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Dredging and the Disposal of Dredged Material

Dredging and the Disposal of Dredged Material

The video above is an ANAMAR production presented by Paul Berman, ANAMAR’s Quality Assurance/Quality Control Officer, explaining some of the purposes and processes related to dredging. The information below is an excerpt from the Southeastern Regional Implementation Manual (SERIM) explaining further details of the steps that are taken to minimize the impact of dredged material disposal.

Sampling Reference Stations

Excerpted from the Southeastern Regional Implementation Manual (SERIM)

4.3 Sampling Reference Stations

For dredged material evaluations for ocean disposal, the test results from proposed dredging site samples are compared to test results from appropriate reference site sediments. Reference sediment is defined as “A sediment, substantially free of contaminants, that is as similar to the grain size of the dredged material and the sediment at the disposal site as practical, and reflects conditions that would exist in the vicinity of the disposal site had no dredged-material disposal ever occurred, but had all other influences on sediment condition taken place” (1991 Green Book, Section 3.1.2). Reference sediment sampling stations are selected to simulate conditions at the proposed disposal site in the absence of past dredged material disposal. Reference sediments must be collected for each evaluation. Results from previous evaluations are not acceptable. Test organisms should be selected to minimize sensitivity to possible sediment grain size differences among the reference site, the control site, and the proposed dredging site.

Using historical reference sites and EPA Region 4 studies of reference areas, EPA Region 4 has identified preferred reference sites for each ODMDS for various grain size distributions. These sites are identified in Appendix K. One or more of these sites may be used and should be selected based on the grain size of the proposed dredged material. These reference areas shall be utilized. Alternative reference sites will be approved on a case-by-case basis.

Reference sediments may be collected from (1) a single reference-sediment sampling location; or (2) from a number of approved locations. Reference samples may be composited and tested according to guidance provided in Chapter 8 of the 1991 Green Book.

Replicate sediment samples should be collected at the reference site(s) using an appropriate collection device [see Table 5 for the EPA QA/QC Guidance (EPA, 1995)]. In most cases, a grab sample is adequate for reference sediment stations. Replicates may be composited into a single sample [see Chapter 8 of the 1991 Green Book or Chapter 4 of EPA (2001b) for guidance]. The collected sediment should be of sufficient quantity to conduct all required testing. A minimum of three replicate sediment samples from the reference site(s) should be collected for all testing [i.e., three grabs at one site or one grab at three sites or any other combination for a minimum of three grabs].

Citation: USEPA/USACE. 2008. Southeast Regional Implementation Manual (SERIM) for Requirements and Procedures for Evaluation of the Ocean Disposal of Dredged Material in South­eastern U.S. Atlantic and Gulf Coast Waters. EPA 904-B-08-001. U.S. Environmental Protection Agency Region 4 and U.S. Army Corps of Engineers, South Atlantic Division, Atlanta, GA. 2008.pdf

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