{
  "answerability": "evidence_backed_claims_available",
  "claims": [
    {
      "claim": {
        "claim_id": "claim-park-anthony-chabot-regional-park-boundary-geometry-20260924",
        "evidence_ids": [
          "evidence-park-anthony-chabot-regional-park-boundary-geometry-20260924"
        ],
        "predicate": "managed_land_boundary_geometry",
        "spatial_scope_ids": [],
        "subject_id": "park-anthony-chabot-regional-park",
        "temporal_scope": null,
        "value": {
          "boundary_geometry_snapshot": {
            "feature_ids": [
              "ebrpd:3",
              "ebrpd:4"
            ],
            "path": "geometry/v0/snapshots/ebrpd-managed-land-boundaries-20260924.geojson",
            "sha256": "4e6558956f4f397816d719ff87554289e08dd495314b2d57c83d1634f083e3e5"
          },
          "boundary_type": "managed_land_status_polygons",
          "coordinate_precision_decimal_degrees": 5,
          "coordinate_reference_system": "EPSG:4326",
          "navigation_grade": false
        }
      },
      "evidence": [
        {
          "claim_id": "claim-park-anthony-chabot-regional-park-boundary-geometry-20260924",
          "evidence_id": "evidence-park-anthony-chabot-regional-park-boundary-geometry-20260924",
          "notes": "Supports the selected source polygons and their retained boundary semantics.",
          "observation_id": "observation-managed-land-boundaries-ebrpd-20260924",
          "stance": "supports"
        }
      ],
      "observations": [
        {
          "artifact_refs": [
            "geometry/v0/snapshots/ebrpd-managed-land-boundaries-20260924.geojson"
          ],
          "content": "EBRPD's open-data layer reports the selected current managed-land polygons; parkland and landbank status remain separate.",
          "observation_id": "observation-managed-land-boundaries-ebrpd-20260924",
          "observed_at": null,
          "observer": "",
          "retrieved_at": "2026-09-24T22:00:00+00:00",
          "source_id": "source-ebrpd-managed-land-boundaries-20260924"
        }
      ],
      "sources": [
        {
          "locator": "https://services2.arcgis.com/jeEP9c9zZoQQwtck/arcgis/rest/services/EBRPD_Parks/FeatureServer/0",
          "publisher": "East Bay Regional Park District",
          "source_id": "source-ebrpd-managed-land-boundaries-20260924"
        }
      ],
      "subject": {
        "entity_id": "park-anthony-chabot-regional-park",
        "kind": "park",
        "name": "Anthony Chabot Regional Park"
      }
    },
    {
      "claim": {
        "claim_id": "claim-anthony-chabot-big-bear-loop-closure-2026",
        "evidence_ids": [
          "evidence-anthony-chabot-big-bear-loop-closure-2026"
        ],
        "predicate": "trail_access_status",
        "spatial_scope_ids": [],
        "subject_id": "park-anthony-chabot-regional-park",
        "temporal_scope": {
          "ends_on": "2026-10-30",
          "starts_on": "2026-10-13"
        },
        "value": {
          "cause": "FEMA-funded projects",
          "segment": "entire Big Bear Trail loop",
          "status": "tentatively_closed"
        }
      },
      "evidence": [
        {
          "claim_id": "claim-anthony-chabot-big-bear-loop-closure-2026",
          "evidence_id": "evidence-anthony-chabot-big-bear-loop-closure-2026",
          "notes": "Live EBRPD alert; recheck the official alerts page before travel.",
          "observation_id": "observation-ebrpd-alerts-closures-20260922",
          "stance": "supports"
        }
      ],
      "observations": [
        {
          "artifact_refs": [
            "Alerts and Closures table"
          ],
          "content": "The district alerts page published the park, trail, facility, and water conditions represented by the associated claims. Entries with insufficient page context were not promoted.",
          "observation_id": "observation-ebrpd-alerts-closures-20260922",
          "observed_at": null,
          "observer": "Wayproof live source review",
          "retrieved_at": "2026-09-22T18:30:00+00:00",
          "source_id": "source-ebrpd-alerts-closures"
        }
      ],
      "sources": [
        {
          "locator": "https://www.ebparks.org/alerts-closures",
          "publisher": "East Bay Regional Park District",
          "source_id": "source-ebrpd-alerts-closures"
        }
      ],
      "subject": {
        "entity_id": "park-anthony-chabot-regional-park",
        "kind": "park",
        "name": "Anthony Chabot Regional Park"
      }
    },
    {
      "claim": {
        "claim_id": "claim-anthony-chabot-visitor-profile",
        "evidence_ids": [
          "evidence-ebrpd-anthony-chabot-visitor-profile"
        ],
        "predicate": "visitor_profile",
        "spatial_scope_ids": [
          "scope-anthony-chabot-regional-park"
        ],
        "subject_id": "park-anthony-chabot-regional-park",
        "temporal_scope": null,
        "value": {
          "access": "multiple entrances, staging areas, and walk-in gates on Redwood Road and Skyline Boulevard, plus trail access from Lake Chabot",
          "acreage": 3304,
          "activities": [
            "biking",
            "camping",
            "dogs",
            "hiking",
            "horseback riding",
            "kid-friendly"
          ],
          "address": "9999 Redwood Road, Castro Valley, CA 94546",
          "campground_and_group_camp_gate_hours": "08:00–22:00",
          "current_alerts": {
            "as_of": "2026-09-20",
            "family_campground_closure": "2026-10-12 through 2026-11-30 for restroom improvements and hazardous tree work",
