40 CFR Part 58 Appendix A (Quality Assurance Requirements):

" Each monitoring organization is required to implement a qualit y system that provides sufficient information to assess the qualit y of the monitoring data. The qualit y system must, at a minimum, include the specific requirements described in this appendix of this subpart. Failure to conduct or pass a required check or procedure; or a series of required checks or procedures, does not by itself invalidate datafor regulator y decision making. Rather , monitoring agencies and EPA shall use the checks and procedures required in this appendix in combination with other data quality information, reports, and similar documents showing overall compliance with part 58. Accordingly, EPA and monitoring agencies shall use a "weight of evidence " approach when determining the suitability of data for regulatory de c isions. The EPA reserves the authority to use or not use monitoring data submitted by a monitoring organization when making regulatory decisions based on the EPA IS assessment of the qualit y of the data. Generally, consensus built validation templates or validation criteria alread y approved in Qualit

y Assurance Project Plans (QAP Ps) should be used as the basis for the weight of ev idence approach "

Validation Templates follow "Weight of Evidence" Paradigm! Critical Criteria - observations that do not meet each and every criterion on the critical criteria table should be invalidated unless there are compelling reason and justification for not doing so. The sample or group of samples for which one or more ofthese criteria are not met is invalid until proven otherwise. The cause of not operating in the acceptable range for each of the violated criteria must be investigated and minimized to reduce the likelihood that additional samples will be invalidated . As indicated the zero/span/ precision checks are the only QC checks identified in this category. Operational Evaluations- criteria that are important for maintaining and evaluating the quality of the data collection. Violation of a criterion or a number of criteria may be cause for invalidation. The decision maker should consider other quality control information that mayor may not indicate the data are acceptable for the parameter being controlled . Therefore, the sample or group of samples for which one or more of these criteria are not met is suspect unless other quality control information demonstrates otherwise. The reason for not meeting the criteria must be investigated , mitigated or justified. Systematic Issues - criteria which are important for the correct interpretation of the data but do not usually impact the validity of a sample or group of samples .

1 From Appendix 0 of QA Handbook for A i r Pollution Measurement Systems Vol II Ambient Air Quality Monitoring ProgramPartial Validation Template for S02 1) Requirement 2) Frequency 3) Acceptance Criteria Information /Action CRITICAL CRITERIA- S02 1 and 2) 40 CFR Part 58 AQQ A See 3 . 2 One Point QC C

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yze r difference) Part 58 App A See 2 . 3.1 . 2 QC Check Cone range 0.01

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~ 'r.}1 oA~rli' ~ ~ ~ll"" , a,," SYSTEMATIC CRITERIA- S02 Meets requirements listed I) 40 CFR Part 58 App C Section 2 . 1 2)NA Sampler / Monitor NA in FRM / FEM designation 3) 40 CFR Part 53 & FRMlFEM method list Standard Reporting All data ppb (final units inAQS) 1 , 2 and 3) 40 CFR Part 50 App T See 2 (c) Units Rounding 1 place after decimal with 1 , 2 and 3) 40 CFR Part 50 App T See 2 (c) convention for data All data digits to right truncated reported to A QS