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Samples T49-T108
Samples T49-T108 were secured as multiple individual samples per stage per site.
(Stage in this context refers to the category of sampling location.) In addition to the
upstream pond stage, samples were collected in contributary flow concentrations adjacent
to the upstream retention area to further explore overall efficiencies associated with the
study installations. In order to differentiate samples collected in this manner, upstream
contributary samples are designated with an upstream c descriptor, and samples collected
from upstream ponds are designated with an upstream p descriptor in data and results
tables.
Samples T49-T72 were collected similarly at Site 6. Multiple, individual samples
were collected for each stage: upstream flow concentrations, upstream pond locations,
and downstream locations. Since there were minor unfiltered flows from sources exterior
to the system, downstream samples were gathered at the filter face. Sample groups T49-
T60 (see Figure A10 in Appendix A) and T60-T72 (see Figure A11 in Appendix A) were
collected from the same event at a time differential of approximately 1.5 hours so that
changes resulting over time could be identified.
Samples T72-T84 (see Figure A12 in Appendix A) were collected at Site 3
according to the methodology described for the group. The majority of downstream
samples were collected along the face of the fence, although a single sample was
collected in a small flow concentration.
Samples T85-T96 (see Figure A13 in Appendix A) were collected in a similar
fashion at Site 6. Unfiltered flows from external sources at the downstream stage were
observed, and attempts to select and sample isolated in-stream locations were performed.
Additional downstream samples were collected at the face of the fence. Over-topping
resulting from large retention volumes precluded ordinary downstream sampling for set
T97-T108 (see Figure A14 in Appendix A). In this case, samples were gathered from
flows downstream in relation to a recently installed rock berm. Any samples attributed
strictly to the operation of a rock berm are differentiated by the bolding of the sample
descriptor in the data and results tables.
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