Pollutant Reduction Plan - Spring Township€¦ · Pollutants of Concern, Existing Sediment Loading, Proposed Best Management Practices (BMPs), Funding Mechanisms, and Operations

Pollutant Reduction Plan

Logan Branch and Chesapeake Bay

June 16, 2017

Prepared For:

Spring Township

Centre County, PA

1309 Blanchard Street

Bellefonte, PA 16823

Prepared By:

Table of Contents

1.0 Purpose and Scope ............................................................................................................... 1

2.0 Permit Requirements............................................................................................................ 1

3.0 Background/Setting ............................................................................................................. 2

3.1 Logan Branch ........................................................................................................................... 3

3.2 Chesapeake Bay....................................................................................................................... 4

4.0 Pollutant Reduction .............................................................................................................. 4

4.1 Public Participation ................................................................................................................... 4

4.2 Storm Sewersheds.................................................................................................................... 4

4.3 Pollutants of Concern................................................................................................................ 5

4.4 Existing Pollutant Loading.......................................................................................................... 5

4.5 Proposed Best Management Practices (BMPs) ........................................................................... 6

4.6 Funding Mechanisms................................................................................................................ 7

4.7 Operations and Maintenance..................................................................................................... 8

5.0 Conclusion ............................................................................................................................. 8

6.0 Definitions ............................................................................................................................. 8

Appendix A Public Comment and ReponsesAppendix B Developed Land Loading Rates for PA CountiesAppendix C Supporting CalculationsAppendix D Proposed BMP MapAppendix E Storm Sewershed/Land Cover Map

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1.0 Purpose and Scope

Spring Township is required to develop and implement a Pollutant Reduction Plan (PRP) for Municipal

Separate Storm Sewer System (MS4) discharges to Logan Branch and the Chesapeake Bay as part

of the 2018 National Pollutant Discharge Elimination System (NPDES) MS4 Individual Permit

application to the Pennsylvania Department of Environmental Protection (PA DEP). The purposes of

this plan is to improve water quality to surface waters listed as impaired for sediment and/or

nutrients.

This document will serve as the single plan for both the Chesapeake Bay PRP and the Logan Branch

PRP requirements. This plan has been prepared based on the best and most current guidance made

available by PA DEP. Definitions of relevant regulatory terms have been provided in Section 6.0 of

this report.

2.0 Permit Requirements

In order to develop a PRP, it is important to have an understanding of the Township’s requirements.

Spring Township is required by the PA DEP and United States Environmental Protection Agency (EPA)

to reduce sediment loading by ten (10) percent, phosphorous loading by five (5) percent, and nitrogen

loading by three (3) percent from stormwater discharges to the Chesapeake Bay and phosphorous

loading from stormwater discharges to streams impaired by nutrients (Logan Branch) by five (5)

percent over the five (5) year permit term (March 16, 2018 to March 15, 2023) by implementing

projects or Best Management Practices (BMPs).

Spring Township has MS4 discharges or “outfalls” to Logan Branch. Logan Branch is listed by the

2014 Pennsylvania Integrated Water Quality Monitoring and Assessment Report (Integrated Report)

as impaired for Organic Enrichment/Low Dissolved Oxygen (D.O.) (i.e. nutrients). Logan Branch

ultimately drains to the Chesapeake Bay. By satisfying the reduction requirements for Logan Branch,

the Township will also satisfy the reduction requirements for the Chesapeake Bay as further

described in the sections below.

Table 1- MS4 Requirements Table (Municipal) Except

MS4 NameNPDES

ID

IndividualPermit

Required?Reason

ImpairedDownstream Watersor Applicable TMDL

Name

Requirement(s)Other Cause(s) of

Impairment

Spring Twp,Centre County

Yes SP

Chesapeake BayNutrients/Sediment

Appendix D-Nutrients,Siltation (4a)

Logan Branch

Appendix C-PCB (5),Appendix E-Organic

Enrichment/Low D.O.(5)

Bald Eagle CreekAppendix B-

Pathogens (5)

2

Spring Township is required to reduce the phosphorous loading to Logan Branch by five (5) percent

over the five (5) year permit term. To comply with the Chesapeake Bay PRP, it is also required to

reduce sediment by ten (10) percent, phosphorous by five (5) percent, and nitrogen by three (3)

percent within the five (5) year permit term.

