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nusi-ox E - <br /> I Table 2--1 _ '= <br /> Leaching Potential Analysis for- Gasoline and Diesel <br /> Using Total. Petroloum, Hydrocarbons(TPH) <br /> Iand Benzene, Toluene, Xylene and Ethylbenzehe (BTX&E) <br /> ieThe following table was designed to permit estimating the <br /> Concentrations of TPH and BTX&E that can be left in place without <br /> I threatening ground water. Three levels of TPH and BTX&E <br /> concentrations were derived (from modeling) for sites which fall into <br /> categories of law, medium or high leaching potential. To use the <br /> I table, firid the appropriate dcccription for 4a,-h of the features. <br /> score each feature USIng r-ne WU1911L.L1iy a� bks t.ep a:e <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 /> SITE C 10 PTS C 9 PTS C 5 PTS <br /> O IF CON- O IF CON- 0 IF CON- <br /> FEATURE R DITION R DITION R DITION <br /> E I5 MET E is MET E IS MET <br /> I Min=um Depth to >100 51-100 25-50\ i <br /> Ground Nater from the ` <br /> Soil sample (feet) <br /> Fractures in subsurface None Unknown Present <br /> (applies to foothills l� <br /> or mountain areas) <br /> Average Annual <10 10-25 26--40 <br /> Precipitation (inches) <br /> Man-made conduits which None Unknavni Present <br /> increase vertical ff, <br /> migration of leachate <br /> Unique site features: None At least More <br /> recharge area, coarse one than one <br /> soil, nearby wells, etc <br /> COLUMN TOTALS-TOTAL PTS + + a <br /> RANGE OF TOTAL POINTS 1149pts or more 41 - 48 pts � 40pts or less <br /> MAXIMUM ALLOWABLE 1/50/50/50 .3/.3/1/1 NA`11 <br /> B/T/X/E LEVELS (PPH) <br /> MAXIMUM GASOLINE 1000 100 10 <br /> ALLOWABLE TPH <br /> LEVELS (PPM) DIESEL 10000 1000 1.00 <br /> I l,I If depth is greater than 5 ft_ and less than 25 ft. , score 0 <br /> points. <br /> If depth is 5 ft. or less, this table should not be used. <br /> \? It precipitation is over 40 inches, score 0 points. <br /> I U Levels for BTX&E are not applicable at a TPH concentration of <br /> 10ppm (gasoline) or 100ppm (diesel) (For explanation see step <br /> 6, page 27. ) <br /> 29 <br /> t <br /> i <br />