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QA/QC DATA REVIEW SUMMARY <br /> 1 0 QA/QC NARRATIVE <br /> Site NCS Stockton (CTO 0162) <br /> Laboratory ChemWest Analvtical Laboratories <br /> ' QA Reviewer Ron Ohta, PRC <br /> Review Date June 26 1992 <br /> ' SDG No 9501 and 9517 <br /> Sample No NCS-3, NCS-4, NCS-5 <br /> ' Collection Dates April 20, 1992 and April 24, 1992 <br /> Analvses TPH Gasoline with Benzene, Toluene, EthN lbenene and Xvlenes (BTEY) <br /> ' Ethvlene Dibromide (EDB), Total Lead, Organic Lead, and Volatile <br /> Aromatic Compounds <br /> QC Criteria Reviewed Holding times, laboratory blanks surrogate recoveries matri,, <br /> ' spike/matrix spike duplicate, and blank spikes <br /> The data were reviewed according to EPA documents °Laboratory Data Validation Functional <br /> Guidelines for Evaluating Organic Analyses" (February 1988) and "Laboratory Data Validation <br /> Functional Guidelines for Evaluating Inorganic Analvses" (July 1988) <br /> ' Comments <br /> 1 Due to holding time problems, the following non-detected analytes are considered <br /> ' estimated (UJ) and usable for limited purposes only <br /> • Organic lead in sample NCS-3 and NCS-4 <br /> ' Samples NCS-3 and NCS-4 were analyzed 4 days past the 14 daN holding time The DHS <br /> LUFT method for organic lead does not specify a holding time however, the 14 d-i% <br /> holding time for volatile organics was applied <br /> 1 2 No data were qualified due to blank contamination problems The method blank for <br /> aromatic volatiles (AVBLKOI) contained 003 mg/kg of 1,4 dichlorobenzene, however <br /> ' this compound was not detected in the sample No further action was necessary <br /> 3 No data were qualified due to surrogate recovery problems The surrogate reco"eries for <br /> ' o-chlorotoluene were 8% and 3 8% for samples NCS-3 and NCS-4 respectively Ho"ever <br /> the recoveries for bromochloromethane were within the acceptance criteria of 50-150"„ <br /> Also, since the matrix spike/matrix spike duplicate (MS/MSD) results and blank spike <br /> analyses were all well within acceptance criteria, no qualifiers were fudged to be <br /> ' necessary <br /> 95019517162 <br /> 1 <br />