{
  "answerability": "evidence_backed_claims_available",
  "claims": [
    {
      "claim": {
        "claim_id": "claim-park-big-break-regional-shoreline-boundary-geometry-20260924",
        "evidence_ids": [
          "evidence-park-big-break-regional-shoreline-boundary-geometry-20260924"
        ],
        "predicate": "managed_land_boundary_geometry",
        "spatial_scope_ids": [],
        "subject_id": "park-big-break-regional-shoreline",
        "temporal_scope": null,
        "value": {
          "boundary_geometry_snapshot": {
            "feature_ids": [
              "ebrpd:11"
            ],
            "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-big-break-regional-shoreline-boundary-geometry-20260924",
          "evidence_id": "evidence-park-big-break-regional-shoreline-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-big-break-regional-shoreline",
        "kind": "park",
        "name": "Big Break Regional Shoreline"
      }
    },
    {
      "claim": {
        "claim_id": "claim-big-break-visitor-profile",
        "evidence_ids": [
          "evidence-ebrpd-big-break-visitor-profile"
        ],
        "predicate": "visitor_profile",
        "spatial_scope_ids": [
          "scope-big-break-regional-shoreline"
        ],
        "subject_id": "park-big-break-regional-shoreline",
        "temporal_scope": null,
        "value": {
          "accessible_facilities": [
            "paved relatively flat Big Break Regional Trail",
            "drinking fountains",
            "restroom"
          ],
          "activities": [
            "biking",
            "boating",
            "dogs",
            "fishing",
            "hiking",
            "kid-friendly"
          ],
          "address": "69 Big Break Road, Oakley, CA 94561",
          "boating": {
            "beach_launch_walk_from_parking_miles": 0.25,
            "water_trailhead": "San Francisco Bay Water Trail"
          },
          "current_alert": {
            "as_of": "2026-09-20",
            "water_quality": "Danger Advisory for blue-green algae"
          },
          "facilities": [
            "visitor center with public Wi-Fi",
            "picnic and meadow areas",
            "shaded amphitheater",
            "boat and kayak launch",
            "100-foot fishing and observation pier"
          ],
          "fishing": {
            "california_license_required": true,
            "ebrpd_fishing_access_permit_required": false
          },
          "hours": "05:00–22:00",
          "parking_fee_usd": 0,
          "seasonal_gate_hours": "08:00 opening; closing varies from 17:00 to 19:00 by month",
          "swimming_allowed": false,
          "trail_connections": [
            "Marsh Creek Regional Trail",
            "Delta de Anza Regional Trail"
          ],
          "visitor_center_hours": "Wednesday–Sunday 10:00–16:00"
        }
      },
      "evidence": [
        {
          "claim_id": "claim-big-break-visitor-profile",
          "evidence_id": "evidence-ebrpd-big-break-visitor-profile",
          "notes": "Direct transcription and conservative structuring of planning-relevant fields from the official park page.",
          "observation_id": "observation-ebrpd-big-break-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-big-break-visitor-profile",
          "observed_at": null,
          "observer": "Wayproof live source review",
          "retrieved_at": "2026-09-20T07:00:00+00:00",
          "source_id": "source-ebrpd-big-break-park-page"
        }
      ],
      "sources": [
        {
          "locator": "https://www.ebparks.org/parks/big-break",
          "publisher": "East Bay Regional Park District",
          "source_id": "source-ebrpd-big-break-park-page"
        }
      ],
      "subject": {
        "entity_id": "park-big-break-regional-shoreline",
        "kind": "park",
        "name": "Big Break Regional Shoreline"
      }
    }
  ],
  "entity": {
    "entity_id": "park-big-break-regional-shoreline",
    "kind": "park",
    "name": "Big Break Regional Shoreline"
  },
  "gap_details": [],
  "history": [
    {
      "action": "ADD",
      "change_set_id": "wp-20260920-ebrpd-parks-batch-05",
      "evidence_refs": [],
      "knowledge_gap_refs": [],
      "path": "canonical/v0/entities/park-big-break-regional-shoreline.json",
      "reason": "Add a deduplicated planning profile from the live EBRPD preserve page reviewed on 2026-09-20.",
      "record_id": "park-big-break-regional-shoreline",
      "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-big-break-regional-shoreline-boundary-geometry-20260924"
      ],
      "knowledge_gap_refs": [],
      "path": "canonical/v0/claims/claim-park-big-break-regional-shoreline-boundary-geometry-20260924.json",
      "reason": "Backfill reviewed managed-land boundary geometry",
      "record_id": "claim-park-big-break-regional-shoreline-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-05",
      "evidence_refs": [
        "evidence-ebrpd-big-break-visitor-profile"
      ],
      "knowledge_gap_refs": [],
      "path": "canonical/v0/claims/claim-big-break-visitor-profile.json",
      "reason": "Add a deduplicated planning profile from the live EBRPD preserve page reviewed on 2026-09-20.",
      "record_id": "claim-big-break-visitor-profile",
      "record_type": "claim",
      "summary": "Add four additional previously uncaptured EBRPD park visitor profiles."
    }
  ],
  "journey": [],
  "knowledge_gaps": [],
  "reference_evidence": [],
  "relationships": [
    {
      "evidence_ids": [
        "evidence-big-break-shoreline-water-quality-20260922"
      ],
      "object_id": "park-big-break-regional-shoreline",
      "predicate": "located_in",
      "relationship_id": "relationship-waterbody-big-break-shoreline-in-big-break-regional-shoreline",
      "subject_id": "waterbody-big-break-shoreline",
      "temporal_scope": null
    }
  ],
  "route_geometry": null,
  "route_geometry_url": null,
  "type": "canonical_entity"
}