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a %ww energylab.com Helena, MT 877-472-0711 • Billings, MT 800-735-4489 • Casper, WY 888-235-0515 <br />_ Ana"W Excellence Shree 1951 Gillette, WY 666-686-7175 a Rapid City, SD 888-672-1225 • College Station, T% 888-690-2218 <br />QA/QC Summary Report <br />Client: Cotter Corporation <br />Project: Schwartzwalder Water Monitoring Program <br />Report Date: 09/14/10 <br />Work Order: C10080305 <br />Analyte Count Result Units RL %REC Low Limit High Limit RPD RPDLimit Qual <br />Method: A3500 Cr-B Analytical Run: HACH DR3000_100817B <br />Sample ID: CCV-5 Continuing Calibration Verification Standard 08/17/10 12:53 <br />Chromium, Hexavalent 0.0971 mg/L 0.010 97 80 120 <br />Method: A3500 Cr-B Batch: A2010-08-17 6 CR 01 <br />Sample ID: C10080305-001AMS Sample Matrix Spike Run: HACH DR3000_100817B 08/17/10 13:03 <br />Chromium, Hexavalent 0.0989 mg/L 0.010 101 80 120 <br />Sample ID: C10080305-001AMSD Sample Matrix Spike Duplicate Run: HACH DR3000_100817B 08/17/10 13:03 <br />Chromium, Hexavalent 0.0998 mg/L 0.010 102 80 120 0.9 20 <br />Qualifiers: <br />RL - Analyte reporting limit. <br />MDC - Minimum detectable concentration <br />ND - Not detected at the reporting limit. <br />Page 7 of 21