9.2 Interior Hazardous Materials Management (X02), CCA and Lead Management (X03) & Site Remediation (X04)

9.2 Interior Hazardous Materials Management (X02), CCA and Lead Management (X03) & Site Remediation (X04)

Core Exam Takeaway: X02 and X03 are both preconditions, and the split between them is interior versus exterior. X02 handles asbestos, lead paint and PCBs inside existing buildings; X03 handles CCA-treated wood and lead in exterior soil, artificial turf, loose-fill rubber and playground paint. X04 Site Remediation (1 pt / Core 2 pt) is the optimization for contaminated sites. Memorize 1% asbestos, 400 ppm soil lead, and the three-year re-inspection cycle.

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Feature X02: Interior Hazardous Materials Management — Precondition

Intent: manage risks of human exposure to hazardous materials ubiquitously used in past construction practices — specifically asbestos, lead and polychlorinated biphenyls (PCBs).

WELL's framing is stark: exposure to asbestos-containing dust is the main cause of mesothelioma and is responsible for over 200,000 deaths annually; lead accumulates in blood, tissue and bone and impairs intellectual development in children and the unborn; PCBs are persistent, bioaccumulative and carcinogenic, and their production is banned worldwide.

The strategy: evaluate existing buildings for these materials, remove them when technically feasible, and if removal is not possible, isolate and periodically monitor to prevent exposure — while above all avoiding the generation of respirable dust.

X02 Part 1 — Manage Asbestos Hazards

Applies to existing buildings constructed or last renovated before laws banning asbestos-containing materials, and to buildings where no local asbestos phase-out regulation exists.

Option 1: Asbestos risk assessment — one of:

• (a) A project where all asbestos was removed in a prior renovation demonstrates that occupancy of the space is legally allowed.
• (b) An investigation by an inspector certified under local regulation — or a qualified professional with demonstrable experience where no local regulations apply — providing at minimum:
  1. A list of locations where presumed asbestos containing materials (PACM) were found.
  2. Confirmation of asbestos through Polarized Light Microscopy (PLM) or Transmission Electron Microscopy (TEM) testing, with sample number and location per applicable laws or the inspector's recommendation. Materials having over 1% asbestos are considered ACM. If analytical confirmation is not available or possible, all PACM are considered ACM.

Option 2: Asbestos action plan — if ACM were found, implement a plan containing: notification of works to authorities and people living, working or transiting nearby; preventative measures against formation and spread of airborne fibers; worker protection including skin and respiratory protection; and for removal, wetting of all removed ACM, care in transportation to prevent crumbling, sealing and leak-tight transportation, proper labeling and disposal in permitted locations; plus post-remediation clearance.

X02 Part 2 — Manage Lead Paint Hazards

Applies to existing buildings constructed or renovated before laws banning lead-containing interior wall paints.

Option 1: Identify lead paint hazards — one of:

• (a) Where local law mandates full removal before occupancy, demonstrate the risk was addressed with legal documentation such as approved certificates of occupancy or remediation reports.
• (b) An on-site investigation by a certified inspector or qualified professional, covering:
  1. An inventory of locations of potential sources and sinks of lead-containing materials.
  2. Confirmation through in-situ x-ray fluorescence (XRF) or laboratory analysis of paint chips and/or surface dusts. The hazard thresholds:

Lower thresholds mandated by local regulations prevail.

Option 2: Lead action plan — if lead is found, a certified inspector implements a plan containing: notification and access restriction; dust-minimization and worker protection if paints are mechanically removed; a re-inspection schedule including visual assessments and dust testing at least once every three years where lead paint is left in place under stabilization (painted over to prevent chipping) or enclosure; and post-remediation clearance confirming dust lead is below hazardous levels.

X02 Part 3 — Manage Polychlorinated Biphenyl (PCB) Hazards

Applies to buildings constructed or last renovated before applicable PCB bans, or undergoing renovation that disturbs materials likely to contain PCBs — WELL names caulking, fluorescent light ballasts, and capacitors of appliances fabricated before 1980.

• (a) An inspection strategy determining locations where PCB-containing materials may be disturbed, and, if caulk is to be disturbed or removed, analysis following local laws or applicable US EPA or ISO testing methods.
• (b) If PCBs are found in disturbed materials, an action plan with notification, dust-spread prevention and access restriction, worker protection including chemical-resistant gloves, clothing protection, goggles and respirators, and safe disposal in permitted locations.

WELL Core guidance for all three parts: extent of developer buildout.

[!IMPORTANT] Two asbestos numbers, two purposes. X01 Part 1 restricts newly installed products to 1,000 ppm (0.1%) asbestos. X02 Part 1 treats existing materials as ACM above 1%. The new-product threshold is ten times stricter than the legacy-material trigger, because the former is a purchasing decision and the latter is a remediation trigger.

