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4 <br /> TABLE 2-2 <br />' GENERAL RISK APPRAISAL <br /> FOR PROTECTION OF WATER QUALITY: YES NO <br /> APPLICABILITY CHECKLIST <br /> 1. Is the site <br /> areas withtro�ky subsurfaceaded moist <br /> conditi.ons) <br /> areas &/or <br /> 2 . Is the site in an area that could collect surface <br /> runoff or intercept water from a source other than �( <br /> the natural precipitation? ' <br />' 3 . Does the areal extent of soil contamination <br /> exceed 1000 feet"? <br /> 4 . Do the concentrations of fuel constituents in any <br /> soil samples exceed the following amounts: <br /> benzene - 100 ppm, toluene - 80 ppm, xylene - 40 �( <br />' ppm, ethylbenzene - 40 ppm? <br /> 5 . Are there any records or evidence of man-made or ` <br /> natural ob3ects which could provide a conduit for x <br />' vertical migration of leachate? <br /> 6. Do any boring or excavation logs show the presence <br /> of fractures, 3oints or faults that could act as a <br /> conduit for vertical migration of leachate? <br /> 7 . Do any boring logs show that contaminated soil X <br /> could be within 5 ft. of highest ground water? <br /> 8 . Do any boring logs show the presence of a layer of ` <br /> material, 5 ft. thick or more, which is more than �( <br /> 75$ sand and/or gravel? <br /> ' Directions: <br /> 1. Boring 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 on the checklist cannot be answered <br /> nno" , then the results of the general risk <br /> appraisal may be less valid. <br /> 38 <br />