Laserfiche WebLink
Leaching Potential Analysis for Diesel <br /> Using Total Petroleum Hydrocarbons (TPH) <br /> and Benzene, Toluene, Xylene and Ethylbenzene (BTX&E) <br /> The following 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, 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 total points to the allowable BTX&E and TPH levels. <br /> LOW MEDIUM HIGH <br /> S SCORE S SCORE S SCORE <br /> SITE C 10 PTS C 9 PTS C 5 PTS <br /> O IF CON- O IF CON- O 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* <br /> Ground Water from the 5 40 ' to gw <br /> Soil Sample (feet) <br /> Fractures in subsurface None Unknown Present <br /> (applies to foothills 5 <br /> or mountain areas) <br /> Average Annual <10 9 10-25 26-40** <br /> Precipitation (inches) <br /> Man-made conduits which None Unknown Present <br /> increase vertical 10 <br /> migration of leachate <br /> Unique site features: None At least More <br /> recharge area, coarse 10 one than one <br /> soil, nearby wells, etc <br /> COLUMN TOTALS-TOTAL PTS 2Q + 9 1 + 11 10 I 3.9 <br /> RANGE OF TOTAL POINTS 49pts or more 41 - 48 pts 40pts or less <br /> MAXIMUM ALLOWABLE 1/50/50/50 . 3/.3/1/1 . 3/. 3/.3/.3 <br /> B/T/X/E LEVELS (PPM) <br /> MAXIMUM ALLOWABLE 10000 1000 100 <br /> TPH LEVELS (PPM) - <br /> ** If depth is under 25 feet score 0 points. <br /> If precipitation is over 40 inches score 0 points. <br /> B-2 <br />