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r <br /> Sequoia 680 Clicsapeakc Drivc kcdwood C,ty CA 94063 (4 15) 364 9600 rAX(4 t5) 364 9133 <br /> 4o4 N Wiget Lanc Walnut Crcck CA 94598 (510) 988 9600 VAX(5 W)988 9673 <br /> Analytical 8 t9 Stnkcr Mcnue Suttc 8 Sa[ramcnto CA 95934 (916) 921 9600 VAX(916)921 0100 <br /> Pacific E=nvironmental Group, Inc Client Project Ib Chevron #9-6258, Stockton, CA <br /> 11315 Sunrise Gold Circle, #M Matrix Sad <br /> Rancho Cordova, CA 95742 Reported Oct 1 1996 <br /> Attention Roger Hoffmore QC Sample Group 6091009-18 P <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTR <br /> Chromium Nickel Arsenic Vanadium <br /> Method EPA 6010 EPA 6010 EPA 6010 EPA 6010 <br /> Analyst K Barta K Barta K Barta K Barta <br /> Concentration <br /> Spiked 50 mg/kg 50 mg/kg 50 mg/kg 50 m9/kg <br /> LCS Gatch# LCS092596 LCS092596 LCS092596 LCS092596 <br /> Date Prepared 09/25/96 09/25/96 09/25/96 09/25/96 <br /> Date Analyzed 09/30/96 09/30/96 09/30/96 09/30/96 <br /> Instrument LD# lCP-1 ICP-1 ICP-1 ICP-1 <br /> LCs% <br /> Recovery 96 95 92 92 <br /> Control Limits 80.120 8x-120 80-120 80-120 <br /> MS/MSD <br /> Batch # 6091018 6091018 6091018 6091018 <br /> Date Prepared 09/25/96 09/25/96 09/25/96 09/25/96 <br /> Date Analyzed 09/30/96 09/30/96 09/30/96 09/30/96 <br /> Instrument l D # 1CP-1 lCP-1 ICP-1 ICP-1 <br /> Matrix Spike <br /> %Recovery 78 7s 66 7a <br /> Matrix Spike <br /> Duplicate% <br /> Recovery 76 80 7s <br /> Relative% <br /> Difference 26 5 1 3 0 1 3 <br /> Please Note <br /> The LCS is a control sample of known interferent free matrix that is analyzed using the same reagents <br /> S>"GIUOIA ANALYTICAL preparation <br /> al m <br /> or <br /> dation of samplebatch resultsDueto meamoxreffectsthe thQC samples m is fa MrS/MSDsecovery dare advisory is used Only <br /> vOnly <br /> (/�nel <br /> � and are not used to acce 1 ar re ect batch results <br /> Linda C der <br /> Project Manager/Sacramento Laboratory 6091009 PES , 18- <br />