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Sequoia 680 Chesapeake Drove Redwood City CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> t 404 N Wiget Lane Walnut Creck CA 94598 (510) 988 9600 FAX(5 10) 988 9673 <br /> Analytical 819 Scnker Avenue Suote 8 Sacramento CA 95834 (9 16) 921 9600 FAX (916) 921 0100 <br /> Delta Environmental Consultants Client Project ID Unocal #5886 <br /> 3164 Gold Camp Dr, Suite 200 Matrix Soli <br /> ' Rancho Cordova, CA 95670 <br /> Attention Eric Holm QC Sample Group 507-1403 Reported Aug 10, 1995 <br /> ' QUALITY CONTROL DATA REPORT <br /> ' ANALYTE 1,4-0lchloro N-Nitroso C1- 1,2 4-Trtchloro- 4-Chloro-3- <br /> Phenai 2-Chloroohenol benzene N-oroo !amine benzene Methviohen i <br /> ' <br /> Method. EPA 8270 EPA 8270 EPA 8270 EPA 8270 EPA 8270 EPA 8270 <br /> Analyst: E Manuel E Manuel E Manuel E Manuel E Manuel E Manuei <br /> Concentration <br /> ' Spiked. 100 ug/L 100 ug/L 100 ug/L 100 ug/L 100 ug/L 100 ug/L <br /> LCS Batch#- LCS072795 LCS072795 LCS072795 LCS072795 LCS072795 LCS072795 <br /> ' Date Prepared: 7/27/95 7/27/95 7/27/95 7/27/95 7/27/95 7/27/95 <br /> Date Analyzed 8/2/95 8/2/95 8/2/95 8/2/95 8/2/95 8/2/95 <br /> Instrument I.D #• F4 F4 F4 F4 F4 =4 <br /> ' LCS % <br /> Recovery: 83 82 77 81 85 82 <br /> Control Limits- 5-112 23 134 20-124 RL-230 44-142 22 147 <br /> MS/MSD <br /> Batch #• 9507F89-04 9507F89-04 9507F89-04 9507F89-04 9507F89-04 9507x89-04 <br /> ' Date Prepared. 7/27/95 7/27/95 7/27/95 7/27/95 7/27/95 7/27/95 <br /> Date Analyzed 8/2/95 8/2/95 8/2/95 8/2/95 8/2/95 8/2195 <br /> Instrument I.D #- F4 F4 F4 F4 F4 F4 <br /> ' Matrix Spike <br /> % Recovery' 86 87 so 87 86 85 <br /> ' Matrix Spike <br /> Duplicate % <br /> Recovery. 83 81 76 81 83 82 <br /> ' Relative% <br /> Difference. 36 71 51 71 36 35 <br /> 1 <br /> Please Note <br /> SEQUOIA ANALYTICAL The LCS is a control sample of known interferent free matrm thays analyzed using the same reagents <br /> preoaratlan and analytical methoas employed far,he samples The LCS'a recovery Bata is uses for <br /> r`1 <br /> � val,aatlon or sample tJatcn results Cue to matrix erfec•s he GSC l,mrts.or AASf MSD s are acvsory only i <br /> - -=r <br /> and are not.,sea to accent or reiec•batch results <br /> ' Linda C Schneider <br /> Project Manager Page 1 ct 2 <br /> 5071403 CLT <8> <br /> 1 �� <br />