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� REFERENCES <br /> California Regional Water Quality Control Soard, 1990, Tri-Regional Board Staff <br /> Recommendations for Preliminary Evaluation and Investigation of Underground Tank <br /> Sites. <br /> Kieinfelder, November 17. ,989, Soil and Groundwater Assessment, East BayMuniclpal <br /> Utility District. <br /> Connor,.1.J.and Shackiette,H.7.,1975, Background Geoche lstty t S Se Roc !, F1elld <br /> Plants and Vegetables In the Coterminous United States, <br /> aeochem Wry, U.S. Geological Survey Professional Paper 574-F. <br /> 4. <br /> r^• <br /> i� - 17 - <br />