🌍 Water Contaminant Risk Assessment: 3D Treatment Train

This is a genuine 3D companion to the 2D "Water Contaminant Risk Assessment" panel simulation, ported directly from its source formulas rather than reskinned: the same source-concentration curve (lead = 2 + level×3.3, arsenic = 5 + level×7.2, PFAS = 8 + level×18.5 ppb/ppt), the same blended plant-removal fractions (lead 8%, arsenic 74%, PFAS 88%), the same per-zone capture-probability matrix across coagulation/flocculation, granular activated carbon, reverse osmosis and ion exchange, and the same EPA regulatory thresholds (lead action level 15 ppb, arsenic MCL 10 ppb, PFOA+PFOS MCL 4.0 ppt) all drive a real three-dimensional pipeline you can orbit freely instead of a flat staged panel. Individually colored contaminant particles — grey lead, orange arsenic, magenta PFAS — travel from an aquifer source through four distinct treatment-zone reactors rendered as real 3D geometry (a rotating coagulation paddle, a granular-media point cloud for GAC, stacked membrane discs for reverse osmosis, and a resin-bead cloud for ion exchange), get captured zone-by-zone according to the ported probability matrix, and whatever reaches the tap is checked live against the MCL thresholds. A population grid beyond the tap tints itself by exposure risk, and toggling the LSL Replacement Program control zeroes the lead service-line spike exactly as remediation would in the real distribution network.