{
  "claims": [
    {
      "claim": {
        "claim_id": "claim-ebrpd-algae-bloom-conditions",
        "evidence_ids": [
          "evidence-ebrpd-algae-bloom-conditions"
        ],
        "predicate": "bloom_conditions",
        "spatial_scope_ids": [
          "scope-ebrpd-water-quality-program"
        ],
        "subject_id": "program-ebrpd-hab-monitoring",
        "temporal_scope": null,
        "value": [
          "low_water",
          "limited_circulation",
          "increased_temperature",
          "increased_light",
          "low_oxygen",
          "high_phosphorus"
        ]
      },
      "evidence": [
        {
          "claim_id": "claim-ebrpd-algae-bloom-conditions",
          "evidence_id": "evidence-ebrpd-algae-bloom-conditions",
          "notes": "",
          "observation_id": "observation-ebrpd-algae-bloom-context",
          "stance": "supports"
        }
      ],
      "observations": [
        {
          "artifact_refs": [],
          "content": "Blue-green algae are cyanobacteria. Low water, limited circulation, increased temperature and light, low oxygen, and high phosphorus can favor blooms and potential toxin release; toxin production remains incompletely understood.",
          "observation_id": "observation-ebrpd-algae-bloom-context",
          "observed_at": null,
          "observer": "user-supplied page transcription",
          "retrieved_at": "2026-09-20T00:00:00+00:00",
          "source_id": "source-ebrpd-blue-green-algae"
        }
      ],
      "sources": [
        {
          "locator": "https://www.ebparks.org/natural-resources/water-quality/blue-green-algae",
          "publisher": "East Bay Regional Park District",
          "source_id": "source-ebrpd-blue-green-algae"
        }
      ]
    }
  ],
  "entities": [
    {
      "entity_id": "program-ebrpd-hab-monitoring",
      "kind": "monitoring_program",
      "name": "EBRPD Harmful Algal Bloom Monitoring Program"
    }
  ],
  "history": [
    {
      "action": "ADD",
      "change_set_id": "wp-20260920-ebrpd-blue-green-algae",
      "evidence_refs": [],
      "knowledge_gap_refs": [],
      "path": "canonical/v0/observations/observation-ebrpd-algae-bloom-context.json",
      "reason": "Add EBRPD blue-green-algae health guidance and dated Del Valle conditions.",
      "record_id": "observation-ebrpd-algae-bloom-context",
      "record_type": "observation",
      "summary": "Add EBRPD harmful-algal-bloom health and monitoring guidance, corroborate dated Del Valle beach conditions, and preserve the unresolved advisory-level action boundary."
    }
  ],
  "navigation": {
    "next_id": "observation-ebrpd-algae-current-del-valle",
    "position": 48,
    "previous_id": "observation-ebrpd-alerts-recheck",
    "total": 1318
  },
  "observations": [
    {
      "artifact_refs": [],
      "content": "Blue-green algae are cyanobacteria. Low water, limited circulation, increased temperature and light, low oxygen, and high phosphorus can favor blooms and potential toxin release; toxin production remains incompletely understood.",
      "observation_id": "observation-ebrpd-algae-bloom-context",
      "observed_at": null,
      "observer": "user-supplied page transcription",
      "retrieved_at": "2026-09-20T00:00:00+00:00",
      "source_id": "source-ebrpd-blue-green-algae"
    }
  ],
  "record": {
    "artifact_refs": [],
    "content": "Blue-green algae are cyanobacteria. Low water, limited circulation, increased temperature and light, low oxygen, and high phosphorus can favor blooms and potential toxin release; toxin production remains incompletely understood.",
    "observation_id": "observation-ebrpd-algae-bloom-context",
    "observed_at": null,
    "observer": "user-supplied page transcription",
    "retrieved_at": "2026-09-20T00:00:00+00:00",
    "source_id": "source-ebrpd-blue-green-algae"
  },
  "record_type": "observation",
  "related_records": [],
  "sources": [
    {
      "locator": "https://www.ebparks.org/natural-resources/water-quality/blue-green-algae",
      "publisher": "East Bay Regional Park District",
      "source_id": "source-ebrpd-blue-green-algae"
    }
  ]
}