4-HOFFMANS MILL DAM - ISSUED FOR BID - 06.26.2026.pdf

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IT IS A VIOLATION OF LAW FOR ANY

PERSON UNLESS ACTING UNDER THE

DIRECTION OF A LICENSED PROFESSIONAL

ENGINEER TO ALTER THIS DOCUMENT.

RAMBOLL AMERICAS ENGINEERING SOLUTIONS, INC.

HOFFMAN'S MILL DAM

REMOVAL

CONTRACT DRAWINGS

1180923.1940109512-G-1

SEPTEMBER 24, 2025

6/2 6/2

6 1

2:3 2:1

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ADAPTED FROM: WILMINGTON NORTH, DE, PE AND WEST CHESTER, PA USGS 7.5 MINUTE QUADRANGE MAPS, DATED 2023

SITE LOCATION MAP BRANDYWINE CONSERVANCY & MUSEUM OF ART

1 HOFFMAN'S MILL ROAD

P.O. BOX 141

CHADDS FORD, PA 19317

SITE

NORTH INDEX OF DRAWINGS

DWG. NO. SHEET TITLE

GENERAL

G-1 TITLE SHEET

G-2 ABBREVIATIONS, METHOD OF SECTIONING & INDEX OF DRAWINGS

CIVIL

C-1 EXISTING SITE PLAN

C-2 EROSION & SEDIMENT CONTROL PLAN

C-3 EROSION & SEDIMENT CONTROL NOTES & DETAILS

C-4 CONSTRUCTION ACCESS PLAN

C-5 DEMOLITION & GRADING PLAN

C-6 PROFILES, SECTIONS, DETAILS, & NOTES

WET WET

CO

GV

WV

PROPOSED MINOR CONTOUR

PROPOSED MAJOR CONTOUR

EXISTING MINOR CONTOUR

EXISTING MAJOR CONTOUR

PROPERTY LINE

FEMA 100-YEAR FLOODPLAIN LINE

EDGE OF PAVING

EDGE OF GRAVEL

BUILDING LINE

MUNICIPAL BOUNDARY LINE

EDGE OF WATER/STREAM/POND

SANITARY SEWER

GAS LINE

OVERHEAD WIRES

O/H ELEC.,TELECOM., CABLE LINES

OVERHEAD ELECTRIC LINE

UNDERGROUND ELECTRIC LINE

OVERHEAD TELECOMMUNICATION LINE

UNDERGROUND TELECOMMUNICATION LINE

WATER SERVICE LINE

FENCE LINE

GUIDE RAIL

CONCRETE CURB LINE

LEGAL RIGHT-OF-WAY

TREE LINE

WETLANDS

GUY WIRE

UTILITY POLE

AIR CONDITIONING UNIT

WELL

STREET SIGN

GAS MANHOLE

SANITARY MANHOLE

STORM MANHOLE

ELECTRIC MANHOLE

COMMUNICATIONS MANHOLE

WATER MANHOLE

GENERAL UTILITY MANHOLE

STORM INLET TYPE "C"

STORM INLET TYPE "M"

STORM INLET TYPE "S"

CITY STORM INLET

LIGHT POST

FIRE HYDRANT

SANITARY CLEAN OUT

WATER VALVE

GAS VALVE

MONUMENT FOUND

MONUMENT SET

PIPE/REBAR FOUND

5/8" REBAR SET

STAKE FOUND

STAKE SET

ORDINARY HIGH WATER MARK

IT IS A VIOLATION OF LAW FOR ANY PERSON, UNLESS

ACTING UNDER THE DIRECTION OF A LICENSED ENGINEER,

TO ALTER THIS DOCUMENT.

THIS DRAWING WAS PREPARED AT THE SCALE INDICATED. INACCURACIES IN THE STATED SCALE MAY BE INTRODUCED WHEN DRAWINGS ARE REPRODUCED BY ANY MEANS. USE THE GRAPHIC SCALE BAR TO DETERMINE THE ACTUAL SIZE. DRAWING IS NOT SCALABLE IF NO SCALE BAR IS

PRESENT.

NO. DATE REVISION INT.C:

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RAMBOLL AMERICAS ENGINEERING SOLUTIONS, INC.

SHEET DESCRIPTIONPROJECT

ADDRESS

PROJECT NO.

DATE

DESIGNER / PROFESSIONAL ENGINEER RESPONSIBLE

DRAWN BY

CHECKED BY

CLIENT

G-2

ABBREVIATIONS, METHOD OF SECTIONING &

INDEX OF DRAWINGS

HOFFMAN'S MILL DAM REMOVAL

1 HOFFMAN'S MILL ROAD

CHADDS FORD, PA 19317

BRANDYWINE CONSERVANCY &

MUSEUM OF ART 1180923.1940109512

01/08/2024

KENNETH CATINO, P.E.

