{
  "answerability": "evidence_backed_claims_available",
  "claims": [
    {
      "claim": {
        "claim_id": "claim-del-valle-boat-inspection",
        "evidence_ids": [
          "evidence-del-valle-boat-inspection",
          "evidence-del-valle-ebrpd-boat-inspection",
          "evidence-ebrpd-mussels-del-valle-inspection"
        ],
        "predicate": "boat_inspection_required",
        "spatial_scope_ids": [
          "scope-lake-del-valle"
        ],
        "subject_id": "lake-del-valle",
        "temporal_scope": null,
        "value": true
      },
      "evidence": [
        {
          "claim_id": "claim-del-valle-boat-inspection",
          "evidence_id": "evidence-del-valle-boat-inspection",
          "notes": "",
          "observation_id": "observation-del-valle-boating-swimming",
          "stance": "supports"
        },
        {
          "claim_id": "claim-del-valle-boat-inspection",
          "evidence_id": "evidence-del-valle-ebrpd-boat-inspection",
          "notes": "",
          "observation_id": "observation-del-valle-ebrpd-golden-mussel",
          "stance": "supports"
        },
        {
          "claim_id": "claim-del-valle-boat-inspection",
          "evidence_id": "evidence-ebrpd-mussels-del-valle-inspection",
          "notes": "",
          "observation_id": "observation-ebrpd-mussels-program-scope",
          "stance": "supports"
        }
      ],
      "observations": [
        {
          "artifact_refs": [],
          "content": "The page lists two swimming beaches, lifeguards during posted periods, boat rentals, and a public launch for boats of any size; it warns that boaters must comply with the Invasive Mussel Prevention Program and mandatory inspections.",
          "observation_id": "observation-del-valle-boating-swimming",
          "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": "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": "EBRPD requires watercraft inspection at Contra Loma, Del Valle, Lake Chabot, Quarry Lakes, and Shadow Cliffs. Covered craft include boats, kayaks, canoes, sailboats, inflatable craft, and every form of floating board. Campers with watercraft must complete inspection before campground check-in.",
          "observation_id": "observation-ebrpd-mussels-program-scope",
          "observed_at": null,
          "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.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/recreation/boating/invasive-mussels",
          "publisher": "East Bay Regional Park District",
          "source_id": "source-ebrpd-invasive-mussel-program"
        }
      ],
      "subject": {
        "entity_id": "lake-del-valle",
        "kind": "lake",
        "name": "Lake Del Valle"
      }
    },
    {
      "claim": {
        "claim_id": "claim-del-valle-ordinance-boat-operating-rules",
        "evidence_ids": [
          "evidence-del-valle-ordinance-boat-operating-rules"
        ],
        "predicate": "boat_operating_rules",
        "spatial_scope_ids": [
          "scope-lake-del-valle"
        ],
        "subject_id": "lake-del-valle",
        "temporal_scope": {
          "ends_on": null,
          "starts_on": "2023-09-01"
        },
        "value": {
          "gasoline_or_oil_pollution_allowed": false,
          "hours": "sunrise_to_sunset_or_posted",
          "maximum_speed_mph": 10,
          "towed_persons_allowed": false
        }
      },
      "evidence": [
        {
          "claim_id": "claim-del-valle-ordinance-boat-operating-rules",
          "evidence_id": "evidence-del-valle-ordinance-boat-operating-rules",
          "notes": "",
          "observation_id": "observation-ebrpd-ordinance-38-del-valle-boating",
          "stance": "supports"
        }
      ],
      "observations": [
        {
          "artifact_refs": [
            "PDF pages 16, 18-19"
          ],
          "content": "Sections 501.2 and 503.4-503.9 allow car-top and trailered boats at Del Valle without size restriction; limit use to sunrise-sunset or posted hours; cap gasoline-powered boats at 10 mph; prohibit towing people and fuel/oil pollution; and regulate proximity to swim areas and swimmers.",
          "observation_id": "observation-ebrpd-ordinance-38-del-valle-boating",
          "observed_at": "2023-09-01T00:00:00+00:00",
          "observer": "Wayproof source review",
          "retrieved_at": "2026-09-20T00:00:00+00:00",
          "source_id": "source-ebrpd-ordinance-38-september-2023"
        }
      ],
      "sources": [
        {
          "locator": "https://www.ebparks.org/sites/default/files/Ord38-09052023FINAL.pdf",
          "publisher": "East Bay Regional Park District",
          "source_id": "source-ebrpd-ordinance-38-september-2023"
        }
      ],
      "subject": {
        "entity_id": "lake-del-valle",
        "kind": "lake",
        "name": "Lake Del Valle"
      }
    },
    {
      "claim": {
        "claim_id": "claim-del-valle-ebrpd-boat-speed",
        "evidence_ids": [
          "evidence-del-valle-ebrpd-boat-speed",
          "evidence-ordinance38-del-valle-boat-speed"
        ],
        "predicate": "boat_speed_limit_mph",
        "spatial_scope_ids": [
          "scope-lake-del-valle"
        ],
        "subject_id": "lake-del-valle",
        "temporal_scope": null,
        "value": 10
      },
      "evidence": [
        {
          "claim_id": "claim-del-valle-ebrpd-boat-speed",
          "evidence_id": "evidence-del-valle-ebrpd-boat-speed",
          "notes": "",
          "observation_id": "observation-del-valle-ebrpd-boating",
          "stance": "supports"
        },
        {
          "claim_id": "claim-del-valle-ebrpd-boat-speed",
          "evidence_id": "evidence-ordinance38-del-valle-boat-speed",
