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,......., •r.. hvr'wc K3..w- L^`x rw0r .+�ltl„1t�w' <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- 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 25 <br /> Ground Water from the <br /> Soil Sample ( feet) <br />' Fractures in subsurface None Unknown Present <br /> (applies to foothills <br /> or mountain areas) <br /> 1 <br /> Average Annual <10 10-25 26-40\ <br /> Precipitation (inches) W11 <br /> Man-made conduits which None Unknown Present <br /> increase vertical iX <br />' migration of leachate � \ <br />' Unique site features : X <br /> None At least More <br /> recharge area, coarse one than one <br /> soil , nearby wells, etc <br />' COLUMN TOTALS-TOTAL PTS ZO {- E + L�� yl <br /> RANGE OF TOTAL POINTS 49pts or more 41 -- 48 pts 40pts or less <br /> . 3/1/1 NA\3 <br /> 1/50/50/50 . 3 <br /> MAXIMUM ALLOWABLE / <br /> B/T/X/E LEVELS (PPM) <br /> MAXIMUM GASOLINE 1000 100 10 <br /> ALLOWABLE TPH <br /> LEVELS (PPM) DIESEL 10000 1000 100 <br /> W-1 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 /> \2 If precipitation is over 40 inches , score 0 points . <br /> 1 \3_ Levels for BTX&E are not applicable at a TPH concentration of <br /> lOppm (gasoline) or 100ppm (diesel) <br /> 21 - <br />