3.0 Background/Setting

Spring Township comprises approximately 27 square miles located in the center of Centre County, in

the middle of Pennsylvania. Approximately 800 acres of the western portion of the Township have

been designated as 2010 Urbanized Area (U.S. Census Bureau).

Figure 1: Spring Township Location Map

Figure 2 below displays a map of the streams that cross Spring Township, along with the 2010

Urbanized Area (hatched). Stream segments colored red indicate impaired portions of streams.

Spring Township has a total of seven (7) MS4 outfalls, all of which discharge to the impaired portion

of Logan Branch, and ultimately the Chesapeake Bay. The Urbanized Area define the jurisdictional

limits of the NPDES MS4 permit. The Township is responsible for outfalls that discharge stormwater

from or within the Urbanized Area.

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Figure 2: Spring Township 2010 Urbanized Area and Impaired Streams

3.1 Logan Branch

Logan Branch flows into the western portion of the Township from the south in a northerly direction

and into Spring Creek, near the Township boundary with the Borough of Bellefonte. The segment of

Logan Branch that flows through the Township was listed in 1998 as impaired for polychlorinated

biphenyls (PCBs) (source unknown) and in 2004 for organic enrichment/low D.O. (industrial point

sources). The downstream portion of Logan Branch from Mann Road northward is not listed as

impaired. Table 2 below lists the impairment information from the 2014 Integrated Report.

The Township has seven (7) MS4 outfalls that discharge to the section of Logan Branch listed as

impaired for organic enrichment/low D.O. Refer to Appendices for MS4 mapping.

Table 2: 2014 Integrated Report – Logan BranchImpairment Cause Impairment Source Category Assessed Use Date Listed

Organic Enrichment/Low D.O. Industrial Point Source 5 Aquatic Life 2004

PCB Source Unknown 5 Fish Consumption 1998

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3.2 Chesapeake Bay

Logan Creek flows into Spring Creek, which drains to Bald Eagle Creek, then the North Branch of the

Susquehanna River, then the Susquehanna River, and ultimately reaches the Chesapeake Bay. The

actions taken to reduce phosphorous loading to Logan Creek by five (5) percent will also address the

PRP requirements of the Chesapeake Bay, as illustrated further in the sections below.

The seven (7) MS4 outfalls that discharge to Logan Branch also ultimately drain to the Chesapeake

Bay. Refer to Appendices for MS4 mapping.

4.0 Pollutant Reduction

Per the MS4 permit and PRP Instructions document (3800-PM-BCW0100k Rev. 3/2017), the

following sections are addressed and described below: Public Participation, Storm Sewersheds,

Pollutants of Concern, Existing Sediment Loading, Proposed Best Management Practices (BMPs),

Funding Mechanisms, and Operations and Maintenance.

4.1 Public Participation

Spring Township made this plan available to the public to review and provide comment for thirty (30)

days. A copy of the public notice was published as required, initiating the 30 day comment period,

and is in Appendix A. All timely comments received and a record of consideration of these comments

will be located in Appendix A.

The PRP will be presented at the Board of Supervisors workshop meeting on August 7, 2017.

Comments will be accepted at this meeting from any interested members of the public.

4.2 Storm Sewersheds

Storm sewersheds that drain to each of the seven (7) outfalls were manually delineated in ArcMap

10.5 using two (2) foot topographic contours from the 2006-2008 PAMAP Program data published

by the Pennsylvania Department of Conservation and Natural Resources (DCNR), while referencing

Google Street View and multiple sources of aerial imagery.

