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Page Title: C.3 Rainfall Simulator/Lysimeter System (RSLS) Procedure for Evaluation of Surface Runoff Quality
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be used to ensure effective oxidation of sediment. Samples are then transferred
to the 4-L bottles after oxidation is complete and deionized water is added to
bring the total volume of all samples to 1 L. The samples are shaken for 1 hr as
described above, and on-half of the samples are immediately placed in the
Nalgene containers and preserved with nitric acid to pH 2.0. The remaining
halves are then filtered as described for the wet sediment.
Step 3 - Chemical Analyses. The samples should be analyzed as soon as
possible after extraction. Dissolved and, if required, total concentrations of
desired analytes in the samples should be determined. (If water quality standards
for chemical contaminants are in terms of dissolved concentrations, the total
concentration of contaminants in the runoff samples need not be determined).
C.3 Rainfall Simulator/Lysimeter System (RSLS)
Procedure for Evaluation of Surface Runoff
Quality
The Waterways Experiment Station (WES)/U.S. Army Engineer Research
and Develoment Center (ERDC) rainfall simulator lysimeter system (RSLS)
predicts these effects so that restrictions and/or treatments, such as controlling
movement of suspended solids or providing adequate mixing zones, can be
incorporated into the CDF design. The testing protocol for surface runoff
quality using the RSLS has been applied to dredged material from a number of
locations. Contaminants have included heavy metals, PAHs, PCBs, pesticides,
organotins, and dioxins. Although the RSLS is a very effective tool for
predicting surface runoff quality from upland CDFs, the procedure is time-
consuming, requires a large volume of sediment, and can only be conducted at
the WES/ERDC. However, when the SLRP predicts exceedence of water
quality standards (WQS) after consideration of mixing, the RSLS test may be
used to satisfy the requirements for Section 401 water quality certification.
C.3.1 Materials and apparatus
The following equipment and materials are required to conduct the RSLS
procedure.
Apparatus/Equipment.
a. Rainfall simulator/lysimeter system (see description below).
b. Sampling pump with a minimum of 6 L/min pumping rate.
c. Millipore microanalysis vacuum filter apparatus.
d. 0.45-um membrane filters.
e. 0.7-um glass fiber filters without binders, Type GF/F.
C6
Appendix C Test Procedures for Surface Runoff Discharges

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