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PANOCHE BURN SITE REMEDIATION <br /> 3.4.2.1 Ash, Underlying Soil, and Background Samples <br /> On October 23 and 24, 1996, three burn ash samples, two soil samples 3 to 6 inches directly <br /> beneath the burn ash, and four background soil samples were collected by the CIWMB and <br /> CH2M HILL engineers. The burn ash and underlying soil samples were obtained from the <br /> bottom of the ravine next to the old retention dam. The CIWMB engineer intended to retrieve <br /> three underlying soil samples, but the contaminated layer below the ash was impenetrable to <br /> hand tools. Only two locations were found where the "asphalt-like" layer could be penetrated. <br /> The ash samples (AS-1, AS-2, and AS-3) were analyzed for: <br /> > Title 22 Metals,TTLC, EPA Method 6010/7471 <br /> > Title 22 Fluoride, EPA Method 300 <br /> Title 22 Hexavalent Chromium, EPA Method 7196 <br /> > California Assessment Manual (CAM) 17 Metals, STLC, EPA Method 6010/7470 <br /> > CAM-17, STLC Deionized Water (DI) Wet Extraction Test (WET) for Zinc, EPA <br /> Method 6010 <br /> > Total Recoverable Petroleum Hydrocarbons (TRPH), EPA Method 418.1 <br /> > Hardness by Calculation, EPA Method 2340B <br /> > General Minerals/Metals,EPA Method 6010 <br /> > Methylene Blue Active Substances (MBAS), EPA Method 425.1 <br /> > Alkalinity, EPA Method 310.1 <br /> > Electrical Conductivity, EPA Method 120.1 <br /> > Total Dissolved Solids (TDS), EPA Method 160.1 <br /> > Anions, EPA Method 300.0 <br /> > pH, EPA Method 9040 <br /> > Semi-Volatile Organics, EPA Method 8270 <br /> The underlying ash samples (UAS-1 and UAS-2) and background soil samples (BSS-1 <br /> through BSS-4) were analyzed for the same EPA methods, except they were not analyzed for <br /> CAM 17 STLC metals and the STLC DI-WET for zinc. <br /> 3.4.2.2 Confirmation Samples <br /> On November 5, 1996, a black stained area along the northern side slope and the upper end <br /> on the canyon was discovered. The blackened material was 3 to 6 feet below the ash and <br /> asphalt-like layer. Four confirmation soil samples were collected in this area to determine the <br /> composition of the stained soil. CSS-1, CSS-2, CSS-3, and CSS-4 were analyzed for: <br /> > Total Zinc TTLC, EPA Method 6010 <br /> > TRPH, EPA Method 418.1 <br /> > Halogenated Volatile Organics, EPA Method 8010 <br /> CIWMB 25 <br />