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Hiqh TEch ENTERPRISES 12 November 2003 03 NOV 13 PH' 2; OS To: Mrs. Rosalie Togninali 14500 East Highway 4 Stockton,CA 95215 (209)948-0494 Telephone (209)401-8923 Cell Phone From: Edward W.Finucane, PE,QEP,CSP, CIH Subject: Report#031001.-L-F,concerning the measured levels of toxic chemicals in the two septic tanks on the property located at: 15420 East Highway 4 Stockton, CA 95215 Sampling of the contents of the two septic tanks on the property listed above was completed on 28 October 2003. The analyses of these samples were completed on 31 October 2003. 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.P-301-11. In every case,only exceedingly low concentration levels of seven different solvent materials were determined to have been present in these two septic tanks. The following two tabulations provides a summary of all of these non-zero results: T_ #1 A—Sotic T k A No. EPA Method Analyte Detection Limit Actual Results g31 EPA 150.1 acidity/alkalinity 0.01 pH = 8.50 2 EPA 8260B toluene 1.0 jig/liter 8.3 µg/liter EPA 8260B trichlorotrifluoroethane 1.0µg/liter 2.1 µg/liter Table RIB—Sofic Talc B No. EPA Method Analyte Detection Limit Actual Results ff2EPA 150.1 acidity/alkalinity 0.01 pH= 7.40 8260B toluene1.0µg/liter 9.3 µg/liter 8260B ethyl benzene 1.0µg/liter 2.0µg/liter 4 EPA 8260B m-&p-xylene(total) 1.0µg/liter 9.3µg/liter 5 EPA 8260B o-xylene 1.0 jig/liter 1.4µg/liter 6 EPA 8260B 1,4-dichlorobenzene 1.0µg/liter 10.0µg/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"µg/liter",a unit that is, in effect,micrograms per kilogram,or,basically, aFP 1r 'll lion 12,y weii -Qr mas . Viewing these results from this perspective,it is clear that none of the. listed non-zero results from the 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. In general,the seven chemicals that were determined to have been present in these two septic tanks appear to me to fall into two separate and distinct categories or classes. Toluene,ethyl benzene,and all the isomers of xylene are common components of gasoline,while trichlorotrifluoroethane(aka: Freon 113) and 1,4-dichlorobenzene(aka: p-dichlorobenzene and/or moth crystals) are likely compo- nents of a variety of different pesticides or herbicides. I would guess that the most likely mechanism for the transport of these chemicals into these two septic tanks would have been soil diffusion. I think it is unlikely that they arrived there from any aspect of the manufacture of illicit drugs,particu- Tclephane: Address: (209) 473-1113 Fax: (209) 473-1114 Foot Office Box 7835 5tackCon,CA 95267-0835 (800) 221-9595 E-mail:hightachtedOjps.net