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F I <br /> 2 <br /> Assumptions, Formulae, Conversions, Computations <br /> 1. Septic Tank volume 1,600 gallons = 6,056 liters (1,600 allons){3.785 liters <br /> ) = 6,056 liters <br /> gallon <br /> 2. Assume that the Septic Tank is completely full of liquid, i.e.,this tank contains 6,056 liters of liquid <br /> 3. 1.0 A = 1.0 b mass — 1.0 µgrams -6 grams _3 liters of water, 9 grams <br /> µg pp ( ) ( )( 1.0 x 10 )(1 x 10 } = 1 x 10- = 1.0 ppb(mass) <br /> liter of water µgram gram billion grams <br /> 4. (1.0 µgrams)(1.0 X 10-3 milligrams)(tankvolume in liters) = milligrams of chemical in the tank = mg of chemical in the tank <br /> liter µgrams <br /> 5. 1.0 milliliters = 1.0 ml = 1.0 cm3 = 1.0 cc <br /> (mg of chemical)(1x10-3 grams) <br /> 6. density in grams <br /> mg = milliliters of chemical in the tank = nil of chemical in the tank <br /> cc <br /> 7. 1 A ml = 0.203 teaspoons <br /> CONCLUSIONS: <br /> 1. The quantity of vehicle gasoline in this septic tank is so insignificantly small (a total of 1.222 equivalent teaspoons of gasoline)that I <br /> do not believe anything additional needs to be done. I certainly do not believe that the tank needs to be pumped,nor do I believer that <br /> monitoring wells need to be installed in the septic tank's leach field. With regard to the total organics in this tank(gasoline+acetone), <br /> the tank contains an equivalent of only 1.372 teaspoons of organics. Expressed as a percentage of the tank's total volume,this <br /> amounts to only 0.000112% of the total tank volume. <br /> 2. In the event that the tank is found to be less than 100%full of liquid--i.e., if it contains less than 6,056 liters of liquid–then the <br /> equivalent amount of organics will be proportionally less by the fractional level to which the tank is actually filled. For example,if <br /> there were only 2,000 liters of liquid in this tank(approximately 33% of its capacity)then the equivalent amount of organics in it would <br /> be this fraction multiplied by the 1.372 teaspoons. On the assumption that the tank actually does contain only 2,000 liters of liquid, <br /> then the total volume of organics in it would be 0.453 teaspoons! <br /> In the event you have any questions on any of these calculations,determinations, or conclusions please do not hesitate to call me. <br /> Edward W. Finucane, PE, CSP, QEP,CIH <br /> �ti , <br />