2-Stormwater Basin Retrofits Stillmeadow HOA - (Phase I) - PCSM.pdf

PDF 13 MB Posted Sep 19, 2025

Attached to: 2026 Street Maintenance and Materials
Solicitation number: Not on record
Issued by: York County, Mcconnellsburg Borough, Pennsylvania

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Written by GovTribe AI · Sep 22, 2025

This document is a Post-Construction Stormwater Management Plan for Stormwater Basin Retrofits for the Stillmeadow Homeowners Association (HOA) in Manchester Township, York County, Pennsylvania. The project involves retrofitting six existing stormwater basins (Basins 1-6) with improvements to their outlet structures, regrading, and environmental restoration. The plan, prepared by Land Logic Group for Manchester Township, details specific construction sequencing, including repair and modification of existing outlet structures, installation of anti-seep collars, regrading of basin berm areas, and swale improvements. The project includes landscape restoration using native seed mixes, with specific seeding schedules for meadow and stormwater basin areas.

The project scope includes retrofitting basins to function as infiltration basins, with detailed engineering specifications for outlet structure modifications, pipe repairs, and erosion control measures. The plan provides comprehensive technical details for each basin, including elevation profiles, outlet structure configurations, and cross-sections. Specific technical elements include installing concrete anti-seep collars, repairing existing pipes, and implementing native vegetation strategies. The design incorporates environmental considerations such as using native wildflower and grass mixes, and includes detailed erosion control and stormwater management techniques to improve the hydraulic performance of the existing stormwater infrastructure while enhancing ecological restoration of the site.

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COVER PAGE AND

LOCATION MAP

STORMWATER BASIN MAINTENANCE SCHEDULE

INSPECTION AND MAINTENANCE ACTIVITYFREQUENCY REMEDIATION OPTIONS

VEGETATED SWALE MAINTENANCE SCHEDULE

INSPECTION AND MAINTENANCE ACTIVITYFREQUENCY REMEDIATION OPTIONS

REQUIRED CONSTRUCTION INSPECTION SCHEDULES FOR SWM BMPS

THERMAL IMPACTS

Date

10/30/2024

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Sheet Title

Drawing Scale

Design By

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Project Manager

SBH

Project No.

2023001

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T H

C I E N

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N.T.S.

PCSM1-01

SEEDING RESTORATION TABLE

STORMWATER BASIN RETROFITS - STILLMEADOW HOA

MANCHESTER TOWNSHIP, YORK COUNTY

POST-CONSTRUCTION STORMWATER MANAGEMENT PLAN

FOR

POST CONSTRUCTION STORMWATER MANAGEMENT NOTES

SHEET INDEX

CONSTRUCTION SEQUENCING

BOLD

STAGE 1

STAGE 2

2.1 BASIN 5 RETROFIT CONSTRUCTION SEQUENCE

2.1.3 CRITICAL STAGE - IN ACCORDANCE WITH PCSM PLANS, CONTRACTOR SHALL REPAIR AND/OR MODIFY THE EXISTING OUTLET STRUCTURE ALONG WITH THE REPAIR OR REPLACEMENT OF DISCHARGE PIPING. THE INSTALLATION OF ANTI-SEEP COLLARS AND THE REGRADING AND FORMING OF BASIN BERM AREAS. NO NEW STRUCTURES ARE TO BE INSTALLED IN THE BASINS.THE OUTLET STRUCTURE WORKS SHALL BE REPAIRED OR

MODIFIED AS FOLLOWS:

2.2 BASIN 3 AREA CONSTRUCTION SEQUENCE

2.2.3 CRITICAL STAGE - GRADE SWALES S-1a AND S-1b AS SHOWN INTEGRAL WITH THE REGRADING OF THE EXISTING BASIN 3 AREA AND INSTALL CHANNEL LINER. PROVIDE IMMEDIATE STABILIZATION OF GRADING/CHANNELS

UPSLOPE OF EXISTING BASIN 2.

2.3 BASIN 2 RETROFIT CONSTRUCTION SEQUENCE

2.3.3 CRITICAL STAGE - CONTRACTOR SHALL REPAIR AND/OR MODIFY THE EXISTING OUTLET STRUCTURE IN ACCORDANCE WITH DETAILED PCSM PLANS. THE OUTLET STRUCTURE WORKS SHALL BE REPAIRED OR MODIFIED

AS FOLLOWS:

CONSTRUCTION SEQUENCING (CONT.)

