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j SEQUOIA ANALYTICAL <br />680 Chesapeake Drive - Redwood City, CA 94063 <br />(415) 364-9600 • FAX (415) 364-9233 <br />,c.F lam:•.11 <br />RESNA n " `J - alert Project }ID n 150054 01, Corrigan Property Y yA n n <br />11710 Main Street Matra Solid <br />-Escalon, CA 95320 <br />Attention John Lane QC Sample Group 31-60001-30 Reported Dec 27, 1993 <br />QUALITY CONTROL DATA REPORT <br />ANALYTE Benzene <br />Toluene Ethyl Xylenes <br />12/21/93 <br />Benzene <br />Method- EPA 8020 <br />EPA 8020 EPA 8020 EPA 8020 <br />Analyst: A Tuzon <br />A Tuzon A. Tuzon A Tuzon <br />MS/MSD <br />Batch#: 3120812 3120812 3120812 3120812 <br />Date Prepared. <br />12/21/93 <br />12/21/93 <br />12/21/93 <br />12/21/93 <br />Date Analyzed. <br />12/21/93 <br />12/21/93 <br />12/21/93 <br />12/21/93 <br />Instrument I.D.#: <br />GCHP-4 <br />GCHP-4 <br />GCHP-4 <br />GCHP-4 <br />Conc. Spiked- <br />20 mg/kg <br />20 mg/kg <br />20 mg/kg <br />60 mg/kg <br />Matrix Spike <br />% Recovery: <br />85 <br />95 <br />95 <br />93 <br />Matrix Spike <br />Duplicate % <br />Recovery. <br />90 <br />95 <br />100 <br />98 <br />Relative % <br />Difference. <br />57 <br />00 <br />51 <br />52 <br />LCS Batch#: <br />LCS122193 <br />LCS122193 <br />LCS122193 <br />LCS122193 <br />Date Prepared. 12/21/93 <br />Date Analyzed: 12/21/93 <br />Instrument I.D #: GCHP-4 <br />LCS % <br />Recovery- 97 <br />12/21/93 <br />12/21/93 <br />12/21/93 <br />12/21/93 <br />12/21/93 <br />12/21/93 <br />GCHP-4 <br />GCHP-4 <br />GCHP-4 <br />104 <br />106 <br />106 <br />% Recovery <br />Control Limits. 71-133 72-128 72-130 71-120 <br />SEQUOIA ANALYTICAL <br />Vickie Tag e <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 />;rtrfied with known quantities of specific compounds and subjected to the entire analytical procedure N <br />ie recovery of analytes from the matrix spike does not fail within specified control limits due to matrix <br />derference, the LCS recovery is to be used to validate the batch <br />31-60001 WAT a6> <br />