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SEQUOIA ANALYTICAL <br /> 680 Chesapeake Drive • Redwood City, CA 94063 <br /> 0 Iwo (415) 364-9600 • FAX (415) 364-9233 <br /> Blaine Tech Services, Inc Client Project ID Shell, 141 N El Dorado, Stockton <br /> 985 Timothy Drive Matrix Water <br /> San Jose, CA 95133 <br /> Attention Jim Keller CC Sample Group 3HE8101-10 Reported Sep 7, 1993 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene Xylenes <br /> Method- EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst: M Ntpp M Nipp M Nipp M Nipp <br /> Cone. Spiked- 10 10 10 30 <br /> Units. Y9/L Ng/L F+s/L Y9/L <br /> LCS Batch# BLK090193 BLK090193 BLK090193 BLK090193 <br /> Date Prepared - - <br /> Date Analyzed 9/1/93 9/1/93 9/1/93 9/1/93 <br /> Instrument I D # GCHP-3 GCHP-3 GCHP-3 GCHP-3 <br /> • LCS % <br /> Recovery 99 98 97 100 <br /> Control Limits: 80-120 80-120 80-120 80.120 <br /> MS/MSD <br /> Batch # 3HE3404 3HE3404 3HE3404 3HE3404 <br /> Date Prepared - - - <br /> Date Analyzed 9/1/93 9/1/93 9/1/93 9/1/93 <br /> Instrument I D # GCHP-3 GCHP 3 GCHP-3 GCHP-3 <br /> Matrix Spike <br /> % Recovery 99 100 99 100 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 100 100 100 100 <br /> Relative % <br /> Difference 10 00 10 00 <br /> SEQL=A ANALYTICAL Please Note <br /> The LCS is a control sample of known interferent free matrix that is analyzed using the same reagents, <br /> preparation and analytical methods employed for the samples The LCS%recovery data is used for <br /> 0aer <br /> validation of sample batch results Due to matrix effects,the QC limits for MS/MSDs are advisory only <br /> And are not used to accept or reject batch results <br /> e y <br /> Project 3HE8101 BLA <3> <br />