          "notes": "Section 503.6(a).",
          "observation_id": "observation-ebrpd-ordinance-38-del-valle-boating",
          "stance": "supports"
        }
      ],
      "observations": [
        {
          "artifact_refs": [],
          "content": "The page lists launch and inspection fees of $5 and $10 for motorized vessels and $3 and $5 for non-motorized vessels, a lake-wide 10 mph speed limit, and a prohibition on hydrofoils and E-Foils. It permits any-size boats at the public ramp.",
          "observation_id": "observation-del-valle-ebrpd-boating",
          "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": [
            "PDF pages 16, 18-19"
          ],
          "content": "Sections 501.2 and 503.4-503.9 allow car-top and trailered boats at Del Valle without size restriction; limit use to sunrise-sunset or posted hours; cap gasoline-powered boats at 10 mph; prohibit towing people and fuel/oil pollution; and regulate proximity to swim areas and swimmers.",
          "observation_id": "observation-ebrpd-ordinance-38-del-valle-boating",
          "observed_at": "2023-09-01T00:00:00+00:00",
          "observer": "Wayproof source review",
          "retrieved_at": "2026-09-20T00:00:00+00:00",
          "source_id": "source-ebrpd-ordinance-38-september-2023"
        }
      ],
      "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/sites/default/files/Ord38-09052023FINAL.pdf",
          "publisher": "East Bay Regional Park District",
          "source_id": "source-ebrpd-ordinance-38-september-2023"
        }
      ],
      "subject": {
        "entity_id": "lake-del-valle",
        "kind": "lake",
        "name": "Lake Del Valle"
      }
    },
    {
      "claim": {
        "claim_id": "claim-ebrpd-boat-swimmer-separation",
        "evidence_ids": [
          "evidence-ebrpd-boat-swimmer-separation"
        ],
        "predicate": "boat_swimmer_separation_feet",
        "spatial_scope_ids": [
          "scope-lake-del-valle"
        ],
        "subject_id": "lake-del-valle",
        "temporal_scope": {
          "ends_on": null,
          "starts_on": "2023-09-01"
        },
        "value": {
          "minimum": 100,
          "open_lake_del_valle_exception": "unless_otherwise_posted"
        }
      },
      "evidence": [
        {
          "claim_id": "claim-ebrpd-boat-swimmer-separation",
          "evidence_id": "evidence-ebrpd-boat-swimmer-separation",
          "notes": "",
          "observation_id": "observation-ebrpd-ordinance-38-del-valle-boating",
          "stance": "supports"
        }
      ],
      "observations": [
        {
          "artifact_refs": [
            "PDF pages 16, 18-19"
          ],
          "content": "Sections 501.2 and 503.4-503.9 allow car-top and trailered boats at Del Valle without size restriction; limit use to sunrise-sunset or posted hours; cap gasoline-powered boats at 10 mph; prohibit towing people and fuel/oil pollution; and regulate proximity to swim areas and swimmers.",
          "observation_id": "observation-ebrpd-ordinance-38-del-valle-boating",
          "observed_at": "2023-09-01T00:00:00+00:00",
          "observer": "Wayproof source review",
          "retrieved_at": "2026-09-20T00:00:00+00:00",
          "source_id": "source-ebrpd-ordinance-38-september-2023"
        }
      ],
      "sources": [
        {
          "locator": "https://www.ebparks.org/sites/default/files/Ord38-09052023FINAL.pdf",
          "publisher": "East Bay Regional Park District",
          "source_id": "source-ebrpd-ordinance-38-september-2023"
        }
      ],
      "subject": {
        "entity_id": "lake-del-valle",
        "kind": "lake",
        "name": "Lake Del Valle"
      }
    },
    {
      "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"
        }
      ],
      "subject": {
        "entity_id": "lake-del-valle",
        "kind": "lake",
        "name": "Lake Del Valle"
      }
    },
    {
      "claim": {
        "claim_id": "claim-ebrpd-swimming-del-valle-monitoring",
        "evidence_ids": [
          "evidence-ebrpd-swimming-del-valle-monitoring",
          "evidence-ebrpd-water-quality-del-valle-monitoring"
        ],
        "predicate": "del_valle_beach_monitoring",
        "spatial_scope_ids": [
          "scope-lake-del-valle"
        ],
        "subject_id": "program-ebrpd-hab-monitoring",
        "temporal_scope": null,
        "value": {
          "april_october": "weekly",
          "november_march": "twice_monthly",
          "sample_sites_per_beach": 2,
          "sign_inputs": [
            "bacteria",
            "blue_green_algae"
          ]
        }
      },
      "evidence": [
        {
          "claim_id": "claim-ebrpd-swimming-del-valle-monitoring",
          "evidence_id": "evidence-ebrpd-swimming-del-valle-monitoring",
          "notes": "",
          "observation_id": "observation-ebrpd-swimming-monitoring",
          "stance": "supports"
        },
        {
          "claim_id": "claim-ebrpd-swimming-del-valle-monitoring",
          "evidence_id": "evidence-ebrpd-water-quality-del-valle-monitoring",
          "notes": "",
          "observation_id": "observation-ebrpd-water-quality-program",
          "stance": "supports"
        }
      ],
      "observations": [
        {
          "artifact_refs": [],
          "content": "Del Valle beaches are sampled for bacteria weekly April-October and twice monthly November-March, with two sample sites per beach. Posted stop-light signs combine latest bacteriological tests and blue-green algae conditions.",
          "observation_id": "observation-ebrpd-swimming-monitoring",
          "observed_at": null,
          "observer": "user-supplied page transcription",