K. GRIM

D. WHETSTONE

K. GRIM

0 06-26-2026 ISSUED FOR BID KAC

DESIGNED BY

B/ BOTTOM OF

B/E BOTTOM ELEVATION

BF BLIND FLANGE

BFF BELOW FINISHED FLOOR

BFG BELOW FINISHED GRADE

BFP BACK FLOW PREVENTER

BFV BUTTERFLY VALVE

BITUM. BITUMINOUS

BLDG. BUILDING

BLK. BLOCK

BM. BEAM or BENCHMARK BOC BOTTOM OF CURB or BACK OF CURB

BOF BOTTOM OF FOOTING

BOP BOTTOM OF PIPE

BITM. BOTTOM

BOW BOTTOM OF WALL

BRG. BEARING

BRK. BRICK

BS BOTH SIDES

BSMT. BASEMENT

BV BALL VALVE

BW BUTT WELD

CANTIL. CANTILEVER

CB CATCH BASIN

C/C CENTER TO CENTER

CEM. CEMENT

CEM. MORT. CEMENT MORTAR

CF CUBIC FEET

CFM CUBIC FEET PER MINUTE

CFS CUBIC FEET PER SECOND

CHAN. CHANNEL

CI CAST IRON

CIP CAST IRON PIPE OR CAST IN PLACE

CISP CAST IRON SOIL PIPE

CJ CONTROL JOINT

℄ CENTERLINE

CLR. CLEAR

CMH COMMUNICATION MANHOLE

CMP CORRUGATED METAL PIPE

CMU CONCRETE MASONRY UNIT

CO CLEAN OUT

COL. COLUMN

COMBO. COMBINATION

COMPT. COMPARTMENT

(C) COMPRESSION

CONC. CONCRETE OR CONCENTRIC

CONN. CONNECTION

CONST. CONSTRUCTION

CONST. JT. CONSTRUCTION JOINT

CONT. CONTINUE or CONTINUOUS

CONT'D. CONTINUED

CONTR. CONTRACT OR CONTRACTOR

CONTR. JT. CONTRACTION JOINT

COORD. COORDINATE

CORRUG. CORRUGATED

CP CONTROL POINT

CPVC CHLORINATED POLYVINYL CHLORIDE

CRS. COURSE

CS CARBON STEEL or CASCADE STEPS

CSES. COURSES

CSP CORRUGATED STEEL PIPE

CTR. CENTER

Cu. COPPER

CU. CUBIC

CV CHECK VALVE

CY CUBIC YARD

E EAST OR EASTING

EA. EACH

ECC. ECCENTRIC

ECV ELECTRIC CHECK VALVE

EF EACH FACE

EL. ELEVATION

ELEC. ELECTRIC or ELECTRICAL

ELL. ELBOW

EMBED. EMBEDMENT

EMER. EMERGENCY

EMH ELECTRIC MANHOLE

ENGR. ENGINEER

ENT. ENTRANCE

EO ELECTRIC OPERATOR

EOP EDGE OF PAVEMENT

EOS EDGE OF SHOULDER

EQ. EQUAL

EQUIP. EQUIPMENT

EQUIV. EQUIVALENT

EW EACH WAY

EXIST. EXISTING

EXC. EXCAVATION

EXP. EXPANSION or EXPOSED

EJ EXPANSION JOINT

EXP. STR. EXPOSED STRUCTURE

F/ FACE OF

FD FLOOR DRAIN

FDN. FOUNDATION

FF FINISH FLOOR

F/F FACE TO FACE

FFE FINISH FLOOR ELEVATION

FG FINISHED GRADE

FH FIRE HYDRANT

FIG. FIGURE

FIN. FINISH

FLR. FLOOR

FLG. FLANGE OR FLANGED

FLV FLAP VALVE

FM FORCE MAIN

FPM FEET PER MINUTE

FPS FEET PER SECOND

FR. FRAME

FRC FIBER REINFORCED CONCRETE

FS FAR SIDE

FT. FEET or FOOT

FTG. FOOTING

FV FIELD VERIFY

GAL. GALLON(S)

GALV. GALVANIZED

GB GRADE BEAM

GEN. GENERAL

GLV GLOBE VALVE

GOVT. GOVERNMENT

GPH GALLONS PER HOUR

GPM GALLONS PER MINUTE

GR GRADE OR GUARD RAIL OR GUIDE RAIL

GRTG. GRATING

GS GALVANIZED STEEL

GV GATE VALVE

GVL. GRAVEL

GW GROUNDWATER

HDPE HIGH DENSITY POLYETHYLENE

HDW. HARDWARE

HVY. HEAVY

HGT. HEIGHT

HORIZ. HORIZONTAL

HP HORSE POWER OR HIGH POINT

HS HIGH STRENGTH

HT. HEIGHT

HV HAND VALVE

HYD. HYDRANT

K. KIPS (1K = 1000 POUNDS)

KCMIL THOUSAND CIRCULAR MILS

K-FT KIP FOOT

K/FT KIPS PER FOOT

KGV KNIFE GATE VALVE

KSF KIPS PER SQUARE FOOT

OC ON CENTER

OD OUTSIDE DIAMETER

OSF OUTSIDE FACE

OH OVERHEAD

OHE OVERHEAD ELECTRIC

OHWM ORDINARY HIGH WATER MARK

OFALL. OPENING

OPP. OPPOSITE

OSHA OCCUPATIONAL SAFETY AND HEALTH

ADMINISTRATION

O/F OVERFLOW

OZ. OUNCE

"A"

"B"

"D"

"E"

"G"

"K"

"O"

L ANGLE

LB. POUND

LBS. POUNDS

LDPE LOW DENSITY POLYETHYLENE

LF LINEAR FEET

LL LIVE LOAD

LLH LONG LEG HORIZONTAL

LLO LONG LEG OUTSTANDING

LLV LONG LEG VERTICAL

LG. LENGTH or LONG

LONGIT. LONGITUDINAL

LP LIGHT POLE OR LOW POINT

LR LONG RADIUS

LT. LEFT

LW LIGHTWEIGHT

LWIC LIGHT WEIGHT INSULATING CONC.

