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TABLE 2-3 <br /> GENERAL RISK APPRAISAL <br /> FOR PROTECTION CF WATER QUALITY: <br /> APPLICABILITY CHECKLIST YES NO <br /> 1. is the site in a mountainous area? (shaded moist <br /> tel <br /> areas &/or areas with rocky subsurface conditions) <br /> 2. Is the site in an area that could collect surface <br /> runoff or intercept water from a source other than el <br /> the natural precipitation? <br /> 3. Does the areal extent of soil contamination <br /> exceed 100 meters'? <br /> 4. Do the concentrations of fuel constituents in any <br /> soil samples exceed the following amounts; <br /> ene - 40 <br /> benzene - 100 ppm, toluene - 80 ppm, xylene <br /> ppm, ethylbenzene - 40 ppm. <br /> 5. Are there any records or evidence of man-made or / <br /> natural objects which could provide a conduit for y <br /> vertical migration of leachate? <br /> 6. Do any boring or excavation logs show the presence <br /> of fractures, joints .or faults that could act as a <br /> conduit for vertical migration of leachate? <br /> 7. Do any boring logs show that contaminated soil <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 appraisal <br /> can be used to answer questions 5-8. in addition, <br /> analytical results of the soil samples' taken during <br /> the general risk appraisal can be used to answer <br /> 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 /> around water than was modeled. The results of the <br /> general riskappraisalare 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 "no" , <br /> then the results of the general risk appraisal may <br /> be less valid. <br /> Milam J.Hunter&Assoclates <br /> 2707 Cottage Vt4y,Sulte 25 GENERAL RISK APPRAISAL WORK SHEET Table IV <br /> Sacramento,CA 95825 <br />