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CHROMALAB, INC. <br /> Environmental SerNces(SDB) <br /> ' April 7, 1999 Submission #: 9904031 <br /> page 2 <br /> ' SECOR CONCORD <br /> Atten: TOM CROSBY <br /> ' Project: LYON INVESTMENTS Project#: 70139-004-02 <br /> Received: April 1, 1999 <br /> ' re: Surrogate report for 8 samples for Volatile Organics by GC/MS <br /> analysis . <br /> Method: SW846 Method 8260A Sept 1994 <br /> ' Lab Run#: 18218 <br /> 235608-1 Spiked blank (BSP) 4-BROMOFLUOROBENZENE 100 74-121 <br /> 235608-1 Spiked blank (BSP) D4-1,2-DICHLOROETHANE 96 . 5 70-121 <br /> ' 235608-1 Spiked blank (BSP) D8-TOLUENE 97 .7 81-111, <br /> 235609-1 Spiked blank duplicate (BSD)4-BROMOFLUOROBENZENE 99 . 5 74-123 <br /> 235609-1 Spiked blank duplicate (BSD)D4-1,2-DICHLOROETHANE 95 . 0 70-121 <br /> ' 235609-1 Spiked blank duplicate (BSD)D8-TOLUENE 96 .1 81-11; <br /> 235610-1 Matrix spike (MS) 4-BROMOFLUOROBENZENE 100 74-123 <br /> 235610-1 Matrix spike (MS) D4-1,2-DICHLOROETHANE 94 .4 70-123 <br /> 235610-1 Matrix spike (MS) D8-TOLUENE 98 .4 81-11' <br /> ' 235611-1 Matrix spike duplicate (MSD)4-BROMOFLUOROBENZENE 101 74-12D <br /> 235611-1 Matrix spike duplicate (MSD)D4-1, 2-DICHLOROETHANE 97 . 5 70-123 <br /> 235611-1 Matrix spike duplicate (MSD)D8-TOLUENE 97. 8 81-11' <br /> ' V053 <br /> QCSURR1229 JIEWE107-Apr-99 U <br /> ' 1220 Quarry Lane • Pleasanton,California 94566-4756 <br /> (925)484-1919 • Facsimile (925)484-1096 <br /> Federal ID#68-0140157 <br />