Owner’s Name:

Property Owner Phone Number:

Property Owner Address:

Parcel Number:

Email:

Small Project Checklist

Check for $150 payable to Sadsbury Township

Sign and Date Ownership Acknowledgement (listed below)

Fill out Small Project Calculations (Step 1, below)

Select a proposed BMP and attach it to this page (Step 2, Infiltration Bed BMP or Shed BMP) *Either or both BMPs may be selected as necessary to manage impervious area

Infiltration Bed-BMP

Shed-BMP ___ Attach sketch of the property including proposed improvements (see Sample Sketch)

Has the 1,000 sq. foot exemption been used on this property since year 2008 when the Township adopted the stormwater ordinance? Yes ___ No___ Partial___(how many sq feet)

If the above answer was No, do you plan to use it now? ___Yes (how many sq feet? ___ No

Paragraph

Small Project Calculations Step 1:  Determine the total area to be managed (ft2) including roof, driveway, walk, patio and/or other impervious area.  Once this table is complete proceed to Step 2.

*Total must be under 5,000 sq ft to qualify for a small project

Length(ft)

Width(ft)

Impervious Area(ft2)

Length(ft)

Width(ft)

Impervious Area(ft2)

Length(ft)

Width(ft)

Impervious Area(ft2)

Length(ft)

Width(ft)

Impervious Area(ft2)

Length(ft)

Width(ft)

Impervious Area(ft2)

(a) Sum of all impervious area

(b) Subtract any impervious area being removed

*Total area to be managed (a) – (b)

Stone Infiltration Trench – General Notes

1.	Use the worksheets and table to compute the required volume in the stone infiltration trench (in cubic feet) for all proposed impervious areas.  The calculated total volume is the minimum requirement for on-site construction.  The actual horizontal dimensions of the stone infiltration trench may vary to fit specific site configurations and constraints, but the vertical depth of the stone infiltration trench must be a minimum of twenty-four (24) inches and a maximum of forty (40) inches.  The total volume of the stone infiltration trench must be equal to or greater than the required minimum.

2.	Multiple stone infiltration trenches may also be utilized.  If multiple stone infiltration trenches are desired, the volume for each stone infiltration trench should be a proportional amount of the calculated total storage volume (if utilizing two (2) trenches; if sixty (60) percent of the total roof area is piped to one (1) stone infiltration trench, then that stone infiltration trench should be sized for sixty (60) percent of the total required minimum volume.  The second stone infiltration trench would be sized for the remaining forty (40) percent of the total required minimum volume).

3.	Based on the calculations of the required stone infiltration trench dimensions computed using the worksheet and table, stake out the locations of the stone infiltration trench corners.  Staking is critical and should outline the location of the stone infiltration trench.  The stone infiltration trench shall be located as far as possible downslope from the proposed home.  A minimum of ten (10) feet of undisturbed soil shall be provided between the stone infiltration trench and any adjoining building or structure.  Maintain a minimum of ten (10) feet between the stone infiltration trench and any property lines and road rights-of-way.  Stone infiltration trenches shall be located beside or downslope (not upslope of) and a minimum of ten (10) feet from of any component of any on-lot sewage disposal system or on-lot sewage disposal system replacement absorption area.

4.	Excavation of the stone infiltration trench shall be conducted from outside of the stone infiltration trench perimeter, using equipment which has a bucket on a reaching arm (backhoe or track hoe).  No equipment shall be permitted in or on the stone infiltration trench area.  The bottom and sides of the stone infiltration trench shall be chiseled or ripped to break up any smearing or compaction that may have occurred during excavation.

5.	After excavation of the stone infiltration trench is complete, ensure that the bottom is graded with a slope that is no greater than two (2) inches per one hundred (100) feet.  Line the stone infiltration trench and sides with a Class 1 Geotextile filter fabric, leaving enough excess filter fabric to cover the top of the stone infiltration trench before it is backfilled with earthen fill.  If multiple runs of filter fabric are required to completely enclose the stone infiltration trench, a minimum of twelve (12) inches overlapping must be provided.

6.	Backfill the stone infiltration with clean aggregate (clean washed stone with no fines in the range of coarse aggregate sizes from AASHTO#1 to AASHTO#57).  Backfilling of the stone infiltration trench shall be conducted from outside of the stone infiltration trench perimeter, using equipment which has a bucket on a reaching arm (backhoe or track hoe).  No equipment shall be permitted in or on the stone infiltration trench area.  The stone infiltration trench shall be to a uniform depth a minimum of six (6) inches below the finished top of stone (a minimum of eighteen (18) inches below finished grade).

