| QACode | QAName |
| ANI | Sample results for structural isomers may have contribution from their isomeric pair |
| AUDE | Toxicity test endpoint data of unknown quality |
| AUDW | Water parameter data of unknown quality |
| AWM | Detection limit increased due to dilution prior to final sample volume (not a secondary dilution) |
| AY | Matrix interference suspected |
| B | Analyte found in reagent blank, indicates possible reagent or background contamination |
| BB | Sample > 4x spike concentration |
| BBM | Sample > 2X but less than 4X spike concentration |
| BE | Low surrogate recovery; analyzed twice |
| BFRE | Sample influenced by fire |
| BITR | Insufficient taxonomic resolution to calculate CSCI |
| BLM | Compound unidentified or below the RL due to overdilution |
| BLNO | Low number of organisms, may impact CSCI calculation |
| BNTX | Sample did not contain organisms for taxonomic identification needed to conduct calculations |
| BQC | Taxonomy External Quality Control |
| BRK | Sample not analyzed, sample container broken |
| BRKA | Sample container broken but analyzed |
| BS | Insufficient sample available to follow standard QC procedures |
| BSAL | Sample influenced by saline conditions |
| BSCR | Sample influenced by scour or suspected scour event |
| BT | Insufficient sample to perform the analysis |
| BUCM | Untested or unknown benthic macroinvertebrate collection method |
| BUTP | Sampling conducted during unrepresentative time period for CSCI calculation |
| BV | Sample received after holding time expired |
| BWIM | Portion of upstream tributary watershed for benthic macroinvertebrates is in Mexico |
| BX | Sample stored at improper temperature |
| BY | Sample received at improper temperature |
| BZ | Sample preserved improperly |
| BZ15 | Sample not filtered within 15 minutes |
| C | Pesticide result confirmed using GC/MS- EPA Flag |
| CE | Sample not homogeneous |
| CFA | Conversion factor applied to value to maintain comparability with historic dataset measured using a different digest/extract or analytical method |
| CIN | Value outside confidence interval |
| CJ | Analyte concentration is in excess of the instrument calibration; considered estimated |
| CNP | calibration not performed |
| CQA | Concentration not reported for QA sample only % Recovery or RPD reported |
| CS | QC criteria not met due to analyte concentration near RL |
| CSG | Bacteria result calculated using a subset of grids when the filter is too concentrated |
| CT | QC criteria not met due to high level of analyte concentration |
| CVH | CONTINUING CALIBRATION VERIFICATION HIGH, NO BIAS |
| CVHB | CONTINUING CALIBRATION VERIFICATION HIGH, HIGH BIAS |
| CVL | CONTINUING CALIBRATION VERIFICATION LOW, NO BIAS |
| CVLB | CONTINUING CALIBRATION VERIFICATION LOW, LOW BIAS |
| CZM | project sample was heterogeneous and sample homogeneity could not be readily achieved using routine laboratory practices, therefore RPD was outside the specified acceptance limits |
| D | EPA Flag - Analytes analyzed at a secondary dilution |
| DB | QA results outside of acceptance limits due to matrix effects |
| DF | Reporting limits elevated due to matrix interferences |
| DO | Coelution |
| DRL | Spike concentration is less than RL |
| DRM | Spike amount less than 5X the MDL |
| DS | Batch Quality Assurance data from another project |
| DT | Method detection limit elevated |
| EDTA | EDTA added to Selenastrum capricornutum toxicity test |
| EUM | LCS is outside of control limits |
| F | Sample mistakenly filtered |
| FCL | Field calibration not performed within 24 hours before use |
| FDC | Drift check not acceptable |
| FDI | Field instrument displaced but still deployed in water |
| FDO | Field instrument displaced and removed from water |
| FDP | Field duplicate RPD above QC limit |
| FDR | Dry Channel |
| FDS | Dry Site |
| FEU | Equipment Unavailable |
| FIA | Location was inaccessible to obtain a measurement |
| FIB | Field instrument buried |
| FIF | Instrument/Probe Failure |
| FIO | Field instrument above water level |
| FIP | Field instrument vandalized, fouled, or otherwise in poor condition |
