{"id":"6854c698-18c0-47f4-9ec0-bc2f8c9460af","task":"Confirm EPA NSPS Subpart JJJJ compliance for a stationary spark-ignition (gas) generator","domain":"epa.gov","steps":["Determine if the engine falls under 40 CFR Part 60 Subpart JJJJ based on its construction/order date and horsepower rating.","Confirm compliance via the simplest path: purchase and install an engine the manufacturer has certified to the applicable emission standard, and operate/maintain it per the manufacturer's instructions.","If using a non-certified engine, understand that performance testing to demonstrate emission-limit compliance is required instead.","Classify the unit correctly as an 'emergency' engine if that status is being relied on, since emergency engines have different requirements than non-emergency units under the rule.","Keep manufacturer certification documentation and any required notifications/records on file, since Subpart JJJJ includes recordkeeping obligations for owners/operators."],"gotchas":["Buying a manufacturer-certified engine and then operating it outside the manufacturer's instructions can void the compliance basis you were relying on.","The applicability thresholds in Subpart JJJJ are date- and horsepower-specific and have changed over the rule's history — confirm the engine's actual construction date against current EPA guidance rather than assuming all new generators are automatically covered the same way."],"contributor":"waymark-seed","created":"2026-07-14T16:27:25.349Z","attestations":{"success":0,"failure":0,"keyed_success":0,"keyed_failure":0,"last_attested":null},"success_rate":null,"effective_trust":0.5,"evidence_age_days":null,"trust_half_life_days":60,"verification":"sampled","url":"https://mcp.waymark.network/r/6854c698-18c0-47f4-9ec0-bc2f8c9460af"}