2.4 BASIN 4 OUTLET STRUCTURE

CRITICAL STAGE - CONTRACTOR SHALL REPAIR THE EXISTING OUTLET STRUCTURE IN ACCORDANCE WITH DETAILED PCSM PLAN ALONG WITH THE REPAIR OF DISCHARGE PIPING, THE INSTALLATION OF ANTI-SEEP COLLARS AND THE REGRADING AND FORMING OF BASIN BERM AREAS. THE OUTLET STRUCTURE FOR BASIN 4 SHALL BE REPAIRED AS

FOLLOWS:

2.5 BASIN 6 OUTLET STRUCTURE

CRITICAL STAGE - CONTRACTOR SHALL REPAIR THE EXISTING OUTLET STRUCTURE IN ACCORDANCE WITH DETAILED PCSM PLANS ALONG WITH THE REPAIR OF DISCHARGE PIPING AND THE REGRADING AND FORMING OF BASIN BERM

AREAS. THE OUTLET STRUCTURE FOR BASIN 6 SHALL BE REPAIRED AS FOLLOWS:

2.6 BASIN 1 RETROFIT CONSTRUCTION SEQUENCE

2.7 MULTI-PURPOSE TRAIL INSTALLATION

STAGE 3

STAGE 4

STORMWATER MANAGEMENT OWNERSHIP, OPERATIONS, AND

MAINTENANCE SCHEDULE

NATIVE MEADOW

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P M

LEA DRIVE

OLMSTEAD WAY

BASIN 5

BASIN 6

SWALE S-2

Q10=8.50 CFS

SWALE S-3

Q10=6.00 CFS

Basin 2 Section

BMP: 002 (Basin 5) Retrofit as Infiltration Basin (6.4.2)

To POA: 001 Area: 31.344 Ac.

S-2

S-3

ESC Limit of DisturbanceESC Limit of Disturbance

431 432

433 434

430 42

RETROFIT OUTLET

STRUCTURE; REPAIR AS NEEDED

(SEE DETAILS SHEETS C1-11 & C1-13)

SWALE S-2

SWALE S-3

MATCH LINE - SHEET PCSM-03

GRAPHIC SCALE

SCALE: 1"=

30' 15' 30'

30'

POST-CONSTRUCTION

STORMWATER

MANAGEMENT PLAN SITE

PLAN (NORTH)

Adjoiner Property Line

Single White Line (4") Double Yellow Line (4") Dashed White Line (4")

Soils Type Line (Approx.)

Stream/Pond

EXISTING LINETYPE LEGEND

Pavement Edge

Fence

Underground Sewer Line

Overhead Utility Line

Underground Storm Line

Property Line

Right-of-Way Line

5ft. Contour Interval 1ft. Contour Interval

Underground Gas Line

Easement Line Right-of-Way Centerline

Underground Electric

Tree Line

Curb Line Edge of Stone or Gravel

Building

Sanitary Sewer Manhole

Sign

Guy Wire Utility Pole Deciduous Tree Ground Elevation

Light Pole Electric Box

EXISTING SYMBOL LEGEND

Underground Gas Line (Abandoned)

Storm Inlet Endwall/Headwall

Date

10/30/2024

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Sheet Title

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Project No.

2023001

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1" = 30'

PCSM1-02

PCSM PLAN LINETYPE LEGEND

Proposed Contours Limit of Disturbance (LOD)

Proposed Storm Drain

NPDES Permit Boundary

PCSM PLAN SEEDING SCHEDULE

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LANDSCAPE RESTORATION MEADOW:

SEED WITH ERNST CONSERVATION SEEDS SHOWY

NORTHEAST NATIVE WILDFLOWER & GRASS MIX

(ERNMX-153) AT A RATE OF 15 LBS/ACRE.

SEE DETAIL SHEET ESC1-09

STORMWATER BMP SEED MIX:

SEED WITH ERNST CONSERVATION SEEDS NATIVE

DETENTION AREA MIX (ERNMX-178) AT A RATE OF 20

LBS/ACRE

SEE DETAIL SHEET ESC1-09

STORMWATER BMP SEED MIX:

SEED WITH ERNST CONSERVATION SEEDS NATIVE

DETENTION AREA MIX (ERNMX-180) AT A RATE OF 20

LBS/ACRE

SEE DETAIL SHEET ESC1-09

STORMWATER BMP SEED MIX:

SEED WITH ERNST CONSERVATION SEEDS NATIVE

DETENTION AREA MIX (ERNMX-181) AT A RATE OF 60

LBS/ACRE OR 1.5 LBS/ 1000 S.F.

SEE DETAIL SHEET ESC1-09

Trail Centerline Swale

6+00

C U se r s\ m p a D r o p b o x C A D

P R O D U C T

N P la n

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LANE

GROUSE LANE

STILLMEADOW LANE

STILLMEADOW

BASIN 2

BASIN 4

BASIN 3

BASIN 1

TP(G)

02A

TP(G)

COLD

SPRIN

G R

OAD

BMP: 001 (Basin 2) Retrofit as Infiltration Basin (6.4.2)

To POA 001 Area: 6.480 Ac.

SWALE S-1a

Q10=12.00 CFS

SWALE S-1b

Q10=12.00 CFS

BMP: 003

Landscape Restoration (6.7.2)

To POA: 001 Area: 0.301 Ac.

