{
  "answerability": "evidence_backed_claims_available",
  "claims": [
    {
      "claim": {
        "claim_id": "claim-quarry-lakes-accessibility",
        "evidence_ids": [
          "evidence-quarry-lakes-accessibility"
        ],
        "predicate": "accessibility_profile",
        "spatial_scope_ids": [
          "scope-quarry-lakes-regional-recreation-area"
        ],
        "subject_id": "park-quarry-lakes-regional-recreation-area",
        "temporal_scope": null,
        "value": {
          "beach_wheelchair": {
            "assistant_required": true,
            "availability": "first-come, first-served",
            "cost": "free",
            "water_entry_permitted": false
          },
          "rock_picnic_area_parking": false,
          "wheelchair_accessible": [
            "Horseshoe Lake fishing pier",
            "Niles Beach facilities",
            "Ensenada Pavilion area",
            "Orchard picnic area",
            "Rock picnic area bathrooms and drinking fountain"
          ]
        }
      },
      "evidence": [
        {
          "claim_id": "claim-quarry-lakes-accessibility",
          "evidence_id": "evidence-quarry-lakes-accessibility",
          "notes": "Official park guidance; current conditions require a pre-trip recheck.",
          "observation_id": "observation-ebrpd-quarry-lakes-water-rules-20260922",
          "stance": "supports"
        }
      ],
      "observations": [
        {
          "artifact_refs": [
            "Current notices",
            "To Reach The Park",
            "Park Accessibility",
            "Attractions"
          ],
          "content": "The live official park page publishes the water-body conditions, water-contact rules, recreation requirements, accessibility, access points, and closures represented by the associated claims.",
          "observation_id": "observation-ebrpd-quarry-lakes-water-rules-20260922",
          "observed_at": null,
          "observer": "Wayproof live source review",
          "retrieved_at": "2026-09-22T20:00:00+00:00",
          "source_id": "source-ebrpd-quarry-lakes-park-page"
        }
      ],
      "sources": [
        {
          "locator": "https://www.ebparks.org/parks/quarry-lakes",
          "publisher": "East Bay Regional Park District",
          "source_id": "source-ebrpd-quarry-lakes-park-page"
        }
      ],
      "subject": {
        "entity_id": "park-quarry-lakes-regional-recreation-area",
        "kind": "park",
        "name": "Quarry Lakes Regional Recreation Area"
      }
    },
    {
      "claim": {
        "claim_id": "claim-park-quarry-lakes-regional-recreation-area-boundary-geometry-20260924",
        "evidence_ids": [
          "evidence-park-quarry-lakes-regional-recreation-area-boundary-geometry-20260924"
        ],
        "predicate": "managed_land_boundary_geometry",
        "spatial_scope_ids": [],
        "subject_id": "park-quarry-lakes-regional-recreation-area",
        "temporal_scope": null,
        "value": {
          "boundary_geometry_snapshot": {
            "feature_ids": [
              "ebrpd:98",
              "ebrpd:99"
            ],
            "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-quarry-lakes-regional-recreation-area-boundary-geometry-20260924",
          "evidence_id": "evidence-park-quarry-lakes-regional-recreation-area-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-quarry-lakes-regional-recreation-area",
        "kind": "park",
        "name": "Quarry Lakes Regional Recreation Area"
      }
    },
    {
      "claim": {
        "claim_id": "claim-quarry-lakes-visitor-profile",
        "evidence_ids": [
          "evidence-ebrpd-quarry-lakes-visitor-profile"
        ],
        "predicate": "visitor_profile",
        "spatial_scope_ids": [
          "scope-quarry-lakes-regional-recreation-area"
        ],
        "subject_id": "park-quarry-lakes-regional-recreation-area",
        "temporal_scope": null,
        "value": {
          "access": [
            "main entrance",
            "Niles Beach",
            "boat launch",
            "ADA fishing pier",
            "two Alameda Creek Trail walk-in entrances"
          ],
          "accessible_facilities": [
            "beach wheelchair",
            "Horseshoe Lake fishing pier",
            "Niles Beach facilities",
            "Ensenada Pavilion",
            "Orchard picnic area",
            "Rock picnic-area restrooms and fountain"
          ],
          "acreage": {
            "lakes": 350,
            "total": 471
          },
          "activities": [
            "biking",
            "boating",
            "dogs",
            "fishing",
            "geocaching",
            "hiking",
            "kid-friendly",
            "picnicking",
            "swimming"
          ],
          "address": "2100 Isherwood Way, Fremont, CA 94536",
          "bus_fee_usd": 25,
          "curfew": "22:00–05:00",
          "parking_fee_usd": 5,
          "payment": "cashless",
          "seasonal_gate_hours": "06:00 or 07:00 opening; closing varies from 17:00 to 20:00",
          "trailered_vehicle_fee_usd": 5,
          "water_rules": {
            "lago_los_osos_water_contact": false,
            "rainbow_lake_swimming": false,
            "shinn_pond_swimming": false,
            "swimming": "Niles Beach swim ropes only",
            "watercraft_inspection_required": true
          }
        }
      },
      "evidence": [
