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SEQUOIA ANALYTICAL <br /> 680 Chesapeake Drive • Redwood City,CA 94063 <br /> (415) 364-9600 FAX(415) 364-9233 <br /> RESNA Gient Project ID: 150053.02, Stone Bros. <br /> 1710 Main Street Matrix: Soil <br /> Escalon, CA 95320 <br /> ;:'Attention: Greg QC Sample Group: 4A38201-2 1994 < <br /> .._ <br /> ....................... ::,...-.:::::::::::.::::........... <br /> Reported: an 12, <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Benzene Toluene Ethyl xylenes <br /> Benzene <br /> Method: EPA 8020 EPA 6020 EPA 8020 EPA 8020 <br /> Analyst: E.Cunanan E.Cunanan E.Cunanan E.Cunanan <br /> MS/MSD <br /> Batch#: 4A29301 4A29301 4A29301 4A29301 <br /> Date Prepared: 1/11/94 1/11/94 1/11/94 1/11/94 <br /> Date Analyzed: 1/11/94 1/11/94 1/11/94 1/11/94 <br /> Instrument I.D.#: GCHP-6 GCHP-6 GCHP-6 GCHP-6 <br /> Conc.Spiked: 0.20 mg/kg 0.20 mg/kg 0.20 mg/kg 0.60 mg/kg <br /> Matrix Spike <br /> %Recovery: 80 85 85 85 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery: ss 85 85 87 <br /> Relative% <br /> Difference: 6.1 0.0 0.0 2.3 <br /> LCIS Batch#: - - <br /> Date Prepared: <br /> Date Analyzed: <br /> Instrument I.D.#: <br /> LCS% <br /> Recovery: - _ <br /> Recovery <br /> Control Limits: 55-145 47-149 47-155 56.140 <br /> Please Note: <br /> The LCS is a control sample of known,interferent free matrix that is analyzed using the same reagents, <br /> SEQUOIA ANALYTICAL preparation,and analytical methods employed for the samples. The matrix spike is an aliquot of sample <br /> inn^ <br /> fortified with known quantities of specific compounds and subjected to the entire analytical procedure. M <br /> '�y fi { the recovery o1 analytes from the matrix spike does not fall within specified control limits due to matrix <br /> ! interference,the LCS recovery is to be used to validate the batch. <br /> Vickie Tagde <br /> Project Manager 4A38201.WAT <2> <br />