"L"

"H"

"F"

"C"

DIV. DIVISION

DN. DOWN

DP DIFFERENTIAL PRESSURE

DPCO DECK PLATE CLEAN OUT

D/S DOWN STREAM

DV DIAPHRAGM VALVE

DWG. DRAWING

DWL. DOWEL

JST. JOIST

JT. JOINT

"J"

N NORTH or NORTHING

N/A NOT APPLICABLE

NAT. NATURAL

NC NORMALLY CLOSED

NE NORTH EAST

NF NEAR FACE

NIC NOT IN CONTRACT

NO NORMALLY OPEN

NO. OR # NUMBER

NOM. NOMINAL

NOR. NORMAL

NPT NATIONAL PIPE THREAD

NRS NON-RISING STEM

NS NEAR SIDE

NTS NOT TO SCALE

NW NORTH WEST

"N"

MAN. MANUAL

MAS. MASONRY

MATL. MATERIAL

MAX. MAXIMUM

MD METAL DECK

MECH. MECHANICAL

MEZZ. MEZZANINE

MFD. MANUFACTURED

MFG. MANUFACTURING

MFR. MANUFACTURER

MGD MILLION GALLONS PER DAY

MH MANHOLE

MIN. MINIMUM

MISC. MISCELLANEOUS

MO MASONRY OPENING

MOD. MODIFICATION

MON. MONUMENT

MOV MOTOR OPERATED VALVE

MTD. MOUNTED

MTL. METAL

MV MUD VALVE

MW MONITORING WELL

"M"

R RADIUS or RISER

RCP REINFORCED CONCRETE PIPE

RD. ROAD

RECT. RECTANGLE or RECTANGULAR RED. REDUCE or REDUCER

REF. REFER OR REFERENCE

REINF. REINFORCE

REM. REMOVABLE

REQ'D. REQUIRED

REV. REVISED or REVISION

RM. ROOM

RO ROUGH OPENING

ROW RIGHT-OF-WAY

RR RAILROAD

RT. RIGHT

"Q"

QTY. QUANTITY

QUAL. QUALITY

PAR. PARALLEL

PCP PRECAST CONCRETE PLANK

PCI POUNDS PER CUBIC INCH

PE POLYETHYLENE

PERF. PERFORATED

PI POINT OF INTERSECTION

PIV POST INDICATOR VALVE

PL OR ⅊ PROPERTY LINE

PL. PLATE

PLWD. PLYWOOD

PNT. POINT

POC POINT OF CONNECTION

PP POLYPROPYLENE

PREFAB. PREFABRICATED

PRI. PRIMARY

PROP. PROPOSED

PSF POUNDS PER SQUARE FOOT

PSI POUNDS PER SQUARE INCH

PT PRESSURE TREATED

PV PLUG VALVE

PVC POLYVINYL CHLORIDE

PVT. PAVEMENT

"P"

S SOUTH

SAN. SANITARY

S/C SITE/CIVIL

SCFM STANDARD CUBIC FEET PER MINUTE

SCH. SCHEDULE

SD STORM DRAIN

SE SOUTH EAST

SEC. SECOND or SECONDARY

SECT. SECTION

SF SILT FENCE or SQUARE FOOT

SHT. SHEET

SICPP SMOOTH INTERIOR CORRUGATED

POLYETHYLENE PIPE

SG SLIDE GATE OR SLUICE GATE

SIM. SIMILAR

SIST STORM INLET SEDIMENT TRAP

SJ STEEL JOIST

SMH STORM MANHOLE

SOLV. WLD. SOLVENT WELDED

SPA. SPACES, SPACED OR SPACING

SPEC. SPECIFICATION

SQ. SQUARE

SS STAINLESS STEEL

SSD SUB-SOIL DRAIN

ST. STORM or STREET

STA. STATION

STD. STANDARD

STIFF. STIFFENER

STIRR. STIRRUP

STL. STEEL

STRUCT. STRUCTURE OR STRUCTURAL

SUSP. SUSPEND or SUSPENDED

SW SOUTH WEST

SWM STORM WATER MANAGEMENT

SYM. SYMMETRICAL or SYMMETRICALLY

"S"

T. TANGENT, TREAD or TOP

(T) TENSION

TEMP. TEMPERATURE

T/ OR T.O. TOP OF

TOS TOP OF STEEL

T&B TOP AND BOTTOM

T/EL TOP ELEVATION

T&G TONGUE AND GROOVE

THK. THICK

THKNS. THICKNESS

THRD. THREADED

TMH TELEPHONE MANHOLE

T/B TOP OF BLOCK

T/C TOP OF CURB

T/F TOP OF FOOTING

TOL. TOLERANCE

T/P TOP OF PIPE or TOP OF PLANK T/S TOP OF SLAB or TOP OF STEEL

TOT. TOTAL

T/W TOP OF WALL

TYP. TYPICAL

UD UNDER DRAIN

UG UNDERGROUND

UGE UNDERGROUND ELECTRIC

UNO UNLESS NOTED OTHERWISE

U/S UNDERSIDE OR UP STREAM

USGS UNITED STATES GEOLOGICAL SURVEY

VC VITRIFIED CLAY

VERT. VERTICAL

VIF VERIFY IN FIELD

VOL. VOLUME

"T"

"V"

"U"

