{
  "claims": [
    {
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        "evidence_ids": [
          "evidence-big-break-shoreline-water-quality-20260922"
        ],
        "predicate": "water_quality_status",
        "spatial_scope_ids": [
          "scope-waterbody-big-break-shoreline"
        ],
        "subject_id": "waterbody-big-break-shoreline",
        "temporal_scope": {
          "ends_on": null,
          "starts_on": null
        },
        "value": {
          "as_of_retrieval": "2026-09-22",
          "hazard": "blue-green algae",
          "status": "danger_advisory",
          "volatile": true
        }
      },
      "evidence": [
        {
          "claim_id": "claim-big-break-shoreline-water-quality-20260922",
          "evidence_id": "evidence-big-break-shoreline-water-quality-20260922",
          "notes": "Volatile official status; recheck before water contact or travel.",
          "observation_id": "observation-ebrpd-current-water-quality-20260922",
          "stance": "supports"
        }
      ],
      "observations": [
        {
          "artifact_refs": [
            "Water Quality Notices table"
          ],
          "content": "The live Current Water Quality Conditions table reported the location-specific advisory states represented by the associated claims.",
          "observation_id": "observation-ebrpd-current-water-quality-20260922",
          "observed_at": null,
          "observer": "Wayproof live source review",
          "retrieved_at": "2026-09-22T21:00:00+00:00",
          "source_id": "source-ebrpd-current-water-quality"
        }
      ],
      "sources": [
        {
          "locator": "https://www.ebparks.org/natural-resources/water-quality",
          "publisher": "East Bay Regional Park District",
          "source_id": "source-ebrpd-current-water-quality"
        }
      ]
    },
    {
      "claim": {
        "claim_id": "claim-contra-loma-reservoir-water-quality-20260922",
        "evidence_ids": [
          "evidence-contra-loma-reservoir-water-quality-20260922"
        ],
        "predicate": "water_quality_status",
        "spatial_scope_ids": [
          "scope-contra-loma-reservoir"
        ],
        "subject_id": "reservoir-contra-loma",
        "temporal_scope": {
          "ends_on": null,
          "starts_on": null
        },
        "value": {
          "as_of_retrieval": "2026-09-22",
          "hazard": "blue-green algae",
          "status": "no_advisory_posted",
          "volatile": true
        }
      },
      "evidence": [
        {
          "claim_id": "claim-contra-loma-reservoir-water-quality-20260922",
          "evidence_id": "evidence-contra-loma-reservoir-water-quality-20260922",
          "notes": "Volatile official status; recheck before water contact or travel.",
          "observation_id": "observation-ebrpd-current-water-quality-20260922",
          "stance": "supports"
        }
      ],
      "observations": [
        {
          "artifact_refs": [
            "Water Quality Notices table"
          ],
          "content": "The live Current Water Quality Conditions table reported the location-specific advisory states represented by the associated claims.",
          "observation_id": "observation-ebrpd-current-water-quality-20260922",
          "observed_at": null,
          "observer": "Wayproof live source review",
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          "source_id": "source-ebrpd-current-water-quality"
        }
      ],
      "sources": [
        {
          "locator": "https://www.ebparks.org/natural-resources/water-quality",
          "publisher": "East Bay Regional Park District",
          "source_id": "source-ebrpd-current-water-quality"
        }
      ]
    },
    {
      "claim": {
        "claim_id": "claim-crown-water-quality-20260922",
        "evidence_ids": [
          "evidence-crown-water-quality-20260922"
        ],
        "predicate": "water_quality_status",
        "spatial_scope_ids": [
          "scope-beach-crown"
        ],
        "subject_id": "beach-crown",
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          "ends_on": null,
          "starts_on": null
        },
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          "as_of_retrieval": "2026-09-22",
          "status": "no_advisory_posted",
          "volatile": true
        }
      },
      "evidence": [
        {
          "claim_id": "claim-crown-water-quality-20260922",
          "evidence_id": "evidence-crown-water-quality-20260922",
          "notes": "Volatile official status; recheck before water contact or travel.",
          "observation_id": "observation-ebrpd-current-water-quality-20260922",
          "stance": "supports"
        }
      ],
      "observations": [
        {
          "artifact_refs": [