          "retrieved_at": "2026-09-20T00:00:00+00:00",
          "source_id": "source-ebrpd-del-valle-swimming"
        },
        {
          "artifact_refs": [],
          "content": "EBRPD routinely monitors recreational and drinking water, storm water, wastewater, lakes and creeks, and responds to sewage, oil, and hazardous-material incidents. Natural swim areas are sampled weekly April-October in collaboration with county environmental-health departments, with current data posted for safe recreation choices.",
          "observation_id": "observation-ebrpd-water-quality-program",
          "observed_at": null,
          "observer": "user-supplied page transcription",
          "retrieved_at": "2026-09-20T00:00:00+00:00",
          "source_id": "source-ebrpd-current-water-quality"
        }
      ],
      "sources": [
        {
          "locator": "https://www.ebparks.org/recreation/swimming/del-valle",
          "publisher": "East Bay Regional Park District",
          "source_id": "source-ebrpd-del-valle-swimming"
        },
        {
          "locator": "https://www.ebparks.org/natural-resources/water-quality",
          "publisher": "East Bay Regional Park District",
          "source_id": "source-ebrpd-current-water-quality"
        }
      ],
      "subject": {
        "entity_id": "program-ebrpd-hab-monitoring",
        "kind": "monitoring_program",
        "name": "EBRPD Harmful Algal Bloom Monitoring Program"
      }
    },
    {
      "claim": {
        "claim_id": "claim-del-valle-dog-swimming-prohibited-zone",
        "evidence_ids": [
          "evidence-del-valle-dog-swimming-prohibited-zone"
        ],
        "predicate": "dog_swimming_prohibited_area",
        "spatial_scope_ids": [
          "scope-lake-del-valle"
        ],
        "subject_id": "lake-del-valle",
        "temporal_scope": {
          "ends_on": null,
          "starts_on": "2023-09-01"
        },
        "value": "Oak Point north to East Marina"
      },
      "evidence": [
        {
          "claim_id": "claim-del-valle-dog-swimming-prohibited-zone",
          "evidence_id": "evidence-del-valle-dog-swimming-prohibited-zone",
          "notes": "",
          "observation_id": "observation-ebrpd-ordinance-38-dogs",
          "stance": "supports"
        }
      ],
      "observations": [
        {
          "artifact_refs": [
            "PDF pages 25-27"
          ],
          "content": "Sections 801.1-801.3 prohibit dog swimming at Lake Del Valle from Oak Point north to the East Marina; require leashes in developed areas including campgrounds; cap leashes at six feet and dogs at three per person; and require campground animals to be attended and leashed or confined.",
          "observation_id": "observation-ebrpd-ordinance-38-dogs",
          "observed_at": "2023-09-01T00:00:00+00:00",
          "observer": "Wayproof source review",
          "retrieved_at": "2026-09-20T00:00:00+00:00",
          "source_id": "source-ebrpd-ordinance-38-september-2023"
        }
      ],
      "sources": [
        {
          "locator": "https://www.ebparks.org/sites/default/files/Ord38-09052023FINAL.pdf",
          "publisher": "East Bay Regional Park District",
          "source_id": "source-ebrpd-ordinance-38-september-2023"
        }
      ],
      "subject": {
        "entity_id": "lake-del-valle",
        "kind": "lake",
        "name": "Lake Del Valle"
      }
    },
    {
      "claim": {
        "claim_id": "claim-ebrpd-algae-del-valle-drinking-water",
        "evidence_ids": [
          "evidence-ebrpd-algae-del-valle-drinking-water"
        ],
        "predicate": "drinking_water_bloom_testing",
        "spatial_scope_ids": [
          "scope-lake-del-valle"
        ],
        "subject_id": "lake-del-valle",
        "temporal_scope": null,
        "value": "regular"
      },
      "evidence": [
        {
          "claim_id": "claim-ebrpd-algae-del-valle-drinking-water",
          "evidence_id": "evidence-ebrpd-algae-del-valle-drinking-water",
          "notes": "",
          "observation_id": "observation-ebrpd-algae-monitoring",
          "stance": "supports"
        }
      ],
      "observations": [
        {
          "artifact_refs": [],
          "content": "EBRPD reports regular lake and shoreline monitoring with warnings and closures posted when appropriate. Drinking water from the Del Valle treatment plant is regularly tested for effects from reservoir blooms.",
          "observation_id": "observation-ebrpd-algae-monitoring",
          "observed_at": null,
          "observer": "user-supplied page transcription",
          "retrieved_at": "2026-09-20T00:00:00+00:00",
          "source_id": "source-ebrpd-blue-green-algae"
        }
      ],
      "sources": [
        {
          "locator": "https://www.ebparks.org/natural-resources/water-quality/blue-green-algae",
          "publisher": "East Bay Regional Park District",
          "source_id": "source-ebrpd-blue-green-algae"
        }
      ],
      "subject": {
        "entity_id": "lake-del-valle",
        "kind": "lake",
        "name": "Lake Del Valle"
      }
    },
    {
      "claim": {
        "claim_id": "claim-del-valle-fishing-stocking",
        "evidence_ids": [
          "evidence-del-valle-fishing-stocking"
        ],
        "predicate": "fish_stocking",
        "spatial_scope_ids": [
          "scope-lake-del-valle"
        ],
        "subject_id": "lake-del-valle",
        "temporal_scope": null,
        "value": {
          "channel_catfish": "summer",
          "rainbow_trout": "fall_through_spring"
        }
      },
      "evidence": [
        {
          "claim_id": "claim-del-valle-fishing-stocking",
          "evidence_id": "evidence-del-valle-fishing-stocking",
          "notes": "",