W WATER or WEST

W/ WITH

W/O WITHOUT

WD. WOOD

WP WORK POINT

WF WIDE FLANGE

WG WEIR GATE

WLD. WELD OR WELDED

WS WATERSTOP OR WATER SURFACE

WT WATER TABLE

WT. WEIGHT

WWF WELDED WIRE FABRIC

XS EXTRA STRONG

YD. YARD

YR. YEAR

"Y"

"W"

"X"

GENERAL ABBREVIATIONS

D DRAIN

DEG. DEGREE

DEPT. DEPARTMENT

DESCR. DESCRIPTION

DET. DETAIL

DL DEAD LOAD

DI DUCTILE IRON

DIA. or Ø DIAMETER DIAG. DIAGONAL or DIAGRAM

DIM. DIMENSION

DIP DUCTILE IRON PIPE

DISCH. DISCHARGE

"D"

ID IDENTIFICATION NUMBER or INSIDE DIA.

I.S.F. INSIDE FACE

IN. INCH or INCHES INCL. INCLUDED or INCLUDING

IND. INDUSTRIAL

INFO. INFORMATION

INSUL. INSULATED or INSULATION

INV. INVERT

IP IRON PIPE

IPF IRON PIN FOUND

"I"

"R"

& AND

@ AT

AB ANCHOR BOLT

ABBR. ABBREVIATION

AC. ACRE

ACFM ACTUAL CUBIC FEET PER MINUTE

ACI AMERICAN CONCRETE INSTITUTE

ADD'L. ADDITIONAL

ADJ. ADJUSTABLE

AFF ABOVE FINISHED FLOOR

AFG ABOVE FINAL GRADE

AISC AMERICAN INSTITUTE OF STEEL CONSTR.

ALT. ALTERNATE

ALUM. ALUMINUM

ANSI AMERICAN NATIONAL STANDARDS INSTITUTE

AOBE AS ORDERED BY ENGINEER

APPD. APPROVED

APPROX. APPROXIMATE

ARCH. ARCHITECTURAL

ASCE AMERICAN SOCIETY OF CIVIL ENGINEERS

ASPH. ASPHALT

ASTM AMERICAN SOCIETY FOR TESTING AND MAT.

AUTO AUTOMATIC

AUX. AUXILIARY

AVG. AVERAGE

AWS AMERICAN WELDING SOCIETY

AWWA AMERICAN WATER WORKS ASSOCIATION

METHOD OF SECTIONING AND DETAILING

DRAWING WHERE SECTION IS SHOWN

DRAWING WHERE SECTION IS TAKEN

THE DRAWING UPON WHICH A SECTION, VIEW, OR DETAIL HAS BEEN TAKEN AND THE DRAWING UPON WHICH THE SECTION, VIEW, OR DETAIL HAS BEEN

SHOWN IS CROSS-REFERENCED WITH SYMBOLS AS FOLLOWS:

THE DESIGNATION IN THE UPPER HALF OF

THE CIRCLE IS THE SECTION NUMBER. THE

BOTTOM DESIGNATION REFERS TO THE

DRAWING NUMBER ON WHICH THE SECTION

CAN BE FOUND.

THIS IS SHOWN UNDER EACH SECTION. THE

TOP DESIGNATION IS THE SECTION NUMBER.

THE BOTTOM DESIGNATION REFERS TO THE

DRAWING NUMBER WHERE THE SECTION HAS

BEEN TAKEN.

DRAWING WHERE DETAIL IS TAKEN

DRAWING WHERE DETAIL IS SHOWN

THE DESIGNATION IN THE UPPER HALF OF

THE CIRCLE IS THE DETAIL LETTER. THE

BOTTOM DESIGNATION REFERS TO THE

DRAWING NUMBER ON WHICH THE DETAIL

CAN BE FOUND.

THIS IS SHOWN UNDER EACH DETAIL. THE

TOP DESIGNATION IS THE DETAIL LETTER.

THE BOTTOM DESIGNATION REFERS TO THE

DRAWING NUMBER WHERE THE DETAIL HAS

BEEN TAKEN.

C-1

2' 0 2' 4'4'1/4"=1'-0"

SECTION1

C-1 2' 0 2' 4'4'1/4"=1'-0"

DETAILA

C-1

A C-1

1. RECORD OWNER

PENNSBURY TOWNSHIP & CHADDS FORD TOWNSHIP

2. SITE ADDRESS:

HOFFMANS'S MILL DAM

CHADDS FORD, PA 19317

3. TOPOGRAPHIC AND PHYSICAL IMPROVEMENTS SHOWN ARE FROM FIELD

SURVEY BY HOWELL SURVEYING, LLC. PERFORMED ON 07/31/2024.

4. PECO ELECTRIC TRANSMISSION LINES AND TOWERS SHOWN ON THESE PLANS

ARE DIGITIZED BASED ON UNMANNED AERIAL VEHICLE IMAGERY COLLECTED

BY HOWELL SURVEYING, LLC., AND MAY VARY FROM SHOWN.

5. THIS MAP AND SURVEY WERE PREPARED FROM INFORMATION OF RECORD,

FURNISHED AND/OR OBTAINED, TOGETHER WITH EVIDENCE FOUND ON THE

GROUND. THIS PLAN DOES NOT REPRESENT A BOUNDARY SURVEY. THIS

SURVEY WAS PERFORMED WITHOUT THE BENEFIT OF A CURRENT TITLE

REPORT, WHICH WOULD DISCLOSE ANY RIGHTS, RESERVATIONS, EASEMENTS,

ETC... OF RECORD.

