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' 28 April 1995 AGE-NC-95-0103 Page 8 of I I ' 5 1 G ESTIMATED COST OF SOIL VAPOR EXTRACTION ' The costs for vapor extraction systems \aries greatly, depending upon the particular system utilized for destruction of the extracted hydrocarbon vapors (thermal destruction, carbon adsorption, etc ) However, the impacted soil at the site is somewhat laterally limited (see Figure ' 5) and results from the vapor test indicated extracted li}drocarbon concentrations near 3,000 ppmv Therefore, this site should not require a "large-scale" system ' Generally, to operate, maintain, monitor and sample S%,E systems, the cost t}prcally averages between $50,000 to $100,000 per year At many sites, the purchase of a unit is most cost-effective, most units cost bets een S35,000 and S50,000 A lease/rental of a unit generally ' averages between $2,500 to $5,000 per month Maintenance costs for SVE unit depend primarily on the specific unit operated ' 5 2 EX-SITU TREATMENT -ALTERNATIVES IAeration, bioremediation, vapor extraction, and thermal destruction can all be performed on site All four are feasible methods of remediating sandy soil contaminated ti„th gasoline The first three require the construction of a treatment cell thermal destruction does not The dirt area south of the former UST location (\\here %IW--I is located) is oN\ned b\ Properties and is currently vacant, it could be used for treatment Excq\-ited soil could be stockpiled on plastic sheeting dui 11311 the ti eatment per rod Excavated soil could also be disposed of of iec)cled at a licensed facility Off-site disposal x%ould require transport of some of the soil to a Class 11 landfill, because contamination levels exceed the limits of Class III facilities Landfills also require characterization of the contaminants, «rth one sample per 25 cubic yards and anal}sis for metals to addition to TPH and BTE&X 5 2 1 EXCAVATION ' The above-mentioned methods require excavation of the int (3 acted sort which is enei all the P 1 Y fastest and most e$ective method for soil remediation Ho\N ever, the impacted soil extends to depths typically not accessible to conventional excavation equipment Therefore, excavation is not practical at this site In addition, aeration limits set by the San Joaquin Valley Air Quality I Management District, sampling and analysis requirements set by landfills, and the cost of replacing- the eplacingthe disposed soil make ex-situ treatment impractical