Forwarding WTC air monitoring scope for final review, Aug 2002

NYC 9/11 Public Portal Document

Environmental Protection Agency n. 763, Subpt. E, App. A and all identifying numbers or marks, sam­ 4. Ensure that the samples are stored in a pling data, shipper’s name, and contact in­ secure and representative location. formation. For each sample set. designate 5. Ensure that mechanical calibrations which are the ambient samples, which are from the pump will be minimized to prevent the abatement area samples, which are the transferral of vibration to the cassette. field blanks, and which is the sealed blank if 6. Ensure that a continuous smooth flow of sequential analysis is to be performed. negative pressure is delivered by the pump 5. Hand-carry samples to the laboratory in by installing a damping chamber if nec­ an upright position if possible: otherwise essary. choose that mode of transportation least 7. Open a loaded cassette momentarily at likely to Jar the samples in transit. one of the indoor sampling sites when sam­ 6. Address the package to the laboratory pling is initiated. This sample will serve as sample coordinator by name when known an Indoor field blank. and alert him or her of the package descrip­ 8. Open a loaded cassette momentarily at tion. shipment mode, and anticipated arrival one of the outdoor sampling sites when sam­ as part of the chain of custody and sample pling is initiated. This sample will serve as tracking procedures. This will also help the an outdoor field blank. laboratory schedule timely analysis for the 9. Carry a sealed blank into the field with samples when they are received. each sample series. Do not open this cassette in the field. D. Quality Control/Quallty Assurance 10. Perform a leak check of the sampling Procedures (Data Quality Indicators) system at each Indoor and outdoor sampling Monitoring the environment for airborne site by activating the pump with the closed asbestos requires the use of sensitive sam­ sampling cassette in line. Any flow indicates pling and analysis procedures. Because the a leak which must be eliminated before Initi­ test is sensitive, it may be Influenced by a ating the sampling operation. variety of factors. These include the supplies 11. Ensure that the sampler Is turned up­ used In the sampling operation, the perform­ right before Interrupting the pump flow. ance of the sampling, the preparation of the 12. Check that all samples are clearly la­ grid from the filter and the actual examina­ beled and that all pertinent information has tion of this grid in the microscope. Each of been enclosed before transfer of the samples these unit operations must produce a prod­ to the laboratory. uct of defined quality if the analytical result E. Sample Receiving Is to be a reliable and meaningful test result. Accordingly, a series of control checks and 1. Designate one individual as sample coor­ reference standards is performed along with dinator at the laboratory. While that Indi­ the sample analysis as indicators that the vidual will normally be available to receive materials used are adequate and the oper­ samples, the coordinator may train and su­ ations are within acceptable limits. In this pervise others in receiving procedures for way. the quality of the data Is defined, and those times when he/she is not available. the results are of known value. These checks 2. Adhere to the following procedures to and tests also provide timely and specific ensure both the continued chain-of-custody warning of any problems which might de­ and the accountability of all samples passing velop within the sampling and analysis oper­ through the laboratory: ations. A description of these quality con- a. Note the condition of the shipping pack­ trol/quallty assurance procedures is summa­ age and data written on it upon receipt. rized in the text below. b. Retain all bills of lading or shipping 1. Prescreen the loaded cassette collection slips to document the shipper and delivery filters to assure that they do not contain time. concentrations of asbestos which may inter­ c. Examine the chaln-of-custody seal. If fere with the analysis of the sample. A filter any. and the package for its Integrity. blank average of less than 18 s/mm^ in an d. If there has been a break in the seal or area of 0.057 mm^ (nominally 10 200-mesh grid substantive damage to the package, the sam­ openings) and a maximum of 53 s/mm’ for ple coordinator shall immediately notify the that same area for any single preparation is shipper and a responsible laboratory man­ acceptable for this method. ager before any action is taken to unpack 2. Calibrate sampling pumps and their flow the shipment. indicators over the range of their Intended e. Packages with significant damage shall use with a recognized standard. Assemble the be accepted only by the responsible labora­ sampling system with a representative fil­ tory manager after discussions with the cli­ ter—not the filter which will be used in sam­ ent. pling—before and after the sampling oper­ 3. Unwrap the shipment In a clean. ation. uncluttered facility. The sample coordinator 3. Record all calibration information with or his or her designee will record the con­ the data to be used on a standard sampling tents. Including a description of each item form. and all identifying numbers or marks. A

687

NYC-WTC_000139302