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Sequ <br /> . <br /> (D- <br /> . 630 Cnesapeak: Drive Rcd,.rood Ciry940o'3 (415) 3o-F•9600 FAX(i15) 364-9233 <br /> �„ Analytical 404 N. �got Lane Walnut Crcck,CA 94593 (510) 988.9600 FAX(5 10)988.967 3 <br /> 819 Smkcr Avenue,SuiCc 3 Sacramento,CA 95834 (916) 92t-9600 FAX(9 16) 92t-0100 <br /> Brown &Caldwell Client Project ID: Arco 5450, 5tock-ton - <br /> 9616 Micron Ave., Suite 600 Matrix: Soil <br /> Sacramento, CA 95827 <br /> Attention Steve Misner QC Sampfe Group 5100252-265 Reported: Oct 19, 1995.,; <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene :Toluene Benzene Xylenes Lead <br /> Method: EPA 6020 EPA 8020 EPA 8020 EPA 8020 EPA 6010 <br /> Analyst: V.Owens V.Owens V.Owens V.Owens K.Barta i <br /> Concentration <br /> Spiked: 0.20 mg/kg 0.20 mg/kg 0.20 mg/kg 0.60 mg/kg 50 mg/kg <br /> LCS Batch#: LCS101295 LCS101295 LCS101295 LCS101295 LCS100995 i <br /> Date Prepared: 10/12/95 1f0/12/95 10/12/95 10/12/95 10/9/95 <br /> Date Analyzed: 10/12/95 10/12/95 10/12/95 10/12/95 10/17/95 I <br /> Instrument I.D.#: GCHP-2 GCHP-2 GCHP-2 GCHP-2 MTJA-2 <br /> LCS % <br /> Recovery: 101 100 98 99 98 <br /> Control Limits: 75-125 -75-125 75-125 75-125 80-120 <br /> MS/MS0 <br /> Batch#: 5100205 5100205 5100205 5100205 5100252 <br /> Date Prepared: 10/12/95 10/12/95 10/12/95 10/12/95 10/9/95 <br /> Date Analyzed: 10/12/95 10/12/95 10/12/95 10/12/95. 10/11/95 <br /> Instrument I.D.#: GCHP.2 GCHP-2 GCHP-2 GCHP-2 MTJA-2 <br /> Matrix Spike <br /> % Recovery: 100 98 99 98 86 <br /> Matrix Spike <br /> Duplicate <br /> Recovery: 88 88 98 85 92 <br /> Relative% <br /> Difference: 13 11 11 9.0 6.7 <br /> SEQUOIA ANALYTICAL Please Note: <br /> HC 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 /> .tant arias and are riot used to accept or reject batch results. <br /> Pro ct Manager. <br /> 5100252.BRS <9> <br />