The following permit requirements apply to certain regulated
and earth-disturbance activities and must be met prior to commencement
of regulated and earth-disturbance activities, as applicable:
A. All regulated and earth-disturbance activities, subject to permit
requirements by DEP under regulations at 25 Pa. Code Chapter 102.
B. Work within natural drainageways, subject to permit by DEP under
25 Pa. Code Chapter 102 and Chapter 105.
C. Any stormwater management facility that would be located in or adjacent
to surface waters of the commonwealth, including wetlands, subject
to permit by DEP under 25 Pa. Code Chapter 105.
D. Culverts, bridges, storm sewers or any other facilities which must
pass or convey flows from the tributary area and any facility which
may constitute a dam, subject to permit by DEP under 25 Pa. Code Chapter
105.
This section is applicable only to the Perkiomen Creek Headwaters
Watershed District.
A. The entire WQv as calculated in §
415-13B shall be captured and treated by either direct recharge or evapotranspiration BMPs.
B. Lawn area up to a maximum of 33% of the entire site area may be allowed
to bypass water quality BMPs. As much proposed impervious area as
practical shall be directed to water quality BMPs.
C. Existing impervious area that is not proposed to be treated by direct
recharge BMPs should be excluded from all water balance calculations.
D. A maximum of 30% of the total annual rainfall for a site may be directly
recharged to groundwater using direct recharge BMPs, for runoff from
impervious areas.
(1) For development sites with greater than thirty-three-percent proposed
impervious cover:
(a)
If all impervious cover is directed to evapotranspiration BMPs
to capture the entire two-year, twenty-four-hour event, the direct
recharge standard is met.
(b)
Up to 33% of the site as impervious cover may be directed to
direct recharge BMPs designed to capture the entire two-year, twenty-four-hour
event. All remaining impervious cover shall be directed to evapotranspiration
BMPs designed to capture the remainder of the WQv.
(c)
For evapotranspiration and/or direct recharge BMPs designed
for runoff from impervious areas designed to capture less than entire
two-year, twenty-four-hour event, Appendix C shall be used to assure
that the maximum direct recharge standard is met.
(2) For development sites with less than thirty-three-percent proposed
impervious cover, all proposed impervious and the entire WQv may be
directed to direct recharge BMPs.
(3) The maximum thirty-percent direct recharge standard applies on an
overall site basis, rather than in each drainage direction.