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Sequoia 680 Chesapeake Drive Redwood City,CA 94063 (650) 364 9600 FAX(650)364 9233 <br /> 404 N Wiget Lane Walnut Creek,CAA 94598 (510) 988 9600 FAX(510)989 9673 <br /> Analytical 819 Striker Avenue Suite 8 Sacramento, CA 95834 (916) 92.1 9600 FAX(916)921 0100 <br /> qwr <br /> Settler-Ryan Client Project ID UNOCAL #5421-Stockton <br /> 6747 Sierra Court, Suite J Matrix Solid <br /> Dublin, CA 94568 <br /> Attention Clyde Galantine QC Sample Group 8041420 Reported May 6, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Phenol 2-Chlorophenol 1,4-Dichloro N-Nitroso Di- 1 24 Trichioro 4-Chloro 3 <br /> benzene N propylamine benzene Methylphenol <br /> QC Batch# SP042898 SP042898 SP042898 SP042898 SP042898 SP042898 <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 L Diaz L Diaz L Diaz L Diaz L Diaz L Diaz <br /> MS/MSD # 8041711 8041711 8041711 8041711 8041711 8041711 <br /> Sample Cone N D N D N D N D N D N D <br /> Prepared Date 4/28/98 4/28/98 4/28/98 4/28/98 4/28/98 4/28/98 <br /> Analyzed Date 4/28/98 4/28/98 4/28/98 4/28/98 4/28/98 4/28/98 <br /> Instrument I D # GC/MS-1 GC/MS-1 GC/MS-1 GC/MS-1 GC/MS-1 GC/MS-1 <br /> Cone Spiked 5000 fug/kg 5000 fug/kg 3300 fug/kg 3300 fug/kg 3300 fug/kg 5000 fug/kg <br /> Result 2,500 2,600 1,500 2,200 2,100 3,400 <br /> MS % Recovery 50 52 45 67 64 68 <br /> Dup Result 2,200 2,200 1,300 1,900 1700 2900 <br /> MSD % Recov 44 44 39 58 52 58 <br /> RPD 13 17 14 15 21 16 <br /> RPD Limit 0-40 0-40 040 040 040 0-40 <br /> LCS # BLK042898 BLK042898 BLK042898 BLK042898 BLK042898 BLK042898 <br /> Prepared Date 4/28/98 4/28/98 4/28/98 4/28/98 4/28/98 4/28/98 <br /> Analyzed Date 4/28/98 4/28/98 4/28/98 4/28/98 4/28/98 4/28/98 <br /> Instrument I D # GC/MS-1 GC/MS-1 GC/MS 1 GC/MS-1 GC/MS-1 GC/MS-1 <br /> Cone Spiked 5000 fug/kg 5000,ug/kg 3300 fug/kg 3300 fug/kg 3300 fug/kg 5000 fug/kg <br /> LCS Result 3000 3500 2000 2700 2300 3600 <br /> LCS % Recov 60 70 61 82 70 72 <br /> LCS 26-90 25-102 28104 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 /> EQUOIA 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 tail within specified control limits due to matrix <br /> [ l� interference,the LCS recoveryis to be used to validate the batch <br /> **MS=Matrix Spike, MSD=MS Duplicate RPD=Relative% Difference <br /> A an B e <br /> Labor tor/Director Page 1 of 2 <br /> 8041418 GET <12 a <br />