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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650)364-9600 FAX(650)364-9233 <br /> 404 N Wiget Lane Walnut Creek,CA 94598 (514)988-9600 FAX(510)988-9673 <br /> Analytical819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916)921-0100 <br /> 1455 McDowell Blvd North Ste D Petaluma,CA 94954 (707)792-1865 FAX(707)792-0342 <br /> • <br /> Cambria Environmental Tech Client Project ID Shell 1071 N Main Manteca <br /> 114465th St, Ste C Matrix Solid <br /> Oakland, CA 94608 <br /> Attention Paul Waite Work Order# 9803J61 01, 03, 04 Reported Apr 15, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte. Methanol Ethanol lso-Propanol <br /> OC Batch# GCO401981SHSHSB G00401981SHSHSB GCO401981SHSHSB <br /> Analy. Method: 1SHS ISHS iSHS <br /> Prep Method HS HS HS <br /> Analyst- T Sears T Sears T Sears <br /> MS/MSD# 9803J5701 98WJ5701 9803J5701 <br /> Sample Conc N D N o N D <br /> Prepared Date- 4/1/98 4/1/98 4/1/98 <br /> Analyzed Date- 4/1/98 4/1/98 4/1/98 <br /> Instrument I.D # GCV1 GCV1 GCvi <br /> Conc Spiked. 8 0 mg/Kg 8 0 mg/Kg 8 0 mg/Kg <br /> Result 83 91 87 <br /> MS %Recovery- 104 114 109 <br /> Dup Result 89 95 88 <br /> MSD % Recov 111 119 110 <br /> RPD 70 43 11 <br /> RPD Limit 0-50 0-50 0-50 <br /> LCS# BLK040198 BLK040198 BLK040198 <br /> Prepared Date 4/1/98 4/1/98 4/1/98 <br /> Analyzed Date 4/1/98 4/1/98 4/1/98 <br /> Instrument I.D.#. GCV1 GCvi GCv1 <br /> Conc. Spiked 8 0 mg/Kg 8 0 mg/Kg 8 0 mg/Kg <br /> LCS Result 84 90 91 <br /> LCS % Recov. 105 113 114 <br /> LCS <br /> Control Limits 70-130 70-130 70-130 <br /> - Please Note <br /> The LCS is a control sample of known,interferent-free matrix that is analyzed using the same reagents, <br /> dwEQUOIA 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 /> Richard Herlin <br /> Project Manager **MS=Matrix Spike, MSD=MS Duplicate,RPD=Relative%Difference 9803J61 GCC <1> <br />