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Table 2-2 <br /> Leaching Potential Analysis for 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 concentrations <br /> of TPH and BTX&E that can be left in place without threatening ground <br /> water. Three levels of TPH and BTX&E concentrations were derived ( from <br /> modeling) for sites which fall into catagories of low, medium or high <br /> leaching potential . To use the table, find the appropriate description <br /> for each of the features. Score each feature using the weighting system <br /> - shown at the top of each column. Sum the points for each column and total <br /> them. Match 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 C� <br /> or mountain areas) I <br /> Average Annual <10 10-25 26-40\2 <br /> Precipitation (inches) <br /> 1�1 <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, etc <br /> 1 71 COLUMN TOTALS-TOTAL PTS O 1 + _ jjq11 <br /> RANGE OF TOTAL POINTS 49 is or more 41 - 48 pts 40pts or less <br /> MAXIMUM ALLOWABLE 1/50/50/50 . . 3/ . 3/1/1 NA\3 <br /> B/T/X/E LEVELS (PPM) <br /> MAXIMUM ALLOWABLE 100001000 100 <br /> TPH LEVELS (PPM) <br /> \1 If depth is greater than 5 ft. but less than 25 ft. , score 0 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 /> \3 Levels for BTX&E are not applicable at a TPH concentration of 100ppm <br /> r <br /> -28- <br />