Trib. To: BMP 001

S-1 a

S- 1b

DP 001/POA 001

Surface Water: UT to Codorus Creek Ch 93: WWF-MF

417418419

Limit of DisturbanceLimit of Disturbance

420420

SWALE S-1a

SWALE S-1b

MATCH LINE - SHEET PCSM-02

GRAPHIC SCALE

SCALE: 1"=

30' 15' 30'

30'

POST-CONSTRUCTION

STORMWATER

MANAGEMENT PLAN SITE

PLAN (SOUTH)

Date

10/30/2024

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Sheet Title

Drawing Scale

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MDJ & SBH

Project Manager

SBH

Project No.

2023001

Sheet No.

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I E N

I G

1" = 30'

PCSM1-03

Adjoiner Property Line

Single White Line (4") Double Yellow Line (4") Dashed White Line (4")

Soils Type Line (Approx.)

Stream/Pond

EXISTING LINETYPE LEGEND

Pavement Edge

Fence

Underground Sewer Line

Overhead Utility Line

Underground Storm Line

Property Line

Right-of-Way Line

5ft. Contour Interval 1ft. Contour Interval

Underground Gas Line

Easement Line Right-of-Way Centerline

Underground Electric

Tree Line

Curb Line Edge of Stone or Gravel

Building

Sanitary Sewer Manhole

Sign

Guy Wire Utility Pole Deciduous Tree Ground Elevation

Light Pole Electric Box

EXISTING SYMBOL LEGEND

Underground Gas Line (Abandoned)

Storm Inlet Endwall/Headwall

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M1 -03

PCSM PLAN SEEDING SCHEDULE

LANDSCAPE RESTORATION MEADOW:

SEED WITH ERNST CONSERVATION SEEDS SHOWY

NORTHEAST NATIVE WILDFLOWER & GRASS MIX

(ERNMX-153) AT A RATE OF 15 LBS/ACRE.

SEE DETAIL SHEET ESC1-09

STORMWATER BMP SEED MIX:

SEED WITH ERNST CONSERVATION SEEDS NATIVE

DETENTION AREA MIX (ERNMX-178) AT A RATE OF 20

LBS/ACRE

SEE DETAIL SHEET ESC1-09

STORMWATER BMP SEED MIX:

SEED WITH ERNST CONSERVATION SEEDS NATIVE

DETENTION AREA MIX (ERNMX-180) AT A RATE OF 20

LBS/ACRE

SEE DETAIL SHEET ESC1-09

STORMWATER BMP SEED MIX:

SEED WITH ERNST CONSERVATION SEEDS NATIVE

DETENTION AREA MIX (ERNMX-181) AT A RATE OF 60

LBS/ACRE OR 1.5 LBS/ 1000 S.F.

SEE DETAIL SHEET ESC1-09

PCSM PLAN LINETYPE LEGEND

Proposed Contours Limit of Disturbance (LOD)

Proposed Storm Drain

NPDES Permit Boundary

Trail Centerline Swale

6+00

CONTROL AREA

AREA NOT RECEIVE

BIOCHAR AMENDMENTS

C U se r s\ m p a D r o p b o x C A D

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POST-CONSTRUCTION

STORMWATER

MANAGEMENT DETAILS

NOT TO SCALE

STANDARD CONSTRUCTION DETAIL #9-2

RIPRAP APRON AT PIPE OUTLET

NO FLARED ENDWALL

NOTES:

ALL APRONS SHALL BE CONSTRUCTED TO THE DIMENSIONS SHOWN. TERMINAL WIDTHS SHALL BE ADJUSTED AS NECESSARY

TO MATCH RECEIVING CHANNELS.

ALL APRONS SHALL BE INSPECTED AT LEAST WEEKLY AND AFTER EACH RUNOFF EVENT. DISPLACED RIPRAP WITHIN THE

APRON SHALL BE REPLACED IMMEDIATELY.

EXTEND RIPRAP ON BACK SIDE OF APRON TO AT LEAST 1/2 DEPTH OF PIPE ON BOTH SIDES TO PREVENT SCOUR AROUND

THE PIPE.

OUTLET

NO.

PIPE

DIA

(IN)

RIPRAP APRON

SIZE

R-_

THICK.

(IN)

LENGTH

(FT)

INITIAL

WIDTH

Aiw

(FT)

TERMINA

WIDTH

Atw

(FT)

Culv1 12 4 18 8 3 12 Culv 2 15 x2 5 27 16 8 20 Culv 3 15 x2 5 27 16 8 20

At w

Ai w

1/2 Pd

Pd Pd

ORIGINAL GROUND

GEOTEXTILE

R t

0.00% GRADE

PLAN VIEW

SECTION A-A

Date

10/30/2024

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Project Manager

SBH

Project No.

2023001

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N.T.S.

PCSM1-04

NOT TO SCALE

STANDARD CONSTRUCTION DETAIL #9-1

RIPRAP APRON AT PIPE OUTLET

WITH FLARED END SECTION OR ENDWALL

NOTES:

ALL APRONS SHALL BE CONSTRUCTED TO THE DIMENSIONS SHOWN. TERMINAL WIDTHS SHALL BE ADJUSTED AS NECESSARY

TO MATCH RECEIVING CHANNELS.

