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I April 6, 1998 <br /> Page 3 <br /> • included MtBE et - di- <br /> isopropyl t butanol {TBA), di isopropyl ether (DIPE), ethyl tert-butyl <br /> ether (EtBE), and tert-amyl methyl ether (TAME) The two composited stockpile <br /> samples were analyzed for TPPH-g, BTEX compounds, and total lead Analytical data <br /> are summarized in Table 1 and are discussed below The certified analytical reports and <br /> chain-of-custody documentation are presented as Attachment A <br /> Soil samples were initially analyzed for volatile organic compounds by EPA <br /> Method 8260, however, due to a misunderstanding with the laboratory fuel oxygenate <br /> compounds were not included in the analyses When this omission was noted it was <br /> found that MtBE results could be retrieved from the initial EPA Method 8260 analyses, <br /> but not the other oxygenate compounds Therefore, a second round of analyses were <br /> performed for fuel oxygenate compounds, 8 days past the sample hold time <br /> At sample location PD-1, TPPH-g and BTEX compounds were detected in samples <br /> collected at 2 and 5 feet However, the concentrations of each analyte decreased with <br /> depth Benzene was not detected at a depth of 5 feet MtBE was not detected at either <br /> sample depth The other specified oxygenate compounds were not detected 1n the <br /> sample collected at 5 feet <br /> 4t sample location PD-2, TPPH-g, BTEX compounds, and MtBE were detected in <br /> samples collected at 2 and 5 feet However, the concentrations of each analyte <br /> decreased with depth Benzene was not detected at a depth of 5 feet Other specified <br /> oxygenate compounds were not detected in the sample collected at 5 feet <br /> At sample location PD-3, TPPH-g, BTEX compounds, and MtBE were detected in the <br /> 2-foot sample <br /> At sample location PD-4, TPPH-g and BTEX compounds were detected in the sample <br /> collected at 2 feet The sample collected at 5 feet contained detectable levels of <br /> TPPH-g, toluene, ethylbenzene, xylenes, and MtBE Other specified oxygenate <br /> compounds were not detected m the sample collected at 5 feet <br /> Soil analytical data for the stockpiled soils are presented in Table 2 <br /> DISTRIBUTION <br /> A copy of tlus letter should be sent to the following <br /> Mr Michael Infurna <br /> San Joaquin County Public Health Services _ <br /> 304 East Weber Avenue, Third Floor <br /> Stockton, California 95202 <br /> 4 <br /> 3111791A/SOILREP <br />