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ACZ Laboratories, Inc. 2773 Downhill Dnve Steamboat Springs, CO 80487 (800) 334 -5493 Re 11 Ott Batch Found Limit Lower LCL MDL PCN /SCN PQL QC Rec RPD Upper UCL Sample A distinct set of samples analyzed at a specific time Value of the QC Type of interest Upper limit for RPD, in % Lower Recovery Limit, in % (except for LCSS, mg /Kg) Lower Control Limit Method Detection Limit Same as Minimum Reporting Limit Allows for instrument and annual fluctuations A number assigned to reagents /standards to trace to the manufacturer's certificate of analysis Practical Quantitation Limit, typically 5 times the MDL True Value of the Control Sample or the amount added to the Spike Amount of the true value or spike added recovered, in % (except for LCSS, mg /Kg) Relative Percent Difference, calculation used for Duplicate QC Types Upper Recovery Limit, in % (except for LCSS, mg /Kg) Upper Control Limit Value of the Sample of interest I le Ty SURR INTS DUP LCSS LCSW LFB Blanks Control Samples Duplicates Spikes/Fortified Matrix B E H J L M P R T U V X Z ( ( (3) (4) (5) merits (1) ( (3) REPINI 1 10 10 01 Surrogate Internal Standard Sample Duplicate Laboratory Control Sample - Soil Laboratory Control Sample - Water Laboratory Fortified Blank LFM LFMD LRB MS /MSD PBS PBW 0rgenic Reference Laboratory Fortified Matrix Laboratory Fortified Matrix Duplicate Laboratory Reagent Blank Matrix Spike /Matrix Spike Duplicate Prep Blank - Soil Prep Blank - Water QC.Sampler =Ty1 Explanations Verifies that there is no or minimal contamination in the prep method or calibration procedure Verifies the accuracy of the method, including the prep procedure Verifies the precision of the instrument and /or method Determines sample matrix interferences, if any. ACS Analyte concentration detected at a value between MDL and PQL The associated value is an estimated quantity Analyte concentration is estimated due to result exceeding calibration range Analysis exceeded method hold time pH is a field test with an immediate hold time Analyte concentration detected at a value between MDL and PQL The associated value is an estimated quantity Target analyte response was below the laboratory defined negative threshold Poor spike recovery is accepted because sample concentration is four times greater than spike concentration Analyte concentration differs from second detector by more than 40% Poor spike recovery accepted because the other spike in the set fell within the given limits High Relative Percent Difference (RPD) accepted because sample concentrations are less than 10x the MDL The material was analyzed for, but was not detected above the level of the associated value The associated value is either the sample quantitation limit or the sample detection limit High blank data accepted because sample concentration is 10 times higher than blank concentration Quality control sample is out of control Poor spike recovery is accepted because sample concentration is four times greater than spike concentration EPA 600/4 -83 -020 Methods for Chemical Analysis of Water and Wastes, March 1983 EPA 600/4- 90/020 Methods for the Determination of Organic Compounds in Drinking Water (I), July 1990 EPA 600 /R- 92/129 Methods for the Determination of Organic Compounds in Drinking Water (II), July 1990 EPA SW -846 Test Methods for Evaluating Solid Waste, Third Edition with Update III, December 1996 Standard Methods for the Examination of Water and Wastewater, 19th edition, 1995 & 20th edition (1998) QC results calculated from raw data. Results may vary slightly if the rounded values are used in the calculations Soil, Sludge, and Plant matrices for Inorganic analyses are reported on a dry weight basis An asterisk in the "XQ" column indicates there is an extended qualifier and /or certification qualifier associated with the result For a complete list of ACZ's Extended Qualifiers, please click' http: / /wtvw acz com /puhlic!cxtquallist pdf Page 25 of 54