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680 Chesapeake Drive Redwood City CA 94063 (650) 364 9600 FAX(650)364 9233 <br /> Sequoia 404 N Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX (510)988 9673 <br /> Analytical 819 Straker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX (9E6)921 0100 <br /> Blame Tech Services, Inc Client Project I D Chevron 9-8264 /971124-S1 <br /> 1680 Rogers Ave Matrix Liquid <br /> San Jose, CA 95112 <br /> Attention Fran Thie Work Order# 9711 F41-01 Reported Dec 16, i 997 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte 1,1-Dichloro- Trichloro Chloro- <br /> ethene ethene Benzene <br /> QC Batch# GC120197801009A GC120197801009A GC120197801009A <br /> Analy Method EPA 8010 EPA 8010 EPA 8010 <br /> Prep Method EPA 5030 EPA 5030 EPA 5030 <br /> Analyst J Minkel J Minkel J Minkel <br /> MS/MSD # 9711FOOOl 9711 F0001 9711 F0001 <br /> Sample Conc N D N D N D <br /> Prepared Date 12/1/97 12/1/97 12/1/97 <br /> Analyzed Date 12/1/97 12/1/97 12/1/97 <br /> Instrument I D # GCHP9 GCHP9 GCHP9 <br /> Conc Spiked 25 pg/L 25 Ng/L 25 pg/L <br /> Result 20 18 20 <br /> MS % Recovery 80 72 80 <br /> Dup Result 19 17 19 <br /> MSD % Recov 76 fib 76 <br /> RPD 51 57 51 <br /> RPD Limit 0-25 0-25 025 <br /> LCS. # BLK120197 BLK120197 BLK120197 <br /> Prepared Date 12/1/97 12/1/97 12/1/97 <br /> Analyzed Date 12/1/97 12/1/97 12/1/97 <br /> Instrument I D # GCHP9 GCHP9 GCHP9 <br /> Conc Spiked 25 ug/L 25 pg/L 25 pg/L <br /> LCS Result 22 19 20 <br /> LCS % Recov 88 76 80 <br /> 60-140 60-140 60.140 <br /> LCS 65-135 70-130 70-130 <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 /> . SEQ OIA ANALYTICAL preparation,and analytical methods employed for the samples The matrix spike is an aliquot of sample <br /> fortified with known quantities of specific compounds and subjected to the entire analytical procedure if <br /> I� the recovery of analytes from the matrix spike does not fall within specified control limits due to matrix <br /> (((/d interference,the LCS recovery is to be used to validate the hatch <br /> Peggy Penner *'MS=Matrix Spike, MSD=MS Duplicate, RPD=Relative%Difference <br /> Project Mana er Page 1 of 2 9711F41 BLA <6> <br />