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r <br /> 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 /> LThe 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 /> Lshown 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 /> i <br /> Depth tohh�iah Ground-- S SCORE S SCORE S SCORE <br /> SITE Water C 10 PTS C 9 PTS C 5 PTS <br /> 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 >1.00 51-100 25-50\1 <br /> Ground Water from the 5 <br /> Soil Sample (-feet) <br /> Fractures in subsurface None Unknown Present <br /> (applies to foothills 10 <br /> or mountain areas) <br /> Average Annual <10 10-25 26--40\2 <br /> Precipitation (inches) 9 <br /> i <br /> L Man-made conduitswhich None Unknown Present <br /> increase vertical 9 <br /> migration- of leachate j <br /> Unique site features: NoneAt -least More <br /> recharge area, coarse 9 one than one <br /> soil, ' nearby wells, etc <br /> COLUMN TOTALS-TOTAL PTS. 10 + 27 + 11 5 1 142 <br /> RANGE OF -TOTAL POINTS 49pts 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 10000 1000 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 /> h <br /> \3 Levels for BTX&E are not applicable at a TPH concentration of 100ppm <br /> -28- <br />