California's Forgotten Past

The Arsenic Cattle-Dipping Era

An independent, area-based investigation. Priority areas first. Each section is a self-contained page.

Independent research & data-organization project. No medical advice; no causation established; geographic and temporal overlap does not establish exposure or causation. No CA dip-site soil has been tested. Source grades A1-D per chapter 73; registry: research/source_registry/sources.csv.

Contents

• Author's note
• Introduction
• The California story, 1769-2026
• The discovery of the arsenic mandate
• The health question: Ewing sarcoma, honestly
• The map: where the question lives
• Ladera Ranch: the priority area
• Schools: the roster, and what the borings actually tested for
• Bell Canyon / Coto de Caza: the documented dip ranch
• 30 · Newport Coast
• 40 · Irvine
• 50 · Upper Newport Bay: Eastbluff · The Bluffs · Big Canyon · Santa Ana Heights
• 60 · The Statewide Tier: Fifteen Communities on the Probability Map
• What we're looking for, where it is, and where to dig
• 70 · The Program History: California 1907 to March 1912
• 71 · What Other Places Did: The Contrast
• 72 · The Arsenic Model: a Mass Balance in Pounds
• 73 · Methods and Sources
• Plates: the complete visual record

Also available as a single PDF: California_Report.pdf