data/tasks/task_easy.json

{
  "task_id": "EASY-001",
  "difficulty": "easy",
  "max_steps": 15,
  "claim": "EPA testing revealed dangerous lead contamination in Millbrook's water supply at 150 parts per billion, ten times above the federal safety limit.",
  "ground_truth": {
    "gt_verdict": "false",
    "gt_mutation_type": "distortion",
    "gt_mutation_doc_id": "DOC-0003",
    "gt_provenance_chain": ["DOC-0001", "DOC-0002", "DOC-0003"],
    "gt_timeline": ["DOC-0001", "DOC-0002", "DOC-0003", "DOC-0004"],
    "gt_conflict_fields": []
  },
  "corpus": [
    {
      "doc_id": "DOC-0001",
      "title": "EPA Region 4 Water Quality Assessment — Millbrook Municipal Supply",
      "source": "epa.gov",
      "reliability_tier": 1,
      "timestamp": 1709251200,
      "tags": ["water", "lead", "epa", "official", "testing"],
      "snippet": "Routine testing found lead levels at 18 ppb in Millbrook municipal water supply, slightly above the 15 ppb action level.",
      "content": "EPA REGION 4 — WATER QUALITY ASSESSMENT REPORT. Facility: Millbrook Municipal Water Authority. Date of Sampling: February 22-26, 2024. Summary: Routine compliance monitoring under the Lead and Copper Rule (LCR) identified lead concentrations at the 90th percentile of 18 parts per billion (ppb) in residential tap samples from the Millbrook distribution system. This exceeds the EPA action level of 15 ppb by 3 ppb. Under LCR requirements, the Millbrook Water Authority must: (1) notify the public within 30 days, (2) implement corrosion control treatment optimization, and (3) conduct follow-up monitoring within 6 months. For context, the 18 ppb reading represents a marginal exceedance. The maximum contaminant level goal (MCLG) for lead is 0 ppb, but the action level trigger at 15 ppb is an operational threshold, not a health emergency declaration. No immediate health advisory has been issued. Residents are advised to run cold water taps for 30 seconds before use as a standard precaution."
    },
    {
      "doc_id": "DOC-0002",
      "title": "Millbrook Herald: City Water Tests Show Slightly Elevated Lead",
      "source": "millbrookherald.com",
      "reliability_tier": 2,
      "timestamp": 1709337600,
      "tags": ["water", "lead", "local news", "millbrook"],
      "snippet": "Millbrook water tests show lead at 18 ppb, slightly above the EPA action level of 15 ppb.",
      "content": "Millbrook's municipal water supply has tested at 18 parts per billion for lead, slightly above the Environmental Protection Agency's action level of 15 ppb, according to a report released yesterday. The city's Water Authority director, James Thornton, said the results require the city to optimize its corrosion control treatment but stressed that 'this is a marginal exceedance, not a crisis.' The EPA report noted that no immediate health advisory was necessary. Thornton said the city would flush hydrants in the oldest sections of the distribution system and offer free lead testing kits to residents in homes built before 1986, which are more likely to have lead service lines. The follow-up testing is scheduled for August."
    },
    {
      "doc_id": "DOC-0003",
      "title": "Millbrook Watchdog: BREAKING — EPA Finds DANGEROUS Lead Levels in City Water",
      "source": "millbrookwatchdog.com",
      "reliability_tier": 3,
      "timestamp": 1709424000,
      "tags": ["water", "lead", "contamination", "danger", "breaking"],
      "snippet": "EPA finds dangerous lead levels at 150 ppb in Millbrook water, ten times the safe limit.",
      "content": "🚨 BREAKING: The EPA has confirmed DANGEROUS levels of lead contamination in Millbrook's drinking water. Testing revealed lead at a shocking 150 parts per billion — that's TEN TIMES above the federal safety limit of 15 ppb. This is a public health EMERGENCY that the city is trying to cover up. Residents have been drinking poisoned water and city officials knew about it. Children and pregnant women are at severe risk of lead poisoning. Why isn't the mayor declaring a state of emergency? Why isn't this on the national news? The people of Millbrook deserve answers. We demand immediate action — bottled water distribution, pipe replacement, and accountability for every official who let this happen. This is Flint, Michigan all over again. SHARE this post and TAG your representatives! #MillbrookWater #LeadPoisoning #CoverUp"
    },
    {
      "doc_id": "DOC-0004",
      "title": "Millbrook Community Facebook Group: Water Testing Discussion",
      "source": "facebook.com/groups/millbrook",
      "reliability_tier": 3,
      "timestamp": 1709510400,
      "tags": ["community", "water", "discussion", "lead"],
      "content": "Thread: Lead in our water — what's really going on? Sarah M: 'Just saw the Watchdog article saying 150 ppb. That's terrifying! I have a toddler.' Reply — Mike D: 'I actually read the EPA report. It says 18 ppb, not 150. Still above the limit but way less scary than what the Watchdog is saying.' Reply — Sarah M: 'Are you sure? The Watchdog article seemed very detailed.' Reply — James T (City Water Dir.): 'The official EPA reading is 18 ppb at the 90th percentile. We are taking this seriously with treatment optimization. The 150 figure circulating online is incorrect.' Reply — Karen P: 'Even 18 is above the limit! The city should have fixed this years ago.' Reply — Mike D: 'Agreed it needs fixing, but let's be accurate about the numbers. 18 vs 150 is a huge difference.'",
      "snippet": "Community debates actual lead levels after conflicting reports — 18 ppb vs 150 ppb."
    }
  ]
}