{
  "claims": [
    {
      "claim": {
        "claim_id": "claim-ebrpd-swimming-registration-applicability",
        "evidence_ids": [
          "evidence-ebrpd-swimming-registration-applicability"
        ],
        "predicate": "optional_swim_registration",
        "spatial_scope_ids": [
          "scope-ebrpd-water-quality-program"
        ],
        "subject_id": "org-east-bay-regional-park-district",
        "temporal_scope": null,
        "value": {
          "named_facilities": [
            "Castle Rock/Diablo Foothills",
            "Cull Canyon",
            "Don Castro"
          ],
          "pass_hours": [
            "11:00",
            "18:00"
          ],
          "people_per_registration": 5,
          "price_usd": 6,
          "refundable": false,
          "transferable": false,
          "water_exit": "17:30"
        }
      },
      "evidence": [
        {
          "claim_id": "claim-ebrpd-swimming-registration-applicability",
          "evidence_id": "evidence-ebrpd-swimming-registration-applicability",
          "notes": "",
          "observation_id": "observation-ebrpd-swimming-district-registration",
          "stance": "supports"
        }
      ],
      "observations": [
        {
          "artifact_refs": [],
          "content": "EBRPD describes six lakefront beaches, two chlorinated lagoons, two pools, and two bay beaches. Walk-ins at open facilities are first-come until capacity. Optional weekend/holiday registration is named only for Castle Rock/Diablo Foothills, Cull Canyon, and Don Castro; registered sessions cost $6 per person, limit each registration to five entrants, and run 11 AM-6 PM with water exit at 5:30 PM.",
          "observation_id": "observation-ebrpd-swimming-district-registration",
          "observed_at": null,
          "observer": "user-supplied page transcription",
          "retrieved_at": "2026-09-20T00:00:00+00:00",
          "source_id": "source-ebrpd-swimming"
        }
      ],
      "sources": [
        {
          "locator": "https://www.ebparks.org/recreation/swimming",
          "publisher": "East Bay Regional Park District",
          "source_id": "source-ebrpd-swimming"
        }
      ]
    }
  ],
  "entities": [
    {
      "entity_id": "org-east-bay-regional-park-district",
      "kind": "organization",
      "name": "East Bay Regional Park District"
    }
  ],
  "history": [
    {
      "action": "ADD",
      "change_set_id": "wp-20260920-ebrpd-del-valle-swimming",
      "evidence_refs": [],
      "knowledge_gap_refs": [],
      "path": "canonical/v0/observations/observation-ebrpd-swimming-district-registration.json",
      "reason": "Add district-wide and Del Valle-specific swimming evidence with explicit applicability.",
      "record_id": "observation-ebrpd-swimming-district-registration",
      "record_type": "observation",
      "summary": "Add two linked EBRPD swimming sources while keeping district registration rules separate from Del Valle-specific schedules, safety, fees, and current conditions."
    }
  ],
  "navigation": {
    "next_id": "observation-ebrpd-swimming-monitoring",
    "position": 161,
    "previous_id": "observation-ebrpd-swimming-del-valle-hours",
    "total": 1318
  },
  "observations": [
    {
      "artifact_refs": [],
      "content": "EBRPD describes six lakefront beaches, two chlorinated lagoons, two pools, and two bay beaches. Walk-ins at open facilities are first-come until capacity. Optional weekend/holiday registration is named only for Castle Rock/Diablo Foothills, Cull Canyon, and Don Castro; registered sessions cost $6 per person, limit each registration to five entrants, and run 11 AM-6 PM with water exit at 5:30 PM.",
      "observation_id": "observation-ebrpd-swimming-district-registration",
      "observed_at": null,
      "observer": "user-supplied page transcription",
      "retrieved_at": "2026-09-20T00:00:00+00:00",
      "source_id": "source-ebrpd-swimming"
    }
  ],
  "record": {
    "artifact_refs": [],
    "content": "EBRPD describes six lakefront beaches, two chlorinated lagoons, two pools, and two bay beaches. Walk-ins at open facilities are first-come until capacity. Optional weekend/holiday registration is named only for Castle Rock/Diablo Foothills, Cull Canyon, and Don Castro; registered sessions cost $6 per person, limit each registration to five entrants, and run 11 AM-6 PM with water exit at 5:30 PM.",
    "observation_id": "observation-ebrpd-swimming-district-registration",
    "observed_at": null,
    "observer": "user-supplied page transcription",
    "retrieved_at": "2026-09-20T00:00:00+00:00",
    "source_id": "source-ebrpd-swimming"
  },
  "record_type": "observation",
  "related_records": [],
  "sources": [
    {
      "locator": "https://www.ebparks.org/recreation/swimming",
      "publisher": "East Bay Regional Park District",
      "source_id": "source-ebrpd-swimming"
    }
  ]
}