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San Joaquin County EHD December 7, 2005 Page 3 of 5 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), approximately 6 inches below the bottom of the former septic tank, according to Mr. David Van Spronsen, who removed the septic tank. According to Mr. Van Spronsen, the septic tank was buried approximately 12-18 inches below the ground surface. The septic tank, which remains on site but is broken into several pieces,was measured to be approximately 5.5 feet in height. 2. Sample D1-6.5 was collected at the approximate location of the distribution box to the two leach lines. The location of the distribution box was estimated based upon the orientation of the two leach lines. The location was selected by tracing each leach line back toward the septic tank and selecting the apparent point of intersection of the two leach lines. Sample D1-6.5 was collected at approximately 6.5 feet bgs. 3. Sample LL1-3 was collected beneath the approximate mid-point of the westernmost leach line, at a depth of approximately 3 feet bgs. 4. Sample P1-3 was collected beneath the end of the westernmost leach line, at a depth of approximately 3 feet bgs. 5. Sample LL2-3 was collected beneath the approximate mid-point of the easternmost leach line, at a depth of approximately 3 feet bgs. 6. Sample P24 was collected beneath the end of the easternmost leach line, at a depth of approximately 4 feet bgs. Samples were collected by driving a six-inch clean brass tube into the soil after removing approximately 3 inches of surface soil to expose native, undisturbed soil. The samples were immediately capped, labeled, and temporarily stored in an ice chest cooled to approximately 4° C. The samples were delivered under chain of custody protocol to Argon Laboratories (FLAP No. 2359) for analysis. The sample locations are shown on a site sketch included as Figure 2. Soil samples were analyzed for the presence of TPHg, TPHd, BTEX, and VOCs using appropriate EPA approved laboratory methods. In addition, soil samples were analyzed for Semi-volatile G:\GROLJNDZE\Berberian\sum—closure.doc