6. CONTOURS PLOTTED FROM FIELD RUN TOPOGRAPHIC SURVEY BY HOWELL

SURVEYING, L.L.C.. DATUM: AERIAL IMAGERY AND NAVD 88 (COMPUTED USING

GEOID18) & NAD 83 (2011) (EPOCH:2010.0000) (AS DETERMINED BY GPS

OBSERVATION), SITE BENCH = DRILL HOLE, ELEVATION= 155.76', CONTOUR

INTERVAL: 1 FOOT.

7. UNDERGROUND UTILITIES SHOWN WERE PLOTTED FROM OBSERVABLE

EVIDENCE AT THE TIME OF SURVEY AND INFORMATION FROM PLANS SUPPLIED

BY UTILITY COMPANIES. NO GUARANTEE IS MADE THAT UNDERGROUND

UTILITIES ARE ACCURATELY OR COMPLETELY SHOWN HEREON.

8. THIS PROPERTY IS LOCATED PARTIALLY WITHIN FLOOD HAZARD ZONE AE,

ZONE X, AN AREA OF MINIMAL FLOOD HAZARD PER THE NATIONAL FLOOD

INSURANCE RATE MAP FOR CHESTER COUNTY, PA. MAP NO. 42029C0305G,

PANEL 305 OF 380, DATED SEPTEMBER 29, 2017. FLOOD PLAIN BOUNDARIES

SHOWN HEREON WERE SCALED FROM THE ABOVE MENTIONED MAP.

9. THIS PROPERTY IS LOCATED PARTIALLY WITHIN FLOOD HAZARD ZONE AE,

ZONE X, AN AREA OF MINIMAL FLOOD HAZARD PER THE NATIONAL FLOOD

INSURANCE RATE MAP FOR DELAWARE COUNTY, PA. MAP NO. 42045C0152G,

PANEL 152 OF 250, DATED JULY 5, 2017. FLOOD PLAIN BOUNDARIES SHOWN

HEREON WERE SCALED FROM THE ABOVE MENTIONED MAP.

SURVEY AND GENERAL NOTES FOR ALL DRAWINGS

LEGEND

1 HOFFMAN'S MILL ROAD, P.O. BOX 141

CHADDS FORD, PA 19317

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50 FT

IT IS A VIOLATION OF LAW FOR ANY PERSON, UNLESS

ACTING UNDER THE DIRECTION OF A LICENSED ENGINEER,

TO ALTER THIS DOCUMENT.

THIS DRAWING WAS PREPARED AT THE SCALE INDICATED. INACCURACIES IN THE STATED SCALE MAY BE INTRODUCED WHEN DRAWINGS ARE REPRODUCED BY ANY MEANS. USE THE GRAPHIC SCALE BAR TO DETERMINE THE ACTUAL SIZE. DRAWING IS NOT SCALABLE IF NO SCALE BAR IS

PRESENT.

SCALE IN FEET

1005050

NO. DATE REVISION INT.C:

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:43 A

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RAMBOLL AMERICAS ENGINEERING SOLUTIONS, INC.

SHEET DESCRIPTIONPROJECT

ADDRESS

PROJECT NO.

DATE

DESIGNER / PROFESSIONAL ENGINEER RESPONSIBLE

DRAWN BY

CHECKED BY

CLIENT

C-1

EXISTING SITE PLANHOFFMAN'S MILL DAM REMOVAL

1 HOFFMAN'S MILL ROAD

CHADDS FORD, PA 19317

BRANDYWINE CONSERVANCY &

MUSEUM OF ART 1180923.1940109512

01/08/2024

KENNETH CATINO, P.E.

K. GRIM

CHADDS FORD, PA 19317

U.S. ROUTE 1 BRIDGE

BRANDYWINE CREEK

EDGE OF WATER

(VARIES)

HOFFMAN'S MILL

DAM

WALKING TRAIL

GRAVEL PARKING

AREAS

WALKING TRAILS

EDGE OF WATER

(VARIES)

BRANDYWINE

MUSEUM OF ART

COMPLEX

EAST PENN

RAILROAD

PENNSBURY TOWNSHIP

CHADDS FORD TOWNSHIP

PENNSBURY TOWNSHIP

CHADDS FORD TOWNSHIP

PECO OVERHEAD

ELECTRIC

TRANSMISSION LINES

COLUMBIA GAS TRANSMISSION

20-IN. DIA. HIGH PRESSURE GAS

PIPELINE

SEE ABOVEGROUND UTILITY

NOTES ON SHEET C-6

COLUMBIA GAS TRANSMISSION

RIGHT-OF-WAY

PENNDOT

R.O.W. LINE

PENNDOT

R.O.W. LINE

BENCHMARK

EL 155.76

OHWM

OHWM

OHWM

FEMA 100-YEAR FLOODPLAIN

BOUNDARY

FEMA 100-YEAR FLOODPLAIN

BOUNDARY

N/L LANDS OF

PHILADELPHIA ELECTRIC COMPANY

PARCEL #04-00-00061-01

RECORD BOOK 1784, PAGE 362

N/L LANDS OF

BRANDYWINE CONSERVANCY & MUSEUM OF ART

PARCEL #04-00-00180-00

RECORD BOOK 6705, PAGE 4094

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WET

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WET

WET

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N/L LANDS OF

PHILADELPHIA ELECTRIC COMPANY

PARCEL #04-00-00061-01

RECORD BOOK 1784, PAGE 362

N/L LANDS OF

EDWARD MCNAMARA

PARCEL #64-4-10

RECORD BOOK 10657, PAGE 1304

LANDS N/L OF

EAST PENN RAILWAYS INC.

