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Sequoia 680 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 /> X117 Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> 141chstone Development Client Project ID Chevron #9-2033 <br /> P O Box 2554 Matrix Solid <br /> Santa Rosa, CA 95405 <br /> Attention Jeff Monroe QC Sample Group 6090437-444 Reported Oct 1, 1996 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Phenol 2 Chlorophenol 1,4-Dichtoro N-Nitroso-Di- 1,2,4-Trichloro 4-Chloro 3 <br /> benzene N-propylamme benzene Methylphenol <br /> QC Batch# MS091096 MS091096 MS091096 MS091096 MS091096 MS091096 <br /> 8270EXA 8270EXA 8270EXA 8270EXA 8270EXA 8270EXA <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 B Pitamah B Pitamah B Pitamah B Pitamah B Pitamah B Pitamah <br /> MS/MSD # 96081-163-01 960BH63-01 9608H63-01 96081-163-01 960BH63-01 9608H63-01 <br /> Sample Conc N D N D N D N D N D N D <br /> Prepared Date 9/10/96 9/10/96 9/10/96 9/10/96 9/10/96 9/10/96 <br /> Analyzed Date 9/12/96 9/12/96 9/12/96 9/12/96 9/12/96 9/12/96 <br /> Instrument I D # F-4 F-4 F-4 F4 F4 F4 <br /> Conc Spiked 3300ug/kg 3300 ug/kg 3300ug/kg 3300ug/kg 3300 ug/kg 3300 ug/kg <br /> Result 2700 2500 1200 2200 2000 2000 <br /> MS % Recovery 82 76 36 67 61 61 <br /> MDup Result 2900 2800 1600 2400 2300 2200 <br /> D % Recov 88 85 48 73 70 67 <br /> RPD 71 11 29 87 14 95 <br /> RPD Limit 0-40 0-40 0-40 0-40 0-40 0-40 <br /> LCS # SB091OBS SB091OBS SS091OBS SBO91OBS SBO91OBS SBO91OBS <br /> Prepared Date 9/10/96 9/10/96 9/10/96 9/10/96 9/10/96 9/10/96 <br /> Analyzed Date 9/12/96 9/12/96 9/12/96 9/12/96 9/12/96 9/12/96 <br /> Instrument I D # F-4 F-4 F-4 F-4 F-4 F-4 <br /> Conc Spiked 3300ug/kg 3300 ug/kg 3300ug/kg 3300 ug/kg 3300ug/kg 3300 ug/kg <br /> LCS Result 2700 2600 1700 2700 2200 2700 <br /> LCS % Recov 82 79 52 82 67 82 <br /> LCS 26-90 25-102 28-104 41-126 38-107 26-103 <br /> Control Limits <br /> Please Note <br /> 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 /> SEQUOIA ANALYTICAL, #1210 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 /> terference the LCS recove ss to be used to validate the batch <br /> ** <br /> Melissa A Brewer MS=Matrix Spike, MSD=MS Duplicate, RPD=Relative% Difference <br /> Client Services Representative Page 1 of 2 <br /> 6090441 TOU <18> <br />