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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 (510) 988 9600 FAX(510)988 9673 <br /> Analytical 819 Stnker Avenue,Suite 8 Sacramento,CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> (pacific 5nvironme6tal Group Client Project Ib 920-122'1A/Chevron 9-9840 <br /> 11315 Sunrise Gold Circle, Ste M Matrix Sod <br /> Rancho Cordova, CA 95742 <br /> Attention Tim Anenson CC Sample Group 8030077A Reported Mar 18, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene Xylenes <br /> Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst C Lee C Lee C Lee C Lee <br /> Concentration <br /> Spiked. 0 20 mg/kg 0 20 mg/kg 0 20 mg/kg 0 60 mg/kg <br /> LCS Batch# LCS031898 LCS031898 LCS031898 LCS031898 <br /> Date Prepared 03/16/98 03/18/98 03/18/98 03/18/98 <br /> Date Analyzed 03/18/98 03/18/98 03/16/98 03/18/98 <br /> Instrument I D # GCHP-2 GCHP-2 GCHP-2 GCHP-2 <br /> RCS % <br /> Recovery 103 95 90 89 <br /> Control Limits 70-130% 70-130% 70-130% 70-130% <br /> MS/MSD <br /> Batch# 8030354 8030354 8030354 8030354 <br /> Date Prepared 03/18/98 03/18/98 03/18/98 03/16/98 <br /> Date Analyzed 03/18/98 03/18/98 03/18/98 03/18/98 <br /> Instrument I D # GCHP-2 GCHP-2 GCHP-2 GCHP-2 <br /> Matrix Spike <br /> % Recovery 104 97 93 92 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery 104 97 94 92 <br /> Relative% <br /> Difference 00 00 1 1 00 <br /> l <br /> SEQUO ANALYTICAL Please Note <br /> The LCS is a control sample of known,interferent free matrix that is analyzed using the same reagents, <br /> ��� /�����• preparation and analytical methods employed for the samples The LCS%recovery data is used for <br /> ( ( validation of sample batch results Due to matrix effects,the QC limits for MS/MSDs are advisory only <br /> inda C Schn Ider and are not used to accept or refect batch results <br /> Project Manager/Sacramento Laboratory <br /> g� 8030077A PES <3> <br />