{
  "answerability": "evidence_backed_claims_available",
  "claims": [
    {
      "claim": {
        "claim_id": "claim-park-diablo-foothills-regional-park-boundary-geometry-20260924",
        "evidence_ids": [
          "evidence-park-diablo-foothills-regional-park-boundary-geometry-20260924"
        ],
        "predicate": "managed_land_boundary_geometry",
        "spatial_scope_ids": [],
        "subject_id": "park-diablo-foothills-regional-park",
        "temporal_scope": null,
        "value": {
          "boundary_geometry_snapshot": {
            "feature_ids": [
              "ebrpd:52",
              "ebrpd:53"
            ],
            "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-diablo-foothills-regional-park-boundary-geometry-20260924",
          "evidence_id": "evidence-park-diablo-foothills-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-diablo-foothills-regional-park",
        "kind": "park",
        "name": "Diablo Foothills Regional Park"
      }
    },
    {
      "claim": {
        "claim_id": "claim-diablo-foothills-visitor-profile",
        "evidence_ids": [
          "evidence-ebrpd-diablo-foothills-visitor-profile"
        ],
        "predicate": "visitor_profile",
        "spatial_scope_ids": [
          "scope-diablo-foothills-regional-park"
        ],
        "subject_id": "park-diablo-foothills-regional-park",
        "temporal_scope": null,
        "value": {
          "access": {
            "northern": [
              "Orchard staging area",
              "Castle Rock Road staging area"
            ],
            "southern": [
              "Livorna staging area"
            ],
            "walk_in": [
              "Childers Lane"
            ]
          },
          "accessible_facilities_at_castle_rock": [
            "pathways",
            "restroom",
            "drinking fountain",
            "pool lift"
          ],
          "acreage": 1060,
          "activities": [
            "biking",
            "dogs",
            "hiking",
            "horseback riding",
            "kid-friendly"
          ],
          "address": "1700 Castle Rock Road, Walnut Creek, CA 94598",
          "annual_closure": "Pine Canyon rock formations close February 1 through July 31 for peregrine falcon nesting",
          "connections": [
            "Mount Diablo State Park",
            "Walnut Creek Open Space"
          ],
          "contains": "Castle Rock Regional Recreation Area",
          "hours": "05:00–22:00 unless otherwise posted or permitted",
          "parking_fee_usd": 0,
          "seasonal_parking_lot_hours": "07:30 opening; closing varies from 19:00 to 21:00 by month",
          "swimming": "Castle Rock Pool only when lifeguards are on duty; seasonal schedule and entry fee apply"
        }
      },
      "evidence": [
        {
          "claim_id": "claim-diablo-foothills-visitor-profile",
          "evidence_id": "evidence-ebrpd-diablo-foothills-visitor-profile",
          "notes": "Direct transcription and conservative structuring of planning-relevant fields from the official park page.",
          "observation_id": "observation-ebrpd-diablo-foothills-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-diablo-foothills-visitor-profile",
          "observed_at": null,
          "observer": "Wayproof live source review",
          "retrieved_at": "2026-09-20T07:00:00+00:00",
          "source_id": "source-ebrpd-diablo-foothills-park-page"
        }
      ],
      "sources": [
        {
          "locator": "https://www.ebparks.org/parks/diablo-foothills",
          "publisher": "East Bay Regional Park District",
          "source_id": "source-ebrpd-diablo-foothills-park-page"
        }
      ],
      "subject": {
        "entity_id": "park-diablo-foothills-regional-park",
        "kind": "park",
        "name": "Diablo Foothills Regional Park"
      }
    }
  ],
  "entity": {
    "entity_id": "park-diablo-foothills-regional-park",
    "kind": "park",
    "name": "Diablo Foothills Regional Park"
  },
  "gap_details": [],
  "history": [
    {
      "action": "ADD",
      "change_set_id": "wp-20260920-ebrpd-parks-batch-07",
      "evidence_refs": [],
      "knowledge_gap_refs": [],
      "path": "canonical/v0/entities/park-diablo-foothills-regional-park.json",
      "reason": "Add a deduplicated planning profile from the live EBRPD preserve page reviewed on 2026-09-20.",
      "record_id": "park-diablo-foothills-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-diablo-foothills-regional-park-boundary-geometry-20260924"
      ],
      "knowledge_gap_refs": [],
      "path": "canonical/v0/claims/claim-park-diablo-foothills-regional-park-boundary-geometry-20260924.json",
      "reason": "Backfill reviewed managed-land boundary geometry",
      "record_id": "claim-park-diablo-foothills-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-20260920-ebrpd-parks-batch-07",
      "evidence_refs": [
        "evidence-ebrpd-diablo-foothills-visitor-profile"
      ],
      "knowledge_gap_refs": [],
      "path": "canonical/v0/claims/claim-diablo-foothills-visitor-profile.json",
      "reason": "Add a deduplicated planning profile from the live EBRPD preserve page reviewed on 2026-09-20.",
      "record_id": "claim-diablo-foothills-visitor-profile",
      "record_type": "claim",
      "summary": "Add four additional previously uncaptured EBRPD park visitor profiles."
    }
  ],
  "journey": [],
  "knowledge_gaps": [],
  "reference_evidence": [],
  "relationships": [],
  "route_geometry": null,
  "route_geometry_url": null,
  "type": "canonical_entity"
}