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High TECh ENTERPRISES . larly since I found no evidence at any location in the structure that volatile chemicals of any type had been flushed into the septic system. To place the laboratory mass concentration results in a more familiar context,please consider the fol- lowing set of calculations. The calculation relationship as well as all the Assumptions,Physical Pa- rameters, arameters,and Conversion Factors that were used to develop these solvent volumes have been listed on below. ASSUBMdo 1. Each of these two septic tanks on this property has a capacity of 1,200 gallons. 2. Each of these two septic tanks was fillet to 50%of its capacity at the time of their sampling(i.e., each tank contained 600 gallons of septic fluid). 3. A single drop of water has an approximate volume of 0.0156 cubic centimeters(using as a ref- erence: eference:Elements of Msical Chemistry,by Samuel Glasstone,published by D. Van Nosrand Company,Inc.,which states that approximately 64 drops of water are required to produce a vol- ume of 1 cubic centimeter). Tabulation of the ftakd Fame=and dMe COUMim Factors invOlv 1. The densities of the seven chemicals found to have been present in these two septic tanks are as follows: toluene [0.865 gms/cm3],ethyl benzene [0:867 gms/cm3],m-xylene [0.884 gms/cm3], p-xylene [0.866 jins/cm3], o-xylene [0.870 gms/cm], 1,4-dichlorobenzene [1.241 gms/cm3], and trichlorotrifluoroethane [1.570 gms/cm3]. 2. 1 gallon= 3.785 liters;therefore, 600 gallons=2,271 liters. The goal of the following calculations is to provide an estimate of the volume of each of these chemi- cals that would be required to produce the laboratory determined concentrations found in these two tanks. The formula is as follows: (tank concentration, µgms/liter)(2,271 liters/tank) Solvent Volume, in drops = 3 (solvent density, gms/cm )(106 µgms/gm)(0.0156 cm3/drop) On the basis of. (1)the relationship listed immediately above, (2)the lab concentration results, (3)the three assumptions,(4)the physical density parameters of the seven chemicals, and(5)the conversion factor for gallons to liters,the following tabulations list the volume of each of these seven chemicals— again in drops(as from an eye dropper)—that would have to have been added to each septic tank in order to have produced the concentrations that were determined by GeoAnalytical Labs. TaWe 2A—Swdq T4nLA No. Anal Volume,in dro s 1. toluene 1.40 drops tdchlorotdfluoroethane 0.19 drops 2. s Table 2A—Septic Tank B " No. Analyte. Volume,in drops 1. toluene 1.57 drops 2. ethyl benzene 0.34 drops 3. m-&p-xylene(total) 1.55 drops 4. o-xylene 0.23 drops 5. 1,4-dichlorobenzene 1.17 drops From the perspective of the equivalent volumes of solvents that were measured to have been present in these two half full septic tanks,it is extremely impressive how remarkably sensitive the EPA 8260B procedure is! In my judgment,these concentrations are insignificant and require no additional reme- diation or monitoring whatsoever.