        {
          "claim_id": "claim-quarry-lakes-visitor-profile",
          "evidence_id": "evidence-ebrpd-quarry-lakes-visitor-profile",
          "notes": "Direct transcription and conservative structuring of planning-relevant fields from the official park page.",
          "observation_id": "observation-ebrpd-quarry-lakes-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-quarry-lakes-visitor-profile",
          "observed_at": null,
          "observer": "Wayproof live source review",
          "retrieved_at": "2026-09-20T07:00:00+00:00",
          "source_id": "source-ebrpd-quarry-lakes-park-page"
        }
      ],
      "sources": [
        {
          "locator": "https://www.ebparks.org/parks/quarry-lakes",
          "publisher": "East Bay Regional Park District",
          "source_id": "source-ebrpd-quarry-lakes-park-page"
        }
      ],
      "subject": {
        "entity_id": "park-quarry-lakes-regional-recreation-area",
        "kind": "park",
        "name": "Quarry Lakes Regional Recreation Area"
      }
    },
    {
      "claim": {
        "claim_id": "claim-quarry-lakes-watercraft-inspection",
        "evidence_ids": [
          "evidence-quarry-lakes-watercraft-inspection"
        ],
        "predicate": "watercraft_rule",
        "spatial_scope_ids": [
          "scope-quarry-lakes-regional-recreation-area"
        ],
        "subject_id": "park-quarry-lakes-regional-recreation-area",
        "temporal_scope": null,
        "value": {
          "mandatory_inspection": true,
          "purpose": "prevent invasive mussels"
        }
      },
      "evidence": [
        {
          "claim_id": "claim-quarry-lakes-watercraft-inspection",
          "evidence_id": "evidence-quarry-lakes-watercraft-inspection",
          "notes": "Official park guidance; current conditions require a pre-trip recheck.",
          "observation_id": "observation-ebrpd-quarry-lakes-water-rules-20260922",
          "stance": "supports"
        }
      ],
      "observations": [
        {
          "artifact_refs": [
            "Current notices",
            "To Reach The Park",
            "Park Accessibility",
            "Attractions"
          ],
          "content": "The live official park page publishes the water-body conditions, water-contact rules, recreation requirements, accessibility, access points, and closures represented by the associated claims.",
          "observation_id": "observation-ebrpd-quarry-lakes-water-rules-20260922",
          "observed_at": null,
          "observer": "Wayproof live source review",
          "retrieved_at": "2026-09-22T20:00:00+00:00",
          "source_id": "source-ebrpd-quarry-lakes-park-page"
        }
      ],
      "sources": [
        {
          "locator": "https://www.ebparks.org/parks/quarry-lakes",
          "publisher": "East Bay Regional Park District",
          "source_id": "source-ebrpd-quarry-lakes-park-page"
        }
      ],
      "subject": {
        "entity_id": "park-quarry-lakes-regional-recreation-area",
        "kind": "park",
        "name": "Quarry Lakes Regional Recreation Area"
      }
    }
  ],
  "entity": {
    "entity_id": "park-quarry-lakes-regional-recreation-area",
    "kind": "park",
    "name": "Quarry Lakes Regional Recreation Area"
  },
  "gap_details": [],
  "history": [
    {
      "action": "ADD",
      "change_set_id": "wp-20260921-ebrpd-parks-batch-12",
      "evidence_refs": [],
      "knowledge_gap_refs": [],
      "path": "canonical/v0/entities/park-quarry-lakes-regional-recreation-area.json",
      "reason": "Add a deduplicated planning profile from the live EBRPD preserve page reviewed on 2026-09-20.",
      "record_id": "park-quarry-lakes-regional-recreation-area",
      "record_type": "entity",
      "summary": "Add four additional previously uncaptured EBRPD park visitor profiles."
    },
    {
      "action": "ADD",
      "change_set_id": "wp-20260922-contra-loma-quarry-water-rules",
      "evidence_refs": [],
      "knowledge_gap_refs": [],
      "path": "canonical/v0/claims/claim-quarry-lakes-accessibility.json",
      "reason": "Deepen official water, recreation, access, facility, or route knowledge.",
      "record_id": "claim-quarry-lakes-accessibility",
      "record_type": "claim",
      "summary": "Deepen Contra Loma and Quarry Lakes water-recreation planning knowledge."
    },
    {
      "action": "ADD",
      "change_set_id": "change-managed-land-boundary-backfill-20260924",
      "evidence_refs": [
        "evidence-park-quarry-lakes-regional-recreation-area-boundary-geometry-20260924"
      ],
      "knowledge_gap_refs": [],
      "path": "canonical/v0/claims/claim-park-quarry-lakes-regional-recreation-area-boundary-geometry-20260924.json",
      "reason": "Backfill reviewed managed-land boundary geometry",
      "record_id": "claim-park-quarry-lakes-regional-recreation-area-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-20260921-ebrpd-parks-batch-12",
      "evidence_refs": [
        "evidence-ebrpd-quarry-lakes-visitor-profile"
      ],
      "knowledge_gap_refs": [],
      "path": "canonical/v0/claims/claim-quarry-lakes-visitor-profile.json",
      "reason": "Add a deduplicated planning profile from the live EBRPD preserve page reviewed on 2026-09-20.",
      "record_id": "claim-quarry-lakes-visitor-profile",
      "record_type": "claim",
      "summary": "Add four additional previously uncaptured EBRPD park visitor profiles."