ALL APRONS SHALL BE INSPECTED AT LEAST WEEKLY AND AFTER EACH RUNOFF EVENT. DISPLACED RIPRAP WITHIN THE

APRON SHALL BE REPLACED IMMEDIATELY.

0% SLOPE

PLAN VIEW

SECTION Y-Y

SECTION Z-Z

GEOTEXTILE

0% SLOPE

Atw

R t

Aiw Pd

Y Y

ROCK

SURFICIAL TREATMENT

SUITABLE STRUCTURAL FILL

GRAVEL (AASHTO #57 STONE)

RIP-RAP (2 TO 4 IN. DIA.)

RIP-RAP =

(6 TO 12 IN. DIA.)

FLOWABLE FILL/LEAN CONCRETE

LOW PERMEABILITY SOIL (CL OR ML)

TOPSOIL

ROCK

NOT TO SCALE

TYPICAL SINKHOLE STONE TYPE REPAIR DETAIL

NOT TO SCALE

TYPICAL SINKHOLE GROUTED REPAIR DETAIL

NOTE:

EXCAVATE TO ROCK IF POSSIBLE.

NOTE:

EXCAVATE TO ROCK IF POSSIBLE.

NOT TO SCALE

STANDARD CONSTRUCTION DETAIL #6-1

VEGETATED CHANNEL

SOIL BACKFILL

LONGITUDINAL

ANCHOR TRENCH

OVERLAP 6

IN. MIN.

OVERCUT CHANNEL 2 IN. TO

ALLOW BULKING DURING SEED

BED PREPARATION

EXCAVATE CHANNEL TO

DESIGN GRADE AND CROSS

SECTION

DESIGN

DEPTH

PREPARE SOIL AND APPLY SEED BEFORE

INSTALLING BLANKETS, MATS, OR OTHER

TEMPORARY CHANNEL LINER SYSTEM.

SHINGLE-LAP SPLICED ENDS OR BEGIN NEW ROLL IN

AN INTERMITTENT CHECK SLOT

MIN. SHINGLE LAP=6 IN.FL

O W

LINING *

* SEE MANUFACTURER'S LINING INSTALLATION DETAIL FOR STAPLE PATTERNS, VEGETATIVE STABILIZATION FOR SOIL

AMENDMENTS, SEED MIXTURES AND MULCHING INFORMATION

LONGITUDINAL

ANCHOR TRENCH

(LOOKING DOWNSTREAM)

ISOMETRIC VIEW

CHANNEL CROSS-SECTION

INTERMITTENT CHECK SLOT LONGITUDINAL ANCHOR TRENCH

NOTES:

ANCHOR TRENCHES SHALL BE INSTALLED AT BEGINNING AND END OF CHANNEL IN THE SAME MANNER AS LONGITUDINAL

ANCHOR TRENCHES.

CHANNEL DIMENSIONS SHALL BE CONSTANTLY MAINTAINED. CHANNEL SHALL BE CLEANED WHENEVER TOTAL CHANNEL

DEPTH IS REDUCED BY 25% AT ANY LOCATION.

SEDIMENT DEPOSITS SHALL BE REMOVED WITHIN 24 HOURS OF DISCOVERY OR AS SOON AS SOIL CONDITIONS PERMIT ACCESS TO CHANNEL WITHOUT FURTHER DAMAGE. DAMAGED LINING SHALL BE REPAIRED OR REPLACED WITHIN 48 HOURS

OF DISCOVERY.

NO MORE THAN ONE THIRD OF THE SHOOT (GRASS LEAF) SHALL BE REMOVED IN ANY MOWING. GRASS HEIGHT SHALL BE MAINTAINED BETWEEN 2 AND 3 INCHES UNLESS OTHERWISE SPECIFIED. EXCESS VEGETATION SHALL BE REMOVED FROM

PERMANENT CHANNELS TO ENSURE SUFFICIENT CHANNEL CAPACITY.

CHANNEL

NO.

BOTTOM

WIDTH

(FT)

DEPTH

(FT)

TOP

WIDTH

(FT)

(FT) LINING *

S-1a 4 1.5 13 3 3 Veg C on Tensar S75 S-1b 4 1.0 14 5 5 Veg C on Tensar P300 S-2 4 1.0 12 4 4 Veg C on Tensar S75 S-3 4 1.0 14 5 5 Veg C on Tensar S75

EROSION CONTROL BLANKET

STAPLE PATTERN 'D'

STAPLE PATTERN "D"

USE 3.4 STAPLES/YD^2 (4.1 STAPLES/m^2), 6x2x6 11 ga.

WIRE, "U" SHAPED STAPLES). LONGER STAPLES MAY

BE REQUIRED FOR LOOSE SOIL CONDITIONS.

