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Table 2-1 <br /> Leaching Potential Analysis for Gasoline and Diesel <br /> Using Total petroleum Hydrocarbons(TPH) <br /> and Benzene, Toluene, Xylene and .Ethylbenzene (BTX&E) <br /> ` The foilc;wing table was designed to <br /> concentrations of TPH and $TX&E thatpermzt estimating the <br /> threatening ground water. Three levelsnofeTPHfandnBTX&Ee without <br /> concentrations were derived (from modeling) for sites which fall into <br /> categories of low, medium or high leachin <br /> table, find the appropriate description fog <br /> preach tOfltheTfeaatures . <br /> Score each feature using the weighting system shown at the top of <br /> each column. Sum the points for each column and total them. <br /> Match3 the total points to the allowable BTX&E and TPH levels. <br /> SITE S SCORE S SCORE <br /> C 10 PTSC 9 PTS S SCORE <br /> C 5 PTS <br /> FEATURE 0 IF CON- 0 IF CON-ON O IF CON- <br /> R DITI <br /> . R DITION R DITION <br /> E <br /> IS MET E IS MET E IS MET <br /> Minimum Depth to <br /> Ground Water from the >100 51-100 <br /> ,^• Soil Sample (feet) 25-50� <br /> Fractures in subsurface <br /> (applies to foothills O None Unknown <br /> or mountain areas) Present <br /> Average Annual <br /> . <br /> Precipitation {inches) <10 10-25 <br /> 26-40`2 <br /> Man-made condrits which <br /> increase vert4cal D None Unknown <br /> migration of leachate l Present <br /> Unique site features: <br /> recharge areaNone At least <br /> sail coarse More <br /> nearuy wells, etc one than one <br /> COLUMN TOTALS-TOTAL PTS <br /> RANGE OF TOTAL POINTS 49pts or more <br /> 41 - 48 pts 40pts or less <br /> MAXIMUM ALLOWABLE 1/50/50/50 3 <br /> B/T/X/E LEVELS (PPM) /•3/1/1 NA\ <br /> ' MAXIMUM GASOLINE <br /> ALLOWABLETPH 1000 100 <br /> LEVELS ZO <br /> `^ (PPM} DIESEL 20000 <br /> 1000 100 <br /> - <br /> If depth is greater than 5 ft. <br /> points. and les s..than .25 ft., score .0 <br /> If depth is 5 ft. or less, this table should not be used. <br /> \? If precipitation is <br /> 4� Levels for BTX over 40 inches, score 0 points. <br /> &E are not applicable at a TPH concentration of <br /> 6PP )ine) or <br /> , Page 2727. 100ppm (diesel) (For explanation see step <br /> 29 <br />