Mitchell Bay Interim Corrective Measure Remediation of Docks 6 and 7

History & Location

The ExxonMobil Baytown Refinery is located in Baytown, Texas. The Project Site is within an armored shoreline and shallow near-shore tidal zone located between two active refinery docks along the Houston Ship Channel. Historic operations deposited petroleum-containing sediments, some of which had settled below the water level in Mitchell Bay. This settled portion was subsequently covered by silt from the Houston Ship Channel system through natural sedimentation processes over the years. On the shore side, contaminated sediments had been covered by fill material and armored with Gobi-Mats and riprap. The project site overlays clay and sand deposits.

Significant Project Features

• Installation 500 LF of near-shore Open Cell sheet pile wall 50 feet off the shoreline
• Mechanical dredging of 8,000 CY of petroleum-contaminated sediment from Mitchell Bay. Sediment transferred to staging pad for processing
• Amended material with Portland cement to 10 psi and placed solidified sediment behind sheet pile wall. Installation of a 3,500 CY multi-layer low-permeability cap over processed material
• Collection and treatment of all water and wastewater generated during remediation with 500 gpm water treatment system
• Achieved 19,159 workhours without a lost-time incident. Level D PPE

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