WTC indoor dust cleaning scope of work draft comments

NYC 9/11 Public Portal Document

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8. Pre-cleaning and Post-cleaning Wipe Sampling Procedures How does this section relate to Sections 3. f and g above? It looks like we are saying to monitor a set of residences where tto clean up will occur and that is what Section 3 is all about. If so, the title for Section 3 should reflect that, e.g., Sampling Of Residences That Will Not Be Cleaned. Then Section 4 should be titled something like, Sampling Of Residences That Will Be Cleaned., followed by a statement that the directions in Section 3 will be followed for these residences with the exception of sections f and g for which sections a and b should be substituted?

a.The Project Monitor will collect pre-cleanup and posteleanup; des at 5 percent of the residences cleaned up to a maximum of 50 units per q as inst vEPA. ■»>, , Unitsand . ■ quadrants should be defined. Why are only 5 % being sampl3 rafter than me 0 as done in Section

3? Is tins because the set of cleaned residences is much larger than that of the residences that wiffnot be cleaned? What are the criteria for selection? This si wi consist of the collection of 3 pre clean-up and 3 post clean-up wipe samples for dioxin, total mei s and mercury (Note: a" separate wipe sample is required for each parameter). Metals and mercu wipe samples will be collected in accordance with procedures specified in HUD Appendix 13.1. Dioxin wipe samples will be collected in accordance with the procedures specified in ASTMD 6661-01. What are the criteria for selecting 5% of the residences?

b. The contractor shall docum^^Oie necessary infonnation regarding sampling activities, fill out all fieh^gs, sheets, and^hain-of-custody forms. The contractor shall use F2L sainple and chain-of-custody documentation. Samples must be labeled and accompanied with co»leted chain-of-custody forms before shipping to the designated laboratory, 'yjf' label must include the EPA Project Tracking Number. Samples wi 11 '’C packed, scaled and hand-delivered for analysis ^to EMSL laboratories at: 307 W. 3^* St., New York, New York 212-290-0051. Ml! ils stunples will be analyzed using EPA Method SW-846 6010B. Mercury ' samjdes will be anal^^zed u.sing HPA Method SW-846 7471 A.

Deliverables

The Project Mbi • shall review all deliverables prior to submission to EPA. The review assure that h deliverable is accurate and complete, technically sound, and free of clerical errors.

The Project Mo. shall complete chain-of-custody forms and record the number of wipe .samples, EPA Project Tracking Numbers, the laboratory address, date, and sample IDs in an agreed upon electronic format or website approved by EPA within 24 hours of activity.

9. The Monitoring contractor shall evaluate all HVAC systems in all residential buildings where cleaning will take place to determine if these systems have been impacted by dust or debris from the collapse of the World Trade Center and if these systems require cleaning. This evaluation should occur prior to any of the residence. In cases where cleaning is requested for a whole building, the building’s HVAC system will be evaluated as a whole. In cases where cleaning is requested for an individual residential unit, portions of the HVAC system

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