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Sequoia 680 Chesapeake Drive Redwood City,CA 94063 (415) 364-9600 FAX(415)364 9233 <br /> 4111 Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX(5io)988-9673 <br /> 11111twy Analytical 819 Striker Avenue,Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> .<5AM-West <br /> Ghent Project ID #2308 00/Catellus-Stockton <br />' 1777 Botelho Dr, Ste 260 Matrix Liquid <br /> Walnut Creek, CA 94596 <br /> Attention Arun Chemburkar CC Sample Group 4111006-16 Reported Dec 5, 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 J Minkel J Minkel J Minkel J Minkel <br /> MS/MSD G9411C26 G9411C26 G9411C26 G9411C26 <br /> Batch# -03D -03D -03D -03D <br /> ' Date Prepared: N/A N/A N/A N/A <br /> Date Analyzed- 11/30/94 11/30/94 11/30/94 11/30/94 <br /> Instrument I.D.#• GCHP-02 GCHP-02 GCHP-02 GCHP-02 <br /> Conc. Spiked- 10pg/L 10pg/L 10pg/L 30pg/L <br /> ' Matnx Spike <br /> %Recovery: 100 100 99 100 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery loo 100 96 97 <br /> ' Relative% <br /> Difference: 00 00 31 34 <br /> ' LCS Batch#. - _ <br /> Date Prepared: - - <br /> ' Date Analyzed: _ <br /> Instrument I.D.#: <br /> LCS % <br /> ' Recovery: - - <br /> ecovery <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,#1210 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 /> of al rom the matrix spike does not fall within specified control limits due to matrix <br /> Interference,the LCS recoveN is to be used to validate the batch <br /> Kenneth K R Lee <br /> Laboratory Director <br /> ' 4111006 ERM <4> <br />