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- �_ <br /> _. <br /> mFil <br /> k._ <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 30 PTS C 9 PTS C 5 PTS <br /> O IF CON- 0 IF CON- 0 IF CON- <br /> FEATURE R DITI014 R DITION R DITION <br /> E IS MET E IS MET E IS MET <br /> Minimum Depth to >300 51-300 25-501 <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 /> - Average Annual X10 10-25 I 25-40\2 I <br /> Precipitation (inches) <br /> LX <br /> !!!� <br /> Man-made conduits which I None Unknown Pgesent <br /> increase vertical x <br /> ,w migration of leachate <br /> �301 <br /> Unique site features: None At least <br /> recharge area, coarse LX one t soil, nearby wells, etc J <br /> COLU};N TOTAI.S�TOTAL PTS 9p + J' + D = q9 <br /> - RANGE OF TOTAL POINTS 49pts or more 41 - 4B pts 40pts or less <br /> MAXIMUM ALLOWABLE 1/50/50/5 .3/.3/1/1 NA\3 <br /> B/T/X/E LEVELS (PPM) <br /> P7AXIMUM GASOLINE 1000 100 10 <br /> ALLOWABLE TPH <br /> LEVELS (PPM) DIESEL 10000 1000 100 <br /> \1 If depth is greater than 5 ft. and less than 25 ft. , score <br /> opoints <br /> ----I f-depth-is-5--ft-. or__Iess,_.this- tab]-e-Bhoul_dnot- be-used. <br /> If precipitation is over 40 inches, score 0 points. <br /> t3 Le for B3'XSI are not applicable at a TPH Concentration of <br /> loppm (gasoline) or 100ppm (diesel) <br /> 21 <br /> i <br /> r� <br />