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Mr. Mike Infurna Page 2 of 4 detected in any sample was toluene in the sample collected from the septic tank. Toluene was present at a concentration of 2,700 parts per million(ppm). It should be noted that the high level of toluene or other organics compelled the lab to dilute the sample and, consequently, the detection limits for the analytes were elevated, ranging from 50 to 250 ppm. ESSI concluded that there did not appear to be any drug lab residues inside the mobile home and that it was safe for occupancy. ESSI recommended that the septic tank be drained of its contents. The septic system was taken out of use and the tank contents were pumped out and are currently stored in seven drums on the property. Some liquid remains in the septic tank as a result of a faucet inadvertently left on in the mobile home. Ground Zero was retained by the current property owner to investigate whether the contents of the septic system had caused a condition of soil contamination and to advise him on the most cost-effective method of disposing of the septic waste. Ground Zero submitted a Workplan to San Joaquin County Environmental Health Department (EHD) on March 18, 2001 EHD approved the Workplan on March 29, 2002, Fieldwork Fieldwork was conducted on April 10, 2002. Mr, Mike Infurna observed the field activities on behalf of EHD; excavation was performed by the property owner, Mr. Mike Kooyman, and sampling was conducted by Mr. Sean Garvey of Ground Zero. All samples were analyzed by State-Certified Argon Laboratories (FLAP No. 2359). Soil Sampling A backhoe was utilized to locate and expose the leach lines and two sampling points were agreed upon by Mr. Garvey and Mr. Infurna. Soil samples KP LL-1 and KP LL-2 were respectively collected from approximately 2 feet and 1 foot beneath the lines. The samples were collected in clean brass tubes which were then sealed with teflon tape and plastic end caps. The samples were stored in a chilled ice chest and transported to the laboratory under chain of custody protocol. A photoionization detector (PID)was used to field-screen the samples for volatile components. PID readings from both samples were zero. The locations of the soil sampling points are shown on Figure 2. Waste Sampling Liquid samples from drums identified as DMI, DM2, DM3, DM6 and DM7 were collected with disposable bailers and placed in appropriate containers. A liquid sample was also collected from the septic tank. Samples of sludge contained in drums DM4 and DMS were collected in soil tubes. All samples were stored in a chilled ice chest and transported to the laboratory under chain of custody protocol. All work was conducted in accordance with Ground Zero's Quality Assurance/Quality Control Plan and Site-Specific Health and Safety Plan on file with EHD. Field notes are included in Attachment A.