“Parsing” provides an opportunity to eliminate areas within storm sewersheds from the existing

pollutant load that do not drain to the MS4 and areas that are already covered by an NPDES permit

for the control of stormwater. No areas were parsed out of the storm sewersheds in the development

of this plan. No storm sewersheds extend outside of the municipal boundary. Therefore, the storm

sewershed boundaries are synonymous with the planning area boundaries. A map illustrating the

storm sewersheds can be found in Appendix E.

The following table (Table 3) includes a list of outfalls and the associated storm sewershed acreage

that drain to each outfall.

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Table 3: Storm Sewershed Acreage by Outfall

Receiving Water Outfall Number Storm Sewershed (acres)

Logan Branch/Chesapeake Bay

1 0.112 20.493 82.214 57.335 0.326 0.047 0.28

TOTAL 160.78

4.3 Pollutants of Concern

There are three (3) pollutants of concern that Spring Township is required to address: sediment,

phosphorous and nitrogen. To meet the requirements, minimum reductions of ten (10) percent

sediment, five (5) percent phosphorous, and three (3) percent nitrogen have been demonstrated in

this plan.

4.4 Existing Pollutant Loading

To determine the existing pollutant loading to Logan Branch and the Chesapeake Bay, the general

methodology described in the DEP guidance document entitled “Pollution Reduction Plan: A

Methodology” was utilized.

Utilizing ArcGIS 10.5, 2011 National Land Cover Dataset (NLCD) data, the acreage of each land cover

classification type within the storm sewersheds was calculated. The aggregate NLCD statistics within

the storm sewersheds for each impaired receiving water is compiled below (Table 4) with a

breakdown of the area by land cover classification type. Refer to Appendix F for the Land Cover Map.

Table 4: NLCD 2011 Land Cover to Impervious/Pervious Conversion

ReceivingWaters

Number of StormSewersheds within

HUC 12

NLCD Land CoverClassification

Area(acres)

PercentImpervious

ImperviousArea (acres)

PerviousArea

(acres)

LoganBranch/

ChesapeakeBay

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Developed, Open Space 57.73 19 10.97 46.76

Developed, LowIntensity

63.65 49 31.19 32.46

Developed, MediumIntensity

1.18 79 0.93 0.25

Hay/Pasture 14.09 0 14.09Cultivated Crops 6.85 0 6.85Deciduous Forest 17.28 0 17.28

TOTAL 160.78 43.09 117.69

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“Developed” land cover classifications were then converted to percent impervious coverage based

on the NLCD 2011 definitions. The impervious percentages used are as follows:

Developed, Open Space – 19% impervious

Developed, Low Intensity – 49% impervious

Developed, Medium Intensity – 79% impervious

Developed, High Intensity – 100% impervious

All other land cover classifications were assumed to be 100 percent pervious. The “Developed Land

Loading Rates for PA Counties” (Attachment B of the PRP Instructions) for Centre County were then

applied for impervious developed and pervious developed. This table is attached as Appendix B.

The existing sediment loading quantified from the entire Planning Area is 101,741.75 lbs/yr,

phosphorous loading is 171.76 lbs/yr, and nitrogen loading is 3,007.38 lbs/yr. A more detailed

breakdown is located in Table 5 below. Please refer to Appendix D for supporting calculations.

Table 5: Existing Sediment Loading for Stormwater Outfalls to Sediment Impaired Streams

Pollutant Load

Receiving Water Land Use Area (ac) TN (lbs/yr) TP (lbs/yr)TSS [Sediment]

(lbs/yr)

Logan Branch/Chesapeake Bay

Impervious,Developed

43.09 827.76 99.97 76,339.54

Pervious, Developed 117.69 2,179.62 71.79 25,402.21TOTAL: 3,007.38 171.76 101,741.75

4.5 Proposed Best Management Practices (BMPs)

Spring Township proposed to meet the required pollutant load reductions for Logan Branch and the

Chesapeake Bay by implementing a basin retrofit project within the Planning Area in the

Steeplechase development during the five (5) year permit term. Proposed BMPs should be located

within or downstream of the 2010 Urbanized Area boundary.

