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LFR Inc. <br /> at the Tracy Tire Fire Site, Former Royster Tire Disposal Facility, Tracy, California," <br /> dated May 6, 2003 (the "May 2003 Work Plan") on behalf of the CIWMB for <br /> submittal to the RWQCB. The May <br /> 2003 Work Plan was approved by K <br /> the RWQCB in a letter dated May 5, <br /> 2003, to the DTSC and the CIWMB. F <br /> The May 2003 Work Plan presently .•F <br /> methods and procedures for I� <br /> installing groundwater monitoring <br /> wells to be used for conducting <br /> quarterly groundwater monitoring <br /> and reporting. The quarterly <br /> groundwater sampling plan was <br /> designed to establish trends in the <br /> concentrations of chemicals in <br /> groundwater and to assess potential <br /> impacts to groundwater associated Photograph 12 <br /> with the tire fire at the Site. Figure 3 Excavation progress and dust control <br /> shows the locations of the site measures during June 2004 <br /> monitoring wells and soil borings. <br /> 5.5.1 Monitoring Wells MW-1 through MW-5 <br /> The U.S. EPA provided direction to EEI for the installation of wells MW-1 through <br /> MW-4 during 2002. Based on data collected from the four on-site groundwater <br /> monitoring wells during October 2002, groundwater flow within the upper water- <br /> bearing unit was estimated to flow toward the northwest, with a calculated horizontal <br /> gradient of 0.001 ft/ft (EEI 2002). Based on this flow direction, and the orientation of <br /> existing monitoring wells at the Site, an additional groundwater well (MW-5) was <br /> needed to provide groundwater-quality data downgradient from the Site. <br /> On March 23, 2003, groundwater monitoring well (MW-5) was installed and was <br /> sampled on April 14, 2003. Details regarding well MW-5 installation and sampling <br /> results were provided in the "Combined Well Installation Report and Second Quarter <br /> 2003 Quarterly Monitoring Report, Tracy Tire Fire Site," prepared by LFR and dated <br /> July 29, 2003. <br /> Groundwater monitoring and sampling of wells MW-1 through MW-5 began during the <br /> second quarter of 2003 and was conducted quarterly through the second quarter of <br /> 2005. LFR personnel measured depth to groundwater, purged each well, monitored <br /> and recorded groundwater parameters, and collected groundwater samples. The <br /> samples were submitted to a state-certified analytical laboratory for chemical analysis <br /> of the following analytes: <br /> Page 26 rpt-RA_summ-Nov06-final-09025:FNC <br />