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Sequoia 680 Chesapeake Onve Redwood City CA 94063 (415) 364-9600 FAX(415) 364-9233 <br /> ta) <br /> Analytical 1 40.4 N % iget Lane Walnut Creek,CA 94598 (510) 988-96W FAX(510)988%73 <br /> naly�tieal 819 5tnker Avenue Suite 8 Sacramento,CA 95834 (916) 921-9600 FAX(916)921-0100 <br /> 4Pown and Caldwell Client Project ID Arco #2093, Bracy <br /> 616 Micron Ave , Ste 600 Matrix Liquid <br /> Sacramento, CA 95827 <br /> Attention Steve Misner QC Sample Group 7060709-715 Reported Jun 25, 1997 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte- Benzene Toluene Ethyl Xylenes <br /> Benzene <br /> QC Batch#. GC061797 GCO61797 00061797 GCO61797 <br /> 802002A 602002A 802002A 802002A <br /> Analy Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Prep Method EPA 5030 EPA 5030 EPA 5030 EPA 5030 <br /> Analyst K Nil] K NEII K Noll K Noll <br /> MS/MSD #- 7060351 7060351 7060351 7060351 <br /> Sample Cone ND N D N D N D <br /> Prepared Date- 6/17/97 6/17/97 6/17/97 6/17/97 <br /> Analyzed Date- 6/17/97 5/17/97 6/17/97 6/17/97 <br /> Instrument I D.#- HP-2 HP-2 HP-2 HP-2 <br /> Conic Spiked 20ug/L 20ug/L 20ug/L 60ug/L <br /> Result. 10 12 11 32 <br /> MS % Recovery- 5o 60 55 53 <br /> Dup Result 17 20 18 55 <br /> �SD %Recov.. 85 100 90 92 <br /> RPD 52 50 48 53 <br /> RPD Limit 0-20 0.20 0.20 0.20 <br /> LCS #. 2LCS061797 2LCS061797 2LCS061797 2LC8061797 <br /> Prepared Date 6/17/97 6/17/97 6/17/97 6/17/97 <br /> Analyzed Date- 6/17/97 6/17/97 6/17/97 6/17/97 <br /> Instrument I D #- HP-2 HP-2 HP-2 HP-2 <br /> Conc Spiked 20ug/L 20ug/L 20ug/L 60jig/L <br /> LCS Result 16 19 17 53 <br /> LCS % Recov so 95 85 88 <br /> LCS 70-130 70-130 70-130 70-130 <br /> Control Limits <br /> Quality Assurance Statement All standard operating procedures and quality control requirements have been met <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, #1271 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 /> he recovery of analytes from the matrix spike does not fall within specified control limits due to matrix <br /> r rference,the LCS recove Is to be used to validate the batch <br /> Melissa A Brewer t*MS-Matrix pike, MSD-MS Duplicate,RPD af elative 9 Difference <br /> Client Services Representative <br /> 7060709 BAS <4> <br />