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Footnote
Several issues require clarification to fully understand the scope and
intent of this management measure. First, this management measure applies only
to postdevelopment loadings and not to construction-related loadings.
Management measure options II.A.(1)(a) and (b) both apply only to the TSS
loadings that are generated after construction has ceased and the site has been
properly stabilized using permanent vegetative and/or structural erosion and
sediment control practices. Second, for the purposes of this guidance, the term
predevelopment refers to the sediment loadings and runoff volumes/velocities
that exist onsite immediately before the planned land disturbance and
development activities occur. Predevelopment is not intended to be interpreted
as that period before any human-induced land disturbance activity has occurred.
Third, management measure option II.A.(1)(b) is not intended to be used as an
alternative to achieving an adequate level of control in cases where high
sediment loadings are the result of poor management of developed sites (not
"natural" sites), e.g., farmlands where the erosion control components of the
USDA conservation management system are not used or sites where land disturbed
by previous development was not permenently stabilized.
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