{
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        "evidence_ids": [
          "evidence-del-valle-ebrpd-park-area"
        ],
        "predicate": "published_area_acres",
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        ],
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      },
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        {
          "claim_id": "claim-del-valle-ebrpd-park-area",
          "evidence_id": "evidence-del-valle-ebrpd-park-area",
          "notes": "",
          "observation_id": "observation-del-valle-ebrpd-identity",
          "stance": "supports"
        }
      ],
      "observations": [
        {
          "artifact_refs": [],
          "content": "The EBRPD page places Del Valle ten miles south of Livermore, describes a five-mile lake in a 4,395-acre park, gives the address 7000 Del Valle Road, and calls the park the eastern gateway to the 28-mile Ohlone Wilderness Trail.",
          "observation_id": "observation-del-valle-ebrpd-identity",
          "observed_at": null,
          "observer": "user-supplied page transcription",
          "retrieved_at": "2026-09-20T00:00:00+00:00",
          "source_id": "source-ebrpd-del-valle-park-page"
        }
      ],
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        {
          "locator": "https://www.ebparks.org/parks/del-valle",
          "publisher": "East Bay Regional Park District",
          "source_id": "source-ebrpd-del-valle-park-page"
        }
      ]
    },
    {
      "claim": {
        "claim_id": "claim-del-valle-lake-length",
        "evidence_ids": [
          "evidence-del-valle-lake-length",
          "evidence-del-valle-ebrpd-lake-length"
        ],
        "predicate": "published_length_miles",
        "spatial_scope_ids": [
          "scope-lake-del-valle"
        ],
        "subject_id": "lake-del-valle",
        "temporal_scope": null,
        "value": 5
      },
      "evidence": [
        {
          "claim_id": "claim-del-valle-lake-length",
          "evidence_id": "evidence-del-valle-lake-length",
          "notes": "",
          "observation_id": "observation-del-valle-identity-location",
          "stance": "supports"
        },
        {
          "claim_id": "claim-del-valle-lake-length",
          "evidence_id": "evidence-del-valle-ebrpd-lake-length",
          "notes": "",
          "observation_id": "observation-del-valle-ebrpd-identity",
          "stance": "supports"
        }
      ],
      "observations": [
        {
          "artifact_refs": [],
          "content": "The page identifies Del Valle Regional Park as an East Bay Regional Park District park about ten miles south of Livermore, with a 4,316-acre park around a five-mile-long lake; it lists 7000 Del Valle Road, Livermore, California 94550 and coordinates 37.56917, -121.68722.",
          "observation_id": "observation-del-valle-identity-location",
          "observed_at": null,
          "observer": "user-supplied page transcription",
          "retrieved_at": "2026-09-20T00:00:00+00:00",
          "source_id": "source-reserveamerica-del-valle-overview-110003"
        },
        {
          "artifact_refs": [],
          "content": "The EBRPD page places Del Valle ten miles south of Livermore, describes a five-mile lake in a 4,395-acre park, gives the address 7000 Del Valle Road, and calls the park the eastern gateway to the 28-mile Ohlone Wilderness Trail.",
          "observation_id": "observation-del-valle-ebrpd-identity",
          "observed_at": null,
          "observer": "user-supplied page transcription",
          "retrieved_at": "2026-09-20T00:00:00+00:00",
          "source_id": "source-ebrpd-del-valle-park-page"
        }
      ],
      "sources": [
        {
          "locator": "https://www.reserveamerica.com/explore/del-valle/EB/110003/overview",
          "publisher": "ReserveAmerica / East Bay Regional Park District",
          "source_id": "source-reserveamerica-del-valle-overview-110003"
        },
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          "locator": "https://www.ebparks.org/parks/del-valle",
          "publisher": "East Bay Regional Park District",
          "source_id": "source-ebrpd-del-valle-park-page"
        }
      ]
    },
    {
      "claim": {
        "claim_id": "claim-del-valle-ohlone-gateway",
        "evidence_ids": [
          "evidence-del-valle-ohlone-gateway",
          "evidence-del-valle-ebrpd-ohlone-gateway",
