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KINETIC y V V the test spargewell (TW)to be able to m%e a 3-dimensional picture of the test results The larger diameter(2-inch ID) wells allowed ground%+ater flow as well as pressure change to be monitored during treatment A Nanety of physical and chemical measurements were performed during the test(Table 1) Table I. Ground Aater Monitoring during Pilot Test. Temperature,turbidity, pH,Fe;redox potential, dissolved oxygen (DO), static ttiater elevation, HVOCs including PCE,TCE,DCE, VC,TCA, groundwater flow, DCA; VOCs including benzene,toluene, • - _ -head pressure change ethylbenzerie,xylenes,ozone concentration C-SPARGE WELL WSTALLATION e 3 was installed The C-Spargenm double-screen well with lower SpargepomtR (Figur ) N%ith a recirculating water system and casing. A small flow (2 galtmin) was obtained from a shallow fire well for makeup water. Tlie lower Spargepoint R was set at a depth of 2 6 in (8.5 ft) A one-half inch tubing extended to the surface from a compression fitting on the Spargepoint R A 4-inch •'"' o ID triple-screened well extended from 23 m(75.5 ft) .ouffse,o a M` to .3 m (1 ft)above grade. The 2 m(6.6 R)long .9-26 screens were placed with bottom edges at 23 in (75 5 ft), 13 in (42.7 ft),and 2 5 m(8.2 ft). The middle casing between the two lower screens received 1 in(3 ft)of bentonite grout, I m(3 ft)of cement/bentomte, and .10 1 in (3 ft) of bentonite, in that order,to seal the annular w8fters"04 M space to prevent"short-circuiting" of waxer. Water and '=° fine bubbles are injected into the formation from the is D lowest screen and retum water enters the middle screen. T ,s 0 The uppermost screen collects gases from just above the water(2.5 m [8 2 ftl)to assure vapor control. RADIUS OF INFLUENCE r° The C-Sparge'm system is designed to achieve ••o s �D 235 the injection and distribution of microbubbles into the WOMM aquifer to be treated. The pressure of the gas injection, s X35 ==0 use of microporous bubblers, and a recirculating well ."4W� ° :65 system all function to distribute fine bubbles,containing rM weii installation airlozone gas,through the fine sands under Darcian flow Figure C-Sparge approximating fluid flow The injection of the airiozone (TW), depth in meters approximates the injection of water, exhibiting mounding and outward mox ement until equihbirum is reached Despite numerous monitoring well corings depicting uniform fine sand formation ��-ith occasional graNel deposits,the immediate injection pressures and distribution suggested 4