LARGER GAUGE STAPLES MAY BE NEEDED OFR

COMPACTED OR ROCKY SOILS. SECURE R.E.C.P.S BY

PLACING STAPLES/STAKES USING THE NOTED

SPACING OR PLACING A STAPLE/STAKE THROUGH

EACH "X" SHOWN.

FLOW

6.67 FT. WIDE BLANKET (TYP.)

2.0'

1.6 FT.

NOT TO SCALE

OUTLET

NO.

PIPE

DIA

(IN)

RIPRAP APRON

SIZE

R-_

THICK.

(IN)

LENGTH

(FT)

INITIAL

WIDTH

Aiw

(FT)

TERMINAL

WIDTH

Atw

(FT)

RR-2B 21 4 18 12 5.5 18

RR-C1 12 4 18 8 3 12

RR-C2 2-12 3 9 6 6 6

RR-C3 2-12 3 9 6 6 6

NOT TO SCALE

STANDARD CONSTRUCTION DETAIL #11-1

EROSION CONTROL BLANKET INSTALLATION

NOTES:

SEED AND SOIL AMENDMENTS SHALL BE APPLIED ACCORDING TO THE RATES IN THE PLAN DRAWINGS PRIOR TO INSTALLING

THE BLANKET.

PROVIDE ANCHOR TRENCH AT TOE OF SLOPE IN SIMILAR FASHION AS AT TOP OF SLOPE.

SLOPE SURFACE SHALL BE FREE OF ROCKS, CLODS, STICKS, AND GRASS.

BLANKET SHALL HAVE GOOD CONTINUOUS CONTACT WITH UNDERLYING SOIL THROUGHOUT ENTIRE LENGTH. LAY BLANKET LOOSELY AND STAKE OR STAPLE TO MAINTAIN DIRECT CONTACT WITH SOIL. DO NOT STRETCH BLANKET.

THE BLANKET SHALL BE STAPLED IN ACCORDANCE WITH THE MANUFACTURER'S RECOMMENDATIONS.

BLANKETED AREAS SHALL BE INSPECTED WEEKLY AND AFTER EACH RUNOFF EVENT UNTIL PERENNIAL VEGETATION IS ESTABLISHED TO A MINIMUM UNIFORM 70% COVERAGE THROUGHOUT THE BLANKETED AREA. DAMAGED OR DISPLACED

BLANKETS SHALL BE RESTORED OR REPLACED WITHIN 4 CALENDAR DAYS.

BLANKET EDGES STAPLED

AND OVERLAPPED

(4 IN. MIN.)

INSTALL BEGINNING OF ROLL IN

6 IN. x 6 IN. ANCHOR TRENCH, STAPLE, BACKFILL AND

COMPACT SOIL

STARTING AT TOP OF SLOPE,

ROLL BLANKETS IN DIRECTION

OF WATER FLOW

PREPARE SEED BED

(INCLUDING APPLICATION OF LIME,

FERTILIZER AND SEED) PRIOR TO

BLANKET INSTALLATION

REFER TO MANUF. RECOMMENDED

STAPLING PATTERN FOR STEEPNESS

AND LENGTH OF SLOPE BEING

BLANKETED

THE BLANKET SHOULD

NOT BE STRETCHED; IT

MUST MAINTAIN GOOD

SOIL CONTACT

OVERLAP BLANKET ENDS 6 IN. MIN. WITH

THE UPSLOPE BLANKED OVERLYING THE

DOWNSLOPE BLANKET (SHINGLE STYLE).

STAPLE SECURELY.

NOT TO SCALE

STANDARD CONSTRUCTION DETAIL #9-3

RIPRAP APRON AT PIPE OUTLET TO AN EXISTING CHANNEL

OUTLET

NO.

PIPE

DIA

(IN)

RIPRAP APRON

SIZE

R-_

THICK.

(IN)

LENGTH

(FT)

INITIAL

BOTTOM

WIDTH

(AT ENDWALL)

(FT)

END

WIDTH

(FT)

INITIAL

TOP

WIDTH

(AT ENDWALL)

(FT)

END

TOP

WIDTH

(FT)

SIDE

SLOPES

H:V

RR-5A 30 5 27 20 4 4 8 14 4:1

RR-5B 18 4 18 10 2.5 2.5 8 10 3:1

FLOW

Pd Pd

R t

0.00% GRADE

18 IN.

MIN.

3 FT. MIN.

DEPTH

TOP OF

CHANNEL

DOWNSTREAM

CHANNEL INVERT

TOP OF RIPRAP

SLOPE POSITIVE TO

DRAIN

GEOTEXTILE

DISCHARGE TO

CONFINED CHANNEL

RIPRAP TO EXTEND TO

ANTICIPATED MAX. FLOW

DEPTH BASED ON DESIGN Q

FOR PIPE DISCHARGE

GEOTEXTILE

SIDE SLOPES TO VARY FROM 2:1

AT PIPE OUTLETS TO EXISTING

CHANNEL SIDE SLOPES AT END

OF APRON

PLAN VIEW

SECTION VIEW

SECTION A-A

NOTES:

ALL APRONS SHALL BE CONSTRUCTED TO THE DIMENSIONS SHOWN. TERMINAL WIDTHS SHALL BE ADJUSTED AS NECESSARY

TO MATCH RECEIVING CHANNELS.

