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C H RO MALAB, INC. Submission # 1999-05-1136 <br /> Environmental Services(SDB) <br /> To Aqua Science Engineers, Inc Test Method 8260A <br /> Attn Greg Schramn Prep Method 5030 <br /> Batch QC Report <br /> Volatile Organic Compounds <br /> Laboratory Control Spike (LCSILCSD) Water QC Batch # 1999105119-01 07 <br /> LCS 1999/05/19-01 07-002 Extracted 05/19/1999 09 25 Analyzed 05/19/1999 09 25 <br /> LCSD 1999/05/19-01 07-003 Extracted 05/19/1999 10 04 Analyzed 05/19/1999 10 04 <br /> Compound Conc [ ug/L] Added Recovery% RPD Control Limits % Flags <br /> LCS LCSD Amount LCS LCSD Recovery RPD LCS LCSD <br /> Benzene 52897 52342 500 1058 1047 1 0 69-129 20 <br /> Chlorobenzene 541 92 54672 500 1084 1093 08 61-121 20 <br /> 1,1-Dichloroethene 45946 46452 500 919 929 11 65-125 20 <br /> Toluene 53491 53277 500 1070 1066 04 70-130 20 <br /> Trichloroethene 51406 50701 500 1028 1014 1 4 74-134 20 <br /> Surrogate(s) <br /> 4-Bromofluorobenzene 50301 50068 500 1006 1001 86-115 <br /> 1,2-Dichloroethane-d4 49153 50701 500 983 1014 76-114 <br /> Toluene-d8 52526 52669 500 1051 1053 88-110 <br /> 1220 Quarry Lane' Pleasanton,California 94566-4756 <br /> Telephone (925)484-1919'Facsimile (925)4841096 <br /> Printed on 05/25/1999 08 04 Page 14 of 17 <br />