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STL ChromaLab <br />Environmental Services (CA 1094) <br />To: P.G.& E -Walnut Creek <br />Attn: Bryan Nicholson <br />Batch QC Report <br />TEPH w/ Silica Gel Clean-up <br />Submission M 2001-07-0566 <br />Test Method: 8015M <br />Prep Method: 355018015M <br />Laboratory Control Spike (LCS/LCSD) Soil QC Batch # 2001/07/31-05.10 <br />LCS: 2001/07/31-05.10-002 Extracted: 08/02/200111:03 Analyzed 08/02/200114:02 <br />LCSD: 2001/07/31-05.10-003 Extracted: 08/02/200111:03 Analyzed 08/02/200114:40 <br />Compound <br />Conc. [ mg/Kg ] <br />Exp.Conc. [ mg/Kg ] <br />Recovery [% <br />RPD <br />[%] <br />Ctrl. Limits [%] <br />I Flags <br />LCS <br />LCSD <br />LCS <br />LCSD <br />LCS <br />LCSD <br />Recovery <br />RPD <br />LCS <br />LCSD <br />Diesel <br />34.1 <br />33.6 <br />41.7 <br />41.7 <br />81.8 <br />80.6 <br />1.5 <br />60-130 <br />25 <br />Surrogate(s) <br />o-Terphenyl <br />21.9 <br />22.4 <br />20.0 <br />20.0 <br />109.5 <br />112.0 <br />60-130 <br />1220 Quarry Lane' Pleasanton, CA 94566-0756 <br />Telephone: (925) 4841919 • Facsimile: (925) 484.1096 <br />Printed on: 08/02/2001 16:32 Page 5 of 6 <br />