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Sequoia 680 Chesapeake Dnve 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 /> la)-lAnalytical Big Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916) 921 0100 <br /> 0ouchstone Developments Client Project ID Chevron #9-4183 <br /> 781 Kingston Ave Matrix Solid <br /> Oakland, CA 94611 <br /> Attention Robert Mallory OC Sample Group 6041944-948 Reported May 6, 1996 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Phenol 2-Chlorophenol 1,4-Dichloro N-Nitroso-Di- 1,2,4-Tnchloro 4-Chloro-3 <br /> benzene N-propylamine benzene Methylphenol <br /> QC Batch# SP042996 SP042996 SP042996 SP042996 SP042996 SP042996 <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 T Granicher T Granicher T Granicher T Granicher T Granicher T Granicher <br /> MS/MSD # 6041872 5041872 6041872 6041872 6041872 6041872 <br /> Sample Conc N D N D N D N D N D N D <br /> Prepared Date 4/29/96 4/29/96 4/29/96 4/29/96 4/29/96 4/29/96 <br /> Analyzed Date 4/30/96 4/30/96 4/30/96 4/30/96 4/30/96 4/30/96 <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 5000yg/kg 5000 Pg/kg 2500 Mg/kg 2500Ng/kg 2500 pg/kg 5000frg/kg <br /> Result 4300 4700 2300 2500 2600 4700 <br /> MS % Recovery 86 93 90 98 104 94 <br /> ODup Result 4600 5100 2500 2700 2900 5500 <br /> MSD % Recov 92 101 98 108 116 110 <br /> RPD 67 83 85 97 11 16 <br /> RPD Limit 035 0-50 0-27 0-38 0-23 0-33 <br /> LCS # LCS050196 LCS050196 LCS050196 LCS050196 LCS050196 LCS050196 <br /> Prepared Date 5/1/96 5/1/96 5/1/96 5/1/96 5/1/96 5/1/96 <br /> Analyzed Date 5/2/96 5/2/96 5/2/96 5/2/96 5/2/96 5/2/96 <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 ug/kg 2500 pg/kg 2500 ug/kg 2500 erg/kg 5000 fig/kg <br /> LCS Result 3900 4200 2100 2400 2400 4600 <br /> LCS % Recov 77 84 82 96 94 92 <br /> LCS 15-115 30-120 30-120 30-120 40-120 40-120 <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, #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 /> 1 interference the LCS recovery is to be used to validate the batch <br />*(L/ "MS=Matrix Spike, MSD=MS Duplicate, RPD=Relative% Difference <br /> Kevin Van Slambrook <br /> Project Manager Page 1 of 2 <br /> 6041944 TUD <13> <br />