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g NO TECh ENTER RISES P . �- 2 September 2004 SE' To: Ms. Sung H. Pennington 9135 N. Hildreth Lane Stockton, CA 95212 (209) 931-9082 Phone (209) 476-4236 Cell From: Edward W. Finucane,PE, QEP, CSP, CIH Subject: Report#040901-L-F,concerning the measured levels of toxic chemicals in the septic tank located at the fenced back yard of the property identified as: 10285 N. Hildreth Lane Stockton, CA 95212 Sampling of the contents of the septic tank on the property listed above was completed on 3 August 2004. The analyses of the samples obtained were completed on 16 August 2004. These sampling and analytical efforts were accomplished by GeoAnalytical Laboratories,Inc. of Modesto, CA. The certified results of their analyses have been included in the Appendix to this Report, and have been identified as GeoAnalytical Laboratories,Inc.Report No. Q216-17. In every case, only very low concentration levels of four different solvent materials were determined to have been present in this septic tank. The following tabulation provides a summary of: (1) all of the previously listed non-zero solvent concentration results, (2)the septic tank's pH [i.e.,its acidity/alkalinity], and (3) its likely sodium chloride salt concentration level: Table#1 —Contents of the Septic Tank No. EPA Method Analyte Detection Limit Actual Results 1 EPA 150.1 acidity/alkalinity ± 0.01 pH = 6.80 2 EPA 300.0 chlorides 0.1 mg/liter 47.0 mg/liter 3 EPA 8260B ethyl benzene 1.0 pg/liter 2.3 µg/liter 4 EPA 8260B toluene 200 µg/liter 2,940 pg/liter 5 EPA 8260B m,p-xylene 1.0 pg/liter 2.6µg/liter 6 1 EPA 82607p-isopropyltoluene 1.0 pg/liter 15.0 pg/liter Tests designated under EPA Methods 8260B employ a combination of gas chromatography and quadruple mass spectrometry. Please note that the units of concentration listed for the various ana- lytes as results are "pg/liter", a unit that is, in effect,micrograms per kilogram, or,basically, Darts per billion bwei ht or mass. Viewing these results from this perspective, it is clear that none of the listed non-zero results from this sampling is sufficiently high to cause any alarm; thus, it is my judg- ment that no additional remediation on the contents of these tanks is warranted at this time. The five solvent type chemicals that were determined to have been present in this septic tank appear to me to fall into a single class or category—common gasoline. In general and in order: ethyl benzene, toluene, m-xylene,p-xylene, and p-isopropyltoluene (aka p-cymene) are common components of virtually every brand of gasoline—each having a very low human toxicity. In my judgment,it is very unlikely that any of these materials arrived in this septic tank from any aspect of the manufacture of illicit drugs,particularly since I found no evidence at any location in the home at this address that volatile chemicals, acids or bases ofd type had been used or flushed into this septic system. In support of this conclusion, note that the pH of the septic tank was basically neutral, at a value of 6.80; had strong acids (HCl, HI) or strong bases (NaOH+)been flushed into this septic tank,I would al- most certainly have seen pH values either less than 5.50 or greater than 8.50. 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- Address: Telephone: Post Office Box 7835 (209) 473-1113 Fax: (209) 473-1114 (800) 221-9595 E-mail:hi0htechted0jp5.net 5tockton,CA95267-0835