            "Water Quality Notices table"
          ],
          "content": "The live Current Water Quality Conditions table reported the location-specific advisory states represented by the associated claims.",
          "observation_id": "observation-ebrpd-current-water-quality-20260922",
          "observed_at": null,
          "observer": "Wayproof live source review",
          "retrieved_at": "2026-09-22T21:00:00+00:00",
          "source_id": "source-ebrpd-current-water-quality"
        }
      ],
      "sources": [
        {
          "locator": "https://www.ebparks.org/natural-resources/water-quality",
          "publisher": "East Bay Regional Park District",
          "source_id": "source-ebrpd-current-water-quality"
        }
      ]
    },
    {
      "claim": {
        "claim_id": "claim-del-valle-ebrpd-east-beach-algae",
        "evidence_ids": [
          "evidence-del-valle-ebrpd-east-beach-algae",
          "evidence-ebrpd-algae-east-beach-caution",
          "evidence-ebrpd-swimming-east-caution",
          "evidence-ebrpd-water-quality-east-caution"
        ],
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        "spatial_scope_ids": [
          "scope-del-valle-east-beach"
        ],
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          "ends_on": "2026-09-20",
          "starts_on": "2026-09-20"
        },
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      },
      "evidence": [
        {
          "claim_id": "claim-del-valle-ebrpd-east-beach-algae",
          "evidence_id": "evidence-del-valle-ebrpd-east-beach-algae",
          "notes": "",
          "observation_id": "observation-del-valle-ebrpd-water-quality",
          "stance": "supports"
        },
        {
          "claim_id": "claim-del-valle-ebrpd-east-beach-algae",
          "evidence_id": "evidence-ebrpd-algae-east-beach-caution",
          "notes": "",
          "observation_id": "observation-ebrpd-algae-current-del-valle",
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        },
        {
          "claim_id": "claim-del-valle-ebrpd-east-beach-algae",
          "evidence_id": "evidence-ebrpd-swimming-east-caution",
          "notes": "",
          "observation_id": "observation-ebrpd-swimming-current-beaches",
          "stance": "supports"
        },
        {
          "claim_id": "claim-del-valle-ebrpd-east-beach-algae",
          "evidence_id": "evidence-ebrpd-water-quality-east-caution",
          "notes": "",
          "observation_id": "observation-ebrpd-water-quality-current-del-valle",
          "stance": "supports"
        }
      ],
      "observations": [
        {
          "artifact_refs": [],
          "content": "At retrieval, the EBRPD page posted a blue-green algae Caution Advisory for the East Swim Beach and stated that the West Swim Beach had no water because of low lake levels.",
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          "source_id": "source-ebrpd-del-valle-park-page"
        },
        {
          "artifact_refs": [],
          "content": "At retrieval, the current-conditions table listed a Caution Advisory for the Del Valle East Swim Beach and no advisory for the West Swim Beach, where it reported no water because of low lake levels.",
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          "source_id": "source-ebrpd-blue-green-algae"
        },
        {
          "artifact_refs": [],
          "content": "At retrieval, East Beach had a blue-green algae Caution Advisory and West Beach had no water because of low lake levels.",
          "observation_id": "observation-ebrpd-swimming-current-beaches",
          "observed_at": "2026-09-20T00:00:00+00:00",
          "observer": "user-supplied page transcription",
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          "source_id": "source-ebrpd-del-valle-swimming"
        },
        {
          "artifact_refs": [],
          "content": "At retrieval, the table listed a Caution algae advisory at Del Valle East Beach and no advisory at West Beach, where there was no water because of low lake levels.",
          "observation_id": "observation-ebrpd-water-quality-current-del-valle",
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          "observer": "user-supplied page transcription",
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          "source_id": "source-ebrpd-current-water-quality"
        }
      ],
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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"
        },
        {
          "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"
        },
        {
          "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"
        }
      ]
    },
    {
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          "evidence-del-valle-ebrpd-west-beach-water",
