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San Joaquin County EHD May 16, 2005 Page 3 of 5 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 131-6.5 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 P2-4 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 (ELAP No. 2359) for analysis. The sample locations are shown on a site sketch included in Attachment A. Field notes are included in Attachment B. SOIL ANALYTICAL RESULTS Soil samples were submitted to Argon Laboratories for analysis of total petroleum hydrocarbons as gasoline (TPHg) and diesel (TPHd) using EPA Method 8015B, benzene, toluene, ethylbenzene, and xylenes (BTEX) using EPA Method 8021B, Volitile Organic Compounds (VOCs) using EPA Method 8260B, Semi-volatile Organic Compounds (SVOCs) using EPA Method 8270, and total recoverable petroleum hydrocarbons(TRPH)by EPA Method 418.1. No petroleum hydrocarbon constituents, including VOCs, were detected above the method detection limits in the soil samples collected from beneath the septic tank (T1-7), the distribution G:\GROUNDZE\Berberian\SBrepoct.doc