A. 
For each phase of development, the developer shall provide notification to the Township Engineer and the Township a minimum three days prior to the installation of the permanent stormwater control facilities so that general observation of the work can be scheduled. The developer shall furnish to the Township record drawings of the subject facilities (including detention basin grades) which are certified by a registered land surveyor. Full acceptance and approval of the stormwater management facilities will not occur until installation is observed to be acceptable and record plans are approved.
B. 
If at any stage of the work the Township Engineer determines that the permanent stormwater control facilities are not being installed in accordance with the approved development plan, the Township shall revoke any existing permits until a revised development plan is submitted and approved as required by § 296-24.
C. 
DEP or its designees (e.g., County Conservation District) normally ensure compliance with any permits issued, including those for stormwater management. In addition to DEP compliance programs, the Township or its designee may inspect all phases of the construction, operations, maintenance, and any other implementation of stormwater BMPs.
D. 
During any stage of the regulated earth disturbance activities, if the Township or its designee determines that any BMPs are not being implemented in accordance with this chapter, the Township may suspend or revoke any existing permits or other approvals issued by the Township until the deficiencies are corrected.
The green infrastructure and low impact development practices provided in the BMP Manual[1] shall be utilized for all regulated activities wherever possible. Water volume controls shall be implemented using the design storm method in Subsection A or the simplified method in Subsection B below. For regulated activity areas equal or less than one acre that do not require hydrologic routing to design the stormwater facilities, this chapter establishes no preference for either methodology; therefore, the applicant may select either methodology on the basis of economic considerations, the intrinsic limitations on applicability of the analytical procedures associated with each methodology and other factors.
A. 
The design storm method (CG-1 in the BMP Manual[2]) is applicable to any size of regulated activity. This method requires detailed modeling based on site conditions.
(1) 
Do not increase the post-development total runoff volume for all storms equal to or less than the two-year twenty-four-hour duration precipitation.
(2) 
For modeling purposes:
(a) 
Existing (predevelopment) nonforested pervious areas must be considered meadow in good condition.
(b) 
Enter a percentage (no less than 20%, up to 100%) of existing impervious area, when present, shall be considered meadow in good condition in the model for existing conditions.
[2]
Editor's Note: See § 296-61D.
B. 
The simplified method (CG-2 in the BMP Manual[3]) provided below is independent of site conditions and should be used if the design storm method is not followed. This method is not applicable to regulated activities greater than one acre or for projects that require design of stormwater storage facilities. For new impervious surfaces:
(1) 
Stormwater facilities shall capture at least the first two inches of runoff from all new impervious surfaces.
(2) 
At least the first one inch of runoff from new impervious surfaces shall be permanently removed from the runoff flow, i.e., it shall not be released into the surface waters of this commonwealth. Removal options include reuse, evaporation, transpiration, and infiltration.
(3) 
Wherever possible, infiltration facilities should be designed to accommodate infiltration of the entire permanently removed runoff; however, in all cases at least the first 0.5 inch of the permanently removed runoff should be infiltrated.
(4) 
This method is exempt from the requirements of § 296-28, Rate controls.
[3]
Editor's Note: See § 296-61D.
[1]
Editor's Note: See § 296-61D.
A. 
For areas not covered by a release rate map from an approved Act 167 Stormwater Management Plan:
(1) 
Post-development discharge rates shall not exceed the pre-development discharge rates for the one-, two-, five-, twenty-five-, fifty-, and 100-year, twenty-four-hour storm events. If it is shown that the peak rates of discharge indicated by the post-development analysis are less than or equal to the peak rates of discharge indicated by the pre-development analysis for one-, two-, five-, twenty-five-, fifty-, and 100-year, twenty-four-hour storms, then the requirements of this section have been met. Otherwise, the applicant shall provide additional controls as necessary to satisfy the peak rate of discharge requirement.
B. 
For areas covered by a release rate map from an approved Act 167 Stormwater Management Plan:
(1) 
For the one-, two-, five-, ten-, twenty-five-, fifty-, and 100-year, twenty-four-hour storm events, the post-development peak discharge rates will follow the applicable approved release rate maps. For any areas not shown on the release rate maps, the post-development discharge rates shall not exceed the pre-development discharge rates.
A. 
In order to protect and improve water quality, a riparian buffer easement shall be created and recorded as of any subdivision or land development that encompasses a riparian buffer.
B. 
Except as required by Chapter 102, the riparian buffer easement shall be measured to be the greater of the 100-year floodplain or a minimum of 35 feet from the top of the streambank (on each side).
C. 
Minimum management requirements for riparian buffers.
(1) 
Existing native vegetation shall be protected and maintained within the riparian buffer easement.
(2) 
Whenever practicable invasive vegetation shall be actively removed, and the riparian buffer easement shall be planted with native trees, shrubs, and other vegetation to create a diverse native plant community appropriate to the intended ecological context of the site.
D. 
The riparian buffer easement shall be enforceable by the Township and shall be recorded in the appropriate County Recorder of Deeds Office, so that it shall run with the land and shall limit the use of the property located therein. The easement shall allow for the continued private ownership and shall count toward the minimum lot area required by Zoning, unless otherwise specified in the Township Zoning Ordinance.
E. 
Any permitted use within the riparian buffer easement shall be conducted in a manner that will maintain the extent of the existing 100-year floodplain, improve or maintain the stream stability, and preserve and protect the ecological function of the floodplain.
F. 
The following conditions shall apply when public and/or private recreation trails are permitted within riparian buffers:
(1) 
Trails shall be for nonmotorized use only.
(2) 
Trails shall be designed to have the least impact on native plant species and other sensitive environmental features.
G. 
Septic drainfields and sewage disposal systems shall not be permitted within the riparian buffer easement and shall comply with setback requirements established under 25 Pa. Code Chapter 73.