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P <br /> 1 <br /> Warding Lawacn Associates <br /> VII. RECOMMENDATIONS <br /> on the basis of our review of all data and the evaluations <br /> z iA performed in the feasibility study, HLA presents the following <br /> recommendations for soil and ground-water remediation. <br /> A. Ground Water <br /> HLA recommends the installation of a series of active hori- <br /> zontal extraction drains for the control and removal of ground <br /> water containing gasoline hydrocarbons. This drain system would <br /> ! be installed near the surface of the water table below the soil- <br /> f: <br /> s ff venting.systen. A surface suction pump will assist in the devel- <br /> opment of a drawdown zone. Both the soil-venting and ground- <br /> {. <br /> water extraction systems would beplaced in .the same trench, The <br /> s development of a drawdown zone would not only assist in capturing I <br /> and removing water in which gasoline hydrocarbons_ are.present, <br /> 6.r but it. would alsfl help prevent ground water from being drawn up � <br /> Li into the soil--venting system during its. operation. Water gener- . <br /> # aced during the operation of the horizontal extraction system <br /> will either be disposed of off-site without any prior treatment <br /> rl � or treated on-site with activated carbon and then discharged into <br /> the storm sewer :system. The choice of.a water treatment`alterna- <br /> s tive will be made during the initial system start-up when the <br /> quantity of water actually generated can be more accurately ' <br /> u y� <br /> determined <br /> 21 <br /> MA <br /> G.v.5- ...' ...'.:- _....�... ..:. <br />