          "observation_id": "observation-ebrpd-fishing-stocking",
          "stance": "supports"
        }
      ],
      "observations": [
        {
          "artifact_refs": [],
          "content": "The District lists Del Valle among waters stocked with rainbow trout from fall through spring and channel catfish in summer, and manages other gamefish including bass, bluegill, sunfish, and crappie.",
          "observation_id": "observation-ebrpd-fishing-stocking",
          "observed_at": null,
          "observer": "Wayproof source review",
          "retrieved_at": "2026-09-20T00:00:00+00:00",
          "source_id": "source-ebrpd-fishing"
        }
      ],
      "sources": [
        {
          "locator": "https://www.ebparks.org/recreation/fishing",
          "publisher": "East Bay Regional Park District",
          "source_id": "source-ebrpd-fishing"
        }
      ],
      "subject": {
        "entity_id": "lake-del-valle",
        "kind": "lake",
        "name": "Lake Del Valle"
      }
    },
    {
      "claim": {
        "claim_id": "claim-del-valle-fishing-license-requirements",
        "evidence_ids": [
          "evidence-del-valle-fishing-license-requirements"
        ],
        "predicate": "fishing_credentials",
        "spatial_scope_ids": [
          "scope-lake-del-valle"
        ],
        "subject_id": "lake-del-valle",
        "temporal_scope": null,
        "value": {
          "california_license_required": true,
          "district_permit_required": true,
          "minimum_age": 16
        }
      },
      "evidence": [
        {
          "claim_id": "claim-del-valle-fishing-license-requirements",
          "evidence_id": "evidence-del-valle-fishing-license-requirements",
          "notes": "",
          "observation_id": "observation-ebrpd-fishing-licenses",
          "stance": "supports"
        }
      ],
      "observations": [
        {
          "artifact_refs": [],
          "content": "Anglers age 16 or older need a California fishing license for eligible District inland waters and a District fishing permit unless fishing at one of four named exceptions; Del Valle is not an exception. Current alerts should be checked.",
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    },
    {
      "claim": {
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        }
      ],
      "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",
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      ],
      "observations": [
        {
          "artifact_refs": [
            "PDF pages 16, 18-19"
          ],
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        }
      ],
      "observations": [
        {
          "artifact_refs": [],
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        "claim_id": "claim-del-valle-ebrpd-boating-fees",
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      },
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        }
      ],
      "observations": [
        {
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          "content": "The page lists launch and inspection fees of $5 and $10 for motorized vessels and $3 and $5 for non-motorized vessels, a lake-wide 10 mph speed limit, and a prohibition on hydrofoils and E-Foils. It permits any-size boats at the public ramp.",
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        {
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        {
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      "observations": [
        {
          "artifact_refs": [],
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        "claim_id": "claim-ebrpd-swimming-del-valle-safety",
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      ],
      "observations": [
        {
          "artifact_refs": [],
          "content": "The page advises keeping water out of the mouth, showering and towel-drying promptly after swimming, avoiding lake swimming for three days after rain, checking posted water-quality signs, and keeping dogs away from the water.",
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    {
      "claim": {
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      },
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        {
          "claim_id": "claim-ebrpd-swimming-year-round-unlifeguarded",
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      ],
      "observations": [
        {
          "artifact_refs": [],
          "content": "The Del Valle swimming page lists lifeguards 11 AM-6 PM on weekends and holidays from May 16 through September 27, two beaches, and year-round swimming without lifeguards north of the boat ramp.",
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          "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.",
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              "artifact_refs": [],
              "content": "The District lists Del Valle among waters stocked with rainbow trout from fall through spring and channel catfish in summer, and manages other gamefish including bass, bluegill, sunfish, and crappie.",
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        }
      ],
      "navigation": {
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        {
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        },
        {
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      ],
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          "claim-del-valle-fishing-stocking",
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        ]
      },
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        {
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          },
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        },
