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C H ROMALAB, INC. Submission#: 19994 2-0355 <br /> Environmental Services(SDB) <br /> To: CH2M Hill-Oakland lest Method: 8260A <br /> Attn: Keith Sheets Prep Method: 5030 <br /> Batch QC Report <br /> Volatile Organics by GC/MS-EPA8260A <br /> Laboratory Control Spike(LCS/LCSD) Water <br /> QC Batch#1999!12122-111.27 <br /> LCS: 1999112122-01.27-002 Extracted: 121221199912:59 Analyzed 121221199912:59 <br /> jLCSD: 1999112122-01.27-003 Extracted: 121221199913:47 Analyzed 121221199913:47 <br /> Compound Cone. [ug/L] Exp.Conc. [ug/L lRecovery[*/o:!RPD Ctrl.Limits[%] Flags <br /> LCS' LCSD LCS LCSD LCS LCSD [%] Recovery RPD I LCS LCSD <br /> Benzene 43.8 41.9 50.0 50.0 87.6 83.8 4.4 69-129 20 <br /> Chlorobenzene 54.6 55.9 50.0 50.0 109.2 111.8 2.4 61-121 20 <br /> 1,1-Dichlorcethene 43.8 43.9 50:0 50.0 87.6 87.8 0.2 65-125 20 <br /> Toluene 42.8 42.0 50"0 50.0 85.6 84.0 1.9 70-130 20 <br /> Trichloroethene 41.3 41.1 50.0 50.0 82.6 82.2 0.5 74-134 20 <br /> Surrogate(s) <br /> 4-Bromotiuorobenzene 482 516 500 500 96.4 103.2 86-115 <br /> 1,2-Dichloroethane-d4 507 448 500 500 101.4 89.6 76-114 <br /> Toluene-d8 465 458 500 500 93.0 91.6 88-110 <br /> I <br /> I <br /> f <br /> I <br /> I • <br /> r <br /> 1 .. <br /> 1 <br /> �. 1220 Quarry LanePleasanton,CA 94566-4756 <br /> Telephone:(925)4841919'Facsimile:(925)484-1096 <br /> Printed on:06/01/2000 16:24 Page 7 Of 9 <br /> l <br />