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SECOR <br /> 3.0 FIRST QUARTER 2006 GROUNDWATER MONITORING AND SAMPLING <br /> RESULTS <br /> SECOR gauged depth to water and separate phase hydrocarbon (SPH) thickness in the STTC <br /> wells on February 6, 2006. Groundwater elevation and SPH thickness data are included in <br /> Table 2. SECOR coordinated the first quarter 2006 sampling event at STTC with the ST <br /> Services sampling event scheduled by Ash Creek Consulting. Groundwater elevation data from <br /> ST Services wells are included in Appendix C. <br /> SECOR collected groundwater samples from accessible wells not containing SPH on February <br /> 6 through February 9, 2006. In accordance with the MRP, all samples were submitted for the <br /> following analyses by EPA Method 82608: <br /> • Total petroleum hydrocarbons as gasoline (TPHg), <br /> • Benzene, toluene, ethylbenzene, and total xylenes (BTEX), <br /> • Methyl tertiary butyl ether (MTBE). and <br /> • Total petroleum hydrocarbons as diesel (TPHd) by EPA Method 8015 Modified <br /> In accordance with the MRP, samples from selected wells were also analyzed for the following <br /> fuel oxygenates with EPA Method 8260B: <br /> • Di-isopropyl ether (DIPE), <br /> • Ethyl tertiary butyl ether (ETBE), <br /> • Tertiary butyl alcohol (TBA), <br /> • Tertiary amyl methyl ether (TAME), <br /> • Ethanol, and <br /> • Methanol. <br /> SECOR's field and laboratory procedures are described in Appendix D. Historical groundwater <br /> levels and SPH thickness measurements are provided in Appendix E. Historical groundwater <br /> analytical data are provided in Appendix F. Historical groundwater oxygenate and fuel additive <br /> data are provided in Appendix G. Certified laboratory analytical reports, chain-of-custody <br /> documentation, and field data sheets are provided in Appendix H. <br /> ST-TC 1Q06 Final Report <br /> 770T.43673.12.0002 4 May 1,2006 <br />