EPA review letter, 133-135 Greenwich Street

NYC 9/11 Public Portal Document

Part II - Environmental Community Monitoring Plan 133-135 Greenwich & 21-23 Thames Streets Airtek Project 05-0701— Rev 2 September 16, 2005

o Quarterly audits: The IH Quality coordinator using a different calibrator and different gas standards (or a different photometer) notes the monitoring system's response to multiple concentrations. Normally, this is done quarterly for each monitor. • Data audit: Airtek Data Manager (not the operator of the monitoring system in question) verifies the highest and one random hourly reading each day for each parameter, and reviews all the data for anomalies. 4.0 DATA REPORTS

Instrumental data will be collected and stored in accordance with the instrument manufacturer's operations manual. Raw data (both chemical and meteorological) will be electronically stored and compiled in a manner that will facilitate computation of average concentrations. Accurate working files of all documentation, including logbooks, original data, calculations, deviations from approved procedures, and data review and validation, will be maintained by the Airtek data Manager.

The laboratories shall provide all deliverables in a format that will allow ready compilation and assessment of the data, as appropriate. The laboratory will report all quality control sample results for each batch of samples. The laboratory will not know which samples are duplicates and will report them as primary samples. Data for all samples will be provided with a copy of the Chain of Custody form. For each record sample, the laboratory report will include, at a minimum: • Sample identification number assigned by the field sampling team; • Date the sample was collected; • Date the sample was extracted; • Date the sample was analyzed; • List of all target analytes for the method that lists the following data for each target analyte: • quantity (concentration) found in sample, • units of measure (e.g., micrograms per liter, milligrams per kilogram), • detection limit and reporting limit with unit of measure, • analytes reported below detection limit, etc.; and • Non-conformance summary identifying any known failure to comply with the QAPP or Sampling and Analysis Plan such as the following: • exceeded holding times, • failure to achieve required detection limits, • poor surrogate recovery or poor duplicate precision, • unidentified samples or custody forms, broken custody seals, and uncalibrated or improperly calibrated instruments.

4.1 Laboratory Reports and Chain of Custody Forms

The laboratory will send copies of reports, including data validation documentation to the Airtek QA Officer and a copy to the Airtek Project Manager for the project files. These reports will include a copy of the Chain of Custody form. The laboratory will retain a copy of all data reports and Chain of Custody forms.

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NYC-WTC 000134259