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Sequoia 680 Chesapeake Drive Redwood City, CA 94063 (650) 364-9600 FAX (650) 364-9233 <br /> 404 N. Wiget lane Walnut Creek, CA 94598 (925) 988-9600 FAX (925) 988-9673 <br /> 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) 79Z- 1865 FAX (707) 792-0342 <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 ;1 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Phenol 2-Chlorophenol 1 ,4-Dichloro- N-Nitroso-Dl- 1 ,2,4-Trichloro- 4-Chloro-3- <br /> benzene N-propylamine benzene Methylphenol <br /> Prep- Method : EPA 3550 EPA 3550 EPA 3550 EPA 3550 EPA 3550 EPA 3550 <br /> Method : EPA 8270 EPA 8270 EPA 8270 EPA 8270 EPA 8270 EPA 8270 <br /> Analyst: L. Diaz L. Diaz L. Diaz L. Diaz L. Diaz L. Diaz <br /> MS/ MSD <br /> Batch#: BLK031299 BLK031299 BLK031299 BLK031299 BLK031299 BLK031299 <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/ 15/99 <br /> Instrument LD.#: GC/MS 1 GC/MS 1 GC/MS 1 GC/MS i GC/MS 1 GC/MS 1 <br /> Conc- Spiked : 5000 pg/kg 5000 pg/kg 3300pg/kg 3300 pg/kg 3300pg/kg 5000 pg/kg <br /> Matrix Spike <br /> % Recovery: 68 74 73 85 76 68 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery: 70 78 76 88 79 74 <br /> Relative % <br /> Difference: 2.9 5.3 4. 1 3.5 3.9 8.5 <br /> RPD Limit: 0-40 0-40 0-40 0-40 0-40 0-40 <br /> LCS Batch#: <br /> Date Prepared : <br /> Date Analyzed : <br /> Instrument I. D -#: <br /> LCS % <br /> Recovery: <br /> Recovery <br /> Control Limits: 26-90 25-102 28-104 41 -126 38- 107 26- 103 <br /> Please Note: <br /> SEQUOIA ANALYTICAL, #1271 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 /> Julianne Feginterference, the LCS recover is to be used to validate the batch . <br /> ley <br /> Project Manager Page 1 of 2 <br /> 9031116.GET < 34 > <br />