Request for review of monitoring contractor specifications for air sampling, including sampling methodologies, limits of detection, and clearance criteria, with reference to prior…
NYC-WTC_000162815–000162821Folder label: “E-mails 2003 M. Gilsenan”
OCR status: ok · source: pdftotext
NYC 9/11 Public Portal Document
Diun» 2. Post cleaning air samples for fibrous glass and silica shall be collected concurrently with the asbestos clearance air sampling procedures specified herein. Five samples for fibrous glass and one sample for silica shall be collected in each apartment.
3. Wipe samples shall be collected before and after cleaning for lead, dioxin, and PAHs.
Prior to the cleaning activities, three wipe samples shall be collected for each of these parameters in each apartment. The sampling locations shall be a wall, a bare floor, and a counter or tabletop.
After cleaning activities, three wipe samples shall be collected for each of these parameters in each apartment. The sampling locations shall be a wall, a bare floor, and a counter or tabletop; preferably at the same location as the pre-cleaning samples.
4. The required sampling and analytical procedures are specified in Table 1.
Table 1: Sampling and Analytical Methods Parameter Description Sampling Analytical Method Maximum Methodology Turnaround Time Lead Wipe samples HUD Appendix 13.1 EPA Method SW-846-6010B 1 day PAHs Wipe samples ASTM D6661-01 ASTM-6661-01 14 days EPA SW-846-8270C Dioxin Wipe samples ASTM 6661-01 ASTM 6661-01 14 days EPA Method SW-846-8290 Fibrous Glass Air samples NIOSH 7400 NIOSH 7400, 3 days Counting Method “B” Crystalline Air samples NIOSH 7500 NIOSH 7500 (XRD) 14 days Silica
5. The detection limit for PAHs shall be no greater than 2.5(xg/m2.
6. Samples containing concentrations of specific congeneric analytes (PCDDs and PCDFs) considered within the scope of the dioxin sampling method that are greater than ten times the upper MCLs must be analyzed by a protocol designed for such concentration levels, e.g. Method 8280. Analytical results shall be reported using a 2,3,7,8-TCDD toxicity equivalency factor (TEF). All non-detect congeners shall be reported at 50% of the analytical sensitivity, thereby yielding a recalculated TEF.
Asbestos Air Sample Collection and Analysis
I. All asbestos air sampling methodologies shall be in accordance with the applicable sections of Title 15, Chapter 1 of the Rules of the City of New York and AHERA.
2. Asbestos clearance air samples shall be analyzed in accordance with the NIOSH 7400 Method, and analyzed by PCM followed by TEM. The laboratory shall report a PCMe value of all fibers greater than 5 microns in length. Therefore, the lab shall report PCM, TEM and PCMe values for each sample. The detection limit shall be 0.0004 f/cc.
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NYC-WTC_000162818
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NYC-WTC_000162838
Correspondence regarding Schedule A forms and a draft scope of work for cleaning and air monitoring contracts at the site.
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DEP forwards inspection report for 125 Cedar Street along with NYC guidelines on fungal remediation.
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Document tracking the chain of custody for environmental samples collected at 114 Liberty Street on August 22, 2002.
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Technical correspondence addressing asbestos air sampling methodology and pump flow rate specifications.
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NYC-WTC_000162712
Official notice instructing staff to preserve scanned World Trade Center documents as potential evidence in future legal actions.
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NYC-WTC_000162713
Official notice instructing staff not to dispose of original World Trade Center documents as they are required for legal proceedings.
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NYC-WTC_000162729
DEP submits OSHA compliance justification document for review regarding worker safety in WTC cleanup procedures.
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NYC-WTC_000162731
EPA submits detailed technical questions and comments on proposed HVAC cleaning procedures for WTC buildings.
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