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' Sequoia 680 Chesapeake Drive Redwood City, CA 94063 (650) 364-9600 FAX (650) 364-9233 <br /> 404 N. WISet 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 /> q1W1455 McDowell Blvd. North, Ste, D Petaluma, CA 94954 (707) 792- 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 /> i` Dublin, CA 94568 <br /> Attention: Greg Gurss QC Sample Group: 9031116-129 Reported : Mar 16, 1999 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Cadmium Chromium Copper Nickel Lead Zinc Arsenic <br /> Method : EPA 6010 EPA 6010 EPA 6010 EPA 6010 EPA 6010 EPA 6010 EPA 6010 <br /> Analyst: J. Kelly J. Kelly J. Kelly J. Kelly J. Kelly J. Kelly J. Kelly <br /> MS/MSD <br /> Batch#: 9030973 9030973 9030973 9030973 9030973 9030973 9030973 <br /> Date Prepared : 3/ 12/99 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 3/15/99 <br /> Instrument LD. #: MV-4 MV-4 MV-4 MV-4 MV-4 MV-4 MV-4 <br /> Cone, Spiked : 50 mg/kg 50 mg/kg 50 mg/kg 50 mg/kg 50 mg/kg 50 mg/kg 50 mg/kg <br /> Matrix Spike <br /> % Recovery: 98 110 120 124 106 132 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery: 98 110 100 104 100 92 <br /> Relative % <br /> Difference: 0.0 0.0 8.0 7.4 3.7 13 0.0 <br /> NN X <br /> LCS Batch#: LCS031299 LCS031299 LCS031299 LCS031299 LCS031299 LCS031299 LCS031299 <br /> Date Prepared : 3/12/99 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 3/15/99 <br /> Instrument I.D.# : MV-4 MV-4 MV-4 MV-4 MV-4 MV-4 MV-4 <br /> LCS % <br /> Recovery: 104 108 110 108 98 104 104 <br /> Recovery <br /> Control Limits : 80-120 80-120 80-120 80-120 80-120 80-120 80-120 <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 /> �c/ �< v (/ 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 recoveryIs to be used to validate the batch , i <br /> JKU'll/anne Fegley " High Iron concentration in sample interferred with spike recovery. <br /> Project Manager <br /> 9031116.GET <36 > <br />