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r) I <br /> Sequoia 680 Chesapeake Dave Redwood City CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> 1900 Bates Avenue,Suite L Concord,CA 94520 (510) 686 9600 FAX(510) 686 9689 <br /> Analytical 819 Straker Avenue Suite 8 Sacramento, CA 95834 (916) 921 9600 FAX(916) 921 0100 <br /> Blaine Tech Services, Inc Client Project ID 950308-K2, Chevron 9-6465 <br /> 985 Timothy Drive Matrix Liquid <br /> San Jose, CA 95133 <br /> Attention Jim Keller Work Order# 9503653 -01-04 Reported Mar 16, 1995 <br /> r 4 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte- Benzene Toluene Ethyl Xylenes <br /> Benzene <br /> QC Batch#. GCO31395BTEX20A GCO31395BTEX20A GCO31395BTEX20A GC031395BTEX20A <br /> Analy Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Prep Method: EPA 5030 EPA 5030 EPA 5030 EPA 5030 <br /> Analyst: J Minkel J Minkel J Minkel J Minkel <br /> MS/MSD# 950344104 950344104 950344104 950344104 <br /> Sample Cone N D ND ND N D <br /> Prepared Date 3/13/95 3/13/95 3/13/95 3/13/95 <br /> Analyzed Date 3/13/95 3/13/95 3/13/95 3/13/95 <br /> Instrument LD # GCHP20 GCHP20 GCHP20 GCHP20 <br /> Cone Spiked 10 erg/L 10 Ng/L 10 erg/L 30 pig/L <br /> Result" 10 11 11 33 <br /> MS% Recovery- 100 110 110 110 <br /> Dup Result 10 11 11 32 <br /> MSD%Recov 100 110 110 107 <br /> RPD 00 00 00 31 <br /> RPD Lima 0-50 0.50 0-50 0-50 <br /> LCS#: - - <br /> Prepared Date. - - - <br /> Analyzed Date - - - - <br /> Instrument I.D.#, - - - - <br /> Cone. Spiked - - - <br /> LCS Result. - - <br /> LCS%Recov: - - - - <br /> LCS 71-133 72-128 72-130 71-120 <br /> Control Limits <br /> Please Note <br /> ZneThe LCS is a control sample of known,interferent-free matrix that is analyzed rising the same reagents, <br /> NALYTICAL 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 /> hin <br /> Project Manager **MS=Matrix Spike,MSD=MS Duplicate,RPD=Relative%Difference 9503653 BLA <1> <br />