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f• ----- '--- - ( � :. ri'-.BLE -2^2 <br /> GENERAL RISK APPRAISAL <br /> FOR PROTECTION OF WATER 'QUALiTY" <br /> APPLICABILITY CHECKLIST YES NO <br /> ' 1 . 1 Is the site in a, mountainous area? (shA,ded moist <br /> ;; areas &/or areas:, with rocky .subsurfaceiconditions) <br /> 2 . Is the site in an area thAtt. could collectsurface <br /> runoff or intercept water ' f.rom a source., other than,. .. <br />�I <br /> ; the natural precipitation? _ ff �ct. II <br /> • - CO �'Trvv�[vta.I7d� <br /> 3. :} Does the areal extent of:..soil contamination t� so� l .S&6-L fes <br /> j exceed 1000 feet? <br /> 4 . Do the concentrations of fuel constituents in any . <br /> soil samples exceed •.the following amouri_..s: <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 objects which could provide a 6onduit. for <br /> j vertical migration of leachate? <br /> 6. ; Do any boring or excavation logs show the `pr_esence <br /> of fractures, joints or faults .that cotl.d act as a 3a� <br /> conduit for vertical migration of leachate? <br /> 7 Do any boring logs show that. contaminated- soil <br /> Ji could be within ;5 ft. of highest .ground water?. <br /> 8 iDo any boring logs show the presence of a_ layer of <br /> material , 5 ft. 'thick or more, which is" more than x- <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 ana 4 . <br /> 2 . Lateral migration of constituents to problem areas_ <br /> should .alsb be considered in questions 5-8..' <br /> 1 3 . The above checklist contains questions which are. .. <br /> 1 designed to . identify sites wi.�jh environmental <br /> conditions which could produce a greater risk to <br /> ground 'water "khanwas modeled. The results of. the <br /> general. risk appraisal are -most applicable if all <br /> of the °questions on- the checkiist can be answered <br /> "no" with reasonable certainty, if any of the <br /> questions on the checklist cah-hot 'be .answere-d <br /> "no" , then the results .of th6$ ge.neral risk <br /> appraisal may be less valid. <br />