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          "evidence-ebrpd-swimming-west-no-water",
          "evidence-ebrpd-water-quality-west-no-water"
        ],
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          "starts_on": "2026-09-20"
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        {
          "claim_id": "claim-del-valle-ebrpd-west-beach-water",
          "evidence_id": "evidence-del-valle-ebrpd-west-beach-water",
          "notes": "",
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        },
        {
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        },
        {
          "claim_id": "claim-del-valle-ebrpd-west-beach-water",
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        },
        {
          "claim_id": "claim-del-valle-ebrpd-west-beach-water",
          "evidence_id": "evidence-ebrpd-water-quality-west-no-water",
          "notes": "",
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        }
      ],
      "observations": [
        {
          "artifact_refs": [],
          "content": "At retrieval, the EBRPD page posted a blue-green algae Caution Advisory for the East Swim Beach and stated that the West Swim Beach had no water because of low lake levels.",
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          "source_id": "source-ebrpd-del-valle-park-page"
        },
        {
          "artifact_refs": [],
          "content": "At retrieval, the current-conditions table listed a Caution Advisory for the Del Valle East Swim Beach and no advisory for the West Swim Beach, where it reported no water because of low lake levels.",
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          "source_id": "source-ebrpd-blue-green-algae"
        },
        {
          "artifact_refs": [],
          "content": "At retrieval, East Beach had a blue-green algae Caution Advisory and West Beach had no water because of low lake levels.",
          "observation_id": "observation-ebrpd-swimming-current-beaches",
          "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-swimming"
        },
        {
          "artifact_refs": [],
          "content": "At retrieval, the table listed a Caution algae advisory at Del Valle East Beach and no advisory at West Beach, where there was no water because of low lake levels.",
          "observation_id": "observation-ebrpd-water-quality-current-del-valle",
          "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-current-water-quality"
        }
      ],
      "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/natural-resources/water-quality/blue-green-algae",
          "publisher": "East Bay Regional Park District",
          "source_id": "source-ebrpd-blue-green-algae"
        },
        {
          "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"
        }
      ]
    },
    {
      "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",
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        },
        {
          "claim_id": "claim-ebrpd-swimming-del-valle-monitoring",
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          "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,
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        }
      ],
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        {
          "locator": "https://www.ebparks.org/recreation/swimming/del-valle",
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        },
        {
          "locator": "https://www.ebparks.org/natural-resources/water-quality",
          "publisher": "East Bay Regional Park District",
          "source_id": "source-ebrpd-current-water-quality"
        }
      ]
    },
    {
      "claim": {
        "claim_id": "claim-ebrpd-water-quality-program-scope",
        "evidence_ids": [
          "evidence-ebrpd-water-quality-program-scope"
        ],
        "predicate": "water_quality_program_scope",
        "spatial_scope_ids": [
          "scope-ebrpd-water-quality-program"
        ],
        "subject_id": "program-ebrpd-hab-monitoring",
        "temporal_scope": null,
        "value": [
          "recreational_water",
          "drinking_water",
          "storm_water",
          "wastewater",
          "lakes",
          "creeks",
          "water_related_emergencies"
        ]
      },
      "evidence": [
        {
          "claim_id": "claim-ebrpd-water-quality-program-scope",
          "evidence_id": "evidence-ebrpd-water-quality-program-scope",
          "notes": "",
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        }
      ],
      "observations": [
        {
          "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,
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          "retrieved_at": "2026-09-20T00:00:00+00:00",
          "source_id": "source-ebrpd-current-water-quality"
        }