This BMP was identified by analyzing the most fiscally responsible solution that will provide a water

quality improvement and real-world benefit, while meeting the mandated pollutant reduction

requirements. This analysis was performed in ArcMap 10.5 using aerial imagery, two (2)-foot

topographic contours, and hydrologic data. Site visits were conducted to verify project viability and

collect information and measurements of existing BMPs where applicable.

As there were no opportunities with projects in the planning/design phase or with existing BMPs on

Township-owned property within the Planning Area, BMP retrofits on private property were assessed

for retrofit. The Steeplechase Basin Retrofit project treats a large drainage area and reduces the

number of BMPs to be implemented.

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Pollutant reductions resulting from the proposed BMPs were quantified using the same methodology

stated above for existing sediment loading with the drainage area for each BMP, then applying

reduction rates. Reductions from retrofits of existing BMPs were calculated using the methodology in

the “Recommendations of the Expert Panel to Define Removal Rates for Urban Stormwater Retrofit

Projects” (revised January 20, 2015). Please refer to Appendix C for supporting calculations.

Sediment and nutrient load reductions achieved through the proposed implementation of the

Steeplechase Basin Retrofit are located Table 6 below. A total sediment reduction of 13 percent,

total phosphorous reduction of 14 percent, and a total nitrogen reduction of 14 percent have been

achieved, exceeding the minimum required reductions of 10 percent, 5 percent, and 3 percent,

respectively.

Table 6: Pollutant Load Reductions from Proposed BMPs

BMPName

DrainageArea(ac)

TSS Reduction TP Reduction TN Reduction

lbs/yr %% of

RequiredReduction

lbs/yr %% of

RequiredReduction

Lbs/yr %% of

RequiredReduction

SteeplechaseBasin Retrofit

82.21 13,581.41 13 133 23.86 14 277429.07

14 475

The scope of the proposed BMP is described in more detail below.

Steeplechase Basin Retrofit

This BMP consists of the retrofit of an existing basin at the entrance of the Steeplechase

development, on the south side of Steeplechase Drive, near the intersection of Axemann Road. The

drainage area to this basin is 82.21 acres. A steel plate will be installed over the current orifice,

effectively reducing the orifice size to six (6) inches, to promote infiltration and extended detention,

increasing water quality benefits. The ownership of the basin is currently in the process of being

converted from the developer to the Steeplechase Homeowners Association (HOA).

4.6 Funding Mechanisms

The funding mechanisms and estimated costs for the implementation of the proposed BMP are

included in Table 7. The costs provided are conceptual, to be utilized for preliminary planning

purposes only, and subject to change.

Table 7: Proposed BMP Funding Mechanisms

Proposed BMP Property OwnerFunding

MechanismEstimated

Design Cost1

EstimatedConstruction

Cost2

Total EstimatedCost

SteeplechaseBasin Retrofit

SteeplechaseDeveloper/HOA

Spring Township $3,500 $2,500 $6,000

1Estimated Design Cost includes survey, design, engineering, any anticipated permitting, bid administration, andconstruction inspection. Developed based on 2017 costs/rates.

2Estimated Construction Cost includes construction, materials, and as-built survey. Developed based on 2017costs/rates. It does NOT include costs associated with operations and maintenance (O&M).

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4.7 Operations and Maintenance

To ensure the long-term effectiveness of these proposed BMPs, operation and maintenance (O&M)

is crucial. The chart below (Table 8) outlines the responsible party and the necessary O&M practices

required for each proposed BMP (Pennsylvania Stormwater BMP Manual, December 30, 2006).

Table 8: Proposed BMP O&M Responsibilities

BMP OwnerResponsible Party for

O&MO&M Responsibilities

Steeplechase BasinRetrofit



Inspect at least 2x per year Clean inlets at least 2x per

year Maintain vegetation Remove invasive species Prohibit vehicular access Avoid excessive compaction by

mowers Drain-down time < 72 hours Mow as appropriate (remove

clippings) Remove accumulated

sediment

5.0 Conclusion

The required ten (10) percent sediment, five (5) percent phosphorous, and three (3) percent nitrogen

reductions have been achieved through the proposed implementation of one (1) basin retrofit project

at the entrance to the Steeplechase development. This BMP will be implemented by March 15, 2023.