ALL APRONS SHALL BE INSPECTED AT LEAST WEEKLY AND AFTER EACH RUNOFF EVENT. DISPLACED RIPRAP WITHIN THE

APRON SHALL BE REPLACED IMMEDIATELY.

Stone Headwall Construction

1. If necessary,excavate around the pipe end to make room for the wall. Walls typically extend 2-3 times the diameter of the pipe on each side of the pipe. The base of the wall should be level with, or lower than,the bottom of the pipe inlet.

2. Use rocks with flat sides in the face of the wall.

Use the largest available stones for the base course and slightly smaller stones in consecutive courses. Take care to stagger the joints and slightly cant the wall toward the road in each successive course. Periodically install a longer stone into the wall face with the long axis perpendicular to the face of the wall. Compact this“deadman” stone in to the wall backfill.

3. Backfill and compact behind the wall in layers as it is built. Use material that is damp enough for compaction and free of large root sand clumps of organic material.

4. Build the wall to the top of the pipe. Place a large capstone over the top of the pipe to bridge the two halves of the wall together and protect the pipe. If a large stone is unavailable,continue to build the wall to attain a stable span of smaller stone over the pipe, alternating the joints in the rock.

5. This detail was obtained from Penn State University, Center for Dirt and Gravel Road Studies.

PLAN VIEWS OF A NATURAL STACKED STONE ENDWALL. NOTE THAT THE BASE WIDTH SHOULD BE

EQUAL TO THE HEIGHT, THE FACE SHOULD BE SLOPED OR CANTED BACK, SEAMS SHOULD BE

OVERLAPPED LIKE BRICKS.

NOT TO SCALE

NATURAL STACKED STONE END WALL

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GROUSE LANE

BASIN 2

BASIN 4

BASIN 3

TP(G)

02A

TP(G)

COLD

SPRIN

G R

OAD

BMP: 001 (Basin 2) Retrofit as Infiltration Basin (6.4.2)

To POA 001 Area: 6.480 Ac.

SWALE S-1a

Q10=12.00 CFS

SWALE S-1b

Q10=12.00 CFS

BMP: 003

Landscape Restoration (6.7.2)

To POA: 001 Area: 0.301 Ac.

Trib. To: BMP 001

S-1 a

S- 1b

418419

Limit of DisturbanceLimit of Disturbance

417.62

417.98

417.88

418.31

418.05

417.53

424.08

423.60 423.48

423.90

423.80

423.85

2.00%

2.0 0%

1.65%

1.47%

5.0 9%

5.1 5%

417.62

417.70

1.34%

420420

SWALE S-1a

SWALE S-1b

1" = 20' H 1" = 4' V

Basin 2 Section

0+2

1+2

Date

10/30/2024

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Sheet Title

Drawing Scale

Design By

MDJ & SBH

Project Manager

SBH

Project No.

2023001

Sheet No.

SS M

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ING

/ AS

SET

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4t h St

C am p H ill, P

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.4 w w w .la nd lo gi cs gr ou p.

co m

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H ar te ch

E ng in ee ri ng

C on su lt in g, L

C ha rlt on W ay M ec ha ni cs bu rg

, P A

) 9

-0

) 8

-1

I E N

I G

N.T.S.

PCSM1-05

GRAPHIC SCALE

SCALE: 1"=

20' 10' 20'

20'

50Y

100Y

10Y

415.70

420.58

421.58

2Y 417.86

420.54 421.60

421.88

FRONT ELEVATION

PLAN VIEW

SIDE/SECTION VIEW

ISOMETRIC VIEW

SCENARIO C.2

BASIN 2 OUTLET STRUCTURE

EXIST. 18" Ø CMP

RELEASE OUTLET

RETROFIT

(SEE DETAILS)

EX. 18" Ø CMP

415.70

421.70 Em. Splwy

422.20± Top Berm

Xrefs: C:\Users\mpa\Dropbox\CAD PRODUCTION\HOA_Design_20250510.dwg C:\Users\mpa\Dropbox\CAD PRODUCTION\XR-BaseMap_20250510.dwg C:\Users\mpa\Dropbox\CAD PRODUCTION\XR-C3D_Design_20250510.dwg

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STORMWATER

MANAGEMENT

BASIN 2 RETROFIT DETAILS

NOT TO SCALE

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BASIN 5

TP(G)

Q10=8.50 CFS

Basin 2 Section

S-2

431 432

RETROFIT OUTLET

STRUCTURE; REPAIR AS NEEDED

(SEE DETAILS SHEETS C1-11 & C1-13)

SWALE S-2

1" = 20' H 1" = 4' V

Basin 5 Diverted Pipe Profile

1+2

1" = 20' H 1" = 4' V

Basin 5 Section

0+2

1+2

Date

10/30/2024

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Drawing Scale

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Project Manager

SBH

Project No.

