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6 <br /> Curtis &Tompkins.Ltd. <br /> Q C B a t c h R e p o r t <br /> Client: Treadwell & Rollo, Inc. Laboratory Login Number: 104953 <br /> Project Name: Manteca Site Report Date: 06 Sentember 91 <br /> Project Number: 1107A <br /> ANALYSIS: Hydrocarbon Oil & Grease (Gravimetric) QC Batch Number: 2556 <br /> Blank Results <br /> Sample ID Result MDL Units Method Date Analyzed <br /> BLANK ND 5 mg/L SMWW 17:552OBF 04-SEP-91 <br /> Spike/Duplicate Results <br /> Sample ID Recovery Method Date Analyzed <br /> BS 848 SMWW 17:552OBF 04-SEP-91 <br /> BSD 868 SMWW 17:552OBF 04-SEP-91 <br /> Control Limits <br /> Average Spike Recovery 858 808 - 1208 <br /> Relative Percent Difference 3.28 < 208 <br />