{
  "answerability": "evidence_backed_claims_available",
  "claims": [
    {
      "claim": {
        "claim_id": "claim-ebrpd-swimming-west-beach-in-park",
        "evidence_ids": [
          "evidence-ebrpd-swimming-west-beach-in-park"
        ],
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        "spatial_scope_ids": [
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        ],
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        "temporal_scope": null,
        "value": "park-del-valle-regional-park"
      },
      "evidence": [
        {
          "claim_id": "claim-ebrpd-swimming-west-beach-in-park",
          "evidence_id": "evidence-ebrpd-swimming-west-beach-in-park",
          "notes": "",
          "observation_id": "observation-ebrpd-swimming-del-valle-hours",
          "stance": "supports"
        }
      ],
      "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.",
          "observation_id": "observation-ebrpd-swimming-del-valle-hours",
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          "retrieved_at": "2026-09-20T00:00:00+00:00",
          "source_id": "source-ebrpd-del-valle-swimming"
        }
      ],
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        {
          "locator": "https://www.ebparks.org/recreation/swimming/del-valle",
          "publisher": "East Bay Regional Park District",
          "source_id": "source-ebrpd-del-valle-swimming"
        }
      ],
      "subject": {
        "entity_id": "beach-del-valle-west",
        "kind": "swim_beach",
        "name": "Del Valle West Swim Beach"
      }
    },
    {
      "claim": {
        "claim_id": "claim-del-valle-ebrpd-west-beach-water",
        "evidence_ids": [
          "evidence-del-valle-ebrpd-west-beach-water",
          "evidence-ebrpd-algae-west-beach-no-water",
          "evidence-ebrpd-swimming-west-no-water",
          "evidence-ebrpd-water-quality-west-no-water"
        ],
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        "spatial_scope_ids": [
          "scope-del-valle-west-beach"
        ],
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        "temporal_scope": {
          "ends_on": "2026-09-20",
          "starts_on": "2026-09-20"
        },
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      },
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        {
          "claim_id": "claim-del-valle-ebrpd-west-beach-water",
          "evidence_id": "evidence-del-valle-ebrpd-west-beach-water",
          "notes": "",
          "observation_id": "observation-del-valle-ebrpd-water-quality",
          "stance": "supports"
        },
        {
          "claim_id": "claim-del-valle-ebrpd-west-beach-water",
          "evidence_id": "evidence-ebrpd-algae-west-beach-no-water",
          "notes": "",
          "observation_id": "observation-ebrpd-algae-current-del-valle",
          "stance": "supports"
        },
        {
          "claim_id": "claim-del-valle-ebrpd-west-beach-water",
          "evidence_id": "evidence-ebrpd-swimming-west-no-water",
          "notes": "",
          "observation_id": "observation-ebrpd-swimming-current-beaches",
          "stance": "supports"
        },
        {
          "claim_id": "claim-del-valle-ebrpd-west-beach-water",
          "evidence_id": "evidence-ebrpd-water-quality-west-no-water",
          "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.",
          "observation_id": "observation-del-valle-ebrpd-water-quality",
          "observed_at": "2026-09-20T00:00:00+00:00",
          "observer": "user-supplied page transcription",
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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.",
          "observation_id": "observation-ebrpd-algae-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-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",
          "observed_at": "2026-09-20T00:00:00+00:00",
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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",
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          "source_id": "source-ebrpd-del-valle-swimming"
        },
        {
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          "publisher": "East Bay Regional Park District",
          "source_id": "source-ebrpd-current-water-quality"
        }
      ],
      "subject": {
        "entity_id": "beach-del-valle-west",
        "kind": "swim_beach",
        "name": "Del Valle West Swim Beach"
      }
    }
  ],
  "entity": {
    "entity_id": "beach-del-valle-west",
    "kind": "swim_beach",
    "name": "Del Valle West Swim Beach"
  },
  "gap_details": [],
  "history": [
    {
      "action": "ADD",
      "change_set_id": "wp-20260920-del-valle-ebrpd-park-page",
      "evidence_refs": [],
      "knowledge_gap_refs": [],
      "path": "canonical/v0/entities/beach-del-valle-west.json",
      "reason": "Add EBRPD park-page evidence, preserve conflicts, and refine current Del Valle knowledge.",
      "record_id": "beach-del-valle-west",
      "record_type": "entity",
      "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-ebrpd-del-valle-swimming",
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        "evidence-ebrpd-swimming-west-beach-in-park"
      ],
      "knowledge_gap_refs": [],
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      "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-west-beach-water"
      ],
      "knowledge_gap_refs": [],
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      "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-blue-green-algae",
      "evidence_refs": [
        "evidence-del-valle-ebrpd-west-beach-water",
        "evidence-ebrpd-algae-west-beach-no-water"
      ],
      "knowledge_gap_refs": [],
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      "record_id": "claim-del-valle-ebrpd-west-beach-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": "REPLACE",
      "change_set_id": "wp-20260920-ebrpd-del-valle-swimming",
      "evidence_refs": [
        "evidence-del-valle-ebrpd-west-beach-water",
        "evidence-ebrpd-algae-west-beach-no-water",
        "evidence-ebrpd-swimming-west-no-water"
      ],
      "knowledge_gap_refs": [],
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    },
    {
      "action": "REPLACE",
      "change_set_id": "wp-20260920-ebrpd-water-quality-stoplight",
      "evidence_refs": [
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        "evidence-ebrpd-water-quality-west-no-water"
      ],
      "knowledge_gap_refs": [],
      "path": "canonical/v0/claims/claim-del-valle-ebrpd-west-beach-water.json",
      "reason": "Add EBRPD bacterial water-quality stop-light evidence and narrow the remaining algae interaction gap.",
      "record_id": "claim-del-valle-ebrpd-west-beach-water",
      "record_type": "claim",
      "summary": "Define EBRPD bacterial traffic-light meanings without treating green as overriding algae advisories or other closures."
    }
  ],
  "journey": [],
  "knowledge_gaps": [],
  "reference_evidence": [],
  "relationships": [
    {
      "evidence_ids": [
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      ],
      "object_id": "park-del-valle-regional-park",
      "predicate": "located_in",
      "relationship_id": "relationship-del-valle-west-beach-in-park",
      "subject_id": "beach-del-valle-west",
      "temporal_scope": null
    }
  ],
  "route_geometry": null,
  "route_geometry_url": null,
  "type": "canonical_entity"
}