| FLV | Velocity too low to be measured |
| FNM | no documentation of the field measurement collection exists |
| FO | Estimated maximum possible concentration (EMPC) |
| FS | Too Shallow for probe measurement |
| FTD | Location was too deep to obtain a measurement |
| FTT | Water too turbid to measure |
| FUD | Unable to deploy instrument |
| FX | Analyte present in the instrument blank |
| GB | Matrix spike recovery not within control limits |
| GBC | CRM analyte recovery not within control limits |
| GC | Second column confirmation performed |
| GD | secondary column result |
| GIDA | Isotope Dilution Analogue recovery not within control limits |
| GN | Surrogate recovery is outside of control limits |
| GR | Internal standard recovery is outside method recovery limit |
| H | A holding time violation has occurred. |
| H22 | Sample exceeds incubation period of 18-22 hours. |
| H24 | Holding time was > 24 hours for Bacteria tests only |
| H8 | Holding time was > 8 hrs but < 24 hours for Bacteria tests only |
| HH | Result exceeds linear range; concentration may be understated |
| HNO2 | Holding time violation occurred on the NO2 concentration used for NO3 calculation. |
| HR | Post-digestion spike |
| HT | Analytical value calculated using results from associated tests |
| HX | Spike recovery out of limits, but QC batch considered in control |
| IDA | Isotope Dilution Analogue corrected |
| IE | Surrogate not added to this sample |
| IF | Sample result is greater than reported value |
| IL | RPD exceeds laboratory control limit |
| ILM | RSD exceeds control limit |
| ILN | Rlog exceeds control limit |
| ILO | Rlog not calculated because concentration below RL |
| IM | Method does not include this analyte as part of compound list |
| IP | Analyte detected in field or lab generated blank |
| IPRL | Analyte detected in field or lab generated blank, >RL |
| IS | Reporting limit elevated due to pres. of analyte in method blank |
| J | Estimated value - EPA Flag |
| JA | Analyte positively identified but quantitation is an estimate |
| K | Peak detected, but did not meet quantification criteria, value represents estimated maximum concentration |
| LB | Result negatively biased |
| LC | Laboratory Contamination |
| LRJ | Data rejected - Estimated value - EPA Flag, flagged by laboratory |
| LRQ | Data rejected - Based on professional judgement QA/QC protocols were not met, flagged by lab |
| LST | Sample was lost or destroyed |
| M | A matrix effect is present |
| MBM | Method (lab generated) blank missing from batch |
| MBP | Method (lab generated) blank did not go through entire preparation and analytical process |
| MN | Method procedures not followed |
| MOI | No associated % moisture results and therefore should not be compared to dry weight thresholds |
| N | Tentatively Identified Compound |
| NBC | Value not blank corrected |
| NC | Analyte concentration not certifiable in Certified Reference Material |
| NG | The reported result is a negative value |
| NMDL | No Method Detection Limit reported from laboratory |
| None | None - No QA Qualifier |
| NR | Not Recorded |
| NRL | No Reporting Limit reported by the laboratory |
| OA | Analyte over range when run undiluted. Diluted result below PQL |
| OV | Result is averaged |
| P | Evidence analyte present |
| PG | Calibration verification outside control limits |
| PGN | Surrogate recovery is within the lab or method defined acceptance criteria, but is outside of project-specific control limits |
| PI | Primary and confirmation results varied by > than 40% |
| PIL | RPD is within the lab or method defined acceptance criteria, but is outside of project-specific control limits |
| PJ | Result from re-extract/re-anal to confirm original MS/MSD result |
| PJM | Result from re-extract/re-anal to confirm original result |
| PJN | Result from re-extract/re-analysis for QC purposes only |
| PRM | Low survival in toxicity test resulted from test interference due to pathogen-related mortality |
| PUM | LCS recovery is within the lab or method defined acceptance criteria, but is outside of project-specific control limits |
| Q | Questionable result |
