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sEQUOIA"ANALYTICAL <br /> 680 Chesapeake Drive - Redwood City, CA 94463 <br /> (415) 364-9640 FAX(415) 364-9233 <br /> RESNA Client Project ID: 150053.01,Stone Bros. <br /> 1710 Main Street Matrix: soil <br /> Escalon. CA 95320 <br /> Attention: Greg Stahl OC Sam a Group- 3JC 35ol-9 Reported: Ckx 29, 1993 <br /> Y .. ..r. <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyi- <br /> Benzene Tduene Benzene Xylenes <br /> Method: EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst: R Geckbr R Cockier R Geckler R Gelder <br /> Cone.Spiked: 020 020 020 0.60 <br /> Units: mg/kg mg/kg mg/kg mg/kg <br /> LCS Batch#: si-K102593 BLK1025W BLK102593 BLK102593 <br /> Date Prepared: 10/25/93 10/25/93 10/2.55/93 10/25/93 <br /> Date Analyzed: 10/25/99 10/25/99 10/25/93 10/25/93 <br /> Instrument I.D.#: GCHP-18 GCHP-18 GCHP-18 GCHP-18 <br /> LCS % <br /> Recovery: 100 100 100 100 <br /> Control Limits: 60-140 60-140 60-140 60-140 <br /> 'h.� :•di j"�,» _ .4 .-fin ''�:i`a.. 'i t i H6. w '` <br /> MS/MSD <br /> Batch#: 3JB6202 3JB6202 3JB6202 W56202 <br /> Date Prepared: 10/25/93 10/25/53 10/25/93 10/25/93 <br /> Date Analyzed:- 1o/25/g3 10/25/93 10/25/93 10/25/93 <br /> Instrument I.D.#: GCHP-18 GCHP 18 GCHP-18 GCHP-18 <br /> Matrix Spike <br /> %Recovery: 100 100 100 100 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery: 100 100 100 100 <br /> Relative% <br /> Difference: 0.0 0.0 0.0 0.0 <br /> SEQUOIA ANALYTICAL Please Mote: <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 /> hT( varhUtion of sample batch results. Due to matrix effects,the CC limits for MS/MSD's are advisory only <br /> and are not used to accept or reject batch results. <br /> Vickie Tagi.Ye <br /> Project Manager 3JC 3501.wAT <5> <br />