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VI el) Sequoia 690 Chesapeake Drive Redwood City CA 94063 (415) 364 9600 FAX (415) 364 9233 1900 Bates Avenue Suite L Concord CA 94520 (510) 686 9600 FAX (510)686 9689 Analytical 819 Striker Avenue,Suitt 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 Blaine Tech Services, Inc Client Project ID 950223-K2, Chevron S221-5 985 Timothy Drive Matrix Liquid San Jose, CA 95133 Attention Jim Keller Work Order# 9502F29-04 Reported Mar 3, 1995 QUALITY CONTROL DATA REPORT Analyte. Benzene Toluene Ethyl Xylenes Benzene GC Batch#. GCO22895BTEX07A GCO22895BTEK07A GCO22895BTEX07A GCO22895STEX07A Analy Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 Prep Method- EPA 5030 EPA 5030 EPA 5030 EPA 5030 Analyst M Balatti M Balatti M Balatti M Balatti MS/MSD # 9502/36101 9502D6101 9502D6101 9502136101 Sample Conc. N D N D N D N D Prepared Date. 2/28/95 2/28/95 2/28/95 2/28/95 Analyzed Date- 2/28/95 2/28/95 2/28/95 2/28/95 Instrument I D # GCHP7 GCHP7 GCHP7 GCHP7 Conc Spiked 10Ng/L 10pg/L 10pg/L 30ug/L Result: 10 11 10 32 . MS %Recovery: 100 110 100 107 Dup Result 10 10 10 32 MSD% Recov. 100 100 100 107 RPD- 00 95 00 00 RPD Limit 0-50 0-50 0-50 0.50 LCS #: - - - Prepared Date- - - Analyzed Date. - - Instrument I.D #* - - Conc Spiked: - - - LCS Result. - - LCS % Recov : - - - - 71-133 72-128 72-130 71-120 LCS Control Limits Please Note The LCS is a control sample of known,Interferent-free matrix that is analyzed using the same reagents, V I A ALYTICAL 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 hin Project Manager **MS=Matrix Spike,MSD MS Duplicate,RPD=Relative%Difference 9502F29 BLA <2>