            "trail_impacts": [
              "Brandon Trail segment inaccessible to equestrians",
              "Willowview Trail closed",
              "Redtail Trail closed between Brandon Trail and Grass Valley Trail",
              "Bird Trail permanently rerouted"
            ]
          },
          "family_campground": {
            "drive_to_tent_sites": 53,
            "facilities": [
              "picnic table and fire ring at each site",
              "hot showers"
            ],
            "no_day_use_parking": true,
            "rv_trailer_full_hookup_sites": 12,
            "walk_to_tent_sites": 10
          },
          "group_camps": {
            "capacity_range": [
              35,
              300
            ],
            "count": 7,
            "equestrian_camping": "Bort Meadow Group Camp",
            "minimum_people": 10,
            "reservation_required": true
          },
          "hours": "05:00–22:00",
          "parking_fee_usd": 0,
          "trail_miles": 70
        }
      },
      "evidence": [
        {
          "claim_id": "claim-anthony-chabot-visitor-profile",
          "evidence_id": "evidence-ebrpd-anthony-chabot-visitor-profile",
          "notes": "Direct transcription and conservative structuring of planning-relevant fields from the official park page.",
          "observation_id": "observation-ebrpd-anthony-chabot-visitor-profile",
          "stance": "supports"
        }
      ],
      "observations": [
        {
          "artifact_refs": [
            "Overview",
            "To Reach The Park",
            "Attractions"
          ],
          "content": "The live park page publishes the visitor profile represented by the associated claim, including access, operating information, facilities, and material restrictions.",
          "observation_id": "observation-ebrpd-anthony-chabot-visitor-profile",
          "observed_at": null,
          "observer": "Wayproof live source review",
          "retrieved_at": "2026-09-20T07:00:00+00:00",
          "source_id": "source-ebrpd-anthony-chabot-park-page"
        }
      ],
      "sources": [
        {
          "locator": "https://www.ebparks.org/parks/anthony-chabot",
          "publisher": "East Bay Regional Park District",
          "source_id": "source-ebrpd-anthony-chabot-park-page"
        }
      ],
      "subject": {
        "entity_id": "park-anthony-chabot-regional-park",
        "kind": "park",
        "name": "Anthony Chabot Regional Park"
      }
    }
  ],
  "entity": {
    "entity_id": "park-anthony-chabot-regional-park",
    "kind": "park",
    "name": "Anthony Chabot Regional Park"
  },
  "gap_details": [],
  "history": [
    {
      "action": "ADD",
      "change_set_id": "wp-20260920-ebrpd-parks-batch-04",
      "evidence_refs": [],
      "knowledge_gap_refs": [],
      "path": "canonical/v0/entities/park-anthony-chabot-regional-park.json",
      "reason": "Add a deduplicated planning profile from the live EBRPD preserve page reviewed on 2026-09-20.",
      "record_id": "park-anthony-chabot-regional-park",
      "record_type": "entity",
      "summary": "Add four additional previously uncaptured EBRPD park visitor profiles."
    },
    {
      "action": "ADD",
      "change_set_id": "change-managed-land-boundary-backfill-20260924",
      "evidence_refs": [
        "evidence-park-anthony-chabot-regional-park-boundary-geometry-20260924"
      ],
      "knowledge_gap_refs": [],
      "path": "canonical/v0/claims/claim-park-anthony-chabot-regional-park-boundary-geometry-20260924.json",
      "reason": "Backfill reviewed managed-land boundary geometry",
      "record_id": "claim-park-anthony-chabot-regional-park-boundary-geometry-20260924",
      "record_type": "claim",
      "summary": "Backfill reviewed boundary geometry for every published park, national park, and wilderness entity"
    },
    {
      "action": "ADD",
      "change_set_id": "wp-20260922-ebrpd-current-conditions",
      "evidence_refs": [],
      "knowledge_gap_refs": [],
      "path": "canonical/v0/claims/claim-anthony-chabot-big-bear-loop-closure-2026.json",
      "reason": "Materialize an unambiguous actionable condition from the district alerts page.",
      "record_id": "claim-anthony-chabot-big-bear-loop-closure-2026",
      "record_type": "claim",
      "summary": "Materialize current EBRPD closures and water disruptions for pre-trip rechecks."
    },
    {
      "action": "ADD",
      "change_set_id": "wp-20260920-ebrpd-parks-batch-04",
      "evidence_refs": [
        "evidence-ebrpd-anthony-chabot-visitor-profile"
      ],
      "knowledge_gap_refs": [],
      "path": "canonical/v0/claims/claim-anthony-chabot-visitor-profile.json",
      "reason": "Add a deduplicated planning profile from the live EBRPD preserve page reviewed on 2026-09-20.",
      "record_id": "claim-anthony-chabot-visitor-profile",
      "record_type": "claim",
      "summary": "Add four additional previously uncaptured EBRPD park visitor profiles."
    }
  ],
  "journey": [],
  "knowledge_gaps": [],
  "reference_evidence": [],
  "relationships": [
    {
      "evidence_ids": [
        "evidence-anthony-chabot-campground-profile"
      ],
      "object_id": "park-anthony-chabot-regional-park",
      "predicate": "located_in",
      "relationship_id": "relationship-anthony-chabot-family-campground-in-park",
      "subject_id": "campground-anthony-chabot-family",
      "temporal_scope": null
    }
  ],
  "route_geometry": null,
  "route_geometry_url": null,
  "type": "canonical_entity"
}