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j SEQUOIA ANALYTICAL <br /> 680 Chesapeake Drive • Redwood City, CA 94063 <br /> (415) 364-9600 FAX(415) 364-9233 <br /> /M1 . v.w v r ux t .u.uv r . v n t . v uti♦ � h�v <br /> RESNA 'A " hx' Client Project ID W0327 00, Knowles Property <br /> 1710 Main Street Matrix Water n <br /> Escalon, CA 95320 <br /> Attention John Lane QC Sample Group 3116301-7 Reported Sep 15, 1993 `2 <br /> ' ; „ ... . .,,,....,..v ..,. , .. .. •0-r%`� v`�' Y ��''K r°'r'`,K <br /> DUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene Xylenes <br /> Method: EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst: P Madden P Madden P Madden P Madden <br /> Conc. Spiked: 10 10 10 15 <br /> Units: ug/L u9/L u9/L ug/L <br /> LCS Batch# BLK091M BLK091393 BLK091393 BLK091393 <br /> 1 <br /> Date Prepared* 9/13/93 9/13/93 9/13/93 9/13/93 <br /> Date Analyzed: 9/13/93 9/13/93 9/13/93 9/13/93 <br /> Instrument I D #: GCHP-1 GCHP-1 GCHP-1 GCHP-1 <br /> LCS % <br /> Recovery: 104 109 106 104 <br /> Control Limits: 81-113 92-121 97-121 90-112 <br /> MS/MSD <br /> Batch# BLK091393 BLK091393 BLK091393 BLK091393 <br /> Date Prepared: 9/13/93 9/13/93 9/13/93 9/13/93 <br /> Date Analyzed: 9/13/93 9/13/93 9/13/93 9/13/93 <br /> Instrument I.D #: GCHP-1 GCHP-1 GCHP-1 GCHP-1 <br /> Matrix Spike <br /> %Recovery 109 116 115 107 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery' 106 114 113 104 <br /> Relative% <br /> Difference 2 8 17 1 8 28 <br /> SEQUOIA ANALYTICAL Please Note <br /> The LCS is a control sample of known,interferent free matrix that is analyzed using the same reagents, <br /> �Vn <br /> preparation and analytical methods employed for the samples The LCS%recoverydata is used for <br /> validation of sample batch results Due to matrix effects,the QC limits for MS/MSG's are advisory only <br /> and are not used to accept or reject batch results <br /> Vickie Tague <br /> Project Manager 3116301 wAT 0> <br />