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Stantec <br /> First Quarter 2011 Status Summary Report <br /> Former Tosco Bulk Terminal No. 10013 <br /> April 29,2011 <br /> • DIPE was detected in 5 wells at concentrations ranging from 0.85 pg/L (MW-20) to <br /> 8.1 pg/L (MW-17B). <br /> • BTEX, ETBE, and TAME were not detected above the laboratory reporting limits in the <br /> samples collected. <br /> • Methanol was not detected above the laboratory reporting limit in the samples collected. <br /> Reported concentrations of constituents were compared with the analytical results from the <br /> previous quarters for wells MW-4, MW-8, MW-14, MW-17B, MW-20, MW-21B, and MW-22C <br /> with the following results: <br /> • TPH-g and BTEX concentrations continue to remain at low to non-detectable levels <br /> since the previous quarter. <br /> • TPH-d concentrations decreased in monitoring well MW-8, MW-14,' MW-17B, and <br /> MW-21B, and 22C. <br /> • MTBE concentrations continue to remain consistently at low or non-detectable levels. <br /> • TBA concentrations continue to remain consistently at low or non-detectable levels. <br /> • DIPE concentrations continued to remain at or near non-detectable levels. <br /> • Methanol was not detected above the laboratory reporting limit at the site. <br /> Quality Control Data Review <br /> A quality assurance/quality control (QA/QC) review was performed for sample integrity and <br /> analytical methods in the laboratory. Laboratory and field QC sample results were evaluated to <br /> assess the quality of individual sample results and overall method performance. The QA/QC <br /> review included an evaluation of the following: <br /> • Blanks (method) <br /> • Spikes (surrogates, laboratory control samples, and matrix spikes) <br /> • Duplicates (laboratory control spikes, and matrix spikes) <br /> • Sample integrity (chain-of-custody documentation, sample preservation, and holding <br /> time compliance) <br /> • Lab qualifiers (to determine impact on sample results) <br /> • Based on the QA/QC evaluation of above parameters, no systematic problems were <br /> detected and the overall data objectives were met. All samples were analyzed within the <br /> method-specific holding time criteria. <br /> 5 <br />