PARCEL #64-4-4

RECORD BOOK 6613, PAGE 1021

25 FT

25 FT

IT IS A VIOLATION OF LAW FOR ANY PERSON, UNLESS

ACTING UNDER THE DIRECTION OF A LICENSED ENGINEER,

TO ALTER THIS DOCUMENT.

THIS DRAWING WAS PREPARED AT THE SCALE INDICATED. INACCURACIES IN THE STATED SCALE MAY BE INTRODUCED WHEN DRAWINGS ARE REPRODUCED BY ANY MEANS. USE THE GRAPHIC SCALE BAR TO DETERMINE THE ACTUAL SIZE. DRAWING IS NOT SCALABLE IF NO SCALE BAR IS

PRESENT.

NO. DATE REVISION INT.C:

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RAMBOLL AMERICAS ENGINEERING SOLUTIONS, INC.

SHEET DESCRIPTIONPROJECT

ADDRESS

PROJECT NO.

DATE

DESIGNER / PROFESSIONAL ENGINEER RESPONSIBLE

DRAWN BY

CHECKED BY

CLIENT

C-2

EROSION & SEDIMENT CONTROL PLANHOFFMAN'S MILL DAM REMOVAL

1 HOFFMAN'S MILL ROAD

CHADDS FORD, PA 19317

BRANDYWINE CONSERVANCY &

MUSEUM OF ART 1180923.1940109512

01/08/2024

KENNETH CATINO, P.E.

K. GRIM

CHADDS FORD, PA 19317

ATTENTION ALL CONTRACTORS: LOCATIONS OF ALL EXISTING

UTILITIES SHOWN HEREON HAVE BEEN DEVELOPED FROM

UTILITY COMPANY RECORDS AND/OR ABOVE-GROUND

INSPECTION OF THE SITE. COMPLETENESS OR ACCURACY OF

TYPE, SIZE, DEPTH OR HORIZONTAL LOCATION OF

UNDERGROUND FACILITIES OR STRUCTURES CANNOT BE

GUARANTEED. PURSUANT TO REQUIREMENTS OF

PENNSYLVANIA LEGISLATIVE ACT NUMBER 287 OF 1974 AS

AMENDED BY ACT 121 OF 2008, CONTRACTORS MUST VERIFY

LOCATION AND DEPTH OF ALL UNDERGROUND UTILITIES AND

FACILITIES PRIOR TO START OF WORK.

030' 30'1" = 30'

EROSION & SEDIMENT CONTROL PLAN

1"=80'-0"

NORTH

COMPOST

FILTER SOCK

DELINEATE WORK AREA

USING CONES OR

FENCING DURING

ACTIVE CONSTRUCTION

AND INSTALL "TRAIL

AND PARKING AREA

CLOSED" SIGNAGE

GRAVEL PARKING LOT

GRAVEL PARKING LOT

BRANDYWINE CREEK

U.S. ROUTE 1

ROCK CONSTRUCTION ENTRANCE

MIN. 50 FEET IN LENGTH

C C-3

E C-3

CONTRACTOR PARKING

AND LAYDOWN AREA

U.S. ROUTE 1

HISTORIC MILL RACE

CROSSING:

CONTRACTOR TO

AVOID IMPACTS TO

WETLAND; SEE NOTE 1,

BELOW.

INSTALL "TRAIL CLOSED"

SIGNAGE AND EXCLUSION

FENCING DURING ACTIVE

CONSTRUCTION

PLACE "TRAIL CLOSED"

SIGNAGE AND

EXCLUSION FENCING

DURING ACTIVE

CONSTRUCTION

CONTRACTOR TO USE TIMBER

MATS TO CROSS WETLAND;

RESTORE WETLAND TO

PRE-CONSTRUCTION CONDITIONS

FOLLOWING CONSTRUCTION

EAST PENN RAILROAD

U.S. ROUTE 1 BRIDGE

PENNSBURY TOW

NSHIP

CHADDS FORD TOW

NSHIP

HOFFMAN'S MILL DAM

LOCATION OF KNOWN RARE PLANT

SPECIES ROTALA RAMOSIOR

(TOOTH-CUP) CONTRACTOR SHALL

AVOID ALL IMPACTS TO THIS AREA

NOTES:

1. CONTRACTOR SHALL ENSURE PROTECTION OF THE HISTORIC MILL RACE AND ASSOCIATED

WETLAND HABITAT WHILE USING THE SITE ACCESS. PROTECTION MEASURES SUCH AS TIMBER MATS

MAY BE USED.

PROVIDE BOG TURTLE

EXCLUSION SILT

FENCING ALONG LOD

CONTRACTOR TO REMOVE

WOODEN SPLIT RAIL FENCE

FOR EQUIPMENT ACCESS;

FENCE MUST BE REPLACED IN

KIND AT COMPLETION OF

PROJECT

REMOVE EXISTING STONE STEPS AT THIS

LOCATION AND PLACE THEM IN A STORAGE

AREA AS SPECIFIED BY BRANDYWINE

CONSERVANCY; STEPS WILL NOT BE REPLACED

FOLLOWING CONSTRUCTION

COLUMBIA GAS TRANSMISSION

20-IN. DIA. HIGH PRESSURE GAS

PIPELINE

SEE UTILITY NOTES ON SHEET

C-6

10-FT MIN. OFFSET

BETWEEN LOD AND

PIPELINE CENTERLINE

7-FT MIN. OFFSET

BETWEEN LOD AND

PIPELINE CENTERLINE REMOVE SECTION OF CHAINLINK FENCE IF

NECESSARY FOR ACCESS. CONTRACTOR

SHALL DISPOSE OF REMOVED FENCE MATERIAL

OFF-SITE.

