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1 <br /> ' DATA VALIDATION SUMMARY <br /> LFR performed a level III data validation evaluation of the analytical data collected <br /> ' during June 2006 at the Tracy Tire Fire Site. The data validation evaluation was <br /> conducted in accordance with the United States Environmental Protection Agency <br /> (U.S. EPA) Data Validation Functional Guidelines for Evaluating Environmental <br /> ' Analyses, "U.S. EPA Contract Laboratory Program National Functional Guidelines <br /> for Organic Data Review," dated October 1999, and "U.S. EPA Contract Laboratory <br /> Program National Functional Guidelines for Inorganic Data Review," dated February <br /> 1994 ("the U.S. EPA Guidance"). The following is a summary of the evaluation of <br /> analytical data for groundwater samples collected for the groundwater monitoring <br /> events at the Site. The sampling events occurred on June 1 and 23, 2006. Groundwater <br /> ' samples were submitted to Curtis & Tompkins, Ltd., located in Berkeley, California. <br /> The Curtis & Tompkins, Ltd. sample delivery group (SDG) evaluated for this report <br /> was 182286. Groundwater samples were collected for analysis using the following <br /> EPA methods: <br /> Groundwater samples collected on June 1, 2006 were analyzed for the following <br /> ' pyrolytic oil constituents: <br /> • volatile organic compounds (VOCs) by EPA Method 8260B <br /> ' • semivolatile organic compounds (SVOCs) by EPA Method 8270C <br /> • diesel-range (C10-C24) hydrocarbons and motor oil-range (C24-C36) hydrocarbons <br /> ' by EPA Method 8015M <br /> Groundwater samples collected on June 23, 2006 were analyzed for the following <br /> ' metals and pyrolytic oil constituents: <br /> total concentrations of Title 22 metals: antimony, arsenic, barium, beryllium, <br /> ' cadmium, chromium, cobalt, copper, lead, mercury, molybdenum, nickel, <br /> selenium, silver, thallium, vanadium, and zinc by EPA Method 6010 and mercury <br /> by EPA Method 7471A <br /> ' diesel-range hydrocarbons and motor oil-range hydrocarbons by EPA Method <br /> 8015M (MW-8 only) <br /> ' The data were evaluated based on the following parameters according to the U.S. EPA <br /> Guidance for Level III data validation: <br /> ' data completeness <br /> • holding times <br /> ' blanks <br /> • system monitoring compound spike recoveries (surrogates) <br /> • matrix spike/matrix spike duplicate recoveries (MS/MSD) <br /> 1 <br /> 1 <br />