{
  "claims": [
    {
      "claim": {
        "claim_id": "claim-contra-loma-accessible-water-sanitation",
        "evidence_ids": [
          "evidence-contra-loma-accessible-water-sanitation"
        ],
        "predicate": "facility_profile",
        "spatial_scope_ids": [
          "scope-contra-loma-regional-park"
        ],
        "subject_id": "park-contra-loma-regional-park",
        "temporal_scope": null,
        "value": {
          "south_fishing_dock_access": "paved trail",
          "wheelchair_accessible": [
            "restrooms",
            "drinking fountains",
            "parking",
            "south fishing dock"
          ]
        }
      },
      "evidence": [
        {
          "claim_id": "claim-contra-loma-accessible-water-sanitation",
          "evidence_id": "evidence-contra-loma-accessible-water-sanitation",
          "notes": "Official park guidance; current conditions require a pre-trip recheck.",
          "observation_id": "observation-ebrpd-contra-loma-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-contra-loma-water-rules-20260922",
          "observed_at": null,
          "observer": "Wayproof live source review",
          "retrieved_at": "2026-09-22T20:00:00+00:00",
          "source_id": "source-ebrpd-contra-loma-park-page"
        }
      ],
      "sources": [
        {
          "locator": "https://www.ebparks.org/parks/contra-loma",
          "publisher": "East Bay Regional Park District",
          "source_id": "source-ebrpd-contra-loma-park-page"
        }
      ]
    },
    {
      "claim": {
        "claim_id": "claim-contra-loma-alcohol-prohibited",
        "evidence_ids": [
          "evidence-contra-loma-alcohol-prohibited"
        ],
        "predicate": "recreation_rule",
        "spatial_scope_ids": [
          "scope-contra-loma-regional-park"
        ],
        "subject_id": "park-contra-loma-regional-park",
        "temporal_scope": null,
        "value": {
          "activity": "alcohol possession or consumption",
          "permitted": false
        }
      },
      "evidence": [
        {
          "claim_id": "claim-contra-loma-alcohol-prohibited",
          "evidence_id": "evidence-contra-loma-alcohol-prohibited",
          "notes": "Official park guidance; current conditions require a pre-trip recheck.",
          "observation_id": "observation-ebrpd-contra-loma-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-contra-loma-water-rules-20260922",
          "observed_at": null,
          "observer": "Wayproof live source review",
          "retrieved_at": "2026-09-22T20:00:00+00:00",
          "source_id": "source-ebrpd-contra-loma-park-page"
        }
      ],
      "sources": [
        {
          "locator": "https://www.ebparks.org/parks/contra-loma",
          "publisher": "East Bay Regional Park District",
          "source_id": "source-ebrpd-contra-loma-park-page"
        }
      ]
    },
    {
      "claim": {
        "claim_id": "claim-contra-loma-black-diamond-trail-connection",
        "evidence_ids": [
          "evidence-contra-loma-black-diamond-trail-connection"
        ],
        "predicate": "route_connection",
        "spatial_scope_ids": [
          "scope-contra-loma-regional-park"
        ],
        "subject_id": "park-contra-loma-regional-park",
        "temporal_scope": null,
        "value": {
          "connects_to": "park-black-diamond-mines-regional-preserve"
        }
      },
      "evidence": [
        {
          "claim_id": "claim-contra-loma-black-diamond-trail-connection",
          "evidence_id": "evidence-contra-loma-black-diamond-trail-connection",
          "notes": "Official park guidance; current conditions require a pre-trip recheck.",
          "observation_id": "observation-ebrpd-contra-loma-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-contra-loma-water-rules-20260922",
          "observed_at": null,
          "observer": "Wayproof live source review",
          "retrieved_at": "2026-09-22T20:00:00+00:00",
          "source_id": "source-ebrpd-contra-loma-park-page"
        }
      ],
      "sources": [
        {
          "locator": "https://www.ebparks.org/parks/contra-loma",
          "publisher": "East Bay Regional Park District",
          "source_id": "source-ebrpd-contra-loma-park-page"
        }
      ]
    },
    {
      "claim": {
        "claim_id": "claim-contra-loma-fishing-permit",
        "evidence_ids": [
          "evidence-contra-loma-fishing-permit"
        ],
        "predicate": "recreation_rule",
        "spatial_scope_ids": [
          "scope-contra-loma-regional-park"
