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' Page 15 of 24 <br /> a/ cience <br /> Aw nvironmental Quality Control - Spike/Spike Duplicate <br /> mw aboratories, Inc. <br /> Kiff Analytical Date Received: 02/06/07 <br /> 2795 2nd Street, Suite 300 Work Order No: 07-02-0255 <br /> Davis, CA 95616-6593 Preparation: EPA 3005A Filt. <br /> Method: EPA 60108 <br /> Project Unocal Op Unit <br /> QualityCDate Date MS/MSD Batch <br /> ontrol Sample ID Matrix Instrument Prepared Analyzed Number <br /> 07-02-0249-23 Aqueous ICP 3300 02/06/07 02/07/07 070206506 <br /> Parameter MS%REC MSD%REC %REC CL RPD RPD CL Qualifiers <br /> Antimony 96 91 72-132 5 0-10 <br /> Arsenic 105 102 80-140 2 0-11 <br /> Beryllium 105 101 89-119 5 0-8 <br /> Cadmium 104 102 82-124 2 0-7 <br /> Chromium 104 102 86-122 2 0-8 <br /> Copper 98 97 78-126 1 0-7 <br /> Lead 104 99 84-120 5 0-7 <br /> Nickel 108 103 84-120 4 0-7 <br /> Selenium 106 101 79-127 5 0-9 <br /> Silver 104 103 86-128 1 0-7 <br /> Thallium 112 108 79-121 4 0-8 <br /> ' Zinc 109 106 89-131 3 0-8 <br /> RPD-Relative Percent Difference, CL-Control Limit <br /> ' 7440 Lincoln Way, Garden Grove, CA 92841-1427 . TEL:(714) 895-5494 FAX: 714 894-7501 <br />