2023001

Sheet No.

SS M

APP

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/ AS

SET

GEM

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4t h St

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-0

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I E N

I G

N.T.S.

PCSM1-06

GRAPHIC SCALE

SCALE: 1"=

10' 5' 10'

10'

50Y

100Y

10Y

429.80

434.70

435.20

2Y 431.98

433.55 434.55

434.99

FRONT ELEVATION

PLAN VIEW

SIDE/SECTION VIEW

ISOMETRIC VIEW

NOT TO SCALE

SCENARIO C.2

BASIN 5 OUTLET STRUCTURE

430.60

30" HDPE

LINER PIPE

TO BASIN 4

18" HDPE

DIVERTER

PIPE TO

BASIN 2

4" CIP

DIVERT

WEIR

PLUGGED

EX. 16" Ø

ORIFICE

W/PLATE

EX. 30"

WEIR

30" HDPE

LINER PIPE

EX. 42"Ø

CMP

429.80

430.31

18" HDPE

DIVERTER

PIPE TO

BASIN 2

432.80

4" CIP

DIVERT

WEIR 435.60 Em. Splwy 436.10± Top Berm

REMOVE THIS SECTION OF

STRUCTURE

18"Ø HDPE DIVERTER

PIPE TO BASIN 2

Xrefs: C:\Users\mpa\Dropbox\CAD PRODUCTION\HOA_Design_20250510.dwg C:\Users\mpa\Dropbox\CAD PRODUCTION\XR-BaseMap_20250510.dwg C:\Users\mpa\Dropbox\CAD PRODUCTION\XR-C3D_Design_20250510.dwg

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STORMWATER

MANAGEMENT

BASIN 5 RETROFIT DETAILS

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Sheet Title

Drawing Scale

Design By

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Project Manager

SBH

Project No.

2023001

Sheet No.

SS M

APP

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PCSM1-07

POST-CONSTRUCTION

STORMWATER MANAGEMENT

GENERAL BASIN RETROFIT

DETAILS

50Y

100Y

10Y

415.70

420.47

421.47

2Y 416.68

417.96 420.83

421.43

FRONT ELEVATION

PLAN VIEW

SIDE/SECTION VIEW

ISOMETRIC VIEW

Not-to-Scale

SCENARIO C.2

BASIN 4 OUTLET STRUCTURE

EXIST. 36" Ø CMP

RELEASE OUTLET

RETROFIT

(SEE DETAILS)

EX. 36"Ø CMP

415.70

421.60 Em. Splwy

422.10± Top Berm

14" STAINLESS STEEL

ORIFICE PLATE

CONTROL ORIFICE

INVERT

4" Ø STAINLESS STEEL

MOUNTING BOLTS

2"MIN.

1"X1"X1

4" STEEL FRAME

STAINLESS STEEL

ORIFICE PLATE

CONTROL ORIFICE(S)

#4 BARS PAINTED

WITH RUST

INHIBITOR

RELEASE OUTLET RETROFIT DETAILS

NOT TO SCALE

OUTLET STRUCTURE NOTES:

1. ALL OUTLET STRUCTURE CONTROLS (ORIFICES AND WEIRS) ARE INTENDED TO BE CONSTRUCTED IN A MANNER SYMMETRICAL ABOUT THE CENTERLINE OF THE RISER BOX FACE TO BE INSTALLED.

RETROFITTED STRUCTURES

1. BOX STRUCTURES TO BE RECONFIGURED SHALL HAVE NEW OPENINGS BY SAWCUTTING HOLES AS SHOWN ON DETAILS. OPENINGS SHALL NOT BE FORMED BY HAMMER AND CHISEL. EXPOSED NEW CONCRETE EDGES AND REINFORCEMENT STEEL SHALL BE PAINTED WITH TAR OR MASTIC TO PREVENT WATER DAMAGE.

2. OPENING DIMENSIONS SHALL NOT BE CUT OR FORMED BELOW EXISTING BOX FLOOR OR EXISTING ORIFICE OPENING. PLATE IS DESIGNED TO OVERLAP HOLE OPENING BY 2 INCHES ON ALL SIDES

3. CONTROL STRUCTURE PLATES SHALL BE MOUNTED TO THE RISER BOX USING A WATERPROOF MASTIC SEALANT BETWEEN THE BOX AND THE PLATE.

TRASH RACK NOTES:

* DIMENSIONS 'S' AND 'D' SHALL BE 0.8 TIMES SMALLEST ORIFICE DIAMETER UP TO A MAXIMUM OF SIX (6) INCHES.