      ],
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        {
          "locator": "https://www.ebparks.org/natural-resources/water-quality",
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        }
      ]
    },
    {
      "claim": {
        "claim_id": "claim-ebrpd-water-quality-traffic-light",
        "evidence_ids": [
          "evidence-ebrpd-water-quality-traffic-light"
        ],
        "predicate": "bacterial_stoplight_meanings",
        "spatial_scope_ids": [
          "scope-ebrpd-water-quality-program"
        ],
        "subject_id": "program-ebrpd-hab-monitoring",
        "temporal_scope": null,
        "value": {
          "green": "indicator_results_below_maximums_meet_state_standards",
          "indicators": [
            "total_coliform",
            "fecal_coliform",
            "Enterococcus",
            "E_coli"
          ],
          "red": "beach_closed_for_water_quality_issue",
          "yellow": "one_or_more_indicators_exceed_daily_maximum"
        }
      },
      "evidence": [
        {
          "claim_id": "claim-ebrpd-water-quality-traffic-light",
          "evidence_id": "evidence-ebrpd-water-quality-traffic-light",
          "notes": "",
          "observation_id": "observation-ebrpd-water-quality-traffic-light",
          "stance": "supports"
        }
      ],
      "observations": [
        {
          "artifact_refs": [],
          "content": "California swim-water evaluation uses total coliform, fecal coliform, Enterococcus, and E. coli indicators. Green means results are below maximums and meet state standards; yellow means one or more indicators exceeds a daily maximum; red means the beach is closed for a water-quality issue and visitors must not enter.",
          "observation_id": "observation-ebrpd-water-quality-traffic-light",
          "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/natural-resources/water-quality",
          "publisher": "East Bay Regional Park District",
          "source_id": "source-ebrpd-current-water-quality"
        }
      ]
    },
    {
      "claim": {
        "claim_id": "claim-keller-water-quality-20260922",
        "evidence_ids": [
          "evidence-keller-water-quality-20260922"
        ],
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        "spatial_scope_ids": [
          "scope-beach-keller"
        ],
        "subject_id": "beach-keller",
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          "ends_on": null,
          "starts_on": null
        },
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          "status": "water_advisory",
          "volatile": true
        }
      },
      "evidence": [
        {
          "claim_id": "claim-keller-water-quality-20260922",
          "evidence_id": "evidence-keller-water-quality-20260922",
          "notes": "Volatile official status; recheck before water contact or travel.",
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          "stance": "supports"
        }
      ],
      "observations": [
        {
          "artifact_refs": [
            "Water Quality Notices table"
          ],
          "content": "The live Current Water Quality Conditions table reported the location-specific advisory states represented by the associated claims.",
          "observation_id": "observation-ebrpd-current-water-quality-20260922",
          "observed_at": null,
          "observer": "Wayproof live source review",
          "retrieved_at": "2026-09-22T21:00:00+00:00",
          "source_id": "source-ebrpd-current-water-quality"
        }
      ],
      "sources": [
        {
          "locator": "https://www.ebparks.org/natural-resources/water-quality",
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          "source_id": "source-ebrpd-current-water-quality"
        }
      ]
    },
    {
      "claim": {
        "claim_id": "claim-lake-chabot-water-quality-20260922",
        "evidence_ids": [
          "evidence-lake-chabot-water-quality-20260922"
        ],
        "predicate": "water_quality_status",
        "spatial_scope_ids": [
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        ],
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        "temporal_scope": {
          "ends_on": null,
          "starts_on": null
        },
        "value": {
          "as_of_retrieval": "2026-09-22",
          "hazard": "blue-green algae",
          "status": "caution_advisory",
          "volatile": true,
          "water_contact_rule": "swimming never permitted"
        }
      },
      "evidence": [
        {
          "claim_id": "claim-lake-chabot-water-quality-20260922",
          "evidence_id": "evidence-lake-chabot-water-quality-20260922",
          "notes": "Volatile official status; recheck before water contact or travel.",
          "observation_id": "observation-ebrpd-current-water-quality-20260922",
