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Sample Descriptions
Samples T1-T30
Preliminary samples T1-T30 were collected in paired sets to assess instantaneous
filtration efficiency for a specific study application. The individual upstream samples for
the set T1-T12 were collected near the fabric at mid-range depths of retained flows. For
site 1, minor downstream flow concentrations facilitated in-stream sample collections
(see Figure A3 in Appendix A). For Sites 2 and 3, the downstream sample was carefully
collected from the surface flow of the fabric adjacent to the upstream sample location (see
Figures A4 and A5 in Appendix A). Sample T13 was collected after long term retention
of an upstream pool to evaluate the effects of increased holding times.
Samples T15-T24 (see Figure A6 in Appendix A) and T25-T30 (see Figure A7 in
Appendix A) of Site 1 were collected according to the original methodology. In these
instances, the downstream flow concentration was minimal and the majority of
downstream samples were collected at the face of the fabric.
Samples T31-T48
Samples T31-T48 were collected as multiple, individual, non-paired samples at
various upstream and downstream locations in order to explore possible particle loading
distributions. Samples T31-T42 of Site 4 (see Figure A8 in Appendix A) were collected
at various locations within the upstream pond and various downstream locations along
the internal walls of an uncovered inlet. During this collection opportunity at Site 4, the
upstream retention was sheet-like in nature and ponding depths were minimal. Samples
T43-T48 (see Figure A9 in Appendix A) were gathered in a similar fashion at site 1.
Although multiple location sampling was not appropriate for the small downstream flow
channel, three samples were taken at a single location to examine consistency. Individual
samples were collected throughout the upstream pond.
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