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(D Sequoia 680 Chesapeake Dnve Redwood City,CA 94463 (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 Striker 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 # 9511587-17 Reported Nov 16, 1995 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte 24-Dinitro- Pentachloro- Pyrene <br /> toluene phenol <br /> OC Batch# MS1109958270EXA MS1109958270EXA 1VIS1109958270EXA <br /> Analy Method EPA 8270 EPA 8270 EPA 8270 <br /> Prep Method EPA 3550 EPA 3550 EPA 3550 <br /> Analyst 8 Pitamah B Pltamah B Pltamah <br /> MS/MSD # 951156001 951156001 951156001 <br /> Sample Conc N D N D N D <br /> Prepared Date 11/9/95 11/9/95 11/9/95 <br /> Analyzed Date 11/9/95 11/9/95 11/9/95 <br /> Instrument I D # H5 H5 H5 <br /> Conc Spiked 3300 ug/Kg 3300 ug/Kg 3300 ug/Kg <br /> Result 2300 2000 2500 <br /> MS % Recovery 70 61 76 <br /> Dup Result 2300 2000 2600 <br /> MSD % Recov 70 61 79 <br /> RPD 00 00 39 <br /> RPD Limit 0-50 0-50 0-50 <br /> LCS # BLK110995 BLK110995 BLK110995 <br /> Prepared Date 11/9/95 11/9/95 11/9/95 <br /> Analyzed Date 11/9/95 11/9/95 11/9/95 <br /> Instrument I D # F4 F4 F4 <br /> Conc Spiked 3300 ug/Kg 3300 Vg/Kg 3300 pg/Kg <br /> LCS Result 2400 2400 2600 <br /> LCS % Recov 73 73 79 <br /> MS/M9D <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 /> SEQ 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 Cargasacchl **NIS=Matrix Spike, MSD=MS Duplicate,RPD=Relative%Difference <br /> Project Manager Page 3 of 3 9511587 TTT <9> <br />