          "stance": "supports"
        }
      ],
      "observations": [
        {
          "artifact_refs": [
            "Water Quality Notices table"
          ],
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          "observation_id": "observation-ebrpd-current-water-quality-20260922",
          "observed_at": null,
          "observer": "Wayproof live source review",
          "retrieved_at": "2026-09-22T21:00:00+00:00",
          "source_id": "source-ebrpd-current-water-quality"
        }
      ],
      "sources": [
        {
          "locator": "https://www.ebparks.org/natural-resources/water-quality",
          "publisher": "East Bay Regional Park District",
          "source_id": "source-ebrpd-current-water-quality"
        }
      ]
    },
    {
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          "evidence-lake-temescal-water-quality-20260922"
        ],
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        ],
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          "starts_on": null
        },
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          "volatile": true
        }
      },
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        {
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          "notes": "Volatile official status; recheck before water contact or travel.",
          "observation_id": "observation-ebrpd-current-water-quality-20260922",
          "stance": "supports"
        }
      ],
      "observations": [
        {
          "artifact_refs": [
            "Water Quality Notices table"
          ],
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          "observation_id": "observation-ebrpd-current-water-quality-20260922",
          "observed_at": null,
          "observer": "Wayproof live source review",
          "retrieved_at": "2026-09-22T21:00:00+00:00",
          "source_id": "source-ebrpd-current-water-quality"
        }
      ],
      "sources": [
        {
          "locator": "https://www.ebparks.org/natural-resources/water-quality",
          "publisher": "East Bay Regional Park District",
          "source_id": "source-ebrpd-current-water-quality"
        }
      ]
    },
    {
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        "evidence_ids": [
          "evidence-martinez-shoreline-water-quality-20260922"
        ],
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        "spatial_scope_ids": [
          "scope-waterbody-martinez-shoreline"
        ],
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          "starts_on": null
        },
        "value": {
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          "status": "danger_advisory",
          "volatile": true
        }
      },
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        {
          "claim_id": "claim-martinez-shoreline-water-quality-20260922",
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          "observation_id": "observation-ebrpd-current-water-quality-20260922",
          "stance": "supports"
        }
      ],
      "observations": [
        {
          "artifact_refs": [
            "Water Quality Notices table"
          ],
          "content": "The live Current Water Quality Conditions table reported the location-specific advisory states represented by the associated claims.",
          "observation_id": "observation-ebrpd-current-water-quality-20260922",
          "observed_at": null,
          "observer": "Wayproof live source review",
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          "source_id": "source-ebrpd-current-water-quality"
        }
      ],
      "sources": [
        {
          "locator": "https://www.ebparks.org/natural-resources/water-quality",
          "publisher": "East Bay Regional Park District",
          "source_id": "source-ebrpd-current-water-quality"
        }
      ]
    },
    {
      "claim": {
        "claim_id": "claim-shadow-cliffs-arroyo-water-quality-20260922",
        "evidence_ids": [
          "evidence-shadow-cliffs-arroyo-water-quality-20260922"
        ],
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        "spatial_scope_ids": [
          "scope-waterbody-shadow-cliffs-arroyo"
        ],
        "subject_id": "waterbody-shadow-cliffs-arroyo",
        "temporal_scope": {
          "ends_on": null,
          "starts_on": null
        },
        "value": {
          "as_of_retrieval": "2026-09-22",
          "hazard": "blue-green algae",
          "status": "no_advisory_posted",
          "volatile": true
        }
      },
      "evidence": [
        {
          "claim_id": "claim-shadow-cliffs-arroyo-water-quality-20260922",
          "evidence_id": "evidence-shadow-cliffs-arroyo-water-quality-20260922",
          "notes": "Volatile official status; recheck before water contact or travel.",
