{
  "answerability": "evidence_backed_claims_available",
  "claims": [
    {
      "claim": {
        "claim_id": "claim-quarry-rainbow-lake-water-quality-20260922",
        "evidence_ids": [
          "evidence-quarry-rainbow-lake-water-quality-20260922"
        ],
        "predicate": "water_quality_status",
        "spatial_scope_ids": [
          "scope-waterbody-quarry-rainbow-lake"
        ],
        "subject_id": "waterbody-quarry-rainbow-lake",
        "temporal_scope": {
          "ends_on": null,
          "starts_on": null
        },
        "value": {
          "hazard": "blue-green algae",
          "status": "caution_advisory",
          "water_contact_rule": "swimming never allowed"
        }
      },
      "evidence": [
        {
          "claim_id": "claim-quarry-rainbow-lake-water-quality-20260922",
          "evidence_id": "evidence-quarry-rainbow-lake-water-quality-20260922",
          "notes": "Official park guidance; current conditions require a pre-trip recheck.",
          "observation_id": "observation-ebrpd-quarry-lakes-water-rules-20260922",
          "stance": "supports"
        }
      ],
      "observations": [
        {
          "artifact_refs": [
            "Current notices",
            "To Reach The Park",
            "Park Accessibility",
            "Attractions"
          ],
          "content": "The live official park page publishes the water-body conditions, water-contact rules, recreation requirements, accessibility, access points, and closures represented by the associated claims.",
          "observation_id": "observation-ebrpd-quarry-lakes-water-rules-20260922",
          "observed_at": null,
          "observer": "Wayproof live source review",
          "retrieved_at": "2026-09-22T20:00:00+00:00",
          "source_id": "source-ebrpd-quarry-lakes-park-page"
        }
      ],
      "sources": [
        {
          "locator": "https://www.ebparks.org/parks/quarry-lakes",
          "publisher": "East Bay Regional Park District",
          "source_id": "source-ebrpd-quarry-lakes-park-page"
        }
      ],
      "subject": {
        "entity_id": "waterbody-quarry-rainbow-lake",
        "kind": "waterbody",
        "name": "Rainbow Lake"
      }
    }
  ],
  "entity": {
    "entity_id": "waterbody-quarry-rainbow-lake",
    "kind": "waterbody",
    "name": "Rainbow Lake"
  },
  "gap_details": [],
  "history": [
    {
      "action": "ADD",
      "change_set_id": "wp-20260922-contra-loma-quarry-water-rules",
      "evidence_refs": [],
      "knowledge_gap_refs": [],
      "path": "canonical/v0/entities/waterbody-quarry-rainbow-lake.json",
      "reason": "Deepen official water, recreation, access, facility, or route knowledge.",
      "record_id": "waterbody-quarry-rainbow-lake",
      "record_type": "entity",
      "summary": "Deepen Contra Loma and Quarry Lakes water-recreation planning knowledge."
    },
    {
      "action": "ADD",
      "change_set_id": "wp-20260922-contra-loma-quarry-water-rules",
      "evidence_refs": [],
      "knowledge_gap_refs": [],
      "path": "canonical/v0/claims/claim-quarry-rainbow-lake-water-quality-20260922.json",
      "reason": "Deepen official water, recreation, access, facility, or route knowledge.",
      "record_id": "claim-quarry-rainbow-lake-water-quality-20260922",
      "record_type": "claim",
      "summary": "Deepen Contra Loma and Quarry Lakes water-recreation planning knowledge."
    }
  ],
  "journey": [],
  "knowledge_gaps": [],
  "reference_evidence": [],
  "relationships": [
    {
      "evidence_ids": [
        "evidence-quarry-rainbow-lake-water-quality-20260922"
      ],
      "object_id": "park-quarry-lakes-regional-recreation-area",
      "predicate": "located_in",
      "relationship_id": "relationship-quarry-rainbow-lake-in-quarry-lakes",
      "subject_id": "waterbody-quarry-rainbow-lake",
      "temporal_scope": null
    }
  ],
  "route_geometry": null,
  "route_geometry_url": null,
  "type": "canonical_entity"
}