{
  "claims": [
    {
      "claim": {
        "claim_id": "claim-ebrpd-swimming-del-valle-lifeguard-hours",
        "evidence_ids": [
          "evidence-ebrpd-swimming-del-valle-lifeguard-hours"
        ],
        "predicate": "lifeguard_schedule",
        "spatial_scope_ids": [
          "scope-del-valle-park"
        ],
        "subject_id": "park-del-valle-regional-park",
        "temporal_scope": null,
        "value": {
          "days": "weekends_and_holidays",
          "hours": [
            "11:00",
            "18:00"
          ],
          "season": "May 16 through September 27",
          "year_stated": false
        }
      },
      "evidence": [
        {
          "claim_id": "claim-ebrpd-swimming-del-valle-lifeguard-hours",
          "evidence_id": "evidence-ebrpd-swimming-del-valle-lifeguard-hours",
          "notes": "",
          "observation_id": "observation-ebrpd-swimming-del-valle-hours",
          "stance": "supports"
        }
      ],
      "observations": [
        {
          "artifact_refs": [],
          "content": "The Del Valle swimming page lists lifeguards 11 AM-6 PM on weekends and holidays from May 16 through September 27, two beaches, and year-round swimming without lifeguards north of the boat ramp.",
          "observation_id": "observation-ebrpd-swimming-del-valle-hours",
          "observed_at": null,
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          "retrieved_at": "2026-09-20T00:00:00+00:00",
          "source_id": "source-ebrpd-del-valle-swimming"
        }
      ],
      "sources": [
        {
          "locator": "https://www.ebparks.org/recreation/swimming/del-valle",
          "publisher": "East Bay Regional Park District",
          "source_id": "source-ebrpd-del-valle-swimming"
        }
      ]
    },
    {
      "claim": {
        "claim_id": "claim-ebrpd-swimming-east-beach-in-park",
        "evidence_ids": [
          "evidence-ebrpd-swimming-east-beach-in-park"
        ],
        "predicate": "located_in",
        "spatial_scope_ids": [
          "scope-del-valle-east-beach"
        ],
        "subject_id": "beach-del-valle-east",
        "temporal_scope": null,
        "value": "park-del-valle-regional-park"
      },
      "evidence": [
        {
          "claim_id": "claim-ebrpd-swimming-east-beach-in-park",
          "evidence_id": "evidence-ebrpd-swimming-east-beach-in-park",
          "notes": "",
          "observation_id": "observation-ebrpd-swimming-del-valle-hours",
          "stance": "supports"
        }
      ],
      "observations": [
        {
          "artifact_refs": [],
          "content": "The Del Valle swimming page lists lifeguards 11 AM-6 PM on weekends and holidays from May 16 through September 27, two beaches, and year-round swimming without lifeguards north of the boat ramp.",
          "observation_id": "observation-ebrpd-swimming-del-valle-hours",
          "observed_at": null,
          "observer": "user-supplied page transcription",
          "retrieved_at": "2026-09-20T00:00:00+00:00",
          "source_id": "source-ebrpd-del-valle-swimming"
        }
      ],
      "sources": [
        {
          "locator": "https://www.ebparks.org/recreation/swimming/del-valle",
          "publisher": "East Bay Regional Park District",
          "source_id": "source-ebrpd-del-valle-swimming"
        }
      ]
    },
    {
      "claim": {
        "claim_id": "claim-ebrpd-swimming-west-beach-in-park",
        "evidence_ids": [
          "evidence-ebrpd-swimming-west-beach-in-park"
        ],
        "predicate": "located_in",
        "spatial_scope_ids": [
          "scope-del-valle-west-beach"
        ],
        "subject_id": "beach-del-valle-west",
        "temporal_scope": null,
        "value": "park-del-valle-regional-park"
      },
      "evidence": [
        {
          "claim_id": "claim-ebrpd-swimming-west-beach-in-park",
          "evidence_id": "evidence-ebrpd-swimming-west-beach-in-park",
          "notes": "",
          "observation_id": "observation-ebrpd-swimming-del-valle-hours",
          "stance": "supports"
        }
      ],
      "observations": [
        {
          "artifact_refs": [],
          "content": "The Del Valle swimming page lists lifeguards 11 AM-6 PM on weekends and holidays from May 16 through September 27, two beaches, and year-round swimming without lifeguards north of the boat ramp.",
          "observation_id": "observation-ebrpd-swimming-del-valle-hours",
          "observed_at": null,
          "observer": "user-supplied page transcription",
