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Table 2-1 j <br /> Leachir, Iotential Analysis for Gast r�e add Diesel' <br /> Us17ng Total Petroleum Hydrocarbo s(TPH) <br /> and Benzene, Toluene, Xylene and Ethylbenzene (BTX&E) <br /> The following table was designed to <br /> g permit est:a.mating the <br /> concentrations of TPH and BTX&E that can b'e left in place without <br /> threatening ground water. Three levels of. TPH and BTX&E <br /> concentrations were derived (from modeling;) for sites which fall,. int <br /> categories of low, medium or high leach i.ng� potential. To use the <br /> table, find the appropriate description fo'r each of the features. <br /> Score each feature using the weighting system shown at the top of <br /> each column. Sum the points for each column and total them. Match <br /> the total points to the allowable BTX&E and TPH levels. <br /> S SCORE S SCORE S SCORE - , <br /> i SITE C 10 PTS C 9 , PTS C 5 PTS <br /> 0 IF CON- O IF CON- O IF CON- <br /> FEATURE R DITION Rt DITION R DITION <br /> E IS MET E; IS MET E IS MET <br /> Minimum Depth to > } <br /> 1� loo '��, 51-100 25-50\1 <br /> Ground Water from the <br /> Soil Sample (feet) <br /> ;r <br /> l Fractures in subsurface None i Unknown Present <br /> (applies to foothills <br /> or mountain areas) j <br /> Average Annual X10 10-25 26-40\2 <br /> Precipitation (inches) ; <br /> Man-made conduits which None Unknown Present <br /> increase vertical <br /> migration of leachate <br /> IIS <br /> Unique site features: None At least More <br /> recharge area, coarse :r� s 'one than one <br /> soil, nearby wells, etc i <br /> COLUMN TOTALS-+TOTA�LPT S J + 3f <br /> i <br /> RANGE OF TOTAL POINTS 49pts or more 41 - 48 pts 40pts"-or less ' <br /> MAXIMUM ALLOWABLE.' 1/50/50/50 . 13/. 3/1/1 :_NA\3 � <br /> B/T/X/E LEVELS (PPM) <br /> MAXIMUM GASOLINE 1000 { 100 <br /> 10 <br /> ALLOWABLE TPH <br /> LEVELS (PPM) DIESEL 10000 ; 1000 100 i <br /> \1 If depth is greater than 5 ft. and 1 s-sjthan 25 ft. , score 0 <br /> points. <br /> If depth is 5 ft. or less, this table should not"be used. <br /> \2 If precipitation is over 40 'inches, score 0 points. - <br /> Levels for BTX&E are not applicableat a TPH concent`ration of <br /> 10ppm (gasoline) 'or 100ppm (diesel) -! (For', explanation see step <br /> 15, ,1page 27. ) <br /> K-1 K3 <br /> L Z 7��v <br />