Laserfiche WebLink
Table 2-1 <br /> Leaching Futential Analy O s for Gasoline and Diesel <br /> Using 'Total Petroleum }fydrocarbons(TPtl) <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 /> Scare 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 /> S SCORE S SCORE S SCORE <br /> SITE C 10 PTS C 9 PTS C 5 PTS <br /> 0 IF CON- O IF CON- 0 IF CON- <br /> FEATURE R DITION R DITION R DITION <br /> E IS MET E IS MET E 11S MET <br /> Minimum Depth to >100 51-100 25-50\1 <br /> Ground Water from the .� <br /> SLI Sample (feet) <br /> Fractures in subsurface None Unknown Present <br /> (applies to foothills <br /> or mountain areas) <br /> Average Annual <10 63 10-25 26-40\2 <br /> Precipitation (inches) i <br /> Man-made conduits whichNone Unknown Present <br /> increase vertical L� <br /> migration of leachate <br /> Unique site features: None At least Mure <br /> recharge area, coarse one 5 than one <br /> soil, nearby wells, etc <br /> COLUMN TOTALS-TOTAL PTS O { �� 3 y <br /> FB/T/X/E <br /> OTAL POINTS 49pts or more 41 - 43 pts 40pts or less <br /> LOWABLE 1/50/50/50 .3/.3/1/1 NA\ <br /> VELS (PPM)GASOLINElOD l0 <br /> TPH <br /> LEVELS (PPM) DIESEL 10000 1000 100 <br /> \1 If depth is greater than 5 ft. and less than 25 ft. , score 0 <br /> ----- - .._. ... .-...... -- <br /> 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 <br /> loppm (gasoline) or 100ppm (diesel) (For explanation see step <br /> 6, page 27.) <br /> 29 <br />