        ],
        "subject_id": "park-contra-loma-regional-park",
        "temporal_scope": null,
        "value": {
          "district_daily_fishing_permit_required": true,
          "purchase_location": "park entry kiosk"
        }
      },
      "evidence": [
        {
          "claim_id": "claim-contra-loma-fishing-permit",
          "evidence_id": "evidence-contra-loma-fishing-permit",
          "notes": "Official park guidance; current conditions require a pre-trip recheck.",
          "observation_id": "observation-ebrpd-contra-loma-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-contra-loma-water-rules-20260922",
          "observed_at": null,
          "observer": "Wayproof live source review",
          "retrieved_at": "2026-09-22T20:00:00+00:00",
          "source_id": "source-ebrpd-contra-loma-park-page"
        }
      ],
      "sources": [
        {
          "locator": "https://www.ebparks.org/parks/contra-loma",
          "publisher": "East Bay Regional Park District",
          "source_id": "source-ebrpd-contra-loma-park-page"
        }
      ]
    },
    {
      "claim": {
        "claim_id": "claim-contra-loma-golden-mussel-quarantine-2026",
        "evidence_ids": [
          "evidence-contra-loma-golden-mussel-quarantine-2026"
        ],
        "predicate": "watercraft_rule",
        "spatial_scope_ids": [
          "scope-contra-loma-regional-park"
        ],
        "subject_id": "park-contra-loma-regional-park",
        "temporal_scope": null,
        "value": {
          "boat_bands_cross_lake_valid": false,
          "quarantine_days_from_other_ebrpd_waterbodies": 30,
          "same_lake_return_exception": "intact lake-specific boat band",
          "trigger": "launch at Contra Loma or Del Valle"
        }
      },
      "evidence": [
        {
          "claim_id": "claim-contra-loma-golden-mussel-quarantine-2026",
          "evidence_id": "evidence-contra-loma-golden-mussel-quarantine-2026",
          "notes": "Official park guidance; current conditions require a pre-trip recheck.",
          "observation_id": "observation-ebrpd-contra-loma-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-contra-loma-water-rules-20260922",
          "observed_at": null,
          "observer": "Wayproof live source review",
          "retrieved_at": "2026-09-22T20:00:00+00:00",
          "source_id": "source-ebrpd-contra-loma-park-page"
        }
      ],
      "sources": [
        {
          "locator": "https://www.ebparks.org/parks/contra-loma",
          "publisher": "East Bay Regional Park District",
          "source_id": "source-ebrpd-contra-loma-park-page"
        }
      ]
    },
    {
      "claim": {
        "claim_id": "claim-contra-loma-lake-view-trail-closure-2026",
        "evidence_ids": [
          "evidence-contra-loma-lake-view-trail-closure-2026"
        ],
        "predicate": "trail_access_status",
        "spatial_scope_ids": [
          "scope-contra-loma-regional-park"
        ],
        "subject_id": "park-contra-loma-regional-park",
        "temporal_scope": {
          "ends_on": null,
          "starts_on": null
        },
        "value": {
          "cause": "storm damage",
          "segment": "Lake View Trail at the cattle pond",
          "source_updated_on": "2026-09-22",
          "status": "partially_closed"
        }
      },
      "evidence": [
        {
          "claim_id": "claim-contra-loma-lake-view-trail-closure-2026",
          "evidence_id": "evidence-contra-loma-lake-view-trail-closure-2026",
          "notes": "Official park guidance; current conditions require a pre-trip recheck.",
          "observation_id": "observation-ebrpd-contra-loma-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-contra-loma-water-rules-20260922",
          "observed_at": null,
          "observer": "Wayproof live source review",
          "retrieved_at": "2026-09-22T20:00:00+00:00",
          "source_id": "source-ebrpd-contra-loma-park-page"
        }
      ],
      "sources": [
        {
          "locator": "https://www.ebparks.org/parks/contra-loma",
          "publisher": "East Bay Regional Park District",
          "source_id": "source-ebrpd-contra-loma-park-page"
        }
      ]
    },
    {
      "claim": {
        "claim_id": "claim-contra-loma-lake-view-trail-profile",
        "evidence_ids": [
          "evidence-contra-loma-lake-view-trail-profile"
        ],
        "predicate": "route_profile",
        "spatial_scope_ids": [],
        "subject_id": "route-contra-loma-lake-view-trail",
        "temporal_scope": null,