          "observation_id": "observation-ebrpd-current-water-quality-20260922",
          "stance": "supports"
        }
      ],
      "observations": [
        {
          "artifact_refs": [
            "Water Quality Notices table"
          ],
          "content": "The live Current Water Quality Conditions table reported the location-specific advisory states represented by the associated claims.",
          "observation_id": "observation-ebrpd-current-water-quality-20260922",
          "observed_at": null,
          "observer": "Wayproof live source review",
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          "source_id": "source-ebrpd-current-water-quality"
        }
      ],
      "sources": [
        {
          "locator": "https://www.ebparks.org/natural-resources/water-quality",
          "publisher": "East Bay Regional Park District",
          "source_id": "source-ebrpd-current-water-quality"
        }
      ]
    },
    {
      "claim": {
        "claim_id": "claim-shadow-cliffs-lake-water-quality-20260922",
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          "evidence-shadow-cliffs-lake-water-quality-20260922"
        ],
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        "spatial_scope_ids": [
          "scope-waterbody-shadow-cliffs-lake"
        ],
        "subject_id": "waterbody-shadow-cliffs-lake",
        "temporal_scope": {
          "ends_on": null,
          "starts_on": null
        },
        "value": {
          "as_of_retrieval": "2026-09-22",
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          "status": "caution_advisory",
          "volatile": true
        }
      },
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        {
          "claim_id": "claim-shadow-cliffs-lake-water-quality-20260922",
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          "notes": "Volatile official status; recheck before water contact or travel.",
          "observation_id": "observation-ebrpd-current-water-quality-20260922",
          "stance": "supports"
        }
      ],
      "observations": [
        {
          "artifact_refs": [
            "Water Quality Notices table"
          ],
          "content": "The live Current Water Quality Conditions table reported the location-specific advisory states represented by the associated claims.",
          "observation_id": "observation-ebrpd-current-water-quality-20260922",
          "observed_at": null,
          "observer": "Wayproof live source review",
          "retrieved_at": "2026-09-22T21:00:00+00:00",
          "source_id": "source-ebrpd-current-water-quality"
        }
      ],
      "sources": [
        {
          "locator": "https://www.ebparks.org/natural-resources/water-quality",
          "publisher": "East Bay Regional Park District",
          "source_id": "source-ebrpd-current-water-quality"
        }
      ]
    },
    {
      "claim": {
        "claim_id": "claim-tilden-lake-anza-water-quality-20260922",
        "evidence_ids": [
          "evidence-tilden-lake-anza-water-quality-20260922"
        ],
        "predicate": "water_quality_status",
        "spatial_scope_ids": [
          "scope-waterbody-tilden-lake-anza"
        ],
        "subject_id": "waterbody-tilden-lake-anza",
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          "starts_on": null
        },
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          "as_of_retrieval": "2026-09-22",
          "hazard": "blue-green algae",
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          "volatile": true
        }
      },
      "evidence": [
        {
          "claim_id": "claim-tilden-lake-anza-water-quality-20260922",
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          "notes": "Volatile official status; recheck before water contact or travel.",
          "observation_id": "observation-ebrpd-current-water-quality-20260922",
          "stance": "supports"
        }
      ],
      "observations": [
        {
          "artifact_refs": [
            "Water Quality Notices table"
          ],
          "content": "The live Current Water Quality Conditions table reported the location-specific advisory states represented by the associated claims.",
          "observation_id": "observation-ebrpd-current-water-quality-20260922",
          "observed_at": null,
          "observer": "Wayproof live source review",
          "retrieved_at": "2026-09-22T21:00:00+00:00",
          "source_id": "source-ebrpd-current-water-quality"
        }
      ],
      "sources": [
        {
          "locator": "https://www.ebparks.org/natural-resources/water-quality",
          "publisher": "East Bay Regional Park District",
          "source_id": "source-ebrpd-current-water-quality"
        }
      ]
    }
  ],
