EP 1110-1-31
31 Aug 01
inspector/risk assessor shall follow the co mputation methods for determining substrate correction
values provided in the PC Sheet for each respective XRF instrument used during the survey.
When scraping painted surfaces for substrate correction, the lead inspector/risk assessor shall
contain the paint scrapings and dispose of the waste off-site. Wipe the scraped area and any
surrounding area to avoid the release of leaded dust or debris.
For multi- family housing, randomly choose two housing units to collect and calculate substrate
measurements, a nd use those values in all tested units, common areas, and exteriors. If
substrates exist in common areas and exteriors that were not found in the unit interiors, select
two locations from these areas for substrate correction.
The location of the substrate correction for each substrate material shall be indicated on the floor
plans/sketches, and submitted as part of the QA/QC portion of the Lead Inspection/Risk
Assessment Report.
2.2.1.3
Surface Testing Using XRF Measurement
The lead inspector/risk assessor shall test at least one location per testing combination, except for
interior and exterior four-wall combinations comprising the typical room or building exterior,
where four readings shall be taken, one on each wall. The selection of the test location for a
specific testing combination shall be representative of the paint over the areas, which are most
likely to be coated with old paint or lead-based paint coatings. All layers of paint shall be
included and the XRF probe faceplate shall be able to lie flat against the surface at the test
location. If no acceptable location for XRF testing exists for a given testing combination, a
paint-chip sample shall be collected and submitted to the laboratory following the laboratory's
SOP for collecting paint chip samples to determine lead loading per cc of surface area, and
ASTM's Standard Practice for Field Collection of Dried Paint Samples for Lead Determination
by Atomic Spectrometry Techniques (E 1729). All testing locations shall be marked on the floor
plans/sketches and Form 1 (Figure B-1, Appendix B).
2.2.1.4
Classification of XRF Results
The lead inspector/risk assessor shall classify the XRF results as positive, negative or
inconclusive as defined in the XRF instrument's PC sheet. Test results a re positive if they are
greater than the upper boundary of the inconclusive range, negative if they are less than the
lower boundary of the inconclusive range, or inconclusive if in between. The inconclusive range
includes both its upper and lower bounds. All XRF readings and results shall be recorded for
each testing combination tested at the time the readings are taken during and as a part of the
visual assessment on Form 1 (See Figure B-1, Appendix B), compared to the Action and Lead
Hazard Levels in Table A-1 and submitted as an attachment to the Lead Inspection/Risk
Assessment Report. Field -repeated testing shall be accomplished, at no additional cost to the
Government, in accordance with the XRF validation requirements of this SOW.
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