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A. �, � Sequoia 680 Chesapeake Dave Redwood City,CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> 1900 Bates Avenue Suite L Concord CA 94520 (510) 686 9600 FAX(510)686 9689 <br /> Analytical 619 Sinker Avenue Suite a Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> OESNA rn �' r "�Ilent Project ID 150041 01, San Joaquin <br /> 1710 Main Street Matrix Liquid <br /> Escaion,CA 95320 <br /> Attention Greg Stahl OC Sample Group 94101-108 -01 Reported Nov 21, 1994 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Benzene Toluene Ethyl Xylenes <br /> Benzene <br /> Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst. N Zahedi N Zahedi N Zahedi N Zahedl <br /> MS/MSD <br /> Batch#. 4100548 4100548 4100548 4100548 <br /> Date Prepared: 11/1/94 11/1/94 11/1/94 11/1/94 <br /> Date Analyzed: 11/1/94 11/1/94 11/1/94 11/1/94 <br /> Instrument I D.#: GCHP1 GCHP1 GCHP1 GCHP1 <br /> Conc.Spiked, 10 ug/L 10 ug/L 10 ug/L 30 ug/L <br /> Matrix Spike <br /> %Recovery: 86 96 97 98 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery: 88 86 85 86 <br /> Relative% <br /> Difference. 23 11 13 13 <br /> n, S[•r J ryr n. nr. + O v r. , n . 1 nn nu v rk i .. 1 . <br /> LCS Batch#• LCS110194 LCS110194 LCS110194 LCS110194 <br /> Date Prepared, 11/1/94 11/1/94 11/1/94 11/1/94 <br /> Date Analyzed 11/1/94 11/1/94 11/1/94 11/1/94 <br /> Instrument LD #: GCHP1 GCHP1 GCHP1 GCHP1 <br /> LCS % <br /> Recovery, as 97 99 102 <br /> %Recovery <br /> Control Limits: 71-133 72-128 72-180 71-120 <br /> Please Note <br /> The LCS 1s a control sample of known,interferent free matrix that 1s 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 /> ELAP#2000 fortified with known quantities of specific compounds and subjected to the entire analytical procedure n <br /> 0 %qT-d(1WL-- <br /> the recovery of analytes from the matrix spike does not fall within specified control limas due to matrix <br /> interference,the LCS recovery Is to be used to validate the batch <br /> Vickie Tague Clark <br /> Project Manager 941OH08 WAT <1> <br />