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Permit No. VA0088641
Page 24 of 42
Table 1b
Calculation Sheet for Estimating Existing Source Loads and Reduction Requirements for the James River, Lynnhaven and Little Creek Basins
Through (June 30, 2028)
A B C D E F G
100%
Percentage cumulative
Existing developed of L2 reduction Sum of
lands as of 6/30/09 required required 100%
Loading served by the MS4 reduction by June cumulative
rate within the regulated Load Percentage of MS4 required by June 30, 2028 reduction
Pollutant Subsource (lbs/ac/yr)1 area (acres)2 (lbs/yr)3 Chesapeake Bay total L2 loading reduction 30, 2028 (lbs/yr)4 (lbs/yr)5
Regulated
urban 9.39 9% 100%
impervious
Nitrogen
Regulated
urban 6.99 6% 100%
pervious
Regulated
Urban 1.76 16% 100%
Impervious
Phosphorus
Regulated
urban 0.5 7.25% 100%
pervious
1Edge of stream loading rate based on the Chesapeake Bay Watershed Model 5.3.2
2To determine the existing developed acres required in Column B, permittees should first determine the extent of their regulated MS4 service area. Next, permittees will need to delineate
the lands within the regulated area served by the MS4 as pervious or impervious as of the baseline date of June 30, 2009.
3Column C = Column A x Column B
4Column F = Column C x Column D
5Column G = The sum of the subsource cumulative reduction required by June 30, 2028 (lbs/yr) as calculated in Column F.Jump to an indexed page (43 of 43)