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Table 2-2 <br /> Leaching Potential Analysis for 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 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 /> Am ALF A 2.0' -50n_ OQleje, "F <br /> A'ZO :3v S SCORE S SCORE S SCORE <br /> SITE C 10 PTS C 9 PTS C 5 PTS <br /> 0 IF CON-- 0 IF CON- 0 IF CON- <br /> FEATURE R DITION R DITION R DITION <br /> Com' r 16 3 E IS MET E IS MET E IS MET <br /> Minimum Depth to >100 51-100 25- 0`l <br /> Ground Water from the 5 <br /> Soil Sample (feet) <br /> a <br /> Fractures in subsurface None Unknown Present <br /> (applies to foothills +Q <br /> or mountain areas) <br /> . Average Annual [10 10-25 26-40\2 <br /> Precipitation (inches) 9 <br /> il I <br /> Man-made conduits which done Unknown Present <br /> increase vertical 10 <br /> 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 /> COLUMN TOTALS-TOTAL PTS ZQ + 18 + s 43 3 f <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 ALLOWABLE 10000 1000 100 <br /> TPH LEVELS (PPM) <br /> \-I If depth is greater than 5 ft. but less than 25 ft. , score 0 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 /> Levels for BTX&E are not applicable at a TPH concentration of 100ppm <br /> -28- <br /> WM.J. HUNTER&ASSOC. LEACHING POTENTIAL ANALYSIS WORKSHEET <br /> 2220 LOMA VISTA DR. PLATE XVI <br /> SACRAMENTO,CA 95825 <br />