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Our Work

Surface Impoundment Closure

Valero Refinery
Ardmore, OK


SEMS was contracted to handle the closure of several surface impoundments (cells located within the Polishing Lagoon System.

Work performed:

  • Treatment of approximately 6,000 cyds of in-situ sludge to reduce the TPH level to below 10,000 ppm
  • Importing and placement of 60,000 cyds of backfill materials
  • Construction of a 5-acre parking area