| QAX | When the native sample for the MS/MSD or DUP is not included in the batch reported |
| QG | Individual analyte exceedances allowed per NELAC |
| R | Data rejected - EPA Flag |
| RCI | The method detection limit is elevated due to chromatographic interference; MDL is reported as equal to RL |
| RE | Elevated reporting limits due to limited sample volume |
| RLST | Replicate lost or destroyed |
| RMDL | Data rejected - Spike concentration is less than MDL |
| RPV | Sample failed to meet representativeness requirements |
| SC | Surrogate Corrected Value |
| SCR | Screening level analysis |
| SLM | Analyte results for R1 and/or R2 were lower than 10 times the MDL, therefore RPD acceptance limits do not apply |
| TA | Ammonia precision or accuracy exceeds laboratory control limit |
| TAB | Test organisms do not meet the minimum age limit at test initiation |
| TAC | Alternative control used in toxicity statistical analysis |
| TAE | Test organisms exceed age limit at test initiation |
| TAM | Toxicity test organism age at test start is not recorded |
| TC | Conductivity precision or accuracy exceeds laboratory control limit |
| TCF | Alternative control does not meet test acceptability criteria |
| TCI | Conductivity insufficient for test species |
| TCT | Conductivity tolerance exceeded for test species |
| TD | DO precision or accuracy exceeds laboratory control limit |
| TH | Hardness precision or accuracy exceeds laboratory control limit |
| THS | Hydrogen sulfide precision or accuracy exceeds laboratory control limit |
| TK | Alkalinity precision or accuracy exceeds laboratory control limit |
| TMO | Test organisms escaped or are otherwise missing |
| TNC | Too numerous to count |
| TNS | Only neonate counts from surviving adults were used in the analysis |
| TOQ | Number of organisms in a toxicity test do not meet the minimum quantity per replicate at test initiation or an unequal quantity of organisms per replicate is used |
| TP | pH precision or accuracy exceeds laboratory control limit |
| TR | Test conditions not acceptable (temp, light) |
| TS | Salinity precision or accuracy exceeds laboratory control limit |
| TW | Water quality parameters outside recommended test method ranges |
| TWN | Required water quality parameters not measured |
| UJ | Analyte was not detected above the reported sample quantitation limit.Reported quantitation limit is approx. & may not represent the actual limit of quantitation necessary to accurately and precisely measure the analyte in the sample. |
| UKM | Lock mass interference present |
| ULM | Analyte detected in associated bottle blank check |
| UOL | Result determined to be an outlier at the time of data validation |
| UT | Sample value was blank corrected |
| VBB | Sample > 4x spike concentration, flagged by QAO |
| VBT | Insufficient sample to perform the analysis, flagged by QAO |
| VBY | Sample received at improper temperature, flagged by QAO |
| VBZ | Sample preserved improperly, flagged by QAO |
| VBZ15 | Sample not filtered within 15 minutes, flagged by QAO |
| VC | Result was calculated by DMT when not provided for DNQ ResQualCode, value 1/2 distance between MDL and RL, flagged by QAO |
| VCIN | Value outside confidence interval, flagged by QAO |
| VCO | Sample analyte concentration detectable but <5X blank concentration (contamination), flagged by QAO |
| VCQ | analyte concentration >10X blank concentration |
| VCR | Sample analyte concentration >5X blank concentration (True hit), flagged by QAO |
| VCS | QC criteria not met due to analyte concentration near RL, flagged by QAO |
| VD | EPA Flag - Analytes analyzed at a secondary dilution, flagged by QAO |
| VDO | Coelution; flagged by QAO |
| VDRL | Spike concentration is less than RL, flagged by QAO |
| VEDTA | EDTA added to Selenastrum capricornutum toxicity test, flagged by QAO |
| VELB | Lab batch sample quantity exceedes number of samples allowed per batch, flagged by QAO |
| VEUM | LCS/LCM recovery not within control limits, flagged by QAO |
| VFDP | Field duplicate RPD above QC limit;flagged by QAO |
| VFIF | Instrument/Probe Failure, flagged by QAO |
