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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 /> Analytical 819 Striker Avenue,Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> .0chstone 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 Acenaphthene 4-Nitrophenol 2,4-Dinitro- Pentachloro- Pyrene <br /> toluene phenol <br /> QC Batch# MS091096 MS091096 MS091096 MS091096 MS091096 <br /> 8270EXA 8270EXA 8270EXA 8270EXA 8270EXA <br /> Analy Method EPA 8270 EPA 8270 EPA 8270 EPA 8270 EPA 8270 <br /> Prep Method EPA 3550 EPA 3550 EPA 3550 EPA 3550 EPA 3550 <br /> Analyst B Pitamah B Pitamah B Pitamah B Pitamah B Pitamah <br /> MS/MSD # 96081163-01 96081163 01 9608H63-01 96081163-01 960BH63-01 <br /> Sample Conc 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 <br /> Analyzed Date 9/12/96 9/12/96 9/12/96 9/12/96 9/12/96 <br /> Instrument I D # F-4 F4 F-4 F4 F-4 <br /> Conic Spiked 3300pg/kg 3300 pg/kg 3300 pg/kg 3300 Vg/kg 3300 pg/kg <br /> Result 2800 1200 1900 1000 3200 <br /> MS % Recovery 85 36 58 30 97 <br /> I&Dup Result 3000 1900 2200 1400 3500 <br /> D % Recov 91 58 67 42 106 <br /> RPD 69 45 15 33 90 <br /> RPD Limit 029 0-40 0-26 043 0-24 <br /> LCS # S8091OBS SB091OBS SBO91OBS SBO91OBS SBO9108S <br /> Prepared Date 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 <br /> Instrument I D # F4 F-4 F-4 F-4 F-4 <br /> Conc Spiked 3300 fig/kg 3300{tg/kg 3300 Ng/kg 3300 pg/kg 3300 pg/kg <br /> LCS Result 2500 2900 2800 2200 2900 <br /> LCS % Recov 76 88 85 67 88 <br /> LCS 31-137 11-114 28-89 17109 35-142 <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 /> QQAbJJCkLLnterference the LCS recovery 1s 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 2 of 2 <br /> 6090441 TOU <19 <br />