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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 Pall 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 /> sum the shown them. ' aMatch the total points of each ito the allowable sBTX&Efor eand TPHach ulevels.and total <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 t E IS MET E IS MET <br /> Minimum depth to >100 51-100 � 25-50\ <br /> Ground Water from the <br /> soil_ sample (feet) <br /> Fractures in subsurface v None <br /> Unknown Present <br /> (applies to foothills <br /> or mountain areas) <br /> Average Annual <10 � 10. 25 26-40\_ZPrecipitation (inches) Lf <br /> Man-made conduits which None Unknown present <br /> increase vertical to <br /> migration of leachate <br /> Unique site features: None Atoleast than <br /> soil, <br /> recharge area, coarse <br /> soil, nearby wells, etc <br /> + <br /> COLUMN TOTALS-TOTAL PTS ZQ + IS 43 <br /> MANGE 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 1000' 100 10 <br /> TPH LEVELS (PPM) <br /> %j If depth is greater than 5 ft. and less than 25 ft., score- o 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 paints. <br /> \s Levels for BTX&E are not applicable at a TPH concentration of lOppm <br /> WiClom J.Hunter&AssOCIOW- LEACHING POTENTIAL ANALYSIS WORKSHEET Table V <br /> 2701 Cottage My.Suite 25 <br /> Sacramento.CA 95825 <br />