COLUMBIA GAS TRANSMISSION

RIGHT-OF-WAY

1" = 30'

OHWM

OHWM

OHWM

IT IS A VIOLATION OF LAW FOR ANY PERSON, UNLESS

ACTING UNDER THE DIRECTION OF A LICENSED ENGINEER,

TO ALTER THIS DOCUMENT.

THIS DRAWING WAS PREPARED AT THE SCALE INDICATED. INACCURACIES IN THE STATED SCALE MAY BE INTRODUCED WHEN DRAWINGS ARE REPRODUCED BY ANY MEANS. USE THE GRAPHIC SCALE BAR TO DETERMINE THE ACTUAL SIZE. DRAWING IS NOT SCALABLE IF NO SCALE BAR IS

PRESENT.

NO. DATE REVISION INT.C:

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RAMBOLL AMERICAS ENGINEERING SOLUTIONS, INC.

SHEET DESCRIPTIONPROJECT

ADDRESS

PROJECT NO.

DATE

DESIGNER / PROFESSIONAL ENGINEER RESPONSIBLE

DRAWN BY

CHECKED BY

CLIENT

C-3

EROSION & SEDIMENT CONTROL

NOTES & DETAILS

HOFFMAN'S MILL DAM REMOVAL

1 HOFFMAN'S MILL ROAD

CHADDS FORD, PA 19317

BRANDYWINE CONSERVANCY &

MUSEUM OF ART 1180923.1940109512

01/08/2024

KENNETH CATINO, P.E.

K. GRIM

CHADDS FORD, PA 19317

NOT TO SCALE

STABILIZED CONSTRUCTION ENTRANCEE

NOT TO SCALE

EROSION CONTROL BLANKET (ECB) INSTALLATION

DETAILB

STANDARD CONSTRUCTION DETAIL #3-1

ROCK CONSTRUCTION ENTRANCE

50' MIN.

FT.

EXISTING ROADWAY

EARTH FILL

PIPE AS NECESSARY

GEOTEXTILE

EXISTING

GROUND

MIN 8" AASHTO #1

MOUNTABLE

BERM (6 IN. MIN.)*

M

IN

M

IN

M

IN

EX

IS

TI

N

G R

O

AD

W

AY

PROFILE

PLAN VIEW

NOTES:

REMOVE TOPSOIL PRIOR TO INSTALLATION OF ROCK CONSTRUCTION ENTRANCE. EXTEND ROCK OVER

FULL WIDTH OF ENTRANCE.

RUNOFF SHALL BE DIVERTED FROM ROADWAY TO A SUITABLE SEDIMENT REMOVAL BMP PRIOR TO

ENTERING ROCK CONSTRUCTION ENTRANCE.

MOUNTABLE BERM SHALL BE INSTALLED WHEREVER OPTIONAL CULVERT PIPE IS USED AND PROPER PIPE COVER AS SPECIFIED BY MANUFACTURER IS NOT OTHERWISE PROVIDED. PIPE SHALL BE SIZED

APPROPRIATELY FOR SIZE OF DITCH BEING CROSSED.

MAINTENANCE: ROCK CONSTRUCTION ENTRANCE THICKNESS SHALL BE CONSTANTLY MAINTAINED TO THE SPECIFIED DIMENSIONS BY ADDING ROCK. A STOCKPILE SHALL BE MAINTAINED ON SITE FOR THIS PURPOSE. ALL SEDIMENT DEPOSITED ON PAVED ROADWAYS SHALL BE REMOVED AND RETURNED TO THE CONSTRUCTION SITE IMMEDIATELY. IF EXCESSIVE AMOUNTS OF SEDIMENT ARE BEING DEPOSITED ON

ROADWAY, EXTEND LENGTH OF ROCK CONSTRUCTION ENTRANCE BY 50 FOOT INCREMENTS UNTIL

CONDITION IS ALLEVIATED OR INSTALL WASH RACK. WASHING THE ROADWAY OR SWEEPING THE DEPOSITS INTO ROADWAY DITCHES, SEWERS, CULVERTS, OR OTHER DRAINAGE COURSES IS NOT

ACCEPTABLE.

* MOUNTABLE BERM USED TO PROVIDE PROPER COVER FOR PIPE

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.

STANDARD CONSTRUCTION DETAIL #4-1

COMPOST FILTER SOCK

FL

OW

FLO

W

DISTURBED AREA

UNDISTURBED AREA

SECTION

PLAN VIEW

EXISTING

CONTOURS

COMPOST

FILTER SOCK

2 IN. x 2 IN.

WOODEN STAKES

PLACED 10 FT ON

CENTER

2 IN. x 2 IN. WOODEN STAKES

PLACED 10 FT ON CENTER

COMPOST FILTER SOCK

BLOWN/PLACED

FILTER MEDIA

DISTURBED AREA

UNDISTURBED AREA

NOTES:

SOCK FABRIC SHALL MEET STANDARDS OF TABLE 4.1 OF THE PA DEP EROSION CONTROL MANUAL.

