Sparging wells

Sparging depth Feasibility/sparging depth Number of sparging wells Vapor control (venting)... 

In all, 11 vertical soil vapor extraction wells and 9 vertical air sparge wells were installed in the treatment area. Sand chimneys (boreholes filled with coarse sand) were also installed to facilitate vertical air circulation. Mechanical remediation equipment and systems control installed for remediation were mosdy automated with minimal operator control required. 

Each C-Sparger consists of a master unit and one or more in-well assemblies and below-well Spargepoint assemblies. Each master unit can operate up to a total of 6 sparge assemblies. Additional shallow wells are also recommended at 5, 10, and 30 ft from the sparge wells. The prices for each part are shown in Table 2 (D18103D, p. 6). 

Figure 6. SVE/sparge well and conveyance system layout...

Biofllters, Biofilters, also known as biobarriers or microbial fences, are used to hinder migration of a contaminant plume. A biofilter is essentially a zone of biological activity that treats the contaminant as the ground water flows through the area. The biofilter zone can be estabHshed by installing a line of ait sparging wells perpendicular to the direction of ground water flow. 

Johnson et al. (1995) also performed a comparative study to determine how different measurement techniques may offer different values for the radius of influence. A sparge well was screened at 6 ft below ground surface. Direct push methods were used for the monitoring... 

Ardito and Billings (1990) utilized a subsurface volatilization and ventilation system (SVVS), which featured a nested well pair consisting of a sparge well and an extraetion well. Three site applications were reported. At Isleta, New Mexico, a 90% cost reduction per percent benzene reduction was realized. At Bemanillo, New Mexico, between 12,000 and 13,000 gallons were remediated to nondetectable levels. At Arneal, New Mexico, concentrations of 23,000 to 43,000 ppb benzene dropped to 730 to 6,300 ppb after appUcation of SVVS and free-product skimming. 

Leonard and Brown (1992) reported on the use of air sparging applied to a site contaminated with toluene and chlorinated solvents. It was found that 75% of the contaminant resided in the saturated zone. A sparge well was placed at 14.5 ft below ground surface (8.5 ft below the water table). Within three months, 7% of the contaminant was removed. 

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