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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 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 column 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 /> 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 3100 51-iQ0 25-50\� <br /> Ground Water from the <br /> Soil Sample (feet) <br /> Fractures in subsurface None Unknown Present <br /> (applies to foothills <br /> or mountain areas) <br /> Average Annual <10 10-25 26-40\12 <br /> Precipitation (inches) <br /> LUnique <br /> dconduits which, None Unknown Present <br /> vertical f(� <br /> n of leachate <br /> ite features: None At least More <br /> area, coarse ! one than one <br /> arby wells, etc ! <br /> TOTALS-TOTALPTS 2[} + 71 5q- <br /> COLUMN + - 43 <br /> RANGE OF TOTAL POINTS 49pts or more 41 - 48 pts 40pts or less <br /> MAXIMUM ALLOWABLE 1/50/50/50 .3/.3/1/1 NA\3 <br /> B/T/X/E LEVELS (PPM) <br /> MAXIMUM ALL 1000 100 10 <br /> TPH LEVELS (PPM) <br /> \, If depth is 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 /> If precipitation is over 40 inches, score 0 points. <br /> \ Levels for BTX&E are not applicable at a TPH concentration of 10ppm <br /> -27- <br />