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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 /> Table of Contents <br /> 1.0 INTRODUCTION ..............................................................................................................1.1 <br /> 2.0 SITE BACKGROUND.......................................................................................................2.2 <br /> 2.1 SITE DESCRIPTION ........................................................................................................2.2 <br /> 2.2 PREVIOUS INVESTIGATIONS AND REMEDIAL ACTION...............................................2.2 <br /> 3.0 WATERFRONT TOWERS SPH INVESTIGATION ...........................................................3.1 <br /> 3.1 PRE-FIELD ACTIVITIES...................................................................................................3.1 <br /> 3.1.1 Site Health and Safety Plan................................................................................3.1 <br /> 3.1.2 Access and Permitting........................................................................................3.1 <br /> 3.2 SPH DETERMINATION USING UVOST/CPT DRILLING TECHNOLOGY........................3.1 <br /> 3.2.1 Borehole Clearance ...........................................................................................3.2 <br /> 3.2.2 DP-22 Verification Borehole-Continuous Core ...................................................3.2 <br /> 3.2.3 CPT Direct Push-Soil Lithology..........................................................................3.3 <br /> 3.2.4 UVOST Direct Push SPH Determination............................................................3.3 <br /> 3.2.5 Investigation Derived Waste...............................................................................3.3 <br /> • 3.3 SPH ASSESSMENT FINDINGS.......................................................................................3.1 <br /> 3.3.1 Summary of Site Geology and Hydrogeology.....................................................3.1 <br /> 3.3.2 DP-22 Verification Borehole- Continuous Core and CPT Lithology.....................3.1 <br /> 3.4 SOIL ANALYTICAL RESULTS..........................................................................................3.1 <br /> 3.5 UVOST RESULTS............................................................................................................3.2 <br /> 3.6 UVOST MODELS BY DAKOTA TECHNOLOGIES ...........................................................3.3 <br /> 3.7 SPH ASSESSMENT CONCLUSIONS ..............................................................................3.3 <br /> 4.0 GROUNDWATER COLLECTION TRENCH AND PUMPING TEST FINDINGS ...............4.4 <br /> 4.1.1 Site Health and Safety Plan................................................................................4.4 <br /> 4.1.2 Access and Permitting........................................................................................4.4 <br /> 4.2 GROUNDWATER EXTRACTION WELLS GWE-1 AND GWE-2.......................................4.5 <br /> 4.2.1 Borehole Clearance ...........................................................................................4.5 <br /> 4.2.2 Drilling, Logging, and Well Installation................................................................4.5 <br /> 4.2.3 Well Development..............................................................................................4.6 <br /> 4.2.4 Well Surveying ...................................................................................................4.6 <br /> 4.2.5 Investigation Derived Waste...............................................................................4.6 <br /> 4.3 PUMP TEST AND FEASIBILITY STUDY..........................................................................4.7 <br /> 4.4 ANALYTICAL LABORATORY TESTING ..........................................................................4.7 <br /> 4.5 GROUNDWATER EXTRACTION TESTS PROCEDURE .................................................4.8 <br /> 4.6 GWE-1 GWE TESTS DATA AND RESULTS....................................................................4.8 <br /> 4.7 GWE-2 GROUNDWATER EXTRACTION TESTS DATA AND RESULTS ........................4.9 <br /> 4.8 TWO-PHASE EXTRACTION TESTS PROCEDURE ......................................................4.10 <br /> is <br /> 4.9 GWE-1 TPE TESTS DATA AND RESULTS....................................................................4.11 <br /> 4.10GWE-2 TWO-PHASE EXTRACTION TESTS DATA AND RESULTS ................:............4.12 <br /> One Team.Infinite Solutions. <br /> TW Stockton SPH Assessment and JOU Pilot Test Report.FINAL.doc <br />