        {
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          },
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        }
      ],
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        {
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      ]
    },
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        {
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            ],
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          },
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          ],
          "observations": [
            {
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              "content": "The page lists two swimming beaches, lifeguards during posted periods, boat rentals, and a public launch for boats of any size; it warns that boaters must comply with the Invasive Mussel Prevention Program and mandatory inspections.",
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          ],
          "observations": [
            {
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            {
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        }
      ],
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      },
      "observations": [
        {
          "artifact_refs": [],
          "content": "The page lists two swimming beaches, lifeguards during posted periods, boat rentals, and a public launch for boats of any size; it warns that boaters must comply with the Invasive Mussel Prevention Program and mandatory inspections.",
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        },
        {
          "artifact_refs": [],
          "content": "The page directs visitors to check current fire-danger restrictions and blue-green algae updates before travel, and warns that flooding can cause site or park closure and reservation cancellation with email or phone notice.",
          "observation_id": "observation-del-valle-volatile-alerts",
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      ],
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          "claim-del-valle-swimming"
        ]
      },
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      "related_records": [
        {
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            ],
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            ],
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              "blue_green_algae",
              "flood_closure"
            ]
          },
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        },
        {
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            ],
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            ],
            "subject_id": "lake-del-valle",
            "temporal_scope": null,
            "value": {
              "beaches": 2,
              "lifeguards": "during posted periods"
            }
          },
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        }
      ],
      "sources": [
        {
          "locator": "https://www.reserveamerica.com/explore/del-valle/EB/110003/overview",
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          "source_id": "source-reserveamerica-del-valle-overview-110003"
        }
      ]
    }
  ],
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    {
      "action": "ADD",
      "change_set_id": "wp-20260920-del-valle-reserveamerica-foundation",
      "evidence_refs": [],
      "knowledge_gap_refs": [],
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      "reason": "Establish the source-backed Del Valle foundation from the supplied ReserveAmerica overview.",
      "record_id": "lake-del-valle",
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      "summary": "Establish Del Valle park and family-campground knowledge from the ReserveAmerica overview while preserving inventory, permit, and operational-condition uncertainty."
    },
    {
      "action": "REPLACE",
      "change_set_id": "wp-20260920-del-valle-ebrpd-park-page",
      "evidence_refs": [
        "evidence-del-valle-boat-inspection",
        "evidence-del-valle-ebrpd-boat-inspection"
      ],
      "knowledge_gap_refs": [],
      "path": "canonical/v0/claims/claim-del-valle-boat-inspection.json",
      "reason": "Add EBRPD park-page evidence, preserve conflicts, and refine current Del Valle knowledge.",
      "record_id": "claim-del-valle-boat-inspection",
      "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": "ADD",
      "change_set_id": "wp-20260920-del-valle-reserveamerica-foundation",
      "evidence_refs": [
        "evidence-del-valle-boat-inspection"
      ],
      "knowledge_gap_refs": [],
      "path": "canonical/v0/claims/claim-del-valle-boat-inspection.json",
      "reason": "Establish the source-backed Del Valle foundation from the supplied ReserveAmerica overview.",
      "record_id": "claim-del-valle-boat-inspection",
      "record_type": "claim",
      "summary": "Establish Del Valle park and family-campground knowledge from the ReserveAmerica overview while preserving inventory, permit, and operational-condition uncertainty."
    },
    {
      "action": "REPLACE",
      "change_set_id": "wp-20260920-ebrpd-invasive-mussel-program",
      "evidence_refs": [
        "evidence-del-valle-boat-inspection",
        "evidence-del-valle-ebrpd-boat-inspection",
        "evidence-ebrpd-mussels-del-valle-inspection"
      ],
      "knowledge_gap_refs": [],
      "path": "canonical/v0/claims/claim-del-valle-boat-inspection.json",
      "reason": "Add EBRPD invasive-mussel inspection evidence and equipment-context rules.",
      "record_id": "claim-del-valle-boat-inspection",
      "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."