9

6.0 Definitions

Best Management Practices (BMPs): Schedules of activities, prohibitions of practices, structural

controls (e.g., infiltration trenches), design criteria, maintenance procedures, and other management

practices to prevent or reduce pollution to the waters of the Commonwealth. BMPs include Erosion

and Sedimentation Control Plans, Post Construction Stormwater Management Plans, MS4 TMDL

Plans, Stormwater Management Act Plans, and other treatment requirements, operating procedures

and practices to control runoff, spillage or leaks, sludge or waste disposal, drainage from raw material

storage, and methods to reduce pollution, to recharge groundwater, to enhance stream base flow

and to reduce the threat of flooding and stream bank erosion. [NPDES Stormwater Discharges from

Small MS4s General Permit 5/2016 (PAG-13)]

Municipal Separate Storm Sewer System (MS4): All separate storm sewers that are defined as “large”

or “medium” or “small” municipal separate storm sewer systems pursuant to 40 CFR §§

122.26(b)(18), or designated as regulated under 40 CFR § 122.26(a)(1)(v). [PAG-13]

National Pollutant Discharge Elimination System (NPDES): A permit issued under 25 Pa. Code

Chapter 92a (relating to National Pollutant Discharge Elimination System permitting, monitoring and

compliance) for the discharge or potential discharge of pollutants from a point source to surface

waters. [PAG-13]

Outfall: A “Point Source” as defined by 40 CFR § 122.2 is the point where an MS4 discharges

stormwater to other surface waters of this Commonwealth. This does not include open conveyances

connecting two municipal separate storm sewers, or pipes, tunnels or other conveyances which

connect segments of the same stream and are used to convey waters of the Commonwealth (40 CFR

§ 122.26 (b) (9)). [PAG-13]

Owner or operator: The owner or operator of any “facility” or “activity” subject to regulation under the

NPDES program. [PAG-13]’

Parsing: A process in which land area is removed from a Planning Area in order to calculate the

actual or target pollutant loads that are applicable to an MS4. [NPDES from Small MS4 PRP

Instructions- Attachment A]

Planning Area: All of the storm sewersheds that an MS4 must calculate existing loads and plan load

reductions for. [NPDES from Small MS4 PRP Instructions]

Pollutant: Any contaminant or other alteration of the physical, chemical, biological, or radiological

integrity of surface water which causes or has the potential to cause pollution as defined in section

1 of The Clean Streams Law, 35 P.S. § 691.1. [PAG-13]

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Storm Sewershed: The catchment area that drains into the storm sewer system based on the surface

topography in the area served by the storm sewer. (Source: NPDES Stormwater Discharges from

Small MS4s General Permit [PAG-13]

Stormwater: Runoff from precipitation, snow melt runoff and surface runoff and drainage.

“Stormwater” has the same meaning as “Storm Water.” (Source: NPDES Stormwater Discharges from

Small MS4s General Permit [PAG-13]

Urbanized Area (UA): Land area comprising one or more places (central place(s)) and the adjacent

densely settled surrounding area (urban fringe) that together have a residential population of at least

50,000 and an overall population density of at least 1,000 people per square mile, as defined by the

United States Bureau of the Census and as determined by the latest available decennial census. The

UA outlines the extent of automatically regulated areas. UA maps are available at:

http://www.epa.gov/npdes/stormwater/urbanmaps,

or at: http://www.epa.gov/enviro/html/em/index.html. [PAG-13]

Appendix A

Public Comment and Responses

Appendix B

Developed Land Loading Rates for PA Counties

Appendix C

Supporting Calculations

MUNICIPALITY: Spring Township

RECEIVING WATERS: Logan Branch/Chesapeake Bay

COUNTY: Centre

Developed Land:

Land Use1 Area (ac) % Impervious2 Impervious Area (ac) Pervious Area (ac)

