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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650)364-9600 FAX(650)364-9233 <br /> 404 N WI et lane Walnut Creek.CA 94598 <br /> g (925)988-9600 FAX(925)988-9673 <br /> q1W Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916)921-0100 <br /> 1455 McDowell Blvd North Ste D Petaluma.CA 94954 (707)792-1865 FAX(707)792-0342 <br /> Blaine Tech Services, Inc Client Project ID Chevron 9-2033/981109-T2 <br /> 1680 Rogers Ave Matrix Liquid <br /> San Jose, CA 95112 <br /> Attention Christine Lillie Work Order# 9811696-01 Reported Dec 1, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes <br /> Benzene <br /> QC Batch# 8110245 8110245 8110245 8110245 <br /> Analy Method EPA 8015M/8020M EPA 8015M/8020M EPA 8015M/8020M EPA 8015M/8020M <br /> Prep Method EPA 5030 EPA5030 EPA 5030 EPA 5030 <br /> Analyst - <br /> MS/MSD # P81 1 1 38-0 1 P811138-01 P811138-01 P811138-01 <br /> Sample Conc N D N D N D N D <br /> Prepared Date 11/16/98 11/16/98 11/16/98 11/16/98 <br /> Analyzed Date 11/16/98 11/16/98 11/16/98 11/16/98 <br /> Instrument 10 # - - <br /> Conc Spiked 100 pg/L 100pg/L 100fig/L 300pg/L <br /> Result 981 96 969 298 <br /> MS % Recovery 981 96 969 993 <br /> Dup Result 95 927 938 289 <br /> MSD % Recov 95 927 938 963 <br /> RPD 321 35 325 307 <br /> RPD Limit 0-5 0-6 0-4 0-5 <br /> LCS # LCS111698 LCS111698 LCS111698 LCS111698 <br /> Prepared Date 11/16/98 11/16/98 11/16/98 11/16/98 <br /> Analyzed Date 11/16/98 11/16/98 11/15/98 11/16/98 <br /> Instrument I D # - - - <br /> Conc Spiked 100 pg/L 100 pg/L 100 pg/L 300 pg/L <br /> LCS Result 104 101 100 307 — <br /> LCS % Recov 104 101 100 102 <br /> 82-119 80-117 66-125 73-119 <br /> LCS 84-116 81-117 79-115 80-114 <br /> Control Limits <br /> Please Note <br /> SEQUOIA ANALYTICAL The LCS is a control sample of known,interferent-free matrix that is analyzed using the same reagents, <br /> 7 Elap #2245 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 /> the recovery of analytes from the matrix spike does not fall within specified control limits due to matrix <br /> interference,the LCS recovery is to be used to validate the batch <br /> gory <br /> ect Manager **MS=Matrix Spike,MSD=MS Duplicate,RPD=Relative%Difference 9811696 BLA <2> <br />