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7- <br /> Table 2-1 <br /> Leaching Potential Analysis for Gasoline <br /> Using Total Petroleum Hydrocarbons(TPH) <br /> and Benzene, Toluene, Xylene and Ethylbenzene (BTX&E) <br /> The following table was designed to I� <br /> 9 permit estimating the concentrations r <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 a ra riate description <br /> for each of the features. Score each feature using:the weighting system <br /> shown at the top of each column. Sum the pointsllfor each column and total <br /> them. Match the total points to the allowable BTX&E °and TPH levels. <br /> II i <br /> S SCORE S 7DITI.bN <br /> E $ SCORE <br /> SITE C 10 PTS C S C 5 PTS <br /> 0 IF CON- 0 ON- O IF CON- <br /> FEATURE R DITION R R DITION <br /> E IS MET E ET E IS MET <br /> Minimum Depth to >100 51-100 25-50\"., <br /> Ground Water from the <br /> Soil Sample (feet) <br /> i <br /> Fractures in subsurface None Unknown 1 Present <br /> (applies to foothills I <br /> or mountain areas) <br /> r <br /> Average Annual <10 10-25 <br /> Precipitation (inches} } 26-40 ? <br /> q !, r <br /> 1 <br /> Man-made conduits which <br /> None <br /> Unknown Present <br /> e <br /> r <br /> inc ase vertical <br /> I <br /> migration of leachate <br /> D <br /> Unique site features: None At least: More <br /> recharge area, coarse one than <br /> soil, nearby wells, etc one <br /> COLUMN TOTALS-TOTAL PTS 20 + <br /> RANGE OF TOTAL POINTS 49pts or more 41 - 48 pts 140pts or less <br /> MAXIMUM ALLOWABLE 1/50/50/50 .3/.3/1/1 - NA\2 <br /> B/T/X/E LEVELS (FPM) 1 <br /> MAXIMUM ALLOWABLE1000 100 10 <br /> TPH LEVELS (PPM) ' Ir <br /> E. \-I If depth is greater than 5 ft. and less thana25 ft. , score 0 points. <br /> If depth is 5 ft. or less, this table should not be used. <br /> U If precipitation is over 40 inches, score 0 points. <br /> \2 Levels for BTX&E are not applicable at a TPH{conc'entration of ioppm j <br /> -27- <br /> f 5 <br /> l <br /> f ' <br />