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Page 11 of 19 <br /> alscience <br /> nvironmental Quality Control - Spike/Spike Duplicate <br /> aboratories, Inc. <br /> el <br /> Parsons Date Received: 04/18/09 <br /> 2121 North California Blvd., Suite 500 Work Order No: 09-04-1683 <br /> Walnut Creek, CA 94596-7305 Preparation: EPA 50308 <br /> Method: EPA 82608 <br /> Proiect PG&E TRACY MGP SITE <br /> Date Date MS/MSD Batch <br /> Quality Control Sample ID Matrix Instrument Prepared Analyzed Number <br /> 09-04-1775-1 Aqueous GC/MS X 04/23/09 04/23/09 090423S01 <br /> Parameter MS%REC MSD%REC %REC CL RPD RPD CL Qualifiers <br /> Benzene 96 98 88-118 3 0-7 <br /> Toluene 90 95 87-123 5 0-8 <br /> Ethylbenzene 106 108 70-130 1 0-30 <br /> Methyl-t-Butyl Ether(MTBE) 86 88 71-131 2 0-13 <br /> Tert-Butyl Alcohol(TBA) 107 112 36-168 5 0-45 <br /> Diisopropyl Ether(DIPE) 86 87 81-123 2 0-9 <br /> Ethyl-t-Butyl Ether(ETBE) 89 90 72-126 2 0-12 <br /> Tert-Amyl-Methyl Ether(TAME) 100 104 72-126 4 0-12 <br /> Ethanol 108 114 53-149 6 0-31 <br /> 1,1-Dichloroethene 89 94 70-130 6 0-25 <br /> 1,2-Dibromoethane 123 120 70-130 2 0-30 <br /> 1,2-Dichlorobenzene 114 115 86-116 1 0-8 <br /> Carbon Tetrachloride 89 94 67-145 5 0-11 <br /> Chlorobenzene 109 108 88-118 1 0-7 <br /> Trichloroethene 97 99 79-127 2 0-10 <br /> Vinyl Chloride 73 81 69-129 10 0-13 <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 />