          "retrieved_at": "2026-09-20T00:00:00+00:00",
          "source_id": "source-ebrpd-del-valle-swimming"
        }
      ],
      "sources": [
        {
          "locator": "https://www.ebparks.org/recreation/swimming/del-valle",
          "publisher": "East Bay Regional Park District",
          "source_id": "source-ebrpd-del-valle-swimming"
        }
      ]
    },
    {
      "claim": {
        "claim_id": "claim-ebrpd-swimming-year-round-unlifeguarded",
        "evidence_ids": [
          "evidence-ebrpd-swimming-year-round-unlifeguarded"
        ],
        "predicate": "unlifeguarded_swimming_area",
        "spatial_scope_ids": [
          "scope-lake-del-valle"
        ],
        "subject_id": "lake-del-valle",
        "temporal_scope": null,
        "value": {
          "allowed": "year_round",
          "lifeguard_service": false,
          "location": "north of boat ramp"
        }
      },
      "evidence": [
        {
          "claim_id": "claim-ebrpd-swimming-year-round-unlifeguarded",
          "evidence_id": "evidence-ebrpd-swimming-year-round-unlifeguarded",
          "notes": "",
          "observation_id": "observation-ebrpd-swimming-del-valle-hours",
          "stance": "supports"
        }
      ],
      "observations": [
        {
          "artifact_refs": [],
          "content": "The Del Valle swimming page lists lifeguards 11 AM-6 PM on weekends and holidays from May 16 through September 27, two beaches, and year-round swimming without lifeguards north of the boat ramp.",
          "observation_id": "observation-ebrpd-swimming-del-valle-hours",
          "observed_at": null,
          "observer": "user-supplied page transcription",
          "retrieved_at": "2026-09-20T00:00:00+00:00",
          "source_id": "source-ebrpd-del-valle-swimming"
        }
      ],
      "sources": [
        {
          "locator": "https://www.ebparks.org/recreation/swimming/del-valle",
          "publisher": "East Bay Regional Park District",
          "source_id": "source-ebrpd-del-valle-swimming"
        }
      ]
    }
  ],
  "entities": [
    {
      "entity_id": "beach-del-valle-east",
      "kind": "swim_beach",
      "name": "Del Valle East Swim Beach"
    },
    {
      "entity_id": "beach-del-valle-west",
      "kind": "swim_beach",
      "name": "Del Valle West Swim Beach"
    },
    {
      "entity_id": "lake-del-valle",
      "kind": "lake",
      "name": "Lake Del Valle"
    },
    {
      "entity_id": "park-del-valle-regional-park",
      "kind": "park",
      "name": "Del Valle Regional Park"
    }
  ],
  "history": [
    {
      "action": "ADD",
      "change_set_id": "wp-20260920-ebrpd-del-valle-swimming",
      "evidence_refs": [],
      "knowledge_gap_refs": [],
      "path": "canonical/v0/observations/observation-ebrpd-swimming-del-valle-hours.json",
      "reason": "Add district-wide and Del Valle-specific swimming evidence with explicit applicability.",
      "record_id": "observation-ebrpd-swimming-del-valle-hours",
      "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-district-registration",
    "position": 160,
    "previous_id": "observation-ebrpd-swimming-del-valle-fee",
    "total": 1318
  },
  "observations": [
    {
      "artifact_refs": [],
      "content": "The Del Valle swimming page lists lifeguards 11 AM-6 PM on weekends and holidays from May 16 through September 27, two beaches, and year-round swimming without lifeguards north of the boat ramp.",
      "observation_id": "observation-ebrpd-swimming-del-valle-hours",
      "observed_at": null,
      "observer": "user-supplied page transcription",
      "retrieved_at": "2026-09-20T00:00:00+00:00",
      "source_id": "source-ebrpd-del-valle-swimming"
    }
  ],
  "record": {
    "artifact_refs": [],
    "content": "The Del Valle swimming page lists lifeguards 11 AM-6 PM on weekends and holidays from May 16 through September 27, two beaches, and year-round swimming without lifeguards north of the boat ramp.",
    "observation_id": "observation-ebrpd-swimming-del-valle-hours",
    "observed_at": null,
    "observer": "user-supplied page transcription",
    "retrieved_at": "2026-09-20T00:00:00+00:00",
    "source_id": "source-ebrpd-del-valle-swimming"
  },
  "record_type": "observation",
  "related_records": [],
  "sources": [
    {
      "locator": "https://www.ebparks.org/recreation/swimming/del-valle",
      "publisher": "East Bay Regional Park District",
      "source_id": "source-ebrpd-del-valle-swimming"
    }
  ]
}