TOWAMENCIN TOWNSHIP

PROPOSED TMDL STRATEGY PLAN MODIFICATIONS

DECEMBER 2015

TOWAMENCIN TOWNSHIPTMDL Strategy Plan TimelineEPA/PADEP MS4 Permitting Program started in 2003

Skippack Creek Watershed Total Maximum Daily Load (TMDL) was established in 2005

Establishing TMDL would have a significant impact on MS4 Permitting Program requirements, starting in 2012.

A Waste Load Allocation (WLA) of 11,099,483 pounds per year of Sediment Removal was assigned to the watershed

Towamencin Townships WLA was determined to be 2,446,075 lbs/year

Original TMDL Strategy Plan was submitted in September, 2012

Comments received from PADEP dated February 26, 2015Revised Parsing AnalysisOriginal Parsing Plan from NOI - 2012

Only Township Roads and Township Property in Urbanized Area IncludedArea of MS4 Responsibility = 1.047 sq. mi.

Revised Parsing Plan - 2015All areas draining to or from Township Roads & Properties in Urbanized Areas IncludedArea of MS4 Responsibility = 5.725 sq. mi.

Updated Sediment Reduction RequirementsWaste Load Allocation (WLA) from Original NOI

Updated Waste Load Allocation (WLA)

Proposed Sediment Reduction ProjectsHigh Efficiency Street Sweeping

Towamencin Creek InterceptorStreambank Stabilization

Kriebel Road InterceptorStreambank Stabilization

Conversion of Township Property from Maintained to Naturalized Areas

From lawn or farmland to meadowMeadow Conversion Properties

Proposed TMDL Strategy PlanImplementation ScheduleYear to be CompletedProposed ProjectEstimated Sediment Reduction (lbs./year)2008Towamencin Township Pool1,4242014Stormwater Management Ordinance was amended to include BMPs and Low Impact DevelopmentN/A2015Streambank Stabilization as part of Towamencin Creek Interceptor Improvement Project13,2442016Removing Sediment from Inlets4122016Removing Sediment from Roads with Street Sweeping with High-Efficiency Sweeper6,5332016Conversion of Township/Authority Properties from lawn or cropland to meadow28,0182016Review of Stormwater Management Ordinance and Township Engineering Standards to determine if additional revisions can be made to increase the sediment reduction for new projectsN/A2014-2019Reduction of Sediment Anticipated from New Land Development Projects since the Adoption of the revised Stormwater Management Ordinance1,8242017Streambank Stabilization as part of Kreibel Road Trail and Sanitary Sewer Interceptor Improvement Project23,650Total75,105 lbs./yearNEXT STEPSRespond to any Public or Supervisor Comments

Finalize Proposed TMDL Strategy as required by PA DEP

Response to PA DEP NOI Comments due December 31, 2015 with updated TMDL Strategy

Continue to coordinate with Montgomery County Stormwater Coalition and Skippack Creek Watershed Committee to develop potential Regional approach to address MS4 Permitting Program RequirementsQUESTIONS?Sheet1WLA for TSS for Towamencin Township within the Skippack Creek WatershedCover ConditionsCurrent Load (lbs/year)WLA (lbs/year)Reduction (lbs/year)

Hay/Pasture21,162Cropland586,692Coniferous Forest548Mixed Forest694Deciduous Forest1,356Upaved Road1,048Transitional326,136Low Intensity Development59,521High Intensity Development8,222Stream Bank10,094,104

WLA for Towamencin Township13,545,558.0011,099,4832,446,075WLA for Urbanized Area in Towamencin Township2,092,121Area of Skippack Creek Watershed in Towamencin Township9.675sq.mi.Area of Skippack Creek Watershed in Towamencin Urbanized Area8.275sq.mi.Areas Outside of MS4 Drainge Area2.55sq.mi.Area within MS4 Drainage Area5.725sq.mi.% of MS4 Drainage Area within Urbanized Area in Towamencin Township69%% applied to required reduction (lbs/year)1,447,419lbs/yearvs. 310,648 lbs/year

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