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TABLE 2-2 <br /> I <br /> I Gr.N=AL RISc� APPRAISAL <br /> FOR PRCTECTION OF WATER QGA=TY: <br /> APPLICABILITY CHECKI&IST YES No � <br /> j <br /> 1. Is the site in a mountainous area' (shaded moil <br /> areas &/or areas with rocky subsurface cnnditions) <br /> 2 Is Zhe site 14-1 an area that could collect surface <br /> rancf, or -ntarcept water from a source other than <br /> the natural precipitation? <br />' 2 . Does the areal extent of sail contaminatz on <br /> exceed 1000 feet-_ ? + <br /> 4 . Do the cnncentz-ataons of fuel constituents .n any <br /> soil samples exceed the following amounts: <br /> benzene - 100 apm, toluene - 80 ppm, xylene - 40 x <br /> ! ppm, ethyl-benzene - 40 num? <br /> 5 . A.,-.a there any records or evidence of man--made or <br /> natural cm3ects which could provide a conduit for <br /> vez-tical m_grauon of -leachate? <br /> 5. Do any boring or excavation logs show the presence <br />' of fractures, 70_qts or Faults that could act as a i <br /> cnnduz.t for vertical magrataon of leachata? <br /> 7 Da a_nv baring logs show that contaminated soil <br /> could- be with=n 5 ft. of highest ground water? <br /> 8 . Do any borl..ng 1 cgs show the presence of a layer <br />' material, 5 ft. thick or more, which is more than X <br /> 75$ sand and/or gravel? <br /> Directions: <br /> 1. Baring logs taken during the general risk <br /> appraisal can be used to answer questions 5--8 . In <br /> addition, analytical results of the soil samples <br />' taken during the general risk appraisal can be <br /> used to answer questions 3 and 4. <br /> 2. Lateral migration of constituents to problem areas <br />' should also be considered in questions 5-8 . <br /> 3 . The above checklist contains questions which are <br /> designed to identify sites with environmental <br />' conditions which could produce a greater risk to <br /> ground water than was modeled. The results of the <br /> general risk appraisal are most applicable if all <br /> of the questions on the checklist can be answered <br />' "no" with reasonable certainty. If any of the <br /> questions an the checklist cannot be answered <br /> ;no" , then the results of the general risk <br />' appraisal may be less valid. <br /> 38 <br />