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E <br /> j SEQUOIA ANALYTICAL <br /> 680 Chesapeake Drive - Redwood City, CA 94063 <br /> (415) 364-9600 - FAX (415) 364-9233 <br /> 1011RESNA' Client Project ID W0376 00, Chevron Stockton <br /> 1710 Main Street Matrix Water <br /> Escalon, CA 95320 <br /> ' Attention John Lane CC Sample Group 3HD3602,4 Reported Sep 7, 1993 v <br /> QUALITY CONTROL DATA REPORT <br /> ' ANALYZE Ethyl- <br /> Benzene Toluene Benzene Xylenes <br /> Method, EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst. M Nipp M Ntpp M Nipp M Nipp <br /> Conc Spiked 10 10 10 30 <br /> Units ug/L lig/L us/L ug/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-2 GCHP-2 GCHP-2 GCHP-2 <br /> LCS % <br /> Recovery: 100 100 100 103 <br /> Control Limits 80-120 80-120 80-120 80-120 <br /> MS/MSD <br /> Batch# 3HE3402 3HE3402 3HE3402 3HE3402 <br /> ' Date Prepared - - - - <br /> Date Analyzed 9/1/93 9/1/93 9/1/93 9/1/93 <br /> Instrument I D.#. GCHP-2 GCHP-2 GCHP-2 GCHP-2 <br /> ' Matrix Spike <br /> % Recovery 97 97 98 97 <br /> ' Matrix Spike <br /> Duplicate% <br /> Recovery 110 100 110 107 <br /> ' Relative% <br /> Difference 13 3 0 12 98 <br /> ' SE4Tagu <br /> ALYTICAL Please Dote <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 /> - validation of sample batch results Due to matrix effects,the CC limits for MS/MSDs are advisory only <br /> and are not used to accept or reject batch results <br /> PIE <br /> � <br /> Project Mana er 3HD3s01 wAT <5> <br />