CT DEP Reasonable Confidence Protocols. Glen Breland, VP Member CT DEP QA/QC Workgroup

Transcription

1 CT DEP Reasonable Confidence Protocols Glen Breland, VP Member CT DEP QA/QC Workgroup

2 Reasonable Confidence Protocols (RCPs) Overview Why develop the RCPs? What are the RCPs? What is Reasonable Confidence? What methods are affected? Some method highlights Lab Certification & Project Planning forms When does this take affect?

3 Reasonable Confidence Protocols (RCPs) Overview Why develop the RCPs Ensure known & documented data quality

4 Reasonable Confidence Protocols (RCPs) Overview What are the RCPs? Specific performance criteria for labs to follow Calibration, QC, Reporting Guidance on remedial action Based on the MCP model

5 Reasonable Confidence Protocols (RCPs) Overview What is Reasonable Confidence? Phrase implies that data reviewer can have confidence the lab has followed a set of guidelines which will generate data of consistent quality. Lab will certify this fact. Reasonable Confidence will form the basis for the data reviewer to asses usability Narratives are critical elements in assessing usability

6 CT RCP Methods 8260 Volatiles by MS 8270 Semi Vol by MS Pesticides PCB Herbicides 8021 Volatiles by GC Some air methods TO 14 TO 15 TO 17 CT ETPH Petroleum Mass Methods for EPH & VPH Will soon be released 6010 Metals by ICP 6020 Metals by ICP/MS 7470/ Mercury 7000 Series Metals by AA 9010/9012/ Cyanide Hex Chrome SPLP & TCLP

7 RCP Methods Overview Standard analyte lists RL equal to lowest cal standard ICP exception (check standard at RL) B flag required ( E flag can be used) Batch MS/MSD not reported TICs only done on client request, except drinking water

8 RCP Methods Overview Results below RL reported as ND Specific list of report deliverables Dilutions of highest analyte in upper 60% of cal curve Soil/sediments on dry weight basis

9 RCP Method Performance Table

10 CT RCP Forms Pre-Project Planning Form Lab Certification Form 7 Questions

11 RCP Laboratory Certification Form

12 Important Dates CT DEP Policy letter Samples collected after Sept 1, 2007 Must follow RCPs or prove equivalency Soil preservation requirement: 5035 March 1, 2006 All soils collected after this date must follow the guidance document for collection and preservation of soils for volatile analysis

13 Evaluating Data Usability Data of known quality should be used to support decisions that relate to a site s data quality objectives (DQO) or the original intended purpose of obtaining the data How do we know the quality of the data? QUALITY CONTROL INFORMATION

14 Quality Control Information Why Do I Need It? Because we don t know the sample s true value or what s in the jar We Do Know (or we are just learning) That: All measurement systems have bias Bias can be negative or positive from the true value Bias can be attributed to many factors Sample related Measurement related

15 Quality Control Information What is a matrix spike and how does it differ from a surrogate spike and why do I care? Why are duplicates important? Do I really need a trip blank and when I get it what does it tell me? Why does the lab report include a laboratory control sample (LCS)? How do I use all of the above to evaluate if the data is usable?

16 Basic QA/QC Concepts Quality Assurance (QA) is a set of general principles designed to establish the reliability of (in this case) a measurement system. Precision, accuracy and sensitivity are several of these principles Quality Control (QC) defines the specific tools which are used to achieve this measurement reliability. Duplicates and spikes are two of these tools

17 SURROGATES DETECTION LIMITS METHOD BLANKS DUPLICATES MATRIX SPIKES

18 Quality Assurance Principles Precision Accuracy Representativeness Completeness Comparability Sensitivity

19 Applying Concepts Understanding QA concepts is key to performing a data usability assessment Precision: duplicates Accuracy: recoveries, blanks Sensitivity: methods, matrix issues, DQOs, regulatory criteria

20 Connecticut DEP RCP Summary Standardized Methods The RCPs Some labs require you specifically request these methods Must be performed for samples collected after September 1, 2007 (or prove equivalency) Reasonable Confidence Data Usability