| VFNM | No documentation of the field measurement collection exists, flagged by QAO |
| VFO | Estimated maximum possible concentration (EPMC), flagged by QAO |
| VGB | Matrix spike recovery not within control limits, flagged by QAO |
| VGBC | CRM recovery not within control limits, flagged by QAO |
| VGIDA | Isotope Dilution Analogue recovery not within control limits, Flagged by QAO |
| VGN | Surrogate recovery not within control limits, flagged by QAO |
| VH | Holding time violation occurred, flagged by QAO |
| VH24 | Holding time was > 24 hours for Bacteria tests only, flagged by QAO |
| VH8 | Holding time was > 8 hrs but < 24 hours for Bacteria tests only, flagged by QAO |
| VIL | RPD exceeds control limit, flagged by QAO |
| VILN | Rlog exceeds control limit, flagged by QAO |
| VILO | Rlog not calculated because concentration below RL, flagged by QAO |
| VIP | Analyte detected in field or lab generated blank, flagged by QAO |
| VIPRL | Analyte detected in field or lab generated blank, >RL, flagged by QAO |
| VIU | Percent Recovery exceeds laboratory control limit, flagged by QAO |
| VK | Peak detected, but did not meet quantification criteria, value represents estimated maximum concentration, flagged by QAO |
| VM | A matrix effect is present, flagged by QAO |
| VMBM | Method (lab generated) blank missing from batch, flagged by QAO |
| VMBP | Method (lab generated) blank did not go through entire preparation and analytical process, flagged by QAO |
| VMOI | No associated % moisture results and therefore should not be compared to dry weight thresholds, flagged by QAO |
| VNC | Analyte concentration not certifiable in Certified Reference Material, flagged by QAO |
| VNMDL | No Method Detection Limit reported from laboratory, flagged by QAO |
| VQ | Questionable Result, flagged by QAO |
| VQAX | When the native sample for the MS/MSD or DUP is not included in the batch reported, flagged by QAO |
| VQCA | QA/QC protocols were not met for accuracy, flagged by QAO |
| VQCP | QA/QC protocols were not met for precision, flagged by QAO |
| VR | Data rejected - EPA Flag, flagged by QAO |
| VRCI | The method detection limit is elevated due to chromatographic interference; MDL is reported as equal to RL, flagged by QAO |
| VRDO | Data rejected - Co-elution, flagged by QAO |
| VRIL | Data rejected - RPD exceeds control limit, flagged by QAO |
| VRIP | Data rejected - Analyte detected in field or lab generated blank, flagged by QAO |
| VRIU | Data rejected - Percent Recovery exceeds laboratory control limit, flagged by QAO |
| VRLST | Replicate lost or destroyed, flagged by QAO |
| VRMDL | Data rejected - Spike concentration is less than MDL, flagged by QAO |
| VRVQ | Data rejected - Based on professional judgement QA/QC protocols were not met, flagged by QAO |
| VS | Sample Receipt nonconformance, flagged by QAO |
| VSCR | Screening level analysis, flagged by QAO |
| VTAB | Test organisms do not meet the minimum age limit at test initiation, flagged by QAO |
| VTAC | Alternative control used in toxicity statistical analysis, flagged by QAO |
| VTAE | Test organisms exceed age limit at test initiation, flagged by QAO |
| VTAM | Toxicity test organism age at test start is not recorded, flagged by QAO |
| VTCF | Alternative control does not meet test acceptability criteria, flagged by QAO |
| VTCI | Conductivity insufficient for test species, flagged by QAO |
| VTCT | Conductivity tolerance exceeded for test species, flagged by QAO |
| VTL | Minor deviation in temperature or light, flagged by QAO |
| VTMO | Test organisms escaped or are otherwise missing, flagged by QAO |
| VTNC | Too numerous to count, flagged by QAO |
| VTOQ | Number of organisms in a toxicity test do not meet the minimum quantity per replicate at test initiation or an unequal quantity of organisms per replicate is used, flagged by QAO |
| VTR | Test conditions not acceptable (temp, light), flagged by QAO |
| VTW | Water quality parameters outside recommended test method ranges, flagged by QAO |
| VTWN | Required water quality parameters not measured, flagged by QAO |
| VUKM | Lock mass interference present, flagged by QAO |