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Sequoia- 689 CI'�eupcakc Drive Redwood City CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> `� 404 N Wiget Lane Walnut Cicck CA 94598 (514) 988 9600 FAX(510)988 9673 <br /> �f17 Analytical 819 Striker Avenue Swie 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> Pacific Environmental Group, Inc Client Project ID Arco 2133, Stockton <br /> 11315 Sunrise Gold Circle, #M Matrix Water <br /> Rancho Cordova, CA 95742 <br /> Attention Greg Barclay QC Sample Group 6060849-58 Reported Jul 1, 1996 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene Xyfenes <br /> Method. EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst: V Owens V Owens V Owens V Owens <br /> Concentration <br /> Spiked' 10 ug/L 10 ug/L 10 ug/L 30 ug/L <br /> LCS Batch#. LCS062596 LCS062596 LCS062596 LCS062596 <br /> Date Prepared 06/25/96 06/25/96 06/25/96 06/25/96 <br /> Date Analyzed. 06/25/96 06/25/96 06/25/96 06/25/95 <br /> Instrument I D #' GCHP-2 GCHP-2 GCHP-2 GCHP-2 <br /> LCS % <br /> Recovery 94 97 99 100 <br /> Control Limits 75-125 75-125 75-125 75-125 <br /> n w r w4 qv ` xv.�, t v vv .• f x r r f 1 in w; r t r ✓ ` i } ✓ v V Y <br /> f r m4. .'`cif T.. vv v yr r r rr r ✓ >- • r + rn}r'n-rr.r+ v .nnn rr rrn-+n nn} w}+nr-x3 rvr nvr rnvr rn <br /> MS/MSD <br /> Batch # 6060919 6060919 6060919 6060919 <br /> Date Prepared 06/25/96 06/25/96 06/25/96 06/25/96 <br /> Date Analyzed 06/25/96 06/25/96 06/25/96 06/25/96 <br /> Instrument LD # GCHP-2 GCHP 2 GCHP-2 GCHP-2 <br /> Matrix Spike <br /> % Recovery' 93 97 96 93 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery: 92 94 96 97 <br /> Relative% <br /> Difference. 11 31 00 42 <br /> SEQUOIA 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 /> validation of sample batch results Due to matrix effects the QC limits for MS/MSDs are advisory only <br /> Linda C S Helder and are not used to accept or refect hatch results <br /> Project Manager/Sacramento Labors ory <br /> 6060849 PES <7> <br />