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San Joaquin County EHD May 16, 2005 Page 2 of 5 The contents of the septic system were pumped into a 1,200-gallon tank for storage on site. The septic tank was triple rinsed and pressure washed. All wash water was transferred to the storage tank. Ground Zero collected a water sample from the storage tank on October 21, 2004. Appropriate containers were delivered under chain of custody protocol to Argon Laboratories in Ceres, California and Alturas Analytics, Inc. of Moscow, Idaho. Samples submitted to Argon were analyzed for total petroleum hydrocarbons as gasoline (TPHg) using EPA Method 8015B, benzene, toluene, ethylbenzene, and xylenes (BTEX) using EPA 8021B, and volitile organic compounds (VOCs), expanded to include acetone, by EPA 8260. Samples submitted to Alturas were analyzed for methamphetamines by HPLC/MS/MS, total phosphorus by SM 4500 PF, iodide and chloride by EPA 300.0, and pH by EPA 150.1. The wastewater sample contained elevated levels of VOCs, including TPHg at 2,800 micrograms per liter(µg/L), benzene at 6.3 µg/L, and chloroform at 230 µg/L,all of which are above drinking water standards. Methamphetamine was detected at 0.26 micrograms per milliliter (µg/ml). No drinking water standard has been developed for methamphetamine. Analytical results of the wastewater collected from the temporary tank are summarized in Table 1. SITE ACTIVITIES Prior to any sampling a Ground Zero geologist conducted a site inspection to mark the drilling locations for clearance by Underground Service Alert (USA), as required by law. During the site inspection it was discovered that the property owner had removed the septic tank. According to Mr. Van Spronsen the septic tank was removed but no additional soil was excavated. The septic tank remains on site pending disposal. At the request of Ground Zero and EHD, Mr. David Van Spronsen used a backhoe to expose the leach lines to allow the collection of soil samples at selected locations beneath the leach lines and beneath the former septic tank and distribution box. No leach pits were identified at the ends of the leach lines. Mr. Van Spronsen indicated that leach pits could not be installed due to the presence of hard pan at a depth of approximately 5 to 6 feet bgs. In addition, Mr. Van Spronsen indicated that he did not find the distribution box when the septic tank was removed. A Ground Zero field technician collected six soil samples on April 8, 2005. Mr. Michael Infurna of EHD conducted a site inspection to witness sampling activities. Sample locations were selected by Ground Zero staff after conferring with Mr. Infurna.A total of six soil samples were collected at the following locations: 1. Sample T1-7 was collected at a location identified as the former location of the septic tank. The sample was collected at a depth approximately 7 feet below the ground surface (bgs), G:\GROLTNDZE\Berberian\SBreport.doc