    },
    {
      "action": "ADD",
      "change_set_id": "wp-20260920-ebrpd-ordinance-38-del-valle",
      "evidence_refs": [],
      "knowledge_gap_refs": [],
      "path": "canonical/v0/claims/claim-del-valle-ordinance-boat-operating-rules.json",
      "reason": "Add September 2023 Ordinance 38 as primary regulatory evidence for Del Valle planning.",
      "record_id": "claim-del-valle-ordinance-boat-operating-rules",
      "record_type": "claim",
      "summary": "Ingest the Ordinance 38 landing page and September 2023 PDF, separating district-wide and Del Valle-specific rules."
    },
    {
      "action": "ADD",
      "change_set_id": "wp-20260920-del-valle-ebrpd-park-page",
      "evidence_refs": [
        "evidence-del-valle-ebrpd-boat-speed"
      ],
      "knowledge_gap_refs": [],
      "path": "canonical/v0/claims/claim-del-valle-ebrpd-boat-speed.json",
      "reason": "Add EBRPD park-page evidence, preserve conflicts, and refine current Del Valle knowledge.",
      "record_id": "claim-del-valle-ebrpd-boat-speed",
      "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-ordinance-38-del-valle",
      "evidence_refs": [],
      "knowledge_gap_refs": [],
      "path": "canonical/v0/claims/claim-del-valle-ebrpd-boat-speed.json",
      "reason": "Add September 2023 Ordinance 38 as primary regulatory evidence for Del Valle planning.",
      "record_id": "claim-del-valle-ebrpd-boat-speed",
      "record_type": "claim",
      "summary": "Ingest the Ordinance 38 landing page and September 2023 PDF, separating district-wide and Del Valle-specific rules."
    },
    {
      "action": "ADD",
      "change_set_id": "wp-20260920-ebrpd-ordinance-38-del-valle",
      "evidence_refs": [],
      "knowledge_gap_refs": [],
      "path": "canonical/v0/claims/claim-ebrpd-boat-swimmer-separation.json",
      "reason": "Add September 2023 Ordinance 38 as primary regulatory evidence for Del Valle planning.",
      "record_id": "claim-ebrpd-boat-swimmer-separation",
      "record_type": "claim",
      "summary": "Ingest the Ordinance 38 landing page and September 2023 PDF, separating district-wide and Del Valle-specific rules."
    },
    {
      "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."
    },
    {
      "action": "ADD",
      "change_set_id": "wp-20260920-ebrpd-del-valle-swimming",
      "evidence_refs": [
        "evidence-ebrpd-swimming-del-valle-monitoring"
      ],
      "knowledge_gap_refs": [],
      "path": "canonical/v0/claims/claim-ebrpd-swimming-del-valle-monitoring.json",
      "reason": "Add district-wide and Del Valle-specific swimming evidence with explicit applicability.",
      "record_id": "claim-ebrpd-swimming-del-valle-monitoring",
      "record_type": "claim",
      "summary": "Add two linked EBRPD swimming sources while keeping district registration rules separate from Del Valle-specific schedules, safety, fees, and current conditions."
    },
    {
      "action": "REPLACE",
      "change_set_id": "wp-20260920-ebrpd-water-quality-stoplight",
      "evidence_refs": [
        "evidence-ebrpd-swimming-del-valle-monitoring",
        "evidence-ebrpd-water-quality-del-valle-monitoring"
      ],
      "knowledge_gap_refs": [],
      "path": "canonical/v0/claims/claim-ebrpd-swimming-del-valle-monitoring.json",
      "reason": "Add EBRPD bacterial water-quality stop-light evidence and narrow the remaining algae interaction gap.",
      "record_id": "claim-ebrpd-swimming-del-valle-monitoring",
      "record_type": "claim",
      "summary": "Define EBRPD bacterial traffic-light meanings without treating green as overriding algae advisories or other closures."
    },
    {
      "action": "ADD",
      "change_set_id": "wp-20260920-ebrpd-ordinance-38-del-valle",
      "evidence_refs": [],
      "knowledge_gap_refs": [],
      "path": "canonical/v0/claims/claim-del-valle-dog-swimming-prohibited-zone.json",
      "reason": "Add September 2023 Ordinance 38 as primary regulatory evidence for Del Valle planning.",
      "record_id": "claim-del-valle-dog-swimming-prohibited-zone",
      "record_type": "claim",
      "summary": "Ingest the Ordinance 38 landing page and September 2023 PDF, separating district-wide and Del Valle-specific rules."
