Offshore Dredge Sediment Sampling

Project: Calcasieu River Bar Channel Dredge Sediment and Water Sampling

Location: Calcasieu River Bar Channel, 2 to 25 miles offshore of Cameron, LA

Project Features

  • Offshore Sediment & Water Sampling
  • Ponar Dredge Sediment Sampling
  • Discrete & Composite Sampling of Specific Materials
  • Extremely Time Sensitive Performance

Project Summary

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Annual dredging of the Calcasieu River Bar Channel is required to maintain navigation channel dimensions. The Regional Implementation Agreement (RIA), jointly developed by the Environmental Protection Agency (EPA) and U.S. Army Corps of Engineers New Orleans District (CEMVN), requires periodic (every 5 years) evaluation of dredge materials proposed for offshore disposal in the Gulf of Mexico.

Tasked by the CEMVN, JESCO collected offshore bottom channel sediment and water samples and prepared a post-sampling report needed to determine the impact potential (biological and chemical) of offshore dredge sediment disposal. Samples were collected from in and near the Calcasieu River Bar Channel, offshore of Holly Beach and 7 to 25 miles south of Cameron, LA. Sediment samples (64 totaling 130 gallons) were collected from 9 in-channel stations distributed among 3 Dredged Material Management Units (DMMUs); and 3 Reference Area stations.

Water samples (31 totaling 50 gallons) were collected from 3 in-channel stations distributed among the fore mentioned 3 DMMUs, Ocean Dredged Material Disposal Site (ODMDS) #2, and ODMDS #3. Sediment sample locations were based upon bathometric survey data, and exact sample locations were determined in the field based upon collection of material representative of either in-channel deposited unconsolidated sediments or native, near channel reference sediments. Water temperature, salinity, pH, and dissolved oxygen content were measured and recorded at the water surface, mid-depth, and bottom depth of each sampling station. Adherence to extremely limited analytical hold times required rapid sample collection and delivery and close coordination with the USACE Engineer Research and Development Center (ERDC) laboratory to facilitate immediate post-delivery sample processing.

To meet analytical hold time requirements, all samples were collected in 3 consecutive work days, with samples delivered to the laboratory on the 4th day.

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