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Data Qualifiers and Definitions Qualifiers A See Report Comments. Analyte was present in an associated method blank. B1 Analyte was present in a sample and associated method blank greater than MDL but less than DRL. BQ1 No valid test replicates. Sample Toxicity is possible. Best result was reported. BQ2 No valid test replicates. BQ3 No valid test replicates. Final DO is less than 1.0 mg/L. Result may be greater. Possible laboratory contamination. RPD was not within control limits. The sample data was reported without further clarification. D1 Lesser amount of sample was used due to insufficient amount of sample supplied. D2 Reporting limit is elevated due to sample matrix. Target analyte was not detected above the elevated reporting limit. DW Sample result is calculated on a dry weigh basis. Concentration is estimated because it exceeds the quantification limits of the method. The sample was read outside of the method required incubation period. Reported value is estimated The laboratory control sample (LCS) or laboratory control sample duplicate (LCSD) was out of control limits. Associated sample data was reported with qualifier. The matrix spike (MS) or matrix spike duplicate (MSD) was not within control limits due to matrix interference. The associated LCS and/or LCSD was within control limits and the sample data was reported without further clarification. M1 The matrix spike (MS) or matrix spike duplicate (MSD) is not within control limits due to matrix interference. M2 The matrix spike (MS) or matrix spike duplicate (MSD) was not within control limits. The associated LCS and/or LCSD was not within control limits. Sample result is estimated. N1 Sample chromatography does not match the specified TPH standard pattern. NC The analyte concentration in the sample exceeded the spike level by a factor of four or greater, spike recovery and limits do not apply. Sample was received without proper preservation according to EPA guidelines. P1 Temperature of sample storage refrigerator was out of acceptance limits. P2 The sample was preserved within 24 hours of collection in accordance with EPA 218.6. 01 Analyte Calibration Verification exceeds criteria. The result is estimated. Q2 Analyte calibration was not verified and the result was estimated. 03 Analyte initial calibration was not available or exceeds criteria. The result was estimated. 04 Analyte result out of calibration range. Result was estimated. The surrogate recovery was out of control limits due to matrix interference. The associated method blank surrogate recovery was within control limits and the sample data was reported without further clarification. S1 The associated surrogate recovery was out of control limits; result is estimated. S2 The surrogate was diluted out due to the presence of high concentrations of target and/or non-target compounds. Surrogate recoveries in the associated batch QC met recovery criteria. Sample was extracted/analyzed past the holding time. T1 Reanalysis was reported past hold time due to failing replicates in the original analysis (BOD only). T2 Sample was analyzed ASAP but received and analyzed past the 15 minute holding time. T3 Sample received and analyzed out of hold time per client's request. T4 Sample was analyzed out of hold time per client's request. T5 Reanalysis was reported past hold time. The original analysis was within hold time, but not reportable. T6 Hold time is indeterminable due to unspecified sampling time. T7 Sample was analyzed past hold time due to insufficient time remaining at time of receipt. Definitions DF Dilution Factor MDL Method Detection Limit. Result is reported ND when it is less than or equal to MDL. ND Analyte was not detected or was less than the detection limit. NR Not Reported. See Report Comments. RDL Reporting Detection Limit TIC Tentatively Identified Compounds Enthalpy Analytical, Inc. Analytical Results Report 56893-01 Lab Request 380652, Page 9 of 9