        "value": {
          "park_id": "park-contra-loma-regional-park"
        }
      },
      "evidence": [
        {
          "claim_id": "claim-contra-loma-lake-view-trail-profile",
          "evidence_id": "evidence-contra-loma-lake-view-trail-profile",
          "notes": "Official park guidance; current conditions require a pre-trip recheck.",
          "observation_id": "observation-ebrpd-contra-loma-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-contra-loma-water-rules-20260922",
          "observed_at": null,
          "observer": "Wayproof live source review",
          "retrieved_at": "2026-09-22T20:00:00+00:00",
          "source_id": "source-ebrpd-contra-loma-park-page"
        }
      ],
      "sources": [
        {
          "locator": "https://www.ebparks.org/parks/contra-loma",
          "publisher": "East Bay Regional Park District",
          "source_id": "source-ebrpd-contra-loma-park-page"
        }
      ]
    },
    {
      "claim": {
        "claim_id": "claim-contra-loma-swim-lagoon-closed",
        "evidence_ids": [
          "evidence-contra-loma-swim-lagoon-closed"
        ],
        "predicate": "facility_access_status",
        "spatial_scope_ids": [
          "scope-contra-loma-regional-park"
        ],
        "subject_id": "park-contra-loma-regional-park",
        "temporal_scope": null,
        "value": {
          "causes": [
            "water quality",
            "maintenance challenges"
          ],
          "facility": "Contra Loma Swim Lagoon",
          "status": "closed"
        }
      },
      "evidence": [
        {
          "claim_id": "claim-contra-loma-swim-lagoon-closed",
          "evidence_id": "evidence-contra-loma-swim-lagoon-closed",
          "notes": "Official park guidance; current conditions require a pre-trip recheck.",
          "observation_id": "observation-ebrpd-contra-loma-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-contra-loma-water-rules-20260922",
          "observed_at": null,
          "observer": "Wayproof live source review",
          "retrieved_at": "2026-09-22T20:00:00+00:00",
          "source_id": "source-ebrpd-contra-loma-park-page"
        }
      ],
      "sources": [
        {
          "locator": "https://www.ebparks.org/parks/contra-loma",
          "publisher": "East Bay Regional Park District",
          "source_id": "source-ebrpd-contra-loma-park-page"
        }
      ]
    },
    {
      "claim": {
        "claim_id": "claim-contra-loma-visitor-profile",
        "evidence_ids": [
          "evidence-ebrpd-contra-loma-visitor-profile"
        ],
        "predicate": "visitor_profile",
        "spatial_scope_ids": [
          "scope-contra-loma-regional-park"
        ],
        "subject_id": "park-contra-loma-regional-park",
        "temporal_scope": null,
        "value": {
          "access": [
            "Frederickson Lane main entrance",
            "swim lagoon",
            "boat launch",
            "ADA fishing dock",
            "three walk-in entrances"
          ],
          "accessible_facilities": [
            "restrooms",
            "drinking fountains",
            "parking",
            "south fishing dock by paved trail",
            "picnic areas",
            "pool lift",
            "loaner beach wheelchair"
          ],
          "acreage": 775,
          "activities": [
            "boating",
            "fishing",
            "hiking",
            "kid-friendly",
            "picnicking"
          ],
          "address": "1200 Frederickson Lane, Antioch, CA 94509",
          "alcohol_allowed": false,
          "bus_fee_usd": 25,
          "current_alerts": {
            "as_of": "2026-09-20",
            "blue_green_algae": "no advisory posted",
            "golden_mussels": "detected; boats launched here are quarantined 30 days from other inspected lakes",
            "lake_view_trail": "closed at cattle pond due to storm damage"
          },
          "fishing": {
            "district_fishing_permit_required": true
          },
          "parking_fee_usd": 5,
          "reservoir_acres": 80,
          "seasonal_hours": "opening varies from 06:00 to 07:00 and closing from 17:30 to 20:30 by month",
          "swim_lagoon": "closed for water-quality and maintenance challenges",
          "trail_connection": "Black Diamond Mines Regional Preserve",
          "trailered_vehicle_fee_usd": 5
        }
      },
      "evidence": [
        {
          "claim_id": "claim-contra-loma-visitor-profile",
          "evidence_id": "evidence-ebrpd-contra-loma-visitor-profile",
