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Sequoia680 Chesapeake Drive Redwood City CA 94063 (415) 364 9600 FAX (415) 364 9233 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX (510) 988 9673 <br /> G)l Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX (916) 921 0100 <br /> VWV <br /> touchstone Development Client Project 1D Chevron #9-2033 <br /> P O Box 2554 Matrix Solid <br /> Santa Rosa, CA 95405 <br /> Attention Jeff Monroe OC Sample Group 7030207 Reported Mar 13, 1997 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Phenol 2-Chlorophenol 1,4-Dchloro N-Nitroso Di- 1,2,4-Tnchloro 4-Chloro-3 <br /> benzene N-propylamine benzene Methylphenol <br /> QC Batch# SP030797 SP030797 SP030797 SP030797 SP030797 SP030797 <br /> 8270EXA 8270EXA 8270EXA 8270EXA 8270EXA 6270EXA <br /> Analy Method EPA 8270 EPA 8270 EPA 8270 EPA 8270 EPA 8270 EPA 8270 <br /> Prep Method EPA 3550 EPA 3550 EPA 3550 EPA 3550 EPA 3550 EPA 3550 <br /> Analyst I Dalvand I Dalvand I Dalvand I Dalvand I Dalvand I Dalvand <br /> MS/MSD # 7030207 7030207 7030207 7030207 7030207 7030207 <br /> Sample Conc N D N D N D N D N D N D <br /> Prepared Date 3/7/97 3/7/97 3/7/97 3/7/97 3/7/97 3/7/97 <br /> Analyzed Date 3/12/97 3/12/97 3/12/97 3/12/97 3/12/97 3/12/97 <br /> Instrument I D # GC/MS-1 GC/MS-1 GC/MS-1 GC/MS 1 GC/MS 1 GC/MS 1 <br /> Conc Spiked 5000 pg/kg 5000 jig/kg 2500pg/kg 2500 Vg/kg 2500 pg/kg 5000 fig/kg <br /> Result 3500 3200 1500 1700 1500 3500 <br /> MS % Recovery 70 64 58 68 60 69 <br /> 0Dup Result 5000 4700 2000 2500 2300 5200 <br /> MSD % Recov 100 94 80 98 90 103 <br /> RPD 35 38 32 36 40 40 <br /> RPD Limit 040 0-40 0-40 040 040 040 <br /> LCS # LCS030797 LCS030797 LCS030797 LCS030797 LCS030797 LC8030797 <br /> Prepared Date 3/7/97 3/7/97 3/7/97 3/7/97 3/7/97 3/7/97 <br /> Analyzed Date 3/12/97 3/12/97 3/12/97 3/12/97 3/12/97 3/12/97 <br /> Instrument I D # GC/MS-1 GC/MS-1 GC/MS 1 GC/MS-1 GC/MS 1 GC/MS-1 <br /> Conc Spiked 5000 ug/kg 5000 pg/kg 2500 pg/kg 2500 ug/kg 2500 pg/kg 5000 pg/kg <br /> LCS Result 4600 4600 2200 2100 2100 4400 <br /> LCS % Recov 92 92 86 84 84 87 <br /> LCS 2690 25-102 28-104 41-126 38-107 26-103 <br /> Control Limits <br /> Please Note <br /> The LCS 1s 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 /> SEQUOIA ANALYTICAL, #1271 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 /> 44L��ia- terference the LCS recover is to be used to validate the batch <br /> **MS=Matrix Spike MSD=MS Duplicate, RPD=Relative %Difference <br /> Melissa A Brewer <br /> Client Services Representative Page 1 of 2 <br /> 7030207 TOU a 11> <br />