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a) SequoiaWhesapeake Drive Redwood City, CA 94063 364-9600 ,�" 415) 364.9233 <br /> 4u t' Wiget Lane Walnut Creek. CA 94598 1 988-9600 F1u((f IO)',�IiU-gen <br /> WWOAnalvtieal 8195tnker Avenue,Suite 8 Sacramento, CA 95834 (916) 921-9600 FAX(91 gr 1h t-0100 <br /> ? 1996 <br /> EMCON Associates Client Project ID: Arco 2168, Stockton :ei31� <br /> 1433 N. Market Blvd. Matrix: Soil <br /> Sacramento, CA 95834 <br /> Attention: Claudio Avila QC Sample Group 602-0355 Reported: Feb 21, 1996" <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene Xylenes <br /> Method: EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst: V.Owens V.Owens V.Owens V.Owens <br /> Concentration <br /> Spiked: 0.20 mg/kg 0.20 mg/kg 0.20 mg/kg 0.60 mg/kg <br /> LCS Batch#: LCS021296 LCS021296 LCS021296 LCS021296 <br /> Date Prepared: 02/12/96 02/12/96 02/12/96 02/12/96 <br /> Date Analyzed: 02/12/96 02/12/96 02/12/96 02/12/96 <br /> Instrument LD.#: GCHP-1 GCHP-1 GCHP-1 GCHP-1 <br /> LCS % <br /> Recovery: 96 96 97 97 <br /> Control Limits: 75-125 75-125 75.125 75-125 <br /> ..�: ... .. :.. . f:; .... .. . :i .. ...„n. <br /> k <br /> „ya.4 <br /> MS/MSD <br /> Batch #: 6020454 6020454 6020454 6020454 <br /> Date Prepared: 02/12/96 02/12;96 02/12,/96 02/12/96 <br /> Date Analyzed: 02/12/96 02/12/96 02/12/96 02/12/96 <br /> Instrument I.D.#: GCHP-1 GCHP-1 GCHP-1 GCHP-1 <br /> Matrix Spike <br /> % Recovery: 84 87 86 89 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery: 86 90 91 93 <br /> Relative % <br /> Difference: 2.4 3.4 5.6 4.4 <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 OC limits for MS/MSD's are advisory only <br /> Janet jijarlan and are not used to accept or reject batch results. <br /> Project Manager/Sacramento Labora ory <br /> 6020355.EMC �3> <br />