    },
    {
      "action": "ADD",
      "change_set_id": "wp-20260920-ebrpd-blue-green-algae",
      "evidence_refs": [
        "evidence-ebrpd-algae-del-valle-drinking-water"
      ],
      "knowledge_gap_refs": [],
      "path": "canonical/v0/claims/claim-ebrpd-algae-del-valle-drinking-water.json",
      "reason": "Add EBRPD blue-green-algae health guidance and dated Del Valle conditions.",
      "record_id": "claim-ebrpd-algae-del-valle-drinking-water",
      "record_type": "claim",
      "summary": "Add EBRPD harmful-algal-bloom health and monitoring guidance, corroborate dated Del Valle beach conditions, and preserve the unresolved advisory-level action boundary."
    },
    {
      "action": "ADD",
      "change_set_id": "wp-20260920-del-valle-map-picnic-fishing",
      "evidence_refs": [],
      "knowledge_gap_refs": [],
      "path": "canonical/v0/claims/claim-del-valle-fishing-stocking.json",
      "reason": "Add the April 2026 Del Valle map plus official picnic and fishing evidence, preserving applicability gaps.",
      "record_id": "claim-del-valle-fishing-stocking",
      "record_type": "claim",
      "summary": "Ingest the April 2026 park map, picnic inventory, and fishing requirements with explicit conflicts and spatial gaps."
    },
    {
      "action": "ADD",
      "change_set_id": "wp-20260920-del-valle-map-picnic-fishing",
      "evidence_refs": [],
      "knowledge_gap_refs": [],
      "path": "canonical/v0/claims/claim-del-valle-fishing-license-requirements.json",
      "reason": "Add the April 2026 Del Valle map plus official picnic and fishing evidence, preserving applicability gaps.",
      "record_id": "claim-del-valle-fishing-license-requirements",
      "record_type": "claim",
      "summary": "Ingest the April 2026 park map, picnic inventory, and fishing requirements with explicit conflicts and spatial gaps."
    },
    {
      "action": "ADD",
      "change_set_id": "wp-20260920-del-valle-reserveamerica-foundation",
      "evidence_refs": [
        "evidence-del-valle-lake-in-park"
      ],
      "knowledge_gap_refs": [],
      "path": "canonical/v0/claims/claim-del-valle-lake-in-park.json",
      "reason": "Establish the source-backed Del Valle foundation from the supplied ReserveAmerica overview.",
      "record_id": "claim-del-valle-lake-in-park",
      "record_type": "claim",
      "summary": "Establish Del Valle park and family-campground knowledge from the ReserveAmerica overview while preserving inventory, permit, and operational-condition uncertainty."
    },
    {
      "action": "ADD",
      "change_set_id": "wp-20260920-ebrpd-ordinance-38-del-valle",
      "evidence_refs": [],
      "knowledge_gap_refs": [],
      "path": "canonical/v0/claims/claim-del-valle-ordinance-boat-launch.json",
      "reason": "Add September 2023 Ordinance 38 as primary regulatory evidence for Del Valle planning.",
      "record_id": "claim-del-valle-ordinance-boat-launch",
      "record_type": "claim",
      "summary": "Ingest the Ordinance 38 landing page and September 2023 PDF, separating district-wide and Del Valle-specific rules."
    },
    {
      "action": "ADD",
      "change_set_id": "wp-20260920-del-valle-ebrpd-park-page",
      "evidence_refs": [
        "evidence-del-valle-ebrpd-hydrofoil-prohibition"
      ],
      "knowledge_gap_refs": [],
      "path": "canonical/v0/claims/claim-del-valle-ebrpd-hydrofoil-prohibition.json",
      "reason": "Add EBRPD park-page evidence, preserve conflicts, and refine current Del Valle knowledge.",
      "record_id": "claim-del-valle-ebrpd-hydrofoil-prohibition",
      "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": "ADD",
      "change_set_id": "wp-20260920-del-valle-ebrpd-park-page",
      "evidence_refs": [
        "evidence-del-valle-ebrpd-boating-fees"
      ],
      "knowledge_gap_refs": [],
      "path": "canonical/v0/claims/claim-del-valle-ebrpd-boating-fees.json",
      "reason": "Add EBRPD park-page evidence, preserve conflicts, and refine current Del Valle knowledge.",
      "record_id": "claim-del-valle-ebrpd-boating-fees",
      "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-del-valle-ebrpd-park-page",
      "evidence_refs": [
        "evidence-del-valle-lake-length",
        "evidence-del-valle-ebrpd-lake-length"
      ],
      "knowledge_gap_refs": [],
      "path": "canonical/v0/claims/claim-del-valle-lake-length.json",
      "reason": "Add EBRPD park-page evidence, preserve conflicts, and refine current Del Valle knowledge.",
      "record_id": "claim-del-valle-lake-length",
      "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": "ADD",
      "change_set_id": "wp-20260920-del-valle-reserveamerica-foundation",
      "evidence_refs": [
        "evidence-del-valle-lake-length"
      ],
      "knowledge_gap_refs": [],
      "path": "canonical/v0/claims/claim-del-valle-lake-length.json",
      "reason": "Establish the source-backed Del Valle foundation from the supplied ReserveAmerica overview.",
      "record_id": "claim-del-valle-lake-length",
      "record_type": "claim",
      "summary": "Establish Del Valle park and family-campground knowledge from the ReserveAmerica overview while preserving inventory, permit, and operational-condition uncertainty."
