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SEQUOIA ANALYTICAL <br />680 Chesapeake Drive • Redwood City, CA 94063 <br />NO(415) 364-9600 • FAX (415) 364-9233 <br />2134 Rheem Drive, Suite B Matrb(: Solid <br />Pleasanton, CA 94588 <br />Attention: John Lamb QC Sample Group: 3K66 <br />QUALITY CONTROL DATA REPORT <br />M <br />ANALYTE Benzene <br />Toluene Ethyl <br />Xylenes <br />11/15/93 <br />Benzene <br />GCHP-18 <br />Method: EPA =20 <br />EPA 8020 EPA SM <br />EP0. 8= <br />Analyst: E. Cunanan <br />E. Cunanan E. Cunanan <br />E. Cunanan <br />MS/MSD <br />Batch#: G31(34806 <br />Date Prepared: <br />11/13/93 <br />Date Analyzed: <br />11/15/93 <br />Instrument I.D.#: <br />GCHP-18 <br />Conc. Spiked: <br />0.20 mg/kg <br />G3K34806 G3K34806 G3K34806 <br />11/13/93 <br />11/13/93 <br />11/13/93 <br />11/15/93 <br />11/15/93 <br />11/15/93 <br />GCHP-18 <br />GCHP-18 <br />GCHP-18 <br />0.20 mg/kg <br />0.20 mg/kg <br />0.60 mg/kg <br />LCS Batch#: <br />Date Prepared: <br />Date Analyzed: <br />Instrument I.D.#: <br />LCS % <br />Recovery: <br />SEQUOIA ANALYTICAL <br />Vickie Tague <br />Project Manager <br />-lease Note: <br />The LCS is a control sample of known, interferent free matrix that is analyzed using the same reagents, <br />)reparation, and analytical methods employed for the samples. The matrix spike is an aliquot of sample <br />ortified with known quantities of specific compounds and subjected to the entire analytical procedure. If <br />he recovery of analytes from the matrix spike does not fall within specified control limits due to matrix <br />nterference, the LCS recovery is to be used to validate the batch. <br />3K66101.RES <3> <br />