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SEQUOIA ANALYTICAL <br />680 Chesapeake Drive • Redwood City, CA 94063 <br />(415) 364-9600 • FAX (415) 364-9233 <br />2134 Rheem Drive, Suite B Matra: Solid <br />Pleasanton, CA 94588 <br />Attention: John Lamb QC Sample Group: 3K66 <br />QUALITY CONTROL DATA REPORT <br />Nov <br />ANALYTE <br />Benzene <br />Toluene <br />Ethyl <br />Xylenes <br />Balch#: <br />G31<34806 <br />G3K34806 <br />Benzene <br />G3K34806 <br />Method: <br />EPA^020 <br />EPA 8020 <br />EPA 5020 <br />EPA 8020 <br />Analyst: <br />E. Cunanan <br />E. Cunanan <br />E. Cunanan <br />E. Cunanan <br />MS/MSD <br />Balch#: <br />G31<34806 <br />G3K34806 <br />G31<34806 <br />G3K34806 <br />Date Prepared: <br />11/13/93 <br />11/13/93 <br />11/13/93 <br />11/13/93 <br />Date Analyzed: <br />11/15/93 <br />11/15/93 <br />11/15/93 <br />11/15/93 <br />Instrument I.D.#: <br />GCHP-18 <br />GCHP-18 <br />GCHP-18 <br />GCHP-18 <br />Conc. Spiked: <br />0.20 mg/kg <br />0.20 mg/kg <br />0.20 mg/kg <br />0.60 mg/kg <br />Matrix Spike <br />% Recovery: <br />85 <br />85 <br />90 <br />87 <br />Matrix Spike <br />Duplicate % <br />Recovery: <br />85 <br />90 <br />90 <br />88 <br />Relative % <br />Difference: <br />0.0 <br />5.7 <br />0.0 <br />1.1 <br /><.>zrmC'e`QT;•.y'V:y:ry:r,..,,,;.; �.,.,.�� ,reb::�p.a 'on`.M'\vn: Y6;.'� rpxx'g' <br />b?O)xx. <br />..ra':. <br />..(! a .:.... ... <br />,..,.,..�....., L <br />..... v >x. .. <br />MON. <br />,. A .. 'y:U' <br />LCS Balch#: - - <br />Date Prepared: <br />Date Analyzed: <br />Instrument I.D.#: <br />LCS % <br />Recovery: <br />Control Limits: 71-133 <br />SEQUOIA ANALYTICAL <br />Vickie Tague <br />Project Manager <br />Please Note: <br />The LCS is a control sample of known, interferent free matrix that is analyzed using the same reagents, <br />preparation, and analytical methods employed for the samples. The matrix spike is an aliquot of sample <br />fortified with known quantities of specific compounds and subjected to the entire analytical procedure. If <br />the recovery of 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 />3K66101.RES <3> <br />