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r' <br /> �a <br /> Y��LCY./ `. . <br /> toc_r�fcn C.�I� f,+rr�ia <br /> 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 TPM 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 int:, 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 -,ORE S SCORE S SCORE W � <br /> SITE C 10 PTS C 9 PTS C S P'L's ° <br /> 0 IF CON- 0 IF' CON- 0 IF CON- , <br /> _ FEATURE R DITION I R DITION R DITION <br /> E IS MET E IS MET £ IS Z-ET <br /> Minimum Depth to >100 51-100 25-50\1 <br /> Gro+md Water from the <br /> Soil Sample (rest) V <br /> Fractures in subsurface *tone Unknown Present <br /> (applies to foothills /D <br /> or mountain areas) <br /> s Average Annual <10 10-25 26-40\,Z r <br /> Precipitation (inches) <br /> f <br /> Man-made conduits which None Unknown Present <br /> increase vertical I� <br /> migration of leachate <br /> �. Unique site features: None At least More <br /> recharge area, coarse /G one than one <br /> soil, nearby wells, etc ' <br /> COLUMN TOTALS-TOTAL PTS PO + + +� <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\ <br /> B/T/X/E LEVELS (PPM) <br />----------.._ - MAXIMUM--ALLOWABE - .1000. _._...._..100.._ _.._.. 10 ......... ..._....� <br /> TPH LEVELS (PPM) <br /> %'- `1 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 ever 40 inches, score 0 points,. <br /> Levels for BTX&E are not applicable at a TPH concentration of l0ppm <br /> { <br /> -27- <br />