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Table 2-1 <br /> - &Gachinv potential Analysis for Gasoline <br /> 4 VOL" TOUT 7etT*1C= Hydrocarbons(TPH) <br /> and Henseno, Toluene, Xylene and Xthylbenzene (BTX&E) <br /> The following table was designed to permit estimating the concentration <br /> of TPH aryl STX&X that can be left in place without threatening ground <br /> grater. 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 rase the table, fi;d 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 /> thee. Xatch the total points to the allowable 9TX4E and TPH levels. <br /> S SCORE 8 SCORE 8 SCORE <br /> SITE C IO PTS C 9 PTS C 5 PTS <br /> O IF CON- O IF CON- 4 IF CON- <br /> FEATURE R DITION R DITION R DITION <br /> E IS MET E IS MET E IS MET <br /> Minimum Depth to >100 51-100 25-50\1 <br /> Ground Water from the q <br /> soil Sample (feet) r <br /> Fractures in subsurface None Unknown Present <br /> (applies to foothills la <br /> Aw- <br /> or uountain areas) <br /> Average Annual <10 10-25 25-44 <br /> Precipitation (inches) q <br /> Man-made conduits which ' None 'Unknownj, Present # <br /> increase vertical '0 <br /> migration <br /> of leachate F <br /> Unique site features: None I; i At Yeast ' f More <br /> recharge area, coarses jo one 'than one <br /> ,soil, nearby wells, etc f <br /> COL[]1�IId <br /> TOTALS-TOTAL PTS 70 + e � <br /> RANGE OF TOTAL POINTS 49pts or more 41 - 48 pts 40pts or Tess <br /> MAXIM M ALLOWABLE 1/50/50/50 .3/.3/1/1 i NAS <br /> k B/T/X/E LEVELS (PPM) <br /> MAXIMUM ALLOWABLE 1000 104 ! 10 <br /> I TPH LEVELS (PPM) ! <br /> It eepth is greater than 5 ft. and less than 25 ft. , score 0 points. <br /> If d@pth is 5 ft. or less, this table should not be used. . <br /> If precip-Cation is over 40 inches, score 0 points. <br /> Levels for BTX&E are not applicable at a TPH concentra_-on of 10ppm <br />