    },
    {
      "action": "ADD",
      "change_set_id": "wp-20260922-contra-loma-quarry-water-rules",
      "evidence_refs": [],
      "knowledge_gap_refs": [],
      "path": "canonical/v0/claims/claim-quarry-lakes-watercraft-inspection.json",
      "reason": "Deepen official water, recreation, access, facility, or route knowledge.",
      "record_id": "claim-quarry-lakes-watercraft-inspection",
      "record_type": "claim",
      "summary": "Deepen Contra Loma and Quarry Lakes water-recreation planning knowledge."
    }
  ],
  "journey": [],
  "knowledge_gaps": [],
  "reference_evidence": [],
  "relationships": [
    {
      "evidence_ids": [
        "evidence-entrance-quarry-alameda-creek-east-walk-in-access-profile"
      ],
      "object_id": "park-quarry-lakes-regional-recreation-area",
      "predicate": "accesses",
      "relationship_id": "relationship-entrance-quarry-alameda-creek-east-walk-in-in-quarry-lakes",
      "subject_id": "entrance-quarry-alameda-creek-east-walk-in",
      "temporal_scope": null
    },
    {
      "evidence_ids": [
        "evidence-entrance-quarry-alameda-creek-west-walk-in-access-profile"
      ],
      "object_id": "park-quarry-lakes-regional-recreation-area",
      "predicate": "accesses",
      "relationship_id": "relationship-entrance-quarry-alameda-creek-west-walk-in-in-quarry-lakes",
      "subject_id": "entrance-quarry-alameda-creek-west-walk-in",
      "temporal_scope": null
    },
    {
      "evidence_ids": [
        "evidence-facility-quarry-ada-fishing-pier-access-profile"
      ],
      "object_id": "park-quarry-lakes-regional-recreation-area",
      "predicate": "located_in",
      "relationship_id": "relationship-facility-quarry-ada-fishing-pier-in-quarry-lakes",
      "subject_id": "facility-quarry-ada-fishing-pier",
      "temporal_scope": null
    },
    {
      "evidence_ids": [
        "evidence-facility-quarry-boat-launch-access-profile"
      ],
      "object_id": "park-quarry-lakes-regional-recreation-area",
      "predicate": "located_in",
      "relationship_id": "relationship-facility-quarry-boat-launch-in-quarry-lakes",
      "subject_id": "facility-quarry-boat-launch",
      "temporal_scope": null
    },
    {
      "evidence_ids": [
        "evidence-facility-quarry-niles-beach-access-profile"
      ],
      "object_id": "park-quarry-lakes-regional-recreation-area",
      "predicate": "located_in",
      "relationship_id": "relationship-facility-quarry-niles-beach-in-quarry-lakes",
      "subject_id": "facility-quarry-niles-beach",
      "temporal_scope": null
    },
    {
      "evidence_ids": [
        "evidence-quarry-horseshoe-lake-water-quality-20260922"
      ],
      "object_id": "park-quarry-lakes-regional-recreation-area",
      "predicate": "located_in",
      "relationship_id": "relationship-quarry-horseshoe-lake-in-quarry-lakes",
      "subject_id": "waterbody-quarry-horseshoe-lake",
      "temporal_scope": null
    },
    {
      "evidence_ids": [
        "evidence-quarry-lago-los-osos-water-quality-20260922"
      ],
      "object_id": "park-quarry-lakes-regional-recreation-area",
      "predicate": "located_in",
      "relationship_id": "relationship-quarry-lago-los-osos-in-quarry-lakes",
      "subject_id": "waterbody-quarry-lago-los-osos",
      "temporal_scope": null
    },
    {
      "evidence_ids": [
        "evidence-quarry-rainbow-lake-water-quality-20260922"
      ],
      "object_id": "park-quarry-lakes-regional-recreation-area",
      "predicate": "located_in",
      "relationship_id": "relationship-quarry-rainbow-lake-in-quarry-lakes",
      "subject_id": "waterbody-quarry-rainbow-lake",
      "temporal_scope": null
    },
    {
      "evidence_ids": [
        "evidence-quarry-shinn-pond-water-quality-20260922"
      ],
      "object_id": "park-quarry-lakes-regional-recreation-area",
      "predicate": "located_in",
      "relationship_id": "relationship-quarry-shinn-pond-in-quarry-lakes",
      "subject_id": "waterbody-quarry-shinn-pond",
      "temporal_scope": null
    }
  ],
  "route_geometry": null,
  "route_geometry_url": null,
  "type": "canonical_entity"
}
