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iYr _IL ! ( ' 2l Y �AivSJ L! E"f 5 ^ i 1 h n'Si a.♦U..J_ � i . t ' �- .�("` c d.. ' .?..i.`.-t;s`t.r..s'i._�. ..�..!s..:r....-.:-.:itr <br /> Ss )e ::,��F.N,b? <br /> 15 February 2000 <br /> AGE-NC Project No 98-0448 <br /> Page 9 of 33 <br />' are screened through the upper sand and intervening silt/clay Well EW-1 is screened in the <br /> intervening silt/clay and upper sand (See Figures 5 and 6) <br /> 4 1 1 System Installation and Set-Up <br /> The IAS pilot test consisted of two-inch diameter PVC piping installed above ground from a <br /> temporary air compressor to the top of well MW-4B (screened 45 feet to 50 feet bsg) Compressed <br /> air was supplied to MW-4B at a pressure of approximately 15 pounds per square inch (psi)_ <br /> Approximately 13 psi was required to overcome the water column in MW-4B, wells MW-1, MW-2, <br /> EW-1, MW-4A and MW-6 were utilized as observation points during the IAS pilot test Each <br /> observation point was fitted with an air-tight, PVC well slip cap, the slip caps were fitted with a <br /> brass valve and an attached polyethylene tube for monitoring induced pressure (IP), organic vapor <br /> (OV) and dissolved oxygen(DO) <br /> 4 12 Collection of In-Situ Air Sparging Ground Water Sample <br /> On 02 November 1999, one ground water sample was collected from extraction well E W-1, logged <br /> ' on a chain of custody form, placed in a chilled container and transported to McCampbell Analytical <br />' Inc (MAI) for analysis of manganese and iron <br />' 4 13 Field Measurements And Data Collection <br /> Field measurements were collected from wells MW-1, MW-2, EW-1, MW-4A and MW-6 <br />' throughout the duration of the lAS pilot test and included IP measurements, OV concentrations, <br /> depth to ground water measurements and DO measurements IP was measured at each observation <br />' point using Dwyer Magnehelic differential pressure gauges, OV concentrations were measured at <br /> each well head using a OVM equipped with a PID, ground water depth was measured using a Solinst <br /> water level meter, and DO was measured using a YSI Model 55 dissolved oxygen-meter Field data - <br />' collected during the IAS pilot test is summarized on Tables 3, 4, 5, 6 and 7 <br />' 42 RESULTS OF IN-SITU AIR SPARGING PILOT TEST <br /> A plot of IP measurements versus time indicated initial increases after only one to two hours of IAS <br />' operation from observation points MW-1, MW-2, MW-4A and EW-1 (Appendix G), significant <br /> pressure changes were not observed at MW-6 <br /> Advanced GeoEnvironmental,Inc <br /> I <br />