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Sequoia 680 Chesapeake Dr-e Redwood City CA 94063 (415) 364 9600 1 A(415) 364 9133 <br /> 404 N Wiger Lane Walnut Creek CA 94598 (510) 988 9600 IAX(510)988 9673 <br /> Analytical 819 Striker Avenue Suitt 8 Sacramento CA 95834 (9t6) 921 9600 FAX(916)921 OI()o <br /> Iwo <br /> Pac&Environmental Group, Inc Client Project ID Chevron #"258, Stockton, CA <br /> 11315 Sunrise Gold Circle, #M Matrix Soil <br /> Rancho Cordova, CA 95742 <br /> Attention Roger Hoffmore QC Sample Group 6091009-18 Reported Oct 1 1996 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene X enes <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#. LGS092696 LCS092696 LCS092696 LCS092696 <br /> Date Prepared 09/26/96 09/26/96 09/26/96 09/26/96 <br /> Date Analyzed 09/26/96 09/26/96 09/26/96 09/26/96 <br /> Instrument I D # GCHP-1 GCHP-1 GCHP-1 GCHP-1 <br /> • LCS % <br /> Recovery 95 98 99 100 <br /> Control Limits 70.130 70-130 70-130 70-130 <br /> `> A <br /> i <br /> MS/MSD <br /> Batch# 6091012 6091012 6091012 6091012 <br /> Date Prepared 09/26/96 09/26/96 09/26/96 09/26/96 <br /> Date Analyzed, 09/26/96 09/26/96 09/26/96 09/26/96 <br /> Instrument I D #: GCHP-1 GCHP-1 GCHP-1 GCHP-1 <br /> Matrix Spike <br /> %Recovery: 94 96 97 96 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery 94 96 96 96 <br /> Relative% <br /> Difference 00 00 10 00 <br /> SEQUOIA ANALYTICAL Please Note <br /> ` The LCS is a control sample of known interferent free matrix that 1s analyzed using the same reagents <br /> /inca <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/MSD s are adv sory only <br /> C Schn Ider and are not used to accept or reject batch results <br /> Project Manager/Sacramento Labora ory <br /> 6o9i0o9 PES - f 5 <br />