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i <br /> i <br /> t <br /> groundwater data will be required. B&R believes that at least one monitoring <br /> well should be installed within or near the former tank area and one within the <br /> former dispenser area, to monitor trends in water quality in these areas where <br /> PHC concentrations are likely to be highest. <br /> 6.0 REFERENCES . <br /> Bartow, J. Alan and Tor H. Nilsen, 1990, "Review of the Great Valley Sequence, Eastern <br /> Diablo Range and Northern San Joaquin Valley, Central California," USGS Open File <br /> Report 90-226. <br /> Boyajian and Ross Inc., 1998, "Work Plan for Initial Subsurface Investigation for Petroleum <br /> Hydrocarbons, Site No. 5 (Site Code 1237)," June 30, 1998. <br /> Central Valley Regional Water Quality Control Board, 1991, "Appendix A To Tri-Regional <br /> Recommendations —'Reporting," August 30, 1991. <br /> EMCON, 1998, "Fourth Quarter 1997 Groundwater Monitoring Report, Port of Stockton," <br /> report prepared for Stockton Terminals Technical Committee, March 27, 1998. <br /> North Coast, San Francisco Bay, and Central Valley Regional Water Quality Control Boards, <br /> 1990, "Tri-Regional Board Staff Recommendations for Preliminary Investigation and <br /> Evaluation of Underground Tank Sites," August 10, 1990.. <br /> Sierra-Pacific Groundwater Consultants, Inc., 1994, "Results of Soil Investigation at 2130 <br /> West Washington Street Facility, Stockton, California," report prepared for Unocal <br /> Corporation, Figure 11, Cross Section Between Borings P-38 and P-46. May 11, 1994. <br /> L1998, "First Semi-Annual 1998 Monitoring Report and Request for Regulatory <br /> Closure, Former PureGro Molasses Feed Product Facility, 2130 West Washington <br /> Street, Stockton," April 17, 1998. <br /> L <br /> 9 98117UffVRPL WUS1'WV,R" <br /> BOYAJIAN & ROSS, INC. <br /> Environmental Scientists & Engineers <br /> t <br />