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SAP/QAPP Addendum Lodi-125 N Stockton Final March 24,2025 XRF spectrometer (or similar),an XRF spectrum-analyzing system for quantitative measurement of lead in paint on various substrates.As specified by HUD (2012),XRF screening of suspected LBP will proceed similar to single-family housing inspection protocols with the SL for lead in paint of 5,000 ppm or 0.5 percent by weight.The Viken Pb200iTM XRF spectrometer performance characterization sheet and calibration schedule are in Appendix D. The XRF system is equipped with software that calculates the measurable concentration of lead in paint by correcting for substrate conditions.The software was developed for flat surfaces,and application of the XRF unit to curved,narrow,or metal substrates may result in biased readings that may be interpreted as background rather than low levels of lead in paint.In these instances,a series of confirmation tests can occur to attain greater precision. If,at the conclusion of these XRF confirmation tests,the result is still inconclusive,paint chip samples for laboratory analysis will be collected using a razor knife and chisel.If needed,a heat gun may be used to maximize paint separation from the substrate. Each paint chip sample will be placed into a plastic bag, identified by a unique sample number,and transported under proper chain-of-custody procedures to the NVLAP-accredited laboratory for analysis.Paint chip samples will be analyzed for lead via EPA Method 7000B. Based on the age of the unoccupied office building,an estimated 15 paint chip samples will be collected. Sampling locations and sampling and analytical methods are conveyed in Site-Specific QAPP Worksheet#18. 6.4.3 Caulk Sampling for Polychlorinated Biphenyls The unoccupied office building will be inspected for caulk that may contain PCBs. Caulk samples will be selected for PCB analysis based on the apparent age of the caulk. Samples of caulk for PCB analysis will be collected following EPA guidance and EPA 40 CFR 761.62(b)(4)(ii).The survey will use the EPA benchmark level of 50 ppm for PCBs in materials;therefore. Suspected PCB-containing caulk materials will be grouped if the materials are similar in appearance and texture;however,if the inspector decides a material(for example,associated with a different building construction date) is unique and collect samples of each unique material accordingly.Bulk samples of suspected PCBs will be collected to ensure only the suspect caulk material is represented in the sample.Water will be applied to the material before sample collection to reduce the potential for dust release.All samples collected will be placed in plastic bags,labeled,and sealed immediately upon collection.To limit cross- contamination between samples,the sampling instruments will be wiped clean with a wet,lint-free cloth after collection of each sample.A unique sample identification number will be assigned to each sample.Based on 51