          "notes": "Direct transcription and conservative structuring of planning-relevant fields from the official park page.",
          "observation_id": "observation-ebrpd-contra-loma-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-contra-loma-visitor-profile",
          "observed_at": null,
          "observer": "Wayproof live source review",
          "retrieved_at": "2026-09-20T07:00:00+00:00",
          "source_id": "source-ebrpd-contra-loma-park-page"
        }
      ],
      "sources": [
        {
          "locator": "https://www.ebparks.org/parks/contra-loma",
          "publisher": "East Bay Regional Park District",
          "source_id": "source-ebrpd-contra-loma-park-page"
        }
      ]
    },
    {
      "claim": {
        "claim_id": "claim-contra-loma-water-contact-rules",
        "evidence_ids": [
          "evidence-contra-loma-water-contact-rules"
        ],
        "predicate": "recreation_rule",
        "spatial_scope_ids": [
          "scope-contra-loma-regional-park"
        ],
        "subject_id": "park-contra-loma-regional-park",
        "temporal_scope": null,
        "value": {
          "dry_kayaks": {
            "rollovers_or_body_contact_activity_permitted": false
          },
          "float_tubes": {
            "purpose": "eliminate body contact",
            "waders_or_wetsuit_required": true
          },
          "self_bailing_sea_kayaks": {
            "minimum_clothing": "short wetsuit",
            "pre_entry_shower_required": true
          },
          "windsurfers_and_paddleboarders": {
            "minimum_clothing": "short wetsuit",
            "pre_entry_shower_minutes": 2
          }
        }
      },
      "evidence": [
        {
          "claim_id": "claim-contra-loma-water-contact-rules",
          "evidence_id": "evidence-contra-loma-water-contact-rules",
          "notes": "Official park guidance; current conditions require a pre-trip recheck.",
          "observation_id": "observation-ebrpd-contra-loma-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-contra-loma-water-rules-20260922",
          "observed_at": null,
          "observer": "Wayproof live source review",
          "retrieved_at": "2026-09-22T20:00:00+00:00",
          "source_id": "source-ebrpd-contra-loma-park-page"
        }
      ],
      "sources": [
        {
          "locator": "https://www.ebparks.org/parks/contra-loma",
          "publisher": "East Bay Regional Park District",
          "source_id": "source-ebrpd-contra-loma-park-page"
        }
      ]
    }
  ],
  "entities": [
    {
      "entity_id": "park-contra-loma-regional-park",
      "kind": "park",
      "name": "Contra Loma Regional Park"
    },
    {
      "entity_id": "route-contra-loma-lake-view-trail",
      "kind": "route",
      "name": "Contra Loma Lake View Trail"
    }
  ],
  "history": [
    {
      "action": "ADD",
      "change_set_id": "wp-20260920-ebrpd-parks-batch-06",
      "evidence_refs": [],
      "knowledge_gap_refs": [],
      "path": "canonical/v0/sources/source-ebrpd-contra-loma-park-page.json",
      "reason": "Add a deduplicated planning profile from the live EBRPD preserve page reviewed on 2026-09-20.",
      "record_id": "source-ebrpd-contra-loma-park-page",
      "record_type": "source",
      "summary": "Add four additional previously uncaptured EBRPD park visitor profiles."
    }
  ],
  "navigation": {
    "next_id": "source-ebrpd-coyote-hills-park-page",
    "position": 23,
    "previous_id": "source-ebrpd-claremont-canyon-park-page",
    "total": 587
  },
  "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-contra-loma-visitor-profile",
      "observed_at": null,
      "observer": "Wayproof live source review",
      "retrieved_at": "2026-09-20T07:00:00+00:00",
      "source_id": "source-ebrpd-contra-loma-park-page"
    },
    {
      "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-contra-loma-water-rules-20260922",
      "observed_at": null,
      "observer": "Wayproof live source review",
      "retrieved_at": "2026-09-22T20:00:00+00:00",
      "source_id": "source-ebrpd-contra-loma-park-page"
    }
  ],
  "record": {
    "locator": "https://www.ebparks.org/parks/contra-loma",
    "publisher": "East Bay Regional Park District",
    "source_id": "source-ebrpd-contra-loma-park-page"
  },
  "record_type": "source",
  "related_records": [],
  "sources": [
    {
      "locator": "https://www.ebparks.org/parks/contra-loma",
      "publisher": "East Bay Regional Park District",
      "source_id": "source-ebrpd-contra-loma-park-page"
    }
  ]
}