Common use of Sample Collection Requirements Clause in Contracts

Sample Collection Requirements. This table contains general guidance on the type of samples that may be required to be collected in the field to conduct dredged material evaluation tests. Tests Water Samples Sediment Samples Purpose Disposal Site Dredging Site Control Dredging Site Reference Site Control Tier II Water Column Screen • • Chemical analyses of disposal site water and dredging site sediments are required for model inputs. Elutriate • • • Dredging site water and sediments are used for elutriate preparation. Chemical analysis of the liquid phase of the dredged material elutriate is used to determine compliance with WQC/WQS. Chemical analysis of disposal site water and liquid phase of the elutriate is required for model inputs. Tier II Benthic • • Chemical and physical analyses of dredging site sediment samples and reference site sediment samples are required for TBP calculations. Tier III Water Column SPP Toxicity Test • • • • Organisms are exposed to dilution water, control water and the dredged material dilution series. Dredging site water and sediments are used for elutriate preparation. Disposal site water or artificial sea water may be used for dilutions. Control water is required for bioassay test acceptance. Tier III Benthic Solid Phase Toxicity Test and Bioaccumulation Test • • • • Organisms are exposed to dredging site sediments, reference sediment and control sediment for toxicity and bioaccumulation bioassays. Control sediment is required for bioassay test acceptance. Chemical analyses of organism tissues are required for bioaccumulation tests. Disposal site water, clean sea water or artificial sea water may be used to conduct bioassays. The reference areas are located within 2 - 5 nautical miles of the ODMDS and at a location opposite the direction of net transport. The reference area sediment sample for a given project must be a composite comprised of a minimum of three samples. See Appendix D for reference area locations for ODMDS in Texas and Louisiana. Reference areas for Section 103 permit applicants will be determined on a case-by-case basis.