          "evidence-ebrpd-ohlone-gateway-current"
        ],
        "predicate": "eastern_gateway",
        "spatial_scope_ids": [
          "scope-del-valle-park"
        ],
        "subject_id": "trail-ohlone-wilderness",
        "temporal_scope": null,
        "value": "park-del-valle-regional-park"
      },
      "evidence": [
        {
          "claim_id": "claim-del-valle-ohlone-gateway",
          "evidence_id": "evidence-del-valle-ohlone-gateway",
          "notes": "",
          "observation_id": "observation-del-valle-ohlone-permit-statement",
          "stance": "supports"
        },
        {
          "claim_id": "claim-del-valle-ohlone-gateway",
          "evidence_id": "evidence-del-valle-ebrpd-ohlone-gateway",
          "notes": "",
          "observation_id": "observation-del-valle-ebrpd-identity",
          "stance": "supports"
        },
        {
          "claim_id": "claim-del-valle-ohlone-gateway",
          "evidence_id": "evidence-ebrpd-ohlone-gateway-current",
          "notes": "",
          "observation_id": "observation-ebrpd-ohlone-trail",
          "stance": "supports"
        }
      ],
      "observations": [
        {
          "artifact_refs": [],
          "content": "The page calls Del Valle the eastern gateway to the Ohlone Wilderness Trail, describes the trail as 28 miles connecting to Sunol and Mission Peak, and states that permits are required on portions and may be purchased at the park entrance kiosk; it separately states that backpack reservations remain available.",
          "observation_id": "observation-del-valle-ohlone-permit-statement",
          "observed_at": null,
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          "source_id": "source-reserveamerica-del-valle-overview-110003"
        },
        {
          "artifact_refs": [],
          "content": "The EBRPD page places Del Valle ten miles south of Livermore, describes a five-mile lake in a 4,395-acre park, gives the address 7000 Del Valle Road, and calls the park the eastern gateway to the 28-mile Ohlone Wilderness Trail.",
          "observation_id": "observation-del-valle-ebrpd-identity",
          "observed_at": null,
          "observer": "user-supplied page transcription",
          "retrieved_at": "2026-09-20T00:00:00+00:00",
          "source_id": "source-ebrpd-del-valle-park-page"
        },
        {
          "artifact_refs": [],
          "content": "The 28-mile Ohlone Wilderness Trail is open to hikers and equestrians, not bicycles or motor vehicles, and crosses Ohlone Wilderness, Mission Peak, Sunol, Del Valle, and leased watershed lands where users must stay in the trail corridor.",
          "observation_id": "observation-ebrpd-ohlone-trail",
          "observed_at": null,
          "observer": "Wayproof source review",
          "retrieved_at": "2026-09-20T00:00:00+00:00",
          "source_id": "source-ebrpd-ohlone-park-page"
        }
      ],
      "sources": [
        {
          "locator": "https://www.reserveamerica.com/explore/del-valle/EB/110003/overview",
          "publisher": "ReserveAmerica / East Bay Regional Park District",
          "source_id": "source-reserveamerica-del-valle-overview-110003"
        },
        {
          "locator": "https://www.ebparks.org/parks/del-valle",
          "publisher": "East Bay Regional Park District",
          "source_id": "source-ebrpd-del-valle-park-page"
        },
        {
          "locator": "https://www.ebparks.org/parks/ohlone",
          "publisher": "East Bay Regional Park District",
          "source_id": "source-ebrpd-ohlone-park-page"
        }
      ]
    },
    {
      "claim": {
        "claim_id": "claim-del-valle-park-address",
        "evidence_ids": [
          "evidence-del-valle-park-address",
          "evidence-del-valle-ebrpd-park-address"
        ],
        "predicate": "street_address",
        "spatial_scope_ids": [
          "scope-del-valle-park"
        ],
        "subject_id": "park-del-valle-regional-park",
        "temporal_scope": null,
        "value": "7000 Del Valle Road, Livermore, CA 94550"
      },
      "evidence": [
        {
          "claim_id": "claim-del-valle-park-address",
          "evidence_id": "evidence-del-valle-park-address",
          "notes": "",
          "observation_id": "observation-del-valle-identity-location",
          "stance": "supports"
        },
        {
          "claim_id": "claim-del-valle-park-address",
          "evidence_id": "evidence-del-valle-ebrpd-park-address",