1. BARS SHALL BE EVENLY SPACED AND CENTERED HORIZONTALLY AND VERTICALLY.

SAWCUT OPENING IN EXISTING

OUTLET STRUCTURE BOX

HOLE 'W'

H O

STRUCTURE BOX

OPENING DETAIL

RELEASE PLATE

DETAIL TRASH RACK DETAIL

OUTLET

NO.

DIMENSIONS AND ELEVATIONS

NOTESHOLE

(IN)

HOLE

(IN)

PLATE

(IN)

PLATE

(IN)

CONTROL

ORIFICE

DIA Ø

(IN)

CONTROL

ORIFICE

INVERT

(FT)

BASIN 2 21 14 25 18 10 416.40 NOTES

BASIN 4 32 24 36 28 20 416.50 NOTES

BASIN 5 20 20 16 SOLID PLATE - PLUG EX. ORIFICE

PLATE 'W'

E 'H

PLAN VIEW

NOT TO SCALE

CONCRETE ANTI-SEEP COLLAR

ELEVATION END VIEW

O.D.

6" REINF. CONC CAST

AROUND PIPE

6" REINF CONC.

S 1/

BASIN

TRAP

NO.

PIPE

SIZE

(IN)

NO.

COLLARS

RISER TO

FIRST

COLLAR

(FT)

COLLAR

SPACING

(FT)

BASIN 4 36 72 2 16 8

BASIN 5 36 72 2 11 8

NOTES:

COLLAR SHALL BE OF CAST IN PLACE 3000# CONCRETE WITH #4 BARS 8"

O.C.E.W. ACCOMODATING PIPE OPENING.

MINIMUM DISTANCE TO PIPE JOINT SHALL BE 2 FEET.

COLLAR SIZE AND SPACING SHALL BE AS INDICATED WITHIN TABLE.

EXIST. DOWNHILL TOE

OF BERM

EXIST. TOE OF

BASIN BERM

MATCH ELEVATION AND

WIDTH OF EXISTING

BERM TOP

MATCH SLOPE

OF EXISTING

ADJACENT BERM

WIDTH AS NEEDED TO

BLEND INTO BERM SECTION

BLEND GRADE FROM TOE TO INVERT

OF OUTLET STRUCTURE

O R

R B

P R

R T

M S

O N

SECTION VIEW

EXIST. OUTLET

STRUCTURE

CONC. ANTI-SEEP

COLLARS (SEE DETAIL)

MATCH ADJACENT BERM SIDE

SLOPES AND TOP ELEVATION

AND WIDTH

REPAIR PIPE AS

NEEED; COVER

EXPOSED PIPE WIHTIN

BERM GRADING

CONC. ANTI-SEEP

COLLAR (SEE DETAIL)

REMOVE ANY EXISTING GROUTING TO

COMPETENT BOX MATERIAL; PROVIDE NEW

NON-SHRINK GROUT FOR EXISTING PIPE

REPAIR BREAKS IN PIPE

JOINTS WITH PROPER CMP

JOINT BAND

EXIST. OUTLET

STRUCTURE

OUTLET STRUCTURE PIPE REPAIR

1ST

COLLAR

DIM.

NOT TO SCALE

OUTLET STRUCTURE-BERM REPAIR DETAILS

Xrefs: C:\Users\mpa\Dropbox\CAD PRODUCTION\HOA_Design_20250510.dwg C:\Users\mpa\Dropbox\CAD PRODUCTION\XR-BaseMap_20250510.dwg C:\Users\mpa\Dropbox\CAD PRODUCTION\XR-C3D_Design_20250510.dwg

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M1 -07

1.5" OF SUPERPAVE 9.5MM

2" OF SUPERPAVE 25MM

6" OF PENNDOT 2A

AGGREGATE BASE 3:1

3:13:1

3:1 3:1

3:1

1.5" OF SUPERPAVE 9.5MM

2" OF SUPERPAVE 25MM

6" OF PENNDOT 2A

AGGREGATE BASE

1.5" OF SUPERPAVE 9.5MM

2" OF SUPERPAVE 25MM

6" OF PENNDOT 2A

AGGREGATE BASE

1.5" OF SUPERPAVE 9.5MM

2" OF SUPERPAVE 25MM

6" OF PENNDOT 2A

AGGREGATE BASE

NOT TO SCALE

TRAIL CROSS-SECTIONS

VARIES %

STA 17+20 - 17+43.09

STA 0+00 - 0+14.50

STA 12+50 - 12+60

1.00%

STA 0+14.50 - 12+50.00

STA 12+60.00 - 17+20.00

3:1 3:1

P.G.

VARIES %

C U se r s\ m p a D r o p b o x C A D

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Sheets and Views

2023001_PCSM-PCSM1-01

2023001_PCSM-PCSM1-02

2023001_PCSM-PCSM1-03

2023001_PCSM-PCSM1-04

2023001_PCSM-PCSM1-05

2023001_PCSM-PCSM1-06

2023001_PCSM-PCSM1-07

File details come from the government source that posted it. Updated Sep 22, 2025.