Surface emissions

Exceedance locations against available perf, liquid mounds, and well vacuum. Repeat events on the Cell 3 mound are the collection-gap signature.

Available perf (ft)

0.0 — 22.5

Liquid isopach (elev. ft)

0.0 — 0.0

Root cause

Event count

SEM-2026-010
1,120 ppm
Cell 3 interior resample
Jul 22, 2026 · Repeat — persistent liquid mound
SEM-2026-009
505 ppm
Cell 2, 30 ft W of EW-08
Jul 22, 2026 · Failed pump EW-08 influence
SEM-2026-007
390 ppm
Cell 4 SE corner, EW-36
Jul 9, 2026 · Orphan well EW-36 under-pulled
SEM-2026-006
610 ppm
Cell 4 west, 25 ft from EW-31
Jun 18, 2026 · Hot well EW-31 — possible oxidation
SEM-2026-005
860 ppm
Cell 3 / Cell 1 berm, HW-03 alignment
Jun 3, 2026 · Cover penetration near HW-03
SEM-2026-004
410 ppm
Cell 3 north interior
May 12, 2026 · Collection gap — liquid mound
SEM-2026-003
540 ppm
Cell 3 mid-cell, EW-24 radius
May 12, 2026 · Low available perf EW-24
SEM-2026-002
980 ppm
Cell 3 south slope, 40 ft S of EW-23
Apr 8, 2026 · No dewatering on EW-23
SEM-2026-001
720 ppm
Cell 3 interior, between EW-22 and EW-23
Apr 8, 2026 · Saturated well screen — EW-22/23/24
SEM-2026-011
330 ppm
West berm, Cell 3
Mar 17, 2026 · Perimeter penetration
SEM-2026-012
260 ppm
Central haul road
Feb 11, 2026 · Road crossing boot
SEM-2026-008
280 ppm
Cell 1 east road
Nov 19, 2025 · Temporary cover crack