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Work Plan for Preliminary Subsurface Investigation January 31, 1992 <br /> City of Stockton, former Western Pacific Railroad Property, Stockton, CA W0601.1B <br /> in accordance with San Joaquin County and California Department of Water Resources <br /> guidelines. To protect the integrity of the well, a locking, water-tight well plug will be installed <br /> on the well and locking steel well monument will be concreted over the well. <br /> After installation, the wellheads will be surveyed vertically and horizontally to a common datum <br /> by a registered surveyor to provide accurate well locations. The well locations will be plotted <br /> on a map, provided by the City, to show the relationship between the location of the wells and <br /> the selected redevelopment option. Depth-to-water readings will be used to determine the <br /> groundwater flow direction beneath the project site. <br /> 6.0 GROUNDWATER SAMPLING AND ANALYSIS METHODS <br /> After the three monitoring wells have been installed, they will be properly developed and <br /> monitored in accordance with the site Groundwater Monitoring Protocol (Appendix A). Water <br /> samples will then be'collected after purging a minimum of three well volumes (casing and <br /> sandpack). The criteria for determining well volumes are included in Appendix A. Sample <br /> collection will be performed in accordance with the site Groundwater Sampling Protocol <br /> (Appendix A). The water samples will be analyzed by RESNA Environmental Laboratories for <br /> California Title 22 Metals, Volatile Organics (EPA method 8240), Semi-Volatile Organics (EPA <br /> method 8270). Groundwater sampling protocol including sample containers, holding times, <br /> means of preservation, and chain-of-custody documentation are summarized in Appendix A. <br /> The development and purge water will be stored on site in drums approved for hazardous waste <br /> storage until laboratory results are received. At this time, disposal and/or treatment options will <br /> be evaluated. All site activities involving potential contact with hazardous materials associated <br /> with this investigation will be conducted in accordance with the site Health and Safety plan <br /> (Appendix B). <br /> WP013192.SAY 5 <br />