    },
    {
      "action": "ADD",
      "change_set_id": "wp-20260920-del-valle-reserveamerica-foundation",
      "evidence_refs": [
        "evidence-del-valle-swimming"
      ],
      "knowledge_gap_refs": [],
      "path": "canonical/v0/claims/claim-del-valle-swimming.json",
      "reason": "Establish the source-backed Del Valle foundation from the supplied ReserveAmerica overview.",
      "record_id": "claim-del-valle-swimming",
      "record_type": "claim",
      "summary": "Establish Del Valle park and family-campground knowledge from the ReserveAmerica overview while preserving inventory, permit, and operational-condition uncertainty."
    },
    {
      "action": "ADD",
      "change_set_id": "wp-20260920-ebrpd-del-valle-swimming",
      "evidence_refs": [
        "evidence-ebrpd-swimming-del-valle-safety"
      ],
      "knowledge_gap_refs": [],
      "path": "canonical/v0/claims/claim-ebrpd-swimming-del-valle-safety.json",
      "reason": "Add district-wide and Del Valle-specific swimming evidence with explicit applicability.",
      "record_id": "claim-ebrpd-swimming-del-valle-safety",
      "record_type": "claim",
      "summary": "Add two linked EBRPD swimming sources while keeping district registration rules separate from Del Valle-specific schedules, safety, fees, and current conditions."
    },
    {
      "action": "ADD",
      "change_set_id": "wp-20260920-ebrpd-del-valle-swimming",
      "evidence_refs": [
        "evidence-ebrpd-swimming-year-round-unlifeguarded"
      ],
      "knowledge_gap_refs": [],
      "path": "canonical/v0/claims/claim-ebrpd-swimming-year-round-unlifeguarded.json",
      "reason": "Add district-wide and Del Valle-specific swimming evidence with explicit applicability.",
      "record_id": "claim-ebrpd-swimming-year-round-unlifeguarded",
      "record_type": "claim",
      "summary": "Add two linked EBRPD swimming sources while keeping district registration rules separate from Del Valle-specific schedules, safety, fees, and current conditions."
    },
    {
      "action": "ADD",
      "change_set_id": "wp-20260920-del-valle-ebrpd-park-page",
      "evidence_refs": [
        "evidence-del-valle-ebrpd-clean-drain-dry"
      ],
      "knowledge_gap_refs": [],
      "path": "canonical/v0/claims/claim-del-valle-ebrpd-clean-drain-dry.json",
      "reason": "Add EBRPD park-page evidence, preserve conflicts, and refine current Del Valle knowledge.",
      "record_id": "claim-del-valle-ebrpd-clean-drain-dry",
      "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-clean-drain-dry",
        "evidence-ebrpd-mussels-clean-drain-dry"
      ],
      "knowledge_gap_refs": [],
      "path": "canonical/v0/claims/claim-del-valle-ebrpd-clean-drain-dry.json",
      "reason": "Add EBRPD invasive-mussel inspection evidence and equipment-context rules.",
      "record_id": "claim-del-valle-ebrpd-clean-drain-dry",
      "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."
    }
  ],
  "journey": [],
  "knowledge_gaps": [
    {
      "gap_id": "gap-del-valle-current-fishing-conditions",
      "question": "What current conditions or closures affect fishing at Del Valle?",
      "reason": "Fishing conditions and stocking information are operationally volatile and should be checked near departure.",
      "related_ids": [
        "claim-del-valle-fishing-stocking",
        "claim-ebrpd-alerts-closures-live"
      ]
    },
    {
      "gap_id": "gap-del-valle-current-algae-status",
      "question": "What blue-green algae advisory applies for the planned trip date and beach?",
      "reason": "The overview points to changing updates and does not state a current beach-specific status.",
      "related_ids": [
        "claim-del-valle-volatile-alerts",
        "claim-del-valle-swimming"
      ]
    }
  ],
  "reference_evidence": [],
  "relationships": [
    {
      "evidence_ids": [
        "evidence-ebrpd-mussels-inspection-scope"
      ],
      "object_id": "lake-del-valle",
      "predicate": "applies_at",
      "relationship_id": "relationship-ebrpd-mussel-program-applies-del-valle",
      "subject_id": "program-ebrpd-invasive-mussel",
      "temporal_scope": null
    },
    {
      "evidence_ids": [
        "evidence-del-valle-lake-in-park"
      ],
      "object_id": "park-del-valle-regional-park",
      "predicate": "located_in",
      "relationship_id": "relationship-lake-del-valle-in-park",
      "subject_id": "lake-del-valle",
      "temporal_scope": null
    }
  ],
  "route_geometry": null,
  "route_geometry_url": null,
  "type": "canonical_entity"
}