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Ali <br /> N / \ 680 Chesapeake Drive Redwood City, CA 94063 (650) 364-9600 FAX (650) 364-9233 <br /> Sequoia <br /> 404 N. Witter Lane Walnut Creek, CA 94598 (925) 988-9600 FAX (925) 988-9673 <br /> r1/e _Analytical 819 Striker Avenue, Suite 8 Sacramento, CA 95834 (916) 921 -9600 FAX (916) 921 - 0100 <br /> 1455 McDowell Blvd. North, Ste. D Petaluma, CA 94954 (707) 792- 1865 FAX (707) 792-0341 <br /> r .. . . .. , <br /> Gettler-Ryan - Dublin Client Project ID . Chevron #9 3232, Stockton <br /> 6747 Sierra Court, Suite J Matrix: Solid <br /> Dublin, CA 94568 <br /> Attention: Greg Gurss QC Sample Group: 9031116-129 Reported : Mar 16, 1999 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE 1 , 1 -Dichloroethene Trichloroethene Benzene Toluene Chloro- MTBE <br /> benzene <br /> Method : EPA 8240 EPA 8240 EPA 8240 EPA 8240 EPA 8240 EPA 8260 <br /> Analyst: N. Nelson N. Nelson N. Nelson N. Nelson N. Nelson N. Nelson <br /> MS/MSD <br /> Batch# : 9031125 9031125 9031125 9031125 9031125 9031116 <br /> Date Prepared : 3/ 12/99 3/12/99 3/ 12/99 3/12/99 3/12/99 3/121199 <br /> Date Analyzed : 3/15/99 3/15/99 3/15/99 3/ 15/99 3/15/99 3/ 15/99 <br /> Instrument LD .#: GC/MS 2 GC/MS 2 GC/MS 2 GC/MS 2 GC/MS 2 GC/MS-2 <br /> Conc, Spiked : 2500 pg/kg 2500 pg/kg 2500 pg/kg 2500 pg/kg 2500 pg/kg 2500 pg/kg <br /> Matrix Spike <br /> % Recovery: 72 96 100 96 96 92 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery: 76 100 104 104 100 104 <br /> Relative % <br /> Difference: 5.4 4. 1 3.9 8.0 4. 1 12 <br /> LCS Batch# : LCS031299B LCS031299B LCS031299B LCS031299B LCS0312996 LCS031299B <br /> Date Prepared : 3/12/99 3/12/99 3/12/99 3/12/99 3/12/99 3/12/99 <br /> Date Analyzed : 3/15/99 3/15/99 3/15/99 3/15/99 3/15/99 3/12/99 <br /> Instrument I . D .#: GC/MS 2 GC/MS 2 GC/MS 2 GC/MS 2 GC/MS 2 GC/103-2 <br /> LCS % <br /> Recovery: 68 100 104 104 100 92 <br /> Recovery <br /> Control Limits: 65-135 70-130 70-130 70.130 70-130 70-130 <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, # 1271 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 /> 44AIt4 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 /> rhanneroject FegleyeManag <br /> 9031116.GET < 32 > <br />