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Sequoia 680 Chesapeake Dnve Redwood City,CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> 1900 Hates Avenue,Suite L Concord,CA 94520 (510) 686 9600 FAX(510)686 9689 <br /> Analytical 819 Striker Avenue,Suite 8 Sacramento,CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> PR ES'N' Client Project ID i50041 01, San Joaquin C C <br /> 1710 Main Street Matrix Liquid <br /> Escalon, CA 95320 <br /> Attention Lots Frantz QC Sample Group 4F17001-02 Reported Jun 8, 1994 <br /> f v r ff r ♦ ♦ `W M r xf r f xf 4 w ` f v v ` f ♦{ <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. A.Miraftab A.Miraftab A Miraftab A Miraftab <br /> MS/MSD <br /> ' Batch#- 4F15201 4F15201 4F15201 4F15201 <br /> Date Prepared: - - - - <br /> Date Analyzed: 6/4/94 6/4/94 6/4/94 6/4/94 <br /> ' Instrument I.D.# GCHP-17 GCHP-17 GCHP-17 GCHP-17 <br /> Cork. Spiked: 10 Ng/L 10 ug/L 10 ug/L 30 pg/L <br /> Matrix Spike <br /> %Recovery. 95 94 93 93 <br /> Matrix Spike <br /> ' Duplicate% <br /> Recovery: 100 100 100 103 <br /> ' Relative% <br /> Difference 51 62 73 10 <br /> t k <br /> LCS Batch#, - - <br /> ' Date Prepared: <br /> Date Analyzed. - <br /> instrument I D.#* - - <br /> ' LCS% <br /> Recovery. - - - - <br /> Recovery <br /> Control Limits: 71-133 72-128 72-130 71-120 <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 /> Vf ( interference,the LCS recovery is to be used to validate the batch <br /> Vickie Tague Clark <br /> Project Manager 4F17001 WAT <2> <br />