{
  "claims": [
    {
      "claim": {
        "claim_id": "claim-black-diamond-camps-official",
        "evidence_ids": [
          "evidence-black-diamond-camps-official"
        ],
        "predicate": "site_inventory",
        "spatial_scope_ids": [
          "scope-black-diamond-mines-regional-preserve"
        ],
        "subject_id": "park-black-diamond-mines-regional-preserve",
        "temporal_scope": null,
        "value": {
          "star_mine": {
            "maximum_cars": 8,
            "maximum_nights": 2,
            "maximum_people": 35,
            "minimum_advance_business_days": 3,
            "picnic_tables": true,
            "pit_toilet": true,
            "site_id": "group-camp-black-diamond-star-mine",
            "water_available": false
          },
          "stewartville": {
            "hike_in_distance_miles": 3.2,
            "maximum_nights": 2,
            "maximum_people": 20,
            "minimum_advance_business_days": 2,
            "picnic_tables": true,
            "pit_toilet": true,
            "site_id": "backpack-camp-black-diamond-stewartville",
            "water": "non_potable_treat_before_human_use"
          }
        }
      },
      "evidence": [
        {
          "claim_id": "claim-black-diamond-camps-official",
          "evidence_id": "evidence-black-diamond-camps-official",
          "notes": "Official park camping details.",
          "observation_id": "observation-ebrpd-black-diamond-camping-20260922",
          "stance": "supports"
        }
      ],
      "observations": [
        {
          "artifact_refs": [
            "Camping"
          ],
          "content": "Star Mine is an organized educational group camp for up to 35, two-night maximum, eight cars, picnic tables, pit toilet, no water, and three-business-day booking. Stewartville holds 20, is 3.2 miles from headquarters, has picnic tables, pit toilet and non-potable horse water, a two-night maximum, and two-business-day booking.",
          "observation_id": "observation-ebrpd-black-diamond-camping-20260922",
          "observed_at": null,
          "observer": "Wayproof web source review",
          "retrieved_at": "2026-09-22T00:00:00-07:00",
          "source_id": "source-ebrpd-black-diamond-park-page"
        }
      ],
      "sources": [
        {
          "locator": "https://www.ebparks.org/parks/black-diamond",
          "publisher": "East Bay Regional Park District",
          "source_id": "source-ebrpd-black-diamond-park-page"
        }
      ]
    },
    {
      "claim": {
        "claim_id": "claim-black-diamond-visitor-profile",
        "evidence_ids": [
          "evidence-ebrpd-black-diamond-visitor-profile"
        ],
        "predicate": "visitor_profile",
        "spatial_scope_ids": [
          "scope-black-diamond-mines-regional-preserve"
        ],
        "subject_id": "park-black-diamond-mines-regional-preserve",
        "temporal_scope": null,
        "value": {
          "acreage": 8533,
          "address": "5175 Somersville Road, Antioch, CA 94509",
          "camping": {
            "Star Mine Group Camp": {
              "capacity": 35,
              "minimum_advance_business_days": 3,
              "pit_toilet": true,
              "water": false
            },
            "Stewartville Backpack Camp": {
              "capacity": 20,
              "distance_from_headquarters_miles": 3.2,
              "minimum_advance_business_days": 2,
              "pit_toilet": true,
              "water": "non-potable horse water; treat for human use"
            }
          },
          "mine_access": "Beyond the visitor center only through the Coal Mine Experience; minimum age 7",
          "parking_fee_condition": "when kiosk is attended; seasonal weekends and some holidays",
          "parking_fee_usd": 5,
          "seasonal_gate_hours": "08:00 opening; closing varies from 17:00 to 20:00 by published date bands"
        }
      },
      "evidence": [
        {
          "claim_id": "claim-black-diamond-visitor-profile",
          "evidence_id": "evidence-ebrpd-black-diamond-visitor-profile",
          "notes": "Direct transcription and conservative structuring of planning-relevant fields from the official park page.",
          "observation_id": "observation-ebrpd-black-diamond-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-black-diamond-visitor-profile",
          "observed_at": null,
          "observer": "Wayproof live source review",
          "retrieved_at": "2026-09-20T07:00:00+00:00",
          "source_id": "source-ebrpd-black-diamond-park-page"
        }
      ],
      "sources": [
        {
          "locator": "https://www.ebparks.org/parks/black-diamond",
          "publisher": "East Bay Regional Park District",
          "source_id": "source-ebrpd-black-diamond-park-page"
        }
      ]
    }
  ],
  "entities": [
    {
      "entity_id": "park-black-diamond-mines-regional-preserve",
      "kind": "park",
      "name": "Black Diamond Mines Regional Preserve"
    }
  ],
  "history": [
    {
      "action": "ADD",
      "change_set_id": "wp-20260920-ebrpd-preserves-batch-01",
      "evidence_refs": [],
      "knowledge_gap_refs": [],
      "path": "canonical/v0/sources/source-ebrpd-black-diamond-park-page.json",
      "reason": "Add a deduplicated planning profile from the live EBRPD preserve page reviewed on 2026-09-20.",
      "record_id": "source-ebrpd-black-diamond-park-page",
      "record_type": "source",
      "summary": "Add four previously uncaptured EBRPD preserve visitor profiles."
    }
  ],
  "navigation": {
    "next_id": "source-ebrpd-blue-green-algae",
    "position": 13,
    "previous_id": "source-ebrpd-bishop-ranch-park-page",
    "total": 587
  },
  "observations": [
    {
      "artifact_refs": [
        "Camping"
      ],
      "content": "Star Mine is an organized educational group camp for up to 35, two-night maximum, eight cars, picnic tables, pit toilet, no water, and three-business-day booking. Stewartville holds 20, is 3.2 miles from headquarters, has picnic tables, pit toilet and non-potable horse water, a two-night maximum, and two-business-day booking.",
      "observation_id": "observation-ebrpd-black-diamond-camping-20260922",
      "observed_at": null,
      "observer": "Wayproof web source review",
      "retrieved_at": "2026-09-22T00:00:00-07:00",
      "source_id": "source-ebrpd-black-diamond-park-page"
    },
    {
      "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-black-diamond-visitor-profile",
      "observed_at": null,
      "observer": "Wayproof live source review",
      "retrieved_at": "2026-09-20T07:00:00+00:00",
      "source_id": "source-ebrpd-black-diamond-park-page"
    }
  ],
  "record": {
    "locator": "https://www.ebparks.org/parks/black-diamond",
    "publisher": "East Bay Regional Park District",
    "source_id": "source-ebrpd-black-diamond-park-page"
  },
  "record_type": "source",
  "related_records": [],
  "sources": [
    {
      "locator": "https://www.ebparks.org/parks/black-diamond",
      "publisher": "East Bay Regional Park District",
      "source_id": "source-ebrpd-black-diamond-park-page"
    }
  ]
}