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' 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 desigried 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 ( irroie modeling) for sites which fall into <br /> ' categories of low, mediium of 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- 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) X <br /> Fractures in subsurface None Unknown Present <br /> ' (applies to foothills X <br /> or mountain areas) <br /> ' Average Annual <10 IO-25 25-40\? <br /> Precipitation (inches) q X <br /> Man-made conduits trhich None Unknown Present <br /> increase vertical D X <br /> ; migration of leachate <br />' iUnique site features: None At least More <br /> ( recharge area, coarse 9 one than one <br />' ! soil, nearby wells, etc X <br /> COLUMN TOTALS-TOTAL PTS 201 + ! P + S <br />' RANGE OF TOTAL POINTS 49pts or more 41 - 48 pts 40pts or less <br /> MAXIMUM ALLOWABLE 1/50/50/50 ' . 3/. /1/i NA\3 <br />' B/T/X/E LEVELS (PpM) <br /> MAXIMUM GASOLINE 1000 100 10 <br />' ALLOWABLE TPH <br /> LEVELS (PFM) DIESEL 10000 1000 X '' 100 <br /> \� If depth is greater than 5 ft. and lest than 25 ft. , score 0 <br />' points. <br /> If depth is 5 ft. or, less, this table should not be used. <br /> \� If precipitation is over 40 inches, score 0 points. <br /> \3 Levels far BTX&E are not applicable at a TPH concentration of <br />' 10ppm (gasoline) or 100ppm (diesel.) (For explanation see step <br /> . 5, page 27 . ) <br /> 29 <br /> 1 <br />