Laserfiche WebLink
SII <br /> 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 fallowing 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, findthea <br /> tion <br /> for each of the features. Score each feature using theriate weighting rsystem <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 /> S SCORE S SCORE. S SCORE <br /> SITE C 10 PTS C <br /> 9 PTS' C 5 i`TS <br /> 0 IF CON- O IF CON- O IF CON- <br /> FEATURE R DITION R DITION R DITION <br /> E 7Ncne <br /> E IS MET E IS MET <br /> Minimum Depth to <br /> Ground Water from the iS1-100 25�-50� <br /> Soil Sample (feet) 1i t <br /> it <br /> Fractures in subsurface(applies to foothills �� .lUnkncwn Present <br /> or mountain areas)Average Annual .10-25 <br /> = , Precipitation (inches) ! 26-40\_Z <br /> Man-made conduits which None ' <br /> increase vertical Unknown Present <br /> migration of leachate <br /> Unique site features: None At least <br /> recharge area, coarse q More <br /> soil, nearby weals, etc done than one <br /> COLUMN TOTALS-TOTAL PTS 20 + <br /> J - <br /> RANGE OF TOTAL POINTS 49pts or more 41 - 48 pt's 40pts or less <br /> 4 <br /> MAXIMUM ALLOWABLE 1/50/50/50 .3/.3%1/1 ' NA 3 <br /> B/T/X/E LEVELS (PPM) �- <br /> iI <br /> MAXIMUM ALLOWABLE 1000 100 10 <br /> TPH LEVELS (PPM) <br /> If depth is =' <br /> p greater than 5 ft. and less than 25 ft. , score 0 points. <br /> If depth is 5 ft. or less, this table should not be used. <br /> \, If precipitation is over 40 inches, score110 points. <br /> \. Levels for BTX&E are not applicable at a TPH concentration of 10ppm <br /> -27- <br /> i <br /> a <br />