7.	The perforated pipe (minimum four (4) inch PVC) with cleanout pipe extension should then be placed on the stone.  Connect roof drain pipes from downspouts to the stone infiltration facility.  Be sure to leave the pipes exposed for observation by the Township.

8.	At this time, before more stone is placed in the infiltration trench to cover the pipe, or roof leaders trenches are backfilled, the Township should be notified for inspection of the facility to verify proper pipe installation.

9.	Following the Township inspection, ass more stone around and over the pipe to a uniform depth a minimum of two (2) inches over the top of the pipe.  Carefully over the top of the stone bed with the remaining geotextile fabric, being careful to overlap a minimum of twelve (12) inches.

10.	The infiltration trench should be then backfilled to the top of the infiltration trench with at lease twelve (12) inches of clean earth fill.

11.	To ease maintenance of the underground pipes, and prevent clogging of the infiltration trench, consideration should be given to providing screens for all roof gutters.  The screens prevent foreign materials from clogging the pipes and stone infiltration trench.

12.	During and after construction, care must be taken to keep all dirty stormwater and silt out of the system.

Property Sketch Checklist: The following items should be included on the sketch if applicable:

Location and square footage of proposed impervious area

Approximate location of all property lines, driveways and buildings on the property

Approximate location of all structures, trees, fences or other items located within 50 feet of the proposed impervious area or land disturbance

Approximate distance from proposed buildings or structures to the nearest property line and street

Direction of proposed stormwater discharge (e.g., with flow arrows)

Location of existing wells and septic system

North arrow

Applicant is encouraged to use Google Earth or similar mapping software for the property sketch.

Please Upload A Sketch Of Your Project To This Application

Maximum file size: 516MB

Infiltration Bed - BMP

Step 2:  Determine size of infiltration bed.  Select required bed area from the sizing chart below.  If the area to be managed (from Step 1) is between two values, round up to the higher value.  Then enter length, width and resulting bed area(s) into the infiltration bed size table below.

Sizing Chart

Bed Number

Length (L)

Width (W)

Proposed Bed Area (L x W)

Bed Number

Length (L)

Width (W)

Proposed Bed Area (L x W)

Bed Number

Length (L)

Width (W)

Proposed Bed Area (L x W)

Bed Number

Length (L)

Width (W)

Proposed Bed Area (L x W)

Total

Notes

1.	The above charts assume a trench or bed of 2’ in depth.  If alternate bed or trench depths are being designed then the length and width calculations need to be adjusted to maintain the cubic feet.
2.	All PVC pipe to be schedule 35 pipe or greater.
3.	For infiltration beds to handle projects larger than 3,000 sq. ft. the PVC pipe needs to be 6” or larger.
4.	The sump/inlet box can be outside or inside the perimeter of the bed.
5.	The above charts and tables are only for small stormwater projects.

Infiltration Bed – BMP (Roof Area Only)

Step 2:  Determine size of infiltration bed.  Select required bed area from the sizing chart below.  If the area to be managed (from Step 1) is between two values, round up to the higher value.  Then enter length, width and resulting bed area(s) into the infiltration bed size table below.

Sizing Chart

Bed Number

Length (L)

Width (W)

Proposed Bed Area (L x W)

Bed Number

Length (L)

Width (W)

Proposed Bed Area (L x W)

Bed Number

Length (L)

Width (W)

Proposed Bed Area (L x W)

Bed Number

Length (L)

Width (W)

Proposed Bed Area (L x W)

Total

Notes

6.	The above table is only applicable to projects with disturbed areas of less than one (1) acre.  Any projects that propose more than one (1) acre of disturbed area are subject to E&S and NPDES Permit requirements and will require a formal Stormwater Management Plan.
7.	All PVC pipe to be schedule 40 or approved equal.
8.	Perforated pipe to contain a minimum of 3 holes per row.  The maximum spacing between rows is 12”.

Owner Acknowledgement:

I declare that I am the property owner and that the information provided is accurate to the best of my knowledge.  I understand that stormwater may not adversely affect adjacent properties or be directed onto another property without written permission.  I also understand that false information may result in a stop work order or revocation of any associated permits.  Township representatives are also granted reasonable access to the property for review and/or inspection of this project as necessary.

Date:

Signature:

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