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Tablet <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 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 appropriate description <br /> for each of the features. Score each feature using the weighting system <br /> shown at the top of each column. sum the points for each c:oZumn and total <br /> them. Match 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 /> 0 IF CON- 0 IF CON_ Q IF CON- <br /> i FEATURE R DITION R DITION R DITION <br /> 1 .W E IS MET E IS MET E IS MET <br /> LL M__i__n__irrmum Depth to >100 51-]OG, 25-50\1 <br /> Greund Water from the , <br /> Soil Sample (feet) <br /> �- Fractures .in subsurface None Unknown Present <br /> 1 (applies tv foothills 10 <br /> or mountain areas) <br /> Average Annual <14 10-25 26-40\Z <br /> Precipitation (inches). <br /> f Man-made conduits which (done Unknown Present <br /> increase vertical 10 <br /> j migration of leachate <br /> Unique site features: None . At least More <br /> recharge area, coarse C] one than one <br /> { soil; nearby wells, etc [ <br /> COLUDW TOTALS-TOTAL PTS + f g + S z 43 <br /> j RANGE OF TOTAL POINTS 49pts or more 41 -- 48 pts 4Opts or less <br /> MAXIMUM ALLOWABLE 1/50/50/50 .3/.3/1,/1 NAS <br /> B/T/X/F, LEVELS (PPM) <br /> MAXIMUM ALLOWABLE 1000 100 10 <br /> TPH LEVELS (PPM) <br /> ^; If depth is greater than 5 ft. and less than .5 ft., score 0 points. <br /> If depth. is 5: ft. or less, this table should ni:t be used. <br /> Ig-,precipitation is over 40 inches, score 0 points. <br /> Levels for for BTX&E are not applicable at a TPH concentration of 10ppm <br /> p.. <br />