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collected from approximately 2 feet under the dispensers and 2 feet below the piping at <br />approximately 3 to 4 feet below grade (bg). One soil sample was collected by hand from <br />the stockpile (SP1). <br />From soils in the auger bucket, samples were collected in a 2 -inch diameter by 3 -inch long <br />brass sleeve. The sleeve was sealed by Teflon tape and polyethylene caps, and was placed <br />in a clean, chilled, field ice chest. The auger bucket was decontaminated between samples. <br />Samples were delivered to Alpha Scientific Corporation of Cerritos, California (ELAP <br />Certificate Number 2633). <br />Samples were silty sands and sandy silts, with some silty clays. These soils are characteristic <br />of sediments laid down by stream deposition in alluvial environments. Fragments of brick <br />were found in several samples, indicating the soil had previously been disturbed. <br />Laboratory Analyses and Results <br />The laboratory was instructed to analyze the soil samples fortotal petroleum hydrocarbons <br />as gasoline (TPH-gas) and methanol using United States Environmental Protection Agency <br />(U.S. EPA) Method 8015, for volatile organic compounds (VOCs) including benzene, <br />toluene, ethylbenzene, and xylenes (BTEX), 1-2-dichloroethane (1,2 -DCA), ethylene <br />dibromide (EDB), and the oxygenates methyl tertiary butyl ether (MTBE), ethyl tertiary butyl <br />ether (ETBE), di -isopropyl ether (DIPE), tertiary amyl methyl ether (TAME), tertiary butyl <br />alcohol (TBA), and ethanol using U.S. EPA Method 826013, and for total lead using U.S. EPA <br />6010. <br />Samples with compounds reported by the laboratory above the method detection limit <br />(MDL) are tabulated below. No methanol, 1,2 -DCA, EDB, TAME, DIPE, ETBE, TBA, or <br />ethanol were reported in any of the samples collected. Certified analytical results and the <br />chain -of -custody forms are attached. <br />SAMPLES WITH COMPOUNDS REPORTED ABOVE MDL <br />in milligrams per kilogram <br />(m /k ) <br />Sample <br />D7 <br />D8 <br />P4 <br />P7 <br />SP1 <br />TPH- as <br />1.2 <br />ND (0.2) <br />ND (0.2) <br />ND (0.2) <br />15.2 <br />Benzene <br />0.0186 <br />0.0031 <br />ND (0.001) <br />ND (0.001) <br />N -D(2. 5) <br />Toluene <br />0.687 <br />0.0037 <br />ND (0.001) <br />ND (0.001) <br />ND (2.5) <br />Eth (benzene <br />0.106 <br />ND (0.001) <br />ND (0.001) <br />ND (0.001) <br />0.623 <br />Total Xylenes <br />0.497 <br />0.0023 <br />0.0018 <br />ND (0.001) <br />1.260 <br />Iso ro (benzene <br />ND (0.002) <br />ND (0.002) <br />ND (0.002) <br />ND (0.002) <br />0.0114 <br />n-Propylbenzene <br />ND (0.002) <br />ND (0.002) <br />ND (0.002) <br />ND (0.002) <br />0.0469 <br />1,3,5-Trimeth (benzene <br />ND (0.002) <br />ND (0.002) <br />ND (0.002) <br />ND (0.002) <br />0.666 <br />1,2,4-Trimethyl benzene <br />0.0025 <br />ND (0.002) <br />ND (0.002) <br />ND (0.002) <br />1.820 <br />n -But (benzene <br />ND (0.002) <br />ND (0.002) <br />ND (0.002) <br />ND (0.002) <br />0.0260 <br />Naphthalene <br />ND (0.002) <br />ND (0.002) <br />ND (0.002) <br />ND (0.002) <br />0.0688 <br />MTBE <br />ND (0.002) <br />ND (0.002) <br />ND (0.002) <br />1 0.0030 <br />1 ND (0.005) <br />ND = not detected at or above limits listed in parentheses <br />071001/TLM Stockton Report.doc 2 <br />January 29, 2008 UE f Q VAP <br />P S <br />