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Table�2-�1 <br /> Leaching Potential Analysis for Gasoline and-Diesel <br /> Using Total Petroleum-,Hydrocarbons(MP ) <br /> and Benzene, Toluene, Xylene and,Xthylbe_rvzene�(BTX&E) <br /> The following table was designed to permit estimAt#jig the <br /> concentrations of TPH and BTX&E that can be leftwin place without <br /> threatening ground water. Three levels of TPH and BTX&E <br /> concentrations were derived (from modeling) for sites which fall into <br /> categories of low, medium or high leaching potential. To use the <br /> table, find the appropriate description for 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. Mated - <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 /> i O IF CON- 0 IF CON- 0 IF CON- <br /> FEATURE R DITION R DITION R DITION <br /> E IS MET E IS MET E IS MET <br /> Minimum Depth to >100 51-100 0 25-50\J- <br /> ' Ground Water from the <br /> Soil Sample (feet) <br /> 3 <br /> Fractures in subsurface None Unknown Present <br /> (applies to foothills 10 <br /> F <br /> or mountain areas) <br /> Average Annual <10 10-25 26-40\? <br /> Precipitation (inches) 10 <br /> Man-made conduits which None Unknown Present <br /> increase vertical 10 <br /> migration of leachate <br /> Unique site features: None At least More <br /> recharge area, coarse 10 one than one <br /> soil, nearby wells, etc <br /> COLUMN TOTALS-TOTAL PTS 4G + + = 1E] <br /> RANGE OF TOTAL POINTS 49pts or more 41 - 48 pts Opts of less <br /> MAXIMUM ALLOWABLE 1/50/50/50 .3/.3/1/1 NA\3, <br /> B/T/X/E LEVELS (PPM) <br /> MAXIMUM GASOLINE 1000 100 10 <br /> ALLOWABLE TPH <br /> LEVELS (PPM) DIESEL 10000 1. -j <br /> 1000 100 <br /> \, If depth is greater than 5 ft. and less than 25 ft. , score <br /> Opoints. <br /> If depth is 5 ft. or less, this table should not be used. <br /> If precipitation is over 40 inches, score 0 points. <br /> AM, Levels for BTX&E are not applicable at a TPH concentration of <br /> 10ppm (gasoline) or 100ppm (diesel) <br /> i <br /> i <br /> 21 <br />