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Sequoia <br /> od0 Chesapeaxe Drive -�rdwooa Cats Ca 94063 4151 304 9600 =A( (415) 364 9233 <br /> dna vtiea 1900 laces Avenue !111L,, L Concora CA 94520 510) 686 9600 F-kX (510) 686 9689 <br /> 319 5vtker Avenue zuue d �acramenco C- 95834 91 6) 921 9600 F kx (916) 921 0100 <br /> Brown & Caldwell Client Project ID Arco wr2133 Stockton <br /> 9616 Micron Ave Suite 660 Matrix Soil <br /> Sacramento CA 95827 <br /> Attention Steve Misner CC Sample Group 4080277 292 Reported Aug 30 1994 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE <br /> Benzene Toluene Ethyl Xvtenes <br /> Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst N Zahedi A Laliedi N Z inedi N cahcdi <br /> Concentration <br /> Spiked 0 20 mg/Kg 0 20 mg/Kg 0 20 mg/Kg 0 20 mg/Kg <br /> LCS Batch# LCS082694 LCS082694 LCS082694 LCS082694 <br /> Date Prepared 8/26/94 8/26/94 8/26/94 8/26/94 <br /> Date Analyzed 6/26/94 8/26/94 8/26/94 8/26/94 <br /> Instrument I D # HP 1 HP 1 HP 1 HP 1 <br /> LCS % <br /> • Recovery 109 106 108 1094 (�— <br /> Control Limits 55 145 47-149 47 155 56-140 e t-hG, Ct { �� <br /> O. l ITC-1 <br /> MS/MSD <br /> Batch # 4080341 4080341 4080341 4080341 <br /> Date Prepared 8/26/94 8/26/94 8/26/94 8/26/94 <br /> Date Analyzed 8/26/94 8/26/94 8/26/94 8/26/94 <br /> Instrument I D # HP 1 HP 1 HP 1 HP 1 <br /> Matrix Spike <br /> % Recovery 95 100 98 97 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 87 93 88 88 <br /> Relative % <br /> Difference 80 73 11 97 <br /> Please Note <br /> The LCS is a control sample of known interferent free matrix that is analyzed using the same reagents <br /> • SEQUOIA ANALYTICAL 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 OC limas for MS/MSOs are advisory only <br /> -4 [}1w and are not used to accept or reject batch results <br /> Jer'>Aie Higgins <br /> Project Manager 4080277 SRS <4> <br />