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Permit No. VA0088641
Page 23 of 42
Table 1a
Calculation Sheet for Estimating Existing Source Loads and Reduction Requirements for the James River, Lynnhaven and Little Creek Basins
Through (June 30, 2026)
A B C D E F G
Existing developed Percentage of 40% cumulative
lands as of 6/30/09 MS4 required Percentage of reduction Sum of 40%
served by the MS4 Chesapeake Bay L2 required required by June cumulative
Loading rate within the regulated Load total L2 loading reduction by 30, 2026 reduction
Pollutant Subsource (lbs/ac/yr)1 area (acres)2 (lbs/yr)3 reduction June 30, 2026 (lbs/yr)4 (lbs/yr)5
Regulated urban
9.39 9% 40%
impervious
Nitrogen
Regulated urban
6.99 6% 40%
pervious
Regulated Urban
1.76 16% 40%
Impervious
Phosphorus
Regulated urban
0.5 7.25% 40%
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 x Column E.
5Column G = The sum of the subsource cumulative reduction required by June 30, 2026 (lbs/yr) as calculated in Column F.Jump to an indexed page (43 of 43)