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wy ROW <br /> Y t.)'o�' �,K Y.. ;T�^•�^��-:'"rf'+- 7s:.�F �, r �1x•. "�i{ !?• r.,YF s:.SJY• �,, 4•,r f ,. <br /> y 7Y <br /> r � r r°- �-r n - ,• Lf' ti !, Y : —•y-.y 7 r t F _,r, Y �, <br /> �, �4 n -��^ -'w 1T �+-..r. moi""` 7� +,�• 9�+ �L $"� i. y, �+ i}tY ` 4. _� .dr<,, �, r_�,,,�.,y- r1^a r r ,i <br /> 7.5� .:;•. -r_ ...s,�.,-.+ -:.�.. �. x f.:�. ry-:, .- °-;!Qy r -- —��:l.W... -��-�.�•P�...��`s -�.. '..�.�..:.." 5" •'r r__� -�L .' -:,.ry..>'.�t- _ _ �_�, .�,.'S� <br /> s.� <br /> - <br /> r <br />�7r r <br /> r <br /> f <br /> Table 2-1 <br /> Leaching Potential Analysis for Gasoline <br /> Using Total Petroleum Hydrocarbons(TPH) <br />.,a and Benzene, Toluene, Xylene and Ethylbenzene (BTX&E) <br /> The f0110=.-�.ng 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 /> r modeling) for sites which fall into categories 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 /> shown at the top of each column. Sum the points for each column and total <br /> them. Match the tonal points to the allowable BTX&E and TPH levels. <br /> 4: <br /> S SCORE S SCORE S SCORE <br /> SITE C 10 PTS C 9 PTS C 5 'PTS <br /> O IF CCN- O IF CON- 0 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 <br /> soil Sample (feet) <br /> Fractures in subsurface None Unknown Present <br /> (applies to foothills LD <br /> or mountain areas) <br /> Ave_age Annual t10 10-25 26-40\2 <br /> Precipitation (inches) q <br /> Man-made conduits which None 1 Unknown Present <br /> increase vertical /Q <br /> migration of leachate <br /> Unicue site features: None At least More <br /> recharge area, coarse q one <br /> than one <br /> soil, nearby wells, etc <br /> COLUMN TOTALS-TOTAL PTS 20 +� Ib + <br /> E <br /> RANGE OF TOTAL POINTS 49pts or morM48 ts ar less <br /> MAXIMUM ALLOWABLE 1/SO/50/50NA\\B/T/X/E LEVELS (ppM) <br /> MAXIMUM ALLOWABLE 100010 <br /> TPH LEVELS (PPM) <br /> `] Zf depth is 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 /> \7 If precipitation is over 40 inches, score 0 points. <br /> Levels for BTX&E are not applicable, at a TPH concentration of 10ppm <br /> -27-- <br />