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Stantec <br /> Report of Findings for the Waterfront Towers Separate Phase Hydrocarbon Investigation <br /> and Unocal Extraction Well Pilot Study <br /> Waterfront Towers Parking Lot <br /> March 4, 2011 <br /> • Volatile organic compounds including BTEX and fuel oxygenates (including MTBE, <br /> DIPE, ETBE, TAME and TBA) using EPA Method 8260B <br /> • Nitrite and nitrate per EPA Method 300.1 <br /> • Ortho-Phosphate per EPA Method 300.1 <br /> • Total iron per EPA Method 200.7 <br /> 4.5 GROUNDWATER EXTRACTION TESTS PROCEDURE <br /> A submersible pump was employed to extract groundwater from the GWE wells concurrently. <br /> The test equipment configuration consisted of: <br /> • A Grundfos Redi-Flo 4 electric submersible pump with variable frequency drive (VFD) <br /> controller <br /> • A flow totalizer installed in-line with the submersible pump <br /> • An approximately 18,000-gallon plus storage tank with secondary containment <br /> • Miscellaneous fittings, meters, and equipment <br /> The following data were recorded for each GWE well at appropriate intervals: <br /> • Groundwater elevations were measured in the test wells and monitoring points before <br /> testing began <br /> • Time measurements were recorded <br /> • Groundwater levels in test wells and the observation wells were recorded <br /> • Total and instantaneous groundwater flow rate <br /> • Groundwater elevations were measured in the test wells at appropriate intervals after the <br /> equipment was shut down <br /> 4.6 GWE-1 GWE TESTS DATA AND RESULTS <br /> GWE-1 was operated in the GWE mode for approximately three hours on November 16, 2010. <br /> Field notes are included in Appendix H. The following is a summary of the data collected during <br /> the test. <br /> The average GWE rate for GWE-1 was approximately five and a half gallons per minute (gpm) <br /> with a total production of 1,000 gallons. Groundwater production rates decreased to <br /> approximately <2.0 gpm by the end of the test. Groundwater extraction data is presented in <br /> Table 3. <br /> The inlet of the submersible pump was set at approximately 15.00 feet bgs inside GWE-1. The <br /> depth-to-water prior to extraction was 12.70 feet bgs. During the GWE test on GWE-1, <br /> groundwater elevations in two wells (GWE-2 and MW-72) were monitored. Groundwater <br /> 4.8 <br />