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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (415) 364-9600 FAX(415) 364 9233 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX(510) 988 9673 <br /> Analytical 819 Straker Avenue,Suite 8 Sacramento,CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> Touchstone Developments Client Project ID Chevron 9-8264/8264-1 <br /> 6280 Stoneridge Mall Rd , B211 Matrix Solid <br /> Pleasanton, CA 94588 <br /> Attention Anne Marie Dockstader Work Order# 9511553-05 Reported Nov 14, 1995 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte: 2,4-Dindro- Pentachloro- Pyrene <br /> toluene phenol <br /> QC Batch#: MS1107958270EXA MS1107958270EXA MS1107958270EXA <br /> Analy Method: EPA 8270 EPA 8270 EPA 8270 <br /> Prep Method: EPA 3550 EPA 3550 EPA 3550 <br /> Analyst: B Pitamah B Pitamah B Pitamah <br /> MS/MSD#- - - - <br /> Sample Conc . - - <br /> Prepared Date. <br /> Analyzed Date - - <br /> Instrument LD # - - <br /> Conc Spiked- <br /> Result - <br /> MS % Recovery - <br /> Dup Result: - - <br /> MSD % Recov.. - - <br /> RPD: - - - <br /> RPD Lima: 0.50 0.50 0-50 <br /> LCS #: BLK110795 BLKi10795 BLK110795 <br /> Prepared Date: 11/7/95 11/7/95 11/7/95 <br /> Analyzed Date: 11/7/95 11/7/95 11/7/95 <br /> Instrument LD #: F4 F4 F4 <br /> Conc. Spiked: 3300 pg/Kg 3300 pg/Kg 3300 pg/Kg <br /> LCS Result: 2400 2600 3000 <br /> LCS % Recov : 73 79 91 <br /> MS/MSD <br /> LCS 39-139 14.176 52-115 <br /> Control Limits <br /> Please Note <br /> The LCS is a control sample of known,interferent-free matrix that is analyzed using the same reagents, <br /> SE OIA 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 /> interference,the LCS recovery is to be used to validate the batch <br /> Mark J Cargasacchi **MS=Matrix Spike, MSD=MS Duplicate,RPD=Relative%Difference <br /> Project Manager Page 3 of 3 9511553 TTT <3> <br />