Developed, Open Space 57.73 19 10.97 46.76

Developed, Low Intensity 63.65 49 31.19 32.46

Developed, Medium Intensity 1.18 79 0.93 0.25

Developed, High Intensity 100

Hay/Pasture 14.09 0 14.09

Cultivated Crops 6.85 0 6.85

Decidous Forest 17.28 0 17.28

Total 160.78 43.09 117.69

Conversion from NLCD 2011 Land Use Designation to Impervious and Pervious Areas

1. NLCD 2011 Land Use and Areas

2. Highest % of impervious used from each NLCD 2011 definition per PADEP

CEDARVILLE Engineering Group, LLCSustaining Communities by Design



COUNTY: Centre

Developed Land:

Land Use Area (ac)

TN

(lbs/ac/yr)

TP

(lbs/ac/yr)

TSS [Sediment]

(lbs/ac/yr) TN (lbs/yr) TP (lbs/yr)

TSS [Sediment]

(lbs/yr)

Impervious,Developed 43.09 19.21 2.32 1,771.63 827.76 99.97 76339.54

Pervious, Developed 117.69 18.52 0.61 215.84 2179.62 71.79 25402.21

3,007.38 171.76 101,741.75

Existing Loads using PRP Loading Rates

Pollutant Loading Rates1 Pollutant Load

Logan Branch Total Pollutant Load


BMP NAME: Steeplechase Basin Retrofit



COUNTY: Center

RETROFIT CLASS: Existing BMP Conversion

LOCATION: Axemann Rd and Steeplechase Dr

GPS LOCATION: Lat: 40.8725/ Long: -77.7584

TOTAL DRAINAGE AREA TREATED (ac): 82.21

TYPE OF BMP: Ex. Surface Basin to be retrofitted with Outlet Structure Modification

CLASSIFICATION OF BMPs BASED ON RUNOFF REDUCTION CAPABILITY: Runoff Reduction Practice (RR)

Amount of Runoff Volume treated (in) = RS x 12 where:

IA RS = Runoff Storage Volume (ac-ft)

IA = Impervious Area (ac)

Impervious area treated (ac) Runoff Storage Volume (ac-ft)

Amount of Runof Volume

treated (in) TN (%) TP (%)

TSS [Sediment]

(%)

14.27 0.277 0.233 28 32 34

Pollutant Load to Steeplechase Basin Retrofit:

Land Use Area (ac) TN (lbs/ac/yr)

TP

(lbs/ac/yr)

TSS

[Sediment]

(lbs/ac/yr) TN (lbs/yr)

TP

(lbs/yr)

TSS

[Sediment]

(lbs/yr)

Impervious,Developed 14.27 19.21 2.32 1,771.63 274.13 33.11 25281.16

Pervious, Developed 67.94 18.52 0.61 215.84 1258.25 41.44 14664.17

Total 1,532.38 74.55 39,945.33

TN (lbs/yr) TP (lbs/yr)

TSS

[Sediment]

(lbs/yr)

429.07 23.86 13581.41Pollutant Load reduced with Steeplechase Basin Retrofit:

Note: It was assumed that the since the basin was dry even with no low flow orifice, the soils beneath the basin have naturally good infiltration rate and do not require an infiltration bed. The basin outlet structure must

be modified to detain runoff from the stormwater quality design storm for extended periods. Since the 13" orifice is a very big for water quality improvements, we will be suggesting to reduce the size of the orifice to 6"

by utilizing a steel plate. Furthermore, water quality benefits were assumed minimal as the basin was only designed for peak flow control, the existing basin has zero removal rate.

