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M <br /> s r, <br /> i <br /> Harding Lawson Associates <br /> estimate for this alternative is between $60,000 and $90,000. <br /> This estimate does not include potential long-term maintenance <br /> } costs. <br /> C. Recommendations <br /> Table A summarizes the alternatives evaluated in this study. <br /> 1. Ground Water <br /> HLA recommends installing a series of. active horizontal <br /> extraction drains to control and remove ground water containing <br /> i <br /> (7 gasoline hydrocarbons at the site. This well system would be <br /> b _ <br /> installed near the surface of the water table, and would include ? <br /> S .fi a surface. suction pump to assist in the development of a drawdown <br /> s zone. Such a zone would help capture and remove water containing <br /> gasoline hydrocarbons. Water generated during the operation of. <br /> L -A the 'extraction. system would be disposed of off site, without <br /> prior treatment, or treated on site with activated carbon and <br /> then discharged into the storm sewer. The choice of a water <br /> treatment. alternative will be made during system start-up when <br /> `T <br /> ...the quantity of water. actually:generated can be more precisely . t <br /> determined. Ground-water monitoring via existing wells down-. <br /> is gradient .of the extraction system should ,be. continued. <br /> 2 sa�]- <br /> } -venting be: ursued initially for recommend that sal <br /> n <br /> { <br /> - <br /> soil remediation. This alternative will allow for the maximum f <br /> recovery of hydrocarbon constituents -in the .vadose zone,` while <br /> causing a minimum of physical disturbance to the site and its <br /> 25 <br /> Y <br />