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' LFR Inc. <br /> ' Results for laboratory control samples, matrix spikes, and matrix spike duplicates are <br /> within the accepted QA/QC criteria. <br /> ' One duplicate groundwater sample pair was collected during each day of the sampling <br /> event: on June 1, 2006, duplicate DUP-01 and its primary sample (MW-07) were <br /> ' collected and analyzed for diesel-range hydrocarbons, motor oil-range hydrocarbons, <br /> VOCs, and SVOCs. In addition, on June 23, 2006, duplicate DUP-01 and its primary <br /> sample (MW-8) were collected and analyzed for diesel range hydrocarbons, motor oil- <br /> range hydrocarbons, and metals. The duplicates were submitted to the laboratory as <br /> part of standard field quality assurance/quality control procedures. <br /> ' Analytical results for the duplicate groundwater sample collected on June 1, 2006 <br /> indicated that reported concentrations were generally consistent with analytical results <br /> for the primary groundwater sample collected from MW-7 with the exception of TPHd <br /> ' as shown in Table 2. <br /> ' Analytical results for duplicate groundwater sample collected on June 23, 2006 <br /> indicated that the RPD between the primary and duplicate samples collected from well <br /> MW-8 for TPHd, and TPHmo exceeded the EPA criteria, as shown in Table 2. <br /> Per EPA protocol, aqueous duplicate samples should be within 30 percent relative <br /> percent difference (RPD). Based on the analytical results between the duplicate and <br /> ' primary samples, four results were out of compliance and were qualified as estimated <br /> concentrations. The qualified data are presented in Table 2. No other data were <br /> qualified based on the data validation review. <br /> Table 2 <br /> Qualified Results for Groundwater Samples <br /> Trac Tire Fire Site <br /> Well ID Sample Analyte Primary Duplicate Units RPD <br /> Date Result Result <br /> Diesel-range 150 110 ug/l 31% <br /> MW-7 6-01-06 h drocarbons <br /> Diesel-range 1,100 650 µg/l 51% <br /> ' <br /> MW-8 6-23-06 hydrocarbons <br /> oil-range <br /> 490 <280 Pg/1 55% <br /> hydrocarbons <br /> ' 5.0 MONITORING AND SAMPLING RESULTS <br /> ' The following sections describe the groundwater gradient and flow direction and <br /> groundwater analytical results. <br /> ' Finai_ow Mon Rpt June 2006.doc:LFR Page 5 <br />