Efficiency Rates for Stormwater Retrofit Projects using Cheasapeake Bay Panel Report

Projected Removal Rates

Pollutant Pollutant Load




COUNTY: Centre


TSS

[Sediment]

(lbs/yr)

Steeplechase BMP Conversion 82.21 429.07 23.86 13581.41

Total 82.21 429.07 23.86 13,581.41


TSS

[Sediment]

(lbs/yr) TN (lbs/yr) TP (lbs/yr)

TSS [Sediment]

(lbs/yr) TN TP

TSS

[Sediment]

Logan Branch/Chesapeake Bay 160.78 3010.00 171.91 101,834.20 2580.93 148.05 88252.79 14% 14% 13%

Total 160.78 3,010.00 171.91 101,834.20 2,580.93 148.05 88,252.79 14% 14% 13%

Pollutant Load Reduction by BMPs

BMP Name BMP Drainage Area (ac)

Pollutant Reduction by BMPs

Receiving Waters Storm sewershed Area (ac)

Existing Pollutant without BMPs Pollutant Load with BMPs % Reduction


Appendix E

Proposed BMP Map

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DISCLAIMER:This product is for informational purposes and may not have been prepared for, or be suitable for legal, engineering, or surveying purposes. Users of thisinformation should review or consult the primary dataand information sources to ascertain the usability ofthe information.

Spring Township,Centre County,

PennsylvaniaCEDARVILLEEngineering Group, LLC

POLLUTANT REDUCTION PLANPROPOSED BMP

Steeplechase Basin Retrofit

MAP UPDATED: JUNE 2017

1 inch = 300 feet

Legend#VMS4 Outfalls

Proposed BMPsDrainage AreaStorm Sewersheds/Planning Area

Stormw ater Structures") Inlet, Township!( Manhole, TownshipW Inflow, Tow nshipXWOutflow, Township") Inlet, State!( Manhole, StateW Inflow, StateXWOutflow, State") Inlet, Private!H Riser, PrivateW Inflow, PrivateXWOutflow, PrivateStormw ater Conveyances

Pipe, TownshipSwale, Tow nshipPipe, StatePipe, PrivateSwale, PrivateImpaired StreamsNon-Impaired Streams

RoadsTownshipPENNDOTPrivateIndex ContoursParcelsTow nship Boundary

NOTES:

1. Drainage area to the proposedBMP equals the storm sewershed/planning area.

2. Property Owners: -Steeplechase HOA 13-529

Appendix F

Storm Sewershed/Land Cover Map

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Source: Esri, DigitalGlobe, GeoEye, Earthstar Geographics, CNES/Airbus DS, USDA, USGS, AEX, Getmapping, Aerogrid, IGN, IGP, swisstopo, and the GIS User Community

®

SPRIN

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1 inch = 400 feet

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0 390195Feet

NOTES:1. Land cover data is derivedfrom the National Land CoverDatabase 2011 (NLCD 2011).

DISCLAIMER:This product is for informational purposes and may not have been prepared for, or be suitable for legal, engineering, or surveying purposes. Users of this information should review or consult the primary data and information sources toascertain the usability of the information.

Legend_̂Proposed BMP

#VMS4 OutfallsStorm Sewersheds/Planning Area

Land Cover21- De veloped, Open Space22- De veloped, Low Intensity23- De veloped, Medium Intensity41- De ciduous F ore st81- Hay/Pasture82- Cultivated Crops

Stormwater Structures") Inlet, Tow nship!( Manhole, Tow nshipW Inflow, TownshipXWOutflow, Township") Inlet, State!( Manhole, StateW Inflow, StateXWOutflow, Stat e") Inlet, Private!H Riser, Pr ivateW Inflow, Pr iva teXWOutflow, PrivateStormwater Conveyances

Pipe, Tow nshipSwa le, Tow nshipPipe, StatePipe, PrivateSwa le, Private

RoadsTow nshipPENNDOTPrivateImpaired StreamsNon-Impaired StreamsIndex ContoursExisting BMPsParcels2010 U rba nize d AreaTow nship Boundary

2010URBANIZED AREA

PROPOSED BMP

DEP MS4 AGGREGATED REQUIREMENTS TABLE

Documents

Pollutant Reduction Plan - Spring Township€¦ · Pollutants of Concern, Existing Sediment Loading, Proposed Best Management Practices (BMPs), Funding Mechanisms, and Operations