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FIGURE 3 <br /> ,a <br /> Source: LUFT Manual March 1989 <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 permit estimating the concentrations <br /> of TPH and BTX&E that car, 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 'usre the table, find the appropriate description <br /> for each of the features. Score each feature using the weighting system <br /> s shown 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 /> S SCORE S SCORE S SCORE <br /> SITE C ?0 PTS C 9 PTS C 5 PTS F <br /> O IF CON- 0 IF CON- Q IF CON- <br /> FEATURE R DITION R DITION R DITION <br /> E IS MET E IS INET E IS MET <br /> Minimum Depth to :100 51-100 25-50\Z <br /> Ground Water from the /0 i = <br /> Soil Sample (feet) <br /> Fractures in subsurface None Unknown <br /> (applies to foothills /0 Present <br /> or mountain areas) <br /> L <br /> Average Annual <10 ' <br /> 10--25 26-40\2 F' <br /> Precipitation (inches) 9 <br /> ,t <br /> 9i <br /> Man-made conduits which <br /> None Unknown Present <br /> increase vertical 10 <br /> migration of leachate <br /> 'to features: /Q None At least <br /> t,x a a.::. -__` More <br /> �,� coarse one than one <br /> iw+ soil, near y wells, etc <br /> s COLUMN TOTALS-TOTAL PTS + + <br /> ` EYE <br /> RANGE OF TOTAL POINTS 49pts or��re 41 4y <br /> p 40nts or less <br /> MAXIMUM ALLOWABLE1/50/50/51 <br /> ,0 3 3 Z 1 �' <br /> es B/T/X/E LEVELS (PP /•. ./ / \` NA\3 1 <br /> i <br /> MAXIMUM ALLOWABLE 1\1 1000 100 10 t <br /> TPH_LEVELS---(PPM)----- -- ----- -- - ---- --- - <br /> \16 Ef. de th is <br /> p greater than 5 ft. and 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 /> \3 Levels for BTX&E are not applicable at a TPH concentration of loppm <br /> 1 <br /> ; <br /> t <br /> �d <br />