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i Sequoia 680 Chesapeake Drive Redwood City CA 94063 (415) 364 9600 FAX (415) 364 9233 404 N Wiget Lane Walnut Creek,CA 94598 (510) 988 9600 FAX (510)988 9673 - I Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX (916)921 0100 Blaine Tech Services, Inc Client Project ID Chevron 9-8632/960207-Z4 Y985 Timothy Drive Matrix Liquid San Jose, CA 95133 Attention Jim Keller Work Order# 9602583-01 „ ` Reported Feb 27, 1996, QUALITY CONTROL DATA REPORT Analyte 1,2,4-Tnchloro 4-Chloro-3 Acenaphthene 4-Nitrophenol benzene Methylphenol GC Batch#: MS0208968270EXZ MS0208968270EXZ MS02089W270EXZ MS0208968270EXZ Analy Method EPA 8270 EPA 8270 EPA 8270 EPA 8270 Prep Method- EPA 3510 EPA 3510 EPA 3510 EPA 3510 Analyst B Pitamah B Pitamah B Pitamah B Pitamah MS/MSD# - - - Sample Conc : - - - Prepared Date Analyzed Date - - - Instrument I D # - - - Conc Spiked -Result- MS % Recovery - - Dup Result - - MSD %Recov - - - RPD - - - RPD Limit. 0-50 0.50 0.50 0-50 LCS # BLK020896 BLK020896 BLK020896 BLK020896 Prepared Date. 2/8/96 2/8/96 2/8/96 2/8/96 Analyzed Date- 2/13/96 2/13/96 2/13/96 2/13/96 Instrument I D # F4 F4 F4 F4 Conc. Spiked 200 pg/L 200 pg/L 200 pg/L 20opg/L LCS Result i50 150 140 130 LCS % Recov . 75 75 70 65 MS/MSD LCS 40-120 30-120 50-140 20-120 Control Limits Please Note The LCS is a control sample of known, interferent-tree matrix that is analyzed using the same reagents, SEO IA LYT AL preparation,and analytical methods employed for the samples The matrix spike is an aliquot of sample fortified with known quantities of specific compounds and subjected to the entire analytical procedure If the recovery of analytes from the matrix spike does not fall within specified control limits due to matrix interference,the LCS recovery is to be used to validate the batch Pe gy en r **MS=Matrix Spike,MSO=MS Duplicate,RPD=Relative%Difference Proj Manager Page 2 of 3 9W25a3 BLA mss'