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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 concentraLicns <br /> of TPH and BTX&E that can be left an place without threatening crcura <br /> -,rater. Three levels of TPH and BTX&E concentrations were der_vea ( fra- <br /> :modeling) for sites which fall into catagories of low, medium or ^_cn <br />' leaching potential . To use the table, find the appropriate descripL.,on <br /> for each of the features . Score each feature using the weignting sysze^ <br /> shown at the top of each column. Sum the points for each column and tczal <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 /> I FEATURE R DITION R DITION R DITION <br /> E IS MET E E IS MET j E IS :SET <br /> Minimum Depth to >100 53-100 5 125-50\1 <br /> Ground Water from the i <br />' Soil Sample ( feet) <br /> ! Fractures in subsurface 10 None Unknown Present <br /> (applies to foothills <br /> or :mountain areas) I <br />' average Annual I <109 10-25 26-40\2 i <br /> Precipitation ( inches) <br /> ' elan-made conduits which) None I Unknownf5 Present <br /> increase vertical w <br /> :migration of leachate <br /> Unique site features : I None At least 5 More <br /> recharge area, coarse one than one <br /> soil , nearby wells , etc) <br /> COLUT'N TOTALS-TOTAL PTSI1• + 9 15 I = i34 <br /> ' RANGE OF TOTAL POINTS 149pts or more 41 - 48 pts 140pts or less ) <br /> ?MAXIMUM ALLOWABLE 1/50/50/50 . 3/ . 3/1/1 NA\3 i <br /> ' B/T/X/E LEVELS (PPM) <br /> 1 MAXI?MLTM ALLOWABLE i 1000 100 10 <br /> ITDH LEVELS (PPM) <br /> If depth is greater than 5 ft. and less than 25 ft . , score 0 cc_nZs <br /> If depth is 5 ft . ;r less , this table should not be used. <br /> 2 If precipitation i over 40 inches , score 0 points . <br /> Levels for BTX&E are not applicable at a TPH concentration cf IJ��- <br />