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ecology and environment, inc. <br /> International Specialists in the Environment <br /> 350 Sansome Street #300, _ <br /> San Francisco, California 94104 <br /> Tel: (415) 981-2811, Fax: (415) 981-0801 <br /> October 18, 1999 <br /> U.S. Environmental Protection Agency <br /> Emergency Response Office TDD: 09-9808-0005 <br /> 75 Hawthorne Street PAN: 0339-TTRZ-XX <br /> San Francisco, California 94105 <br /> Attention: Celeste Temple, Project Officer <br /> Subject: Report of Geology and Hydrogeology/Groundwater Sampling Analytical Results <br /> Tracy Tire Fire Site <br /> Latitude 37°41' 12"N, Longitude 121°25' 21"W <br /> INTRODUCTION <br /> On July 8 1999, U.S. Environmental Protection Agency (EPA) On-Scene Coordinator (OSC) <br /> Donn Zuroski tasked the Ecology and Environment, Inc., Superfund Technical Assessment and <br /> Response Team (START) to complete a report of the geology and hydrogeology at the Tracy Tire <br /> Fire site in Tracy, San Joaquin County, California. <br /> The START acquired and reviewed the documents listed in Attachment A to develop the local <br /> and regional geology/hydrogeology. In addition, the START, with the assistance of the U.S. <br /> Coast Guard and the California EPA Integrated Waste Management Board (IWMB), mobilized <br /> to the site on August 20, 1999 and collected soil samples for lithologic logging and geotechnical <br /> laboratory analysis. <br /> The START was also tasked with presenting the laboratory analytical results of two previous <br /> groundwater sampling events. On August 14, 1998, the groundwater of two industrial wells and <br /> one domestic well located in the vicinity of the site was sampled by the START and analyzed by <br /> a laboratory for contaminants of concern. On March 12, 1999, the groundwater of the three wells <br /> was re-sampled by the START. Additional groundwater samples were collected at a second <br /> residence where persons expressed concerns regarding their water quality. <br /> 1:\000610\SM 89_0339TTRZXXUTTzur30.799.wpd <br /> 10/18/99 8:34 AM <br />