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The following table was designed to permit estimating the <br />concentrations of TPH and BTX&Z that can be laft in place without <br />threatening ground water. Three levels of TPH,and BTX&$ <br />concentrations wars derived (from modeling) for,sites which fall into <br />categories of low, medius or high leaching potential. To use the <br />table, find the appropriate description for each of the features. <br />Score each feature using the weighting system shown at the top of <br />each column. Sum the points for each column and total thea. Match <br />the total paints to the allowable BTX&I and TPH levels. <br />8 SCORE 8 SCORE S SCORE <br />SITE C 10 PTS C 9 PTS C 5 PTS <br />O IF CON- 0 IF CON- O IF CON- <br />FEATURE R DITION R DITIOH R DXTION <br />8 I8 MST I-S IS HET E IS )WT <br />1- Minimus Depth to >100 51-100 25-50\3, <br />Ground Water from the <br />soil sample (foot) <br />2- Fractures in subsurface None Unknown Present <br />(applies to foothills <br />or mountain areas) _ <br />3- Average Annual <10 10-25 26-40\2, <br />Precipitation (inches) <br />4- Kan-made aonduita which None Unknown Present <br />increase vertical <br />migration of leachato <br />5- Unique site features= None At least More <br />recharge area, coarse one than one <br />soil, nearby wells, etc <br />6- COLUMN TOTALS-+TOTAL PTS t + <br />7- RANGE OF TOTAL POI)rs$ 49pts or more 41 - 48 pts 40pta or lose <br />8- MAXXXUH ALLOWABLE 1/50/50/30 03/.3/I/1 N7►�, <br />B/T/X/E XX"jj (PPM) <br />9- MAXIMUM GASOLINX 1000 100 10 <br />ALLOWABLE TPH <br />L$VELS (PPM) DIESEL 10000 1000 100 <br />If depth is greater than 5 ft, and less than 25 ft,, score <br />Opoints. <br />If depth is 5 fte or less, this table should not be used, <br />if precipitation is Aver 40 inches, score 0 points. <br />Levels for BTXAR are not applicable at a TPH concentration of <br />lappa (gasoline) or 10oppa (diesel) <br />Table 2 <br />Leaching Potential Analysis for Gasoline and Diesel <br />Using Total Petroleum Hydrocarbons (TPN) <br />and Benzene, Toluene, Xylene and Ethylbenzene (BTX & E) <br />(Source California Leaking Underground Fuel Tank Assessment Manual) <br />6 <br />