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� u <br /> SEQUOIA ANALYTICAL <br /> 680 Chesapeake Drive • Redwood City,CA 94063 <br /> (415) 364-9600 FAX (415) 364-9233 <br /> Client Project ID: 150053.02,Stone Bros. <br /> <:1710 Main Street Matrix: Solid <br /> Escalon, CA 95320 <br /> ::'::...Attention: Greg Stahl OC Sample Group: 4A64601 Reported: Jan 1 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Benzene Toluene Ethyl Xylenes <br /> Benzene <br /> Method: EPA$020 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst: R.Geckler R.Geckler R.Geckler R.Geckler <br /> MS/MSD <br /> Batch#: 4A54201 4A54201 4A54201 4A54201 <br /> Date Prepared: 1/14/94 1/14/94 1/14/94 1/14/94 <br /> Date Analyzed: 1/14/94 1/14/94 1/14/94 1/14/94 <br /> Instrument I.D.#: GCHP-18 GCHP-18 GCHP-18 GCHP-18 <br /> Cone. Spiked: 0.20 mg/kg 0.20 mg/kg 0.20 mg/kg 0.60 mg/kg <br /> Matrix Spike <br /> %Recovery: 90 95 95 95 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery: 90 95 95 95 <br /> Relative% <br /> Difference: 0.0 0.0 0.0 0.0 <br /> LCS Batch#: - - <br /> Date Prepared: - <br /> Date Analyzed: <br /> Instrument I.D.#: - - <br /> LCS% <br /> Recovery: - - <br /> % Recovery <br /> Control Limits: 55-145 47-149 47-155 56-140 <br /> Please Note: <br /> The LCS is a control sample of known,interferent free matrix that is analyzed using the same reagents, <br /> SEQUOIA ANALYTICAL preparation,and analytical methods employed for the samples. The matrix spike is an aliquot of sample <br /> � /� fortified with known quantities of specific compounds and subjected to the entire analytical procedure. if <br /> ! the recovery of analytes from the matrix spike does not fall within specified control limits due to matrix <br /> UUU l� interference,the LCS recovery is to be used to validate the batch. <br /> Vickie Tague <br /> Project Manager 4A64601.WAT <2> <br />