  "entities": [
    {
      "entity_id": "beach-crown",
      "kind": "swim_beach",
      "name": "Crown Beach"
    },
    {
      "entity_id": "beach-del-valle-east",
      "kind": "swim_beach",
      "name": "Del Valle East Swim Beach"
    },
    {
      "entity_id": "beach-del-valle-west",
      "kind": "swim_beach",
      "name": "Del Valle West Swim Beach"
    },
    {
      "entity_id": "beach-keller",
      "kind": "swim_beach",
      "name": "Keller Beach"
    },
    {
      "entity_id": "program-ebrpd-hab-monitoring",
      "kind": "monitoring_program",
      "name": "EBRPD Harmful Algal Bloom Monitoring Program"
    },
    {
      "entity_id": "reservoir-contra-loma",
      "kind": "reservoir",
      "name": "Contra Loma Reservoir"
    },
    {
      "entity_id": "reservoir-lake-chabot",
      "kind": "reservoir",
      "name": "Lake Chabot"
    },
    {
      "entity_id": "waterbody-big-break-shoreline",
      "kind": "waterbody",
      "name": "Big Break Regional Shoreline Water"
    },
    {
      "entity_id": "waterbody-lake-temescal",
      "kind": "waterbody",
      "name": "Lake Temescal"
    },
    {
      "entity_id": "waterbody-martinez-shoreline",
      "kind": "waterbody",
      "name": "Martinez Shoreline"
    },
    {
      "entity_id": "waterbody-shadow-cliffs-arroyo",
      "kind": "waterbody",
      "name": "Shadow Cliffs Arroyo"
    },
    {
      "entity_id": "waterbody-shadow-cliffs-lake",
      "kind": "waterbody",
      "name": "Shadow Cliffs Lake"
    },
    {
      "entity_id": "waterbody-tilden-lake-anza",
      "kind": "waterbody",
      "name": "Lake Anza"
    }
  ],
  "history": [
    {
      "action": "ADD",
      "change_set_id": "wp-20260920-ebrpd-water-quality-stoplight",
      "evidence_refs": [],
      "knowledge_gap_refs": [],
      "path": "canonical/v0/sources/source-ebrpd-current-water-quality.json",
      "reason": "Add EBRPD bacterial water-quality stop-light evidence and narrow the remaining algae interaction gap.",
      "record_id": "source-ebrpd-current-water-quality",
      "record_type": "source",
      "summary": "Define EBRPD bacterial traffic-light meanings without treating green as overriding algae advisories or other closures."
    }
  ],
  "navigation": {
    "next_id": "source-ebrpd-deer-valley-park-page",
    "position": 28,
    "previous_id": "source-ebrpd-cull-canyon-park-page",
    "total": 587
  },
  "observations": [
    {
      "artifact_refs": [
        "Water Quality Notices table"
      ],
      "content": "The live Current Water Quality Conditions table reported the location-specific advisory states represented by the associated claims.",
      "observation_id": "observation-ebrpd-current-water-quality-20260922",
      "observed_at": null,
      "observer": "Wayproof live source review",
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      "source_id": "source-ebrpd-current-water-quality"
    },
    {
      "artifact_refs": [],
      "content": "At retrieval, the table listed a Caution algae advisory at Del Valle East Beach and no advisory at West Beach, where there was no water because of low lake levels.",
      "observation_id": "observation-ebrpd-water-quality-current-del-valle",
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      "observer": "user-supplied page transcription",
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      "source_id": "source-ebrpd-current-water-quality"
    },
    {
      "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",
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      "source_id": "source-ebrpd-current-water-quality"
    },
    {
      "artifact_refs": [],
      "content": "California swim-water evaluation uses total coliform, fecal coliform, Enterococcus, and E. coli indicators. Green means results are below maximums and meet state standards; yellow means one or more indicators exceeds a daily maximum; red means the beach is closed for a water-quality issue and visitors must not enter.",
      "observation_id": "observation-ebrpd-water-quality-traffic-light",
      "observed_at": null,
      "observer": "user-supplied page transcription",
      "retrieved_at": "2026-09-20T00:00:00+00:00",
      "source_id": "source-ebrpd-current-water-quality"
    }
  ],
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    "locator": "https://www.ebparks.org/natural-resources/water-quality",
    "publisher": "East Bay Regional Park District",
    "source_id": "source-ebrpd-current-water-quality"
  },
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  "related_records": [],
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    {
      "locator": "https://www.ebparks.org/natural-resources/water-quality",
      "publisher": "East Bay Regional Park District",
      "source_id": "source-ebrpd-current-water-quality"
    }
  ]
}