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Page 21 of 32 <br /> `;!/science <br /> Quality Control - LCS <br /> Knvironmenta/ <br /> L aboratories, Inc. <br /> ERM Date Received: 04/16/14 <br /> 1277 Treat Blvd Suite 500 Work Order: 14-04-1157 <br /> Walnut Creek, CA 94597-7989 Preparation: EPA 3050B <br /> Method: EPA 60108 <br /> Project: PG&E MDI/0242722 Page 3 of 5 <br /> Quality Control Sample ID Type Matrix Instrument Date Prepared Date Analyzed LCS Batch Number <br /> 097-01-002-18281 LCS Solid ICP 7300 04/16114 0411711413:22 1404161-02 <br /> Parameter Spike Added Conc.Recovered LCS%Rec. %Rec.CL ME CL Qualifiers <br /> Antimony 25.00 25.16 101 80-120 73-127 <br /> Arsenic 25.00 24.40 98 80-120 73-127 <br /> Barium 25.00 25.32 101 80-120 73-127 <br /> Beryllium 25.00 24.43 98 80-120 73-127 <br /> Cadmium 25.00 25.75 103 80-120 73-127 <br /> Chromium 25.00 23.51 94 80-120 73-127 <br /> Cobalt 25.00 27.90 112 80-120 73-127 <br /> Copper 25.00 25.98 104 80-120 73-127 <br /> Lead 25.00 25.35 101 80-120 73-127 <br /> Molybdenum 25.00 24.99 100 80-120 73-127 <br /> Nickel 25.00 26.66 107 80-120 73-127 <br /> Selenium 25.00 22.45 90 80-120 73-127 <br /> Silver 12.50 12.47 100 80-120 73-127 d <br /> 0 <br /> Thallium 25.00 26.40 106 80-120 73-127 U <br /> 0 <br /> Vanadium 25.00 24.72 99 80-120 73-127 <br /> Zinc 25.00 25.83 103 80-120 73-127 <br /> Total number of LCS compounds: 16 <br /> Total number of ME compounds:0 <br /> Total number of ME compounds allowed: 1 <br /> LCS ME CL validation result:Pass <br /> RPD:Relative Percent Difference. CL:Control Limits <br /> 7440 Lincoln Way,Garden Grove,CA 92841-1427 - TEL:(714)895-5494 - FAX:(714)894-7501 <br />