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w <br /> SEQUOIA ANALYTICAL <br /> 680 Chesapeake Drive • Redwood City, CA 94063 <br /> 0 (415) 364-9600 FAX (415) 364-9233 <br /> Blaine Tech Services, Inc Client Project ID Shell, 4445 Pershing, Stockton <br /> 985 Timothy Drive Matrix Water <br /> San Jose, CA 95133 <br /> Attention Jim Keller QC Sample Group 3HE1001-06 Reported Sep 7, 1993 <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 J Fontcna J Fontcha J Fontcha J Fontcha <br /> Cone Spiked 20 20 20 60 <br /> Units p9/L p9/L pg/L ug/L <br /> LCS Batch# LCSOM193 LCS090193 LCS090193 LCS090193 <br /> Date Prepared 9/1/93 9/1/93 9/1/93 9/1/93 <br /> Date Analyzed 9/1/93 9/1/53 9/1/93 9/1/93 <br /> Instrument I D # GCHP4 GCHP-4 GCHP-4 GCHP 4 <br /> iLCs <br /> Recovery 90 90 88 90 <br /> Control Limits 70.130 70-130 70-130 70.130 <br /> MS/MSD <br /> Batch # 3081288 3081288 3081288 3081288 <br /> Date Prepared 9/1/93 9/1/93 9/1/93 9/1/93 <br /> Date Analyzed 9/1/93 9/1/93 9/1/93 9/11/93 <br /> Instrument I D # GCHP-4 GCHP 4 GCHP-4 GCHP 4 <br /> Matrix Spike <br /> % Recovery 90 90 90 93 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 95 95 90 93 <br /> Relative % <br /> Difference 54 54 00 00 <br /> SEQUOIA ANALYTICAL Please Note <br /> i <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 /> 1 _ - gaTidation of sample batch results Due to matrix etfects the QC limits for MS/MSD s are advisory only <br /> and are not used to accept or reject batch results <br /> JPe9gY AL P or <br /> Project Ma <IgeF 3HE1001 GLA <2> <br /> .J <br />