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...001 High TECH ENTERPRISES rameters, and Conversion Factors that were used to develop these solvent volumes have been listed on below. -- Assumptions: 1. The septic tank on this property has a capacity of 1,200 gallons. 2. This septic tank was fillet to 50%of its capacity at the time of its sampling(i.e., it 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: Elements of Physical 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= 1 milliliter). Tabulation of the Physical Parameters and the Conversion Factors involved: 1. The densities of the five chemicals found to have been present in this septic tank are as follows: ethyl benzene [p =0.867 gms/cm3], toluene [p =0.865 gms/cm3], m-xylene [p =0.950 gms/cm3], p-xylene [p = 0.866 gms/cm3], &p-isopropyltoluene [p = 0.860 gms/cm3]. 2. 1 gallon= 3.785 liters; therefore, 600 gallons=2,271 liters. The goal of the following calculation is to provide an estimate of the volume of each of these chemi- cals that would have been required to produce the laboratory determined concentrations found in this septic tank. The formula is as follows: tank concentration, µgms/liter)(2,271 liters/tank) Solvent Volume, in drops = solvent density, gms/cms)(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 five chemicals,and(5)the conversion factor for gallons to liters, the following tabulation lists the volume of each of these five 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. Table#2—Solvent Volumes in the Septic Tank, listed in "drops" No. Analyte Volume 3 ethyl benzene 0.4 drops 4 toluene 494.8 drops/7.7 cc 5 m-xylene(50%) 0.2 drops 6 p-xylene (50%) 0.2 drops 7 p-isopropyltoluene 2.5 drops From the perspective of the equivalent volumes of solvents that were measured to have been present in this half full septic tank,it is extremely impressive how remarkably sensitive the EPA 8260B proce- dure is! As stated earlier, in my judgment,these concentrations are insignificant and require no addi- tional remediation or monitoring whatsoever. Should you have any questions on any of the data, or the conclusions of this Report, please do not hesitate to contact me. Thank you very much for permittin me to be of service to you in this matter. - CSP'' Sincerely, � W.FjNGEdward W.W.Finucane,PE, QEP, CSP, CIH 49 No.13749 EWF wf Exp:12-31-2005 :'EpHjjylyplN,FINUCANE g aunn fine I- - - ! xc: Alan Biedermann,R. E. H. S. *s?'FOHAN�cP��P ��•`�`pppO OF 1, `0 9517 �0 2�� San Joaquin County Public Health Services 9�OFCA��FO� \y /� CERT NO. • �� 3743 ,�•��\`\ VW*•