COMPOST SHALL MEET THE STANDARDS OF TABLE 4.2 OF THE PA DEP EROSION CONTROL MANUAL.

COMPOST FILTER SOCK SHALL BE PLACED AT EXISTING LEVEL GRADE. BOTH ENDS OF THE BARRIER SHALL BE EXTENDED AT LEAST 8 FEET UP SLOPE AT 45 DEGREES TO THE MAIN BARRIER ALIGNMENT.

MAXIMUM SLOPE LENGTH ABOVE ANY BARRIER SHALL NOT EXCEED THAT SPECIFIED FOR THE SIZE OF THE

SOCK AND THE SLOPE OF ITS TRIBUTARY AREA.

TRAFFIC SHALL NOT BE PERMITTED TO CROSS COMPOST FILTER SOCKS.

ACCUMULATED SEDIMENT SHALL BE REMOVED WHEN IT REACHES 1/2 THE ABOVE GROUND HEIGHT OF

THE BARRIER AND DISPOSED IN THE MANNER DESCRIBED ELSEWHERE IN THE PLAN.

COMPOST FILTER SOCKS SHALL BE INSPECTED WEEKLY AND AFTER EACH RUNOFF EVENT. DAMAGED SOCKS SHALL BE REPAIRED ACCORDING TO MANUFACTURER’S SPECIFICATIONS OR REPLACED WITHIN 24

HOURS OF INSPECTION.

BIODEGRADABLE COMPOST FILTER SOCKS SHALL BE REPLACED AFTER 6 MONTHS; PHOTODEGRADABLE SOCKS AFTER 1 YEAR. POLYPROPYLENE SOCKS SHALL BE REPLACED ACCORDING TO MANUFACTURER’S

RECOMMENDATIONS.

UPON STABILIZATION OF THE AREA TRIBUTARY TO THE SOCK, STAKES SHALL BE REMOVED. THE SOCK MAY BE LEFT IN PLACE AND VEGETATED OR REMOVED. IN THE LATTER CASE, THE MESH SHALL BE CUT

OPEN AND THE MULCH SPREAD AS A SOIL SUPPLEMENT.

IN

M

IN

NOT TO SCALE

COMPOST FILTER SOCKC

SECTION VIEW

INNER 12" TO 24" DIAM.

PERFORATED HDPE OR

PVC PIPE

NATURAL FIRM MATERIAL

LAKE BOTTOM - TOP

OF ACCUMULATED

SEDIMENT

TOP OF PIPES

12" MIN. ABOVE

LAKE BOTTOM

SEDIMENT REMOVED

AND ANNULAR SPACE

FILLED WITH AASHTO

NO. 57 STONE

BOTTOM OF INNER PIPE

MIN. 6" ABOVE FIRM BOTTOM

PUMP INTAKE HOSE

OUTER 24" TO 36" DIAM.

PERFORATED HDPE OR

PVC PIPE WRAP INNER PIPE

WITH NON-WOVEN

GEOTEXTILE

NOT TO SCALE

DEWATERING FACILITYF

NOTES:

DEWATERING FACILITIES TO BE INSTALLED AFTER THE WATER LEVEL IN THE LAKE HAS BEEN DRAWN

DOWN TO WITHIN 12" OF THE TOP OF THE ACCUMULATED SEDIMENT.

LOCATE DEWATERING FACILITY AT EACH PUMP INTAKE. MULTIPLE DEWATERING FACILITIES MAY BE

REQUIRED TO ACHIEVE DESIRED CONTROL OF WATER.

OUTER PIPE SHALL BE DRIVEN INTO ACCUMULATED BOTTOM SEDIMENT UNTIL ENCOUNTERING FIRM NATURAL GRADE OR ROCK. SEDIMENT WITHIN THE PIPE SHALL BE REMOVED AND PROPERLY DISPOSED OF. A MINIMUM 6" OF CLEAN AASHTO NO. 57 STONE SHALL BE PLACED IN THE BOTTOM. WRAP THE INNER PIPE IN NON-WOVEN GEOTEXTILE AND INSERT INTO THE CENTER OF THE OUTER PIPE. THE VOID SPACE

BETWEEN THE PIPES SHALL BE FILLED WITH AASHTO NO. 57 STONE.

PIPES TO EXTEND 12" MIN. ABOVE EXISTING LAKE BOTTOM SEDIMENT.

DISCHARGE FROM PUMP SHALL BE TO A STABLE AREA BELOW DISTURBANCES FROM THE WORK ZONE.

DEWATERING FACILITY MAY BE USED IN CONJUNCTION WITH FILTER BAG WHERE ADDITIONAL FILTERING IS

NEEDED.

CONTRACTOR MAY PROPOSE ALTERNATE MEANS OF DEWATERING THE ACCUMULATED SEDIMENT, BUT IN

NO CASE SHALL FILL MATERIALS BE PLACED IN A WATER OF THE U.S.

STANDARD CONSTRUCTION DETAIL #3-16

PUMPED WATER FILTER BAG

FILTER BAG

WELL VEGETATED, GRASSY AREA

WELL VEGETATED, GRASSY AREA

FILTER BAG

INTAKE HOSE

PUMP

DISCHARGE HOSE

CLAMPS

CLAMPS

DISCHARGE HOSE

PUMP INTAKE HOSE

HEