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Permit No. VA0088641
Page 25 of 42
c) Required Reductions: No later than June 30, 2028, the permittee shall offset 100% of the increased loads
from the following:
1) New sources initiating construction between July 1, 2009 and June 30, 2024 and designed in accordance
with 9VAC25-870-47 and 9VAC25-870-93 et seq.; and
2) Projects grandfathered in accordance with 9 VAC 25-870-48, that disturb one acre or greater as a result
of the utilization of an average land cover condition greater than 16% impervious cover for the design of
post development stormwater management facilities.
The permittee shall utilize Table 2 included herein to develop the equivalent pollutant load for nitrogen for
grandfathered sources meeting the requirements of this condition.
Table 2: Ratio of Phosphorus Loading Rate to Nitrogen Loading Rates for
Chesapeake Bay Basins
(Based on Chesapeake Bay Program Watershed Model Phase 5.3.2)
Ratio of Phosphorus to
Other POCs (Based on
All Land Uses 2009 Phosphorus Loading Nitrogen Loading Rate
Progress Run) Rate (lbs/ac) (lbs/ac)
James River Basin 1.0 5.2
d) Reductions achieved in accordance with the Permit for Discharges of Stormwater from Municipal Separate
Storm Sewer Systems effective July 1, 2016, shall be applied toward the total reduction requirements to
demonstrate compliance with Part I.D.1.b) and c).
e) Reductions required under Part I.D.1 b) and c) shall be achieved in each river basin in which the existing
development, new development and grandfathered projects are located.
f) Loading and reduction values greater than or equal to 10 pounds calculated in accordance with Part I.D.1.b)
and c) shall be calculated and reported to the nearest pound without regard to mathematical rules of
precision. Loading and reduction values of less than 10 pounds reported in accordance with Part I.D.1.b)
and c) shall be calculated and reported to two significant digits.
g) Reductions required in Part I.D.1.b) and c) shall be achieved through one or more of the following:
1) BMPs approved by the Chesapeake Bay Program;
2) BMPs approved by the Department; or
3) A trading program described in Part I.D.1.h).
h) The permittee may acquire and use total nitrogen and total phosphorous credits in accordance with § 62.1-
44.19:21 of the Code of Virginia for purposes of compliance with the required reductions in Table 1 contained
herein, provided the use of credits has been approved by the Department. The exchange of credits is subject
to the following requirements:
1) The credits are generated and applied to a compliance obligation in the same calendar year;
2) The credits are generated and applied to a compliance obligation in the same tributary;Jump to an indexed page (43 of 43)