Forwarding WTC air monitoring scope for final review, Aug 2002

NYC 9/11 Public Portal Document

Environmental Protection Agency Pt. 763, Subpt. E, App. A operations are within acceptable limits. In develop within the sampling and analysis op­ this way. the quality of the data Is defined erations. A description of these quality con- and the results are of known value. These troVquallty assurance procedures Is summa­ checks and tests also provide timely and spe­ rized in the following Table III: cific warning of any problems which might

TABLE III—SUMMARY OF LABORATORY DATA QUALITY OBJECTIVES

Conformance Unit Operation Freqoengy Exneciation

Sample receiving Review of receiving report Each sample 95% complete Sample custody Review of chain-of-custody record Each sample 95% complete Sample preparation Supplies and reagents On receipt Meet specs, or reject Olid opening size 20 rqieningsZK) grids/lot 100% of 1000 or 1 openmg/sample Special clean area monitoring After cleaning or service Meet specs or reciean Laboratory blank 1 per prep series or 10% Meet specs, or reanalyze series Plasma etch blank I per 20 samples 75% Multiple preps (3 per sample) Each sample One with cover of 15 complete grid sqs.

Sample analysis System duck Each day Each day Alignment check Each day Each day Magnification calibration with low and high Each moiuh or after service 95% stsrtdsrds ED calibration by gold standard Weekly 95% EDS calibration by copier line Daily 95%

Performance check Laboraiory blank (measure of cleanliness) Prep 1 per series «10% Meet specs or lead 1 per 25 samples reanalyze series Replicate counting (measure of precisian) 1 per 100 samples IJ z Poisson Std. Dev. Duplicate analysis (measure of reproducibility) 1 per 100 samples 2 z Poisson Std. Dev. Known samples of typical materials Training and lor com­ 100% (working standards) parison with unknowns Analysis of MBS SRM 1876 and/or RM 8410 I per analyst per year 1J X Poisson Sid. Dev. (measure of accuracy and comparability) Data entry review (data validation and measure Each sample 95% of completeness) Record and verify ID election diffraction pauem 1 per 5 samples 80% accuracy Of structure Calculationsand Hand CfllCulallOT Of SUtORlStcd dstS I per 100 samples 85% data reduction piocednre or indepezxlcnt recakulasion of bond* calculated data

1. When the samples arrive at the labora­ 3. Conduct all sample preparation In a tory. check the samples and documentation clean room environment monitored by lab­ for completeness and requirements before oratory blanks. Testing with blanks must Initiating the analysis. also be done after cleaning or servicing the 2. Check all laboratory reagents and sup­ room. plies for acceptable asbestos background lev­ 4. Prepare multiple grids of each sample. els.

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