation points Each well was fitted with <br /> removable air-tight well caps, valves and tubing for monitoring pressure/vacuum in each well <br /> 3 12 Field Measurements And Data Collection <br /> Field measurements, collected from the observation wells throughout the duration of the IAS pilot <br /> test, included induced pressure, ground water depth and dissolved oxygen Induced pressure was <br /> measured at each well using Magnehelic differential pressure gauges, ground water depth was <br /> measured using a Solinst water level meter, and dissolved oxygen was measured using a YSI Model <br /> 55 dissolved oxygen meter Field data collected during the TAS pilot test is summarized on Tables <br /> 8 and 9 <br /> 32 RESULTS OF IN-SITU AIR SPARGING PILOT TEST <br /> 3 2 1 Induced Pressure <br />' A plot of Induced pressure (IP) measurements versus time indicates immediate increases after <br /> initiation of sparging at SW2 The greatest IP measurements were recorded at vapor point SW2C, <br /> directly above the sparging point, and In V W 1 C, located approximately 10 feet from SW2 Mutually <br /> consistent IP measurements were recorded in wells SWIB, SW2B and VW1B, all screened at <br /> approximately 33 feet bsg Soil near 33 feet bsg appears to be very permeable and continuous <br /> laterally Despite high IP measurements at S W2C and V W 1 C, measurements recorded at S W I C, <br /> MW2 and MW1 did not show as great of an increase in IP, indicating either less lateral continuity <br /> or more vertical continuity A vacuum was measured at S W2A and low IP at V W 1 A, indicating little <br /> vertical continuity However, IP was measured at S W 1 A Induced pressure over time is plotted on <br /> Figures 7A, 7B and 7C Field data is summarized on Table 9 <br /> 3 2 2 Dissolved Oxygen <br /> A plot of dissolved oxygen (DO) measurements versus time during the IAS pilot test indicated very <br /> little increases in DO readings at surrounding wells during sparging at SW2 High dissolved oxygen <br /> Iwas measured in SW2 following sparging However, concentrations decreased to near background <br /> after approximately 36 hours <br /> During sparging at SWI, slightly increased concentrations of dissolved oxygen were observed at <br /> . MW2 after approximately 36 hours DO measurements are summarized in Table 8 DO <br /> Imeasurements versus time are plotted on Figures 8A and 8B <br /> Advanced GmEnvironmental,Inc <br /> I <br />