          "notes": "",
          "observation_id": "observation-del-valle-ebrpd-identity",
          "stance": "supports"
        }
      ],
      "observations": [
        {
          "artifact_refs": [],
          "content": "The page identifies Del Valle Regional Park as an East Bay Regional Park District park about ten miles south of Livermore, with a 4,316-acre park around a five-mile-long lake; it lists 7000 Del Valle Road, Livermore, California 94550 and coordinates 37.56917, -121.68722.",
          "observation_id": "observation-del-valle-identity-location",
          "observed_at": null,
          "observer": "user-supplied page transcription",
          "retrieved_at": "2026-09-20T00:00:00+00:00",
          "source_id": "source-reserveamerica-del-valle-overview-110003"
        },
        {
          "artifact_refs": [],
          "content": "The EBRPD page places Del Valle ten miles south of Livermore, describes a five-mile lake in a 4,395-acre park, gives the address 7000 Del Valle Road, and calls the park the eastern gateway to the 28-mile Ohlone Wilderness Trail.",
          "observation_id": "observation-del-valle-ebrpd-identity",
          "observed_at": null,
          "observer": "user-supplied page transcription",
          "retrieved_at": "2026-09-20T00:00:00+00:00",
          "source_id": "source-ebrpd-del-valle-park-page"
        }
      ],
      "sources": [
        {
          "locator": "https://www.reserveamerica.com/explore/del-valle/EB/110003/overview",
          "publisher": "ReserveAmerica / East Bay Regional Park District",
          "source_id": "source-reserveamerica-del-valle-overview-110003"
        },
        {
          "locator": "https://www.ebparks.org/parks/del-valle",
          "publisher": "East Bay Regional Park District",
          "source_id": "source-ebrpd-del-valle-park-page"
        }
      ]
    }
  ],
  "entities": [
    {
      "entity_id": "lake-del-valle",
      "kind": "lake",
      "name": "Lake Del Valle"
    },
    {
      "entity_id": "park-del-valle-regional-park",
      "kind": "park",
      "name": "Del Valle Regional Park"
    },
    {
      "entity_id": "trail-ohlone-wilderness",
      "kind": "trail",
      "name": "Ohlone Wilderness Trail"
    }
  ],
  "history": [
    {
      "action": "ADD",
      "change_set_id": "wp-20260920-del-valle-ebrpd-park-page",
      "evidence_refs": [],
      "knowledge_gap_refs": [],
      "path": "canonical/v0/observations/observation-del-valle-ebrpd-identity.json",
      "reason": "Add EBRPD park-page evidence, preserve conflicts, and refine current Del Valle knowledge.",
      "record_id": "observation-del-valle-ebrpd-identity",
      "record_type": "observation",
      "summary": "Add EBRPD Del Valle park-page evidence, corroborate the 150-site campground inventory, preserve the acreage conflict, and capture dated operational conditions and rechecks."
    }
  ],
  "navigation": {
    "next_id": "observation-del-valle-ebrpd-seasonal-stores",
    "position": 22,
    "previous_id": "observation-del-valle-ebrpd-hours",
    "total": 1318
  },
  "observations": [
    {
      "artifact_refs": [],
      "content": "The EBRPD page places Del Valle ten miles south of Livermore, describes a five-mile lake in a 4,395-acre park, gives the address 7000 Del Valle Road, and calls the park the eastern gateway to the 28-mile Ohlone Wilderness Trail.",
      "observation_id": "observation-del-valle-ebrpd-identity",
      "observed_at": null,
      "observer": "user-supplied page transcription",
      "retrieved_at": "2026-09-20T00:00:00+00:00",
      "source_id": "source-ebrpd-del-valle-park-page"
    }
  ],
  "record": {
    "artifact_refs": [],
    "content": "The EBRPD page places Del Valle ten miles south of Livermore, describes a five-mile lake in a 4,395-acre park, gives the address 7000 Del Valle Road, and calls the park the eastern gateway to the 28-mile Ohlone Wilderness Trail.",
    "observation_id": "observation-del-valle-ebrpd-identity",
    "observed_at": null,
    "observer": "user-supplied page transcription",
    "retrieved_at": "2026-09-20T00:00:00+00:00",
    "source_id": "source-ebrpd-del-valle-park-page"
  },
  "record_type": "observation",
  "related_records": [],
  "sources": [
    {
      "locator": "https://www.ebparks.org/parks/del-valle",
      "publisher": "East Bay Regional Park District",
      "source_id": "source-ebrpd-del-valle-park-page"
    }
  ]
}