Table 3.11-1 in section 3.11 of the stormwater handbook (bioretention) explicitly shows two target P removal efficiencies based on whether the bioretention BMP is designed for 1xWQV or 2xWQV. Table 1 in section 4VAC50-60-1184. Water quality. does not show bioretention as a viable technology based BMP for the 66% -100% impervious cover range. Infiltration and extended detention BMPs are included in multiple technology based cover ranges based on varying design criteria and the "multiple" of the WQV treated. It seems that the 2xWQV bioretention design should be included as a 65% removal option.