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.. <br /> WE ii�3 <br /> Harding Lawson Associates <br /> �..^, tration of surface water from soil to ground water. The asphalt <br /> and concrete also isolate underlying soils from human contact. <br /> -� If hydrocarbons leach into ground water, they would be inter- <br /> cepted by the ground-water remediation system. Given the above <br /> factors, the following set of LUFT cleanup levels for soils are <br /> proposed for this site: <br /> TPH. . . . . . . . . . . . . . . . . . . . . . .1000 ppm <br /> IBenzene. . . . . . . . . . . . . . . . . . . . .1 ppm <br /> CEthylbenzene. . . . . . . . . . . . . . . .50 ppm <br /> Toluene. . . . . . . . . . . . . . . . . . . . .50 ppm <br /> Total Xylenes. . . . . . . . . . . . . . .50 ppm <br /> �r Ground Water - The basin plan for Region 5 designates <br /> all shallow ground water as municipal. Accordingly, we propose- j <br /> that the Drinking water Action Level (DWAL) of the State Depart- <br /> ment of Health Services should be used as the clean-up level. <br /> These levels are: ! <br /> I <br /> Benzene. . . . . . . . . . . . . . . . . . .0.7 ppb <br /> :s . Ethylbenzene. . . . . . . . . . . . . . . .680 ppb <br /> jToluene. . . . . . . . . . . . . . . . . . . . .100 ppb s. .Total Xylenes. . . . . . . . . . . . .620 ppb <br /> 2. Feasibility stu�, <br /> Upon completion of the most recent supplemental inves 4 . <br /> Ligation, !s LA conducted a feasibility study to evaluate remedial <br /> action alternatives for soils and ground water at the Grant Line <br /> Road site. This study is fully described in Appendix G. <br /> {{ � ; The study was broken down into two main sections, tech <br /> nical .evaluation and. cost appraisal. In the first section, the ; <br /> following alternatives were evaluated: <br /> i - <br /> ill, Lj <br /> 16 <br /> R. <br /> x ,. ::.. <br />