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Sequoia 690 Chesapeake Dnve Redwood City CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> 004 N Wtget Lane Walnut Creek CA 94598 (510) 988 9600 FAX(510)988 9673 <br /> Analytical 819 Sinker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> �IlO <br /> *Pacff i c Environmental Group, Inc Client Project ID Arco 434, Lodi, CA <br /> 11315 Sunrise Gold Circle, #M Matrix Water <br /> Rancho Cordova, CA 95742 <br /> Attention Greg Barclay OC Sample Group 6020676-0688 Reported Feb 29, 1996 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene Xylenes_ <br /> Method. EPA 8020 EPA 8024 EPA 8020 EPA 8020 <br /> Analyst- BW/CC BW/CC BW/Cc BW/CC <br /> Concentration <br /> Spiked. 10 ug/L 10 ug/L 14 ug/L 30 ug/L <br /> LCS Batch#: LCS022196 LCS022196 LCS022196 LCS022196 <br /> Date Prepared 02/21/96 02/21/96 02/21/96 02/21/96 <br /> Date Analyzed- 02/21/96 02/21/96 02/21/96 02/21/96 <br /> Instrument I D#. GCHP-2 GCHP-2 GCHP-2 GCHP-2 <br /> . LCS % <br /> Recovery, 92 92 98 96 <br /> Control Limits' 75-125 75-125 75-125 75-125 <br /> MS/MSO <br /> Batch#- 6020624 6020624 6020624 6020624 <br /> Date Prepared' 02/21/96 02/21/96 02/21/96 02/21/96 <br /> Date Analyzed 02/21/96 02/21/96 02/21/96 02/21/96 <br /> Instrument I D#- GCHP-2 GCHP-2 GCHP 2 GCHP-2 <br /> Matrix Spike <br /> % Recovery 94 93 94 94 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 81 80 84 82 <br /> Relative % <br /> Difference 15 15 11 14 <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/MSD s are advisory only <br /> Janet HA an and are not used to accept or reject batch results <br /> Project anager/Sacramento Labors ory <br /> 6020676 PES <4> <br />