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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 /> 3.0 WATERFRONT TOWERS SPH INVESTIGATION <br /> On August 17, 2010, Stantec field personnel observed Cruz Brothers (Cruz) perform a private <br /> geophysical survey of the subsurface materials in the Waterfront Towers parking facilities and <br /> within the proposed areas of investigation (Figure 3). Between August 23 and August 26, 2010, <br /> Stantec field personnel observed Gregg Drilling perform borehole clearance activities using an <br /> air-knife tool in the proposed project investigation area. On August 30, 2010, Stantec field <br /> personnel observed Gregg Drilling use a CPT direct push rig to continuously core one borehole <br /> to approximately 61 feet bgs. Between August 31 and September 2, 2010, Stantec field <br /> personnel observed Gregg Drilling use a CPT rig equipped with Ultra Violet Optical Screening <br /> Tool (UVOST) direct push eight boreholes to depths of approximately 60 to 65 feet bgs at the <br /> locations shown on Figure 3. The completed scope of work is discussed below. Field and <br /> laboratory procedures are documented in Appendix B. <br /> 3.1 PRE-FIELD ACTIVITIES <br /> 3.1.1 Site Health and Safety Plan <br /> • As required by the Occupational Safety and Health Administration (OSHA) Standard <br /> "Hazardous Waste Operations and Emergency Response" guidelines (29 CFR 1910.120), and <br /> by California OSHA (Cal-OSHA) "Hazardous Waste Operations and Emergency Response" <br /> guidelines (CCR Title 8, Section 5192), a site-specific Health and Safety Plan (HASP) was <br /> prepared. Prior to the commencement of fieldwork, the HASP was updated with appropriate <br /> field personnel and subcontractor information. The field staff and contractors reviewed the <br /> HASP before beginning field operations at the Site. <br /> 3.1.2 Access and Permitting <br /> Prior to the initiation of field work, access agreements between the L&M OU Group and the <br /> SRDA and the Waterfront Office Towers Owners Association (WOTOA) were obtained. Prior to <br /> drilling, well construction permits were obtained from the San Joaquin County Environmental <br /> Health Department (SJCEHD) and the City of Stockton Public Works Department, respectively. <br /> Copies of the permits are provided in Appendix C. <br /> 3.2 SPH DETERMINATION USING UVOST/CPT DRILLING TECHNOLOGY <br /> Nine 2-inch diameter exploratory direct push borings (DP-22 through DP-30) were deployed at <br /> the locations shown on Figures 2 and 3. Exploratory boring DP-22 was installed by Gregg <br /> Drilling using a CPT rig with direct push rods; however CPT technology was not implemented; <br /> • instead the borehole was continuously cored manually for lithologic and soil analytical <br /> comparison to the adjacent CPT/UVOST borings. Exploratory borings DP-23 through DP-30 <br /> were installed by Gregg Drilling using a CPT rig equipped with a UVOST tool for determination <br /> One Team. Infinite Solutions. <br /> TW Stockton SPH Assessment and UOU Pilot Test Report.FINAL.doc 3.1 <br />