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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (415) 364 9600 FAX (415) 364 9233 <br /> la)— 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 /> Gettler Ryan/Geostrategles Client Project ID Chevron 9-6171, Stockton <br /> 6747 Sierra Court, Ste J Matrix Liquid <br /> Dublin, CA 94568 <br /> Attention Deanna Harding Work Order# 9608665 -02 -07 Reported Aug 27, 1996 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Beryllium Cadmium Chromium Nickel <br /> QC Batch# ME0815966010M2-A ME0815966010M2A ME081596601OM2A ME0815966010M2A <br /> Analy Method EPA 6010 EPA 6010 EPA 6010 EPA 6010 <br /> Prep Method EPA 3010 EPA 3010 EPA 3010 EPA 3010 <br /> Analyst C Medefesser C Medefesser C Medefesser C Medefesser <br /> MS/MSD # 9608665-07 9608665-07 9608665-07 9608665-07 <br /> Sample Cone NO NO N D ND <br /> Prepared Date 8/15/96 8/15/96 8/15/96 8/15/96 <br /> Analyzed Date 8/15/96 8/15/96 8/15/96 8/15/96 <br /> Instrument LD # MTJA2 MTJA2 MTJA2 MTJA2 <br /> Cone Spiked 1 0 mg/L 1 0 mg/L 1 0 mg/L 1 0 mg/L <br /> Result 10 11 10 10 <br /> IS % Recovery 100 110 100 100 <br /> Dup Result 10 11 10 10 <br /> ISD % Recov 100 110 100 100 <br /> RPD 00 00 00 00 <br /> RPD Limit 0-20 0-20 0-20 0-20 <br /> LCS # M1070396 M1070396 M1070396 M1070396 <br /> Prepared Date 7/3/96 7/3/96 7/3/96 7/3/96 <br /> Analyzed Date 8/15/96 8/15/96 8/15/96 8/15/96 <br /> Instrument I D # MTJA2 MTJA2 MTJA2 MTJA2 <br /> Cone Spiked 5 0 mg/L 5 0 mg/L 5 0 mg/L 5 0 mg/L <br /> CCV Result 48 49 49 48 <br /> CCV% Recov 96 98 98 96 <br /> LCS 80-120 80-120 80-120 80-120 <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 /> 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 /> interference,the LCS recovery is to be used to validate the batch <br /> 1t- regory <br /> Project Manager **MS=Matrix Spike, MSD=MS Duplicate,RPD=Relative% Difference 9608665 GET <3> <br />