{
  "claims": [
    {
      "claim": {
        "claim_id": "claim-del-valle-ebrpd-contra-loma-quarantine",
        "evidence_ids": [
          "evidence-del-valle-ebrpd-contra-loma-quarantine",
          "evidence-ebrpd-mussels-contra-loma-quarantine"
        ],
        "predicate": "cross_lake_boat_quarantine",
        "spatial_scope_ids": [
          "scope-lake-del-valle"
        ],
        "subject_id": "lake-del-valle",
        "temporal_scope": {
          "ends_on": "2026-09-20",
          "starts_on": "2026-09-20"
        },
        "value": {
          "duration_days": 30,
          "restricted_destination": "Lake Del Valle",
          "trigger_lake": "Contra Loma Reservoir"
        }
      },
      "evidence": [
        {
          "claim_id": "claim-del-valle-ebrpd-contra-loma-quarantine",
          "evidence_id": "evidence-del-valle-ebrpd-contra-loma-quarantine",
          "notes": "",
          "observation_id": "observation-del-valle-ebrpd-golden-mussel",
          "stance": "supports"
        },
        {
          "claim_id": "claim-del-valle-ebrpd-contra-loma-quarantine",
          "evidence_id": "evidence-ebrpd-mussels-contra-loma-quarantine",
          "notes": "",
          "observation_id": "observation-ebrpd-mussels-contra-loma",
          "stance": "supports"
        }
      ],
      "observations": [
        {
          "artifact_refs": [],
          "content": "At retrieval, the page stated that a boat launched at Contra Loma would be quarantined for 30 days from inspected lakes including Del Valle; vessels must be cleaned, drained, and dried, and boat bands are honored only by the lake that issued them. It also requires campground guests with watercraft to complete inspection before campground check-in.",
          "observation_id": "observation-del-valle-ebrpd-golden-mussel",
          "observed_at": "2026-09-20T00:00:00+00:00",
          "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 current notice reports golden mussels at Contra Loma and states that a boat launched there is quarantined for 30 days from inspected lakes including Del Valle. All vessels should be cleaned, drained, and dried, and bands are honored only at their issuing lake.",
          "observation_id": "observation-ebrpd-mussels-contra-loma",
          "observed_at": "2026-09-20T00:00:00+00:00",
          "observer": "user-supplied page transcription",
          "retrieved_at": "2026-09-20T00:00:00+00:00",
          "source_id": "source-ebrpd-invasive-mussel-program"
        }
      ],
      "sources": [
        {
          "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/recreation/boating/invasive-mussels",
          "publisher": "East Bay Regional Park District",
          "source_id": "source-ebrpd-invasive-mussel-program"
        }
      ]
    }
  ],
  "entities": [
    {
      "entity_id": "lake-del-valle",
      "kind": "lake",
      "name": "Lake Del Valle"
    }
  ],
  "history": [
    {
      "action": "ADD",
      "change_set_id": "wp-20260920-del-valle-ebrpd-park-page",
      "evidence_refs": [
        "evidence-del-valle-ebrpd-contra-loma-quarantine"
      ],
      "knowledge_gap_refs": [],
      "path": "canonical/v0/claims/claim-del-valle-ebrpd-contra-loma-quarantine.json",
      "reason": "Add EBRPD park-page evidence, preserve conflicts, and refine current Del Valle knowledge.",
      "record_id": "claim-del-valle-ebrpd-contra-loma-quarantine",
      "record_type": "claim",
      "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."
    },
    {
      "action": "REPLACE",
      "change_set_id": "wp-20260920-ebrpd-invasive-mussel-program",
      "evidence_refs": [
        "evidence-del-valle-ebrpd-contra-loma-quarantine",
        "evidence-ebrpd-mussels-contra-loma-quarantine"
      ],
      "knowledge_gap_refs": [],
      "path": "canonical/v0/claims/claim-del-valle-ebrpd-contra-loma-quarantine.json",
      "reason": "Add EBRPD invasive-mussel inspection evidence and equipment-context rules.",
      "record_id": "claim-del-valle-ebrpd-contra-loma-quarantine",
      "record_type": "claim",
      "summary": "Add the EBRPD invasive-mussel program as the equipment and prior-waterbody fixture, including inspection, failure, banding, fee, and wet-weather semantics."
    }
  ],
  "navigation": {
    "next_id": "claim-del-valle-ebrpd-east-beach-algae",
    "position": 136,
    "previous_id": "claim-del-valle-ebrpd-concession-rocky-mountain",
    "total": 3965
  },
  "observations": [
    {
      "artifact_refs": [],
      "content": "At retrieval, the page stated that a boat launched at Contra Loma would be quarantined for 30 days from inspected lakes including Del Valle; vessels must be cleaned, drained, and dried, and boat bands are honored only by the lake that issued them. It also requires campground guests with watercraft to complete inspection before campground check-in.",
      "observation_id": "observation-del-valle-ebrpd-golden-mussel",
      "observed_at": "2026-09-20T00:00:00+00:00",
      "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 current notice reports golden mussels at Contra Loma and states that a boat launched there is quarantined for 30 days from inspected lakes including Del Valle. All vessels should be cleaned, drained, and dried, and bands are honored only at their issuing lake.",
      "observation_id": "observation-ebrpd-mussels-contra-loma",
      "observed_at": "2026-09-20T00:00:00+00:00",
      "observer": "user-supplied page transcription",
      "retrieved_at": "2026-09-20T00:00:00+00:00",
      "source_id": "source-ebrpd-invasive-mussel-program"
    }
  ],
  "record": {
    "claim_id": "claim-del-valle-ebrpd-contra-loma-quarantine",
    "evidence_ids": [
      "evidence-del-valle-ebrpd-contra-loma-quarantine",
      "evidence-ebrpd-mussels-contra-loma-quarantine"
    ],
    "predicate": "cross_lake_boat_quarantine",
    "spatial_scope_ids": [
      "scope-lake-del-valle"
    ],
    "subject_id": "lake-del-valle",
    "temporal_scope": {
      "ends_on": "2026-09-20",
      "starts_on": "2026-09-20"
    },
    "value": {
      "duration_days": 30,
      "restricted_destination": "Lake Del Valle",
      "trigger_lake": "Contra Loma Reservoir"
    }
  },
  "record_type": "claim",
  "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"
    },
    {
      "locator": "https://www.ebparks.org/recreation/boating/invasive-mussels",
      "publisher": "East Bay Regional Park District",
      "source_id": "source-ebrpd-invasive-mussel-program"
    }
  ]
}