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j SEQUOIA ANALYTICAL <br /> 819 Striker Avenue, Suite 8 • Sacramento, CA 95834 <br /> (916) 921-9600 • FAX (916) 921-0100 <br /> Murray&Associates Client Project ID Langston's Market <br /> I 5051 Lexington Circle Matrix Water <br /> Loomis, CA 95650 <br /> Attention Kent Murray QC Sample Goup 3040749-52 Reported Apr 30, 1993 <br /> i k Af n <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene Xylenes <br /> Method EPA 602 EPA 602 EPA 602 EPA 602 <br /> 1Analyst Chiaravalloti Chiaravallob Chiaravalloti Chiaravalloti <br /> Concentration <br /> Spiked 10 10 10 30 <br /> LCS Batch#. LCSO42893 LCSO42893 LC8042893 LCSO42893 <br /> Date Prepared 4/28/93 4/28/93 4/28/93 4/28/93 <br /> Date Analyzed 4/28/93 4/28/93 4/28/93 4/28/93 <br /> Instrument I D # HP-2 HP-2 HP-2 HP-2 <br /> LCS % <br /> Recovery 95 93 90 99 <br /> Control Limits. 80-120 80-120 80-120 e0-120 <br /> I <br /> r <br /> i MS/MSD <br /> Batch #- 3040781 3040781 3040781 3040781 <br /> IDate Prepared 4/28/93 4/28/93 4/28/93 4/28/93 <br /> Date Analyzed 4/28/93 4/28/93 4/28/93 4/28/93 <br /> Instrument LD # HP-2 HP-2 HP-2 HP-2 <br /> Matrix Spike <br /> %Recovery 88 95 92 90 <br />' Matrix Spike <br /> Duplicate % <br /> Recovery 93 100 96 90 <br />' Relative% <br /> Difference 55 51 43 00 <br /> 6 SEQUOIA ANALYTICAL Please Note <br /> The LCS is a control sample of known,interferent free matrix that is analyzed using the same reagents, <br />' W d ich j a <br /> ,� preparation and analytical methods employed for the samples The LCS%recovery data is used for <br /> nyy f U-�� validation of sample batch results Due to matrix effects,the <br /> Wend Amundsen QC Omits for MS/MSD's are advisory only <br /> Wendy and are not used to accept or refect belch results <br /> Laboratory Director <br /> 3040749 MMM <2> <br />