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Page 6 of 11 <br /> a/science <br /> Z.-_nvironmental Quality Control - LCS/LCS Duplicate <br /> Ar aboratories, Inc. <br /> Conestoga-Rovers &Associates Date Received: N/A <br /> 19449 Riverside Drive, Suite 230 Work Order No: 10-07-1508 <br /> Sonoma, CA 95476-6955 Preparation: N/A <br /> Method: ASTM D-1946 (M) <br /> Project: Mountain House, Neighborhood C+D,Tracy, CA <br /> Date Date LCS/LCSD Batch <br /> Quality Control Sample ID Matrix Instrument Prepared Analyzed Number <br /> 099-12-872-35 Air GC 55 NIA 07/21110 1007211-01 <br /> Parameter LCS%REC LCSD%REC %REC CL RPD RPD CL Qualifiers <br /> Helium 106 100 80-120 5 0-30 <br /> Hydrogen 109 104 80-120 5 0-30 <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 />