[!TIP] "If analytical confirmation is not available or possible, all PACM are considered ACM" is the precautionary default that makes X02 workable. A project cannot avoid obligations by declining to test — untested presumed materials are treated as hazardous.

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Feature X03: CCA and Lead Management — Precondition

Intent: mitigate risks of human exposure to chromated copper arsenate (CCA) and lead.

X03 Part 1 — Manage Exterior CCA Hazards

Applies to all existing wood structures installed before CCA bans that lie outside the building envelope but within the project boundary where human presence is expected — WELL's examples: wooden decks, fences near walkways, playgrounds and outdoor furniture.

• (a) Identify CCA-containing wood through one of: inspection of purchase records; determination of whether legal bans for CCA apply; or testing for arsenic in the wood or in the soil bearing the wooden structures.
• (b) Address CCA-containing woods through one of:
  1. Dispose following applicable laws, without incinerating nor wood chipping; or
  2. Treatment with penetrating (non-film-forming), oil-based, semi-transparent stains that prevent arsenic leaching, applied regularly per manufacturer recommendation.

[!IMPORTANT] "Without incinerating nor wood chipping" is the operative safety rule. Burning CCA wood volatilizes arsenic into smoke and concentrates it in ash; chipping creates arsenic-laden dust and mulch. And note the stain specification: penetrating, non-film-forming, oil-based, semi-transparent — a film-forming paint would peel and expose the wood again.

X03 Part 2 — Manage Lead Hazards

• (a) Bare soil: the top 0.6 in (1.5 cm) layer of all existing outdoor bare soil (outside the building envelope, post-construction, not covered by grass, vegetation or other landscaping including mulch) is tested for lead, with each continuous area of bare soil sampled at least once. If any sample exceeds 400 ppm by weight:
  1. A second set of samples is taken at 6 in (15 cm), 12 in (30 cm), 18 in (45 cm) and 24 in (60 cm) deep.
  2. If those are also above 400 ppm, soil is replaced from another source to the depth of the deepest sample above the threshold.
• (b) Artificial turf fibers: if lead concentration is unknown, test a sample. If total lead exceeds 136 mg/lb (300 mg/kg), perform dust-wipe testing. If wipe results show total lead loadings greater than 40 µg/ft² (430 µg/m²), replace with turf below 136 mg/lb (300 mg/kg).
• (c) Loose-fill rubber from recycled tires on playgrounds, sporting fields or other surfaces: sample and analyse; if total lead loadings exceed 136 mg/lb (300 mg/kg) of rubber, replace the loose-fill rubber.
• (d) Paint on existing playground equipment installed and painted before banning laws: assess integrity and age; if cracked, peeled or chipped, collect a sample for laboratory lead analysis and remove as necessary.

WELL Core guidance: extent of developer buildout.

[!TIP] 400 ppm is the lead-in-soil number that appears in both X02 Part 2 and X03 Part 2 — one number, two features, interior investigation and exterior testing respectively. And note the escalating depth protocol in X03: a surface exceedance triggers sampling at four defined depths, and replacement extends only as deep as contamination is actually found.

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Feature X04: Site Remediation — Optimization (1 pt / WELL Core 2 pt)

Intent: promote the safer development of potentially contaminated sites by assessing and mitigating hazards.

X04 Part 1 — Assess and Mitigate Site Hazards

Option 1: Environmental site assessment. For sites used for past or present industrial activities — WELL's examples: hazardous waste storage, fuel station, manufacturing plant, on-site dry cleaners, automotive repair or brownfields — complete an assessment of potential contamination in soil or underground water from past uses or surrounding conditions, using either local applicable regulation for environmental site assessments or ASTM E1527-05 (Phase I site assessments).

Option 2: Monitoring and remediation plan. If the investigation establishes potential presence of contaminants:

• (a) A sampling strategy to quantify contamination and determine remediation needs, following local regulations or ASTM E1903-97 (Phase II site assessment).
• (b) A sustainable remediation plan before, during and after construction integrating:
  1. A risk-based approach to sustainable remediation (risk assessment / risk-benefit analysis)
  2. A tiered approach to assessment and an appraisal of remediation options
  3. Safe working practices for workers during remediation
  4. Record keeping of decision-making and assessment processes
  5. A protocol for engaging stakeholders, including management of the impacts on the community

WELL Core guidance: whole building.

[!TIP] Phase I versus Phase II is the distinction to hold. ASTM E1527-05 Phase I is a records and reconnaissance assessment — historical use, adjacent properties, regulatory databases, site walkover — with no sampling. ASTM E1903-97 Phase II is intrusive sampling to quantify what Phase I flagged. X04's two options mirror that sequence exactly, and requirement (b)(5)'s community impact management is the provision that distinguishes WELL's "sustainable remediation" framing from a purely technical clean-up.