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i <br /> Table 2-1 <br /> Leaching Potential Analysis for Gasoline and Diesel <br /> Using Total Petroleum Hydrocarbons (TPH) <br /> and Benzene, Toluene, Xylene and Ethylbenzene (BTX&E) <br /> The following table was designed to permit estimating the <br /> concentrations of TPH and BTX&E that can be 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 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. 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- O 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 25-50\1 <br /> Ground Water from the <br /> Soil Sample (feet) <br /> Fractures in subsurface None Unknown Present <br /> (applies to foothills r <br /> or mountain areas) <br /> Average Annual c10 10-25 26-40\2 IV <br /> Precipitation (inches) 9 <br /> Man-made conduits which None Unknown Present <br /> increase vertical <br /> migration of leachate <br /> Unique site features: None At least More <br /> recharge area, coarse one than one <br /> soil, nearby wells, et 7 <br /> COLUMN TOTALS-TOTAL PTS <br /> RANGE OF TOTAL POINTS 4.6pts or mbr e 41 't:�48 pts 40 is or less <br /> MAXIMUM ALLOWABLE I/50/50/50 .3/.3/1/1 NA\3 <br /> B/T/X/E LEVELS (PPM) . <br /> i <br /> MAXIMUM GASOLINE 1000 100 10 <br /> ALLOWABLE TPH <br /> LEVELS (PPM) DIESEL 10000 1000 f ! 100 <br /> If depth is greater. than'-5---ft-- and less than 2 ft. , sc. 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 applicable at a TPH concentration of <br /> 10ppm (gasoline) or 100ppm (diesel) (For explanation see step <br /> 6, page 27. ) <br /> 29 <br />