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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 /> 4.0 GROUNDWATER COLLECTION TRENCH AND PUMPING TEST <br /> FINDINGS <br /> This section of the report presents the installation of two groundwater collection trench <br /> extraction wells (GWE-1 and GWE-2) on the adjacent UOU between August 5 and August 6, <br /> 2010, and a discussion of the results of the pumping test, and system feasibility study <br /> conducted using those wells on November 15 through November 19, 2010. As discussed <br /> above, the SRDA has assumed responsibility for the investigation and remediation of the UOU. <br /> At the request of CRWQCB-CVR staff, the L&M OU Group agreed to evaluate the feasibility of <br /> using the remedial technologies currently in place at the L&M OU to remediate impacted <br /> groundwater beneath the UOU. However, the L&M OU Group has not agreed to implement <br /> such remedial technologies at the UOU. As discussed above, the SRDA has assumed legal <br /> responsibility for remediating the UOU. The well installations, pumping test and system <br /> feasibility study were performed in general accordance with Stantec's Work Plan for Additional <br /> Separate Phase Hydrocarbon Assessment, Unocal Groundwater Recovery Well Installation, <br /> and Remedial System Feasibility Study submitted on March 5, 2010. The results of the pump <br /> • test and feasibility study were used to develop and present a conceptual design for active <br /> remediation and treatment employing GWE-1 and GWE-2 as extraction points. <br /> 4.1.1 Site Health and Safety Plan <br /> As required by the Occupational Health and Safety Administration (OSHA) Standard <br /> "Hazardous Waste Operations and Emergency Response" guidelines (29 CFR 1910.120), and <br /> by California Occupational Health and Safety Administration (Cal-OSHA) "Hazardous Waste <br /> Operations and Emergency Response" guidelines (CCR Title 8, Section 5192), a site-specific <br /> Health and Safety Plan (HASP) was prepared. Prior to the commencement of fieldwork, the <br /> HASP was updated with appropriate field personnel and subcontractor information. The field <br /> staff and contractors reviewed the HASP before beginning field operations at the Site. <br /> 4.1.2 Access and Permitting <br /> Prior to the initiation of field work, access agreements between the L&M OU and the SRDA <br /> were obtained. Prior to drilling, well construction permits were obtained from the SJCEHD. <br /> Copies of the permits are provided in Appendix C. In addition, Applicable permits were obtained <br /> from the SJVAPCD prior to initiating field efforts. <br /> Extracted groundwater collected during field activities was collected and stored temporarily in a <br /> double contained, above ground Baker Tank. Grab samples were collected and submitted to <br /> the laboratory for waste water profiling prior to being treated through the current onsite <br /> remediation system and discharged into the sanitary sewer under the current wastewater <br /> 40 discharge permit issued on July 1, 2009 for the Site. <br /> 4.4 <br />