Laserfiche WebLink
�• AMERICAN <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 /> Scone 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 />• <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 TS MET E IS MET E IS MET <br />• Minimum Depth to >200 9 51--100 25-50\1 <br /> Ground Water from the <br /> Soil Sample (feet) <br /> Fractures in subsurface 10 None Unknown Present <br /> (applies to foothills <br /> • or mountain areas) <br /> Average Annual <10 9 1.0-25 26-40\_2 <br /> Precipitation (inches) <br /> Man-made conduits which 10 None Unknown Present <br /> increase vertical <br /> migration of leachate <br /> Unique site features: � None �� At least 5 More <br /> rechar arse one than one <br /> sol nearby wel s etc <br /> COLUMN TOTAIS-«TOTAL PTS 2O + 18 1 + IL 5 = 43 <br /> —J <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\3 <br /> B/T/X/E LEVELS (PPM) <br /> MAXIMUM GASOLINE 1000 100 10 <br /> ALLOWABLE TPH <br /> LEVELS (PPM) DIESEL 10000 1000 I 100 <br /> U If depth is greater than 5 ft. and less than 25 ft score <br /> Opoints. <br /> If deptn is 5 ft. or less, this table should not be used. <br /> \? If precipitation is over 40 inches, score 0 points. <br /> Levels for BTX&E are not applicable at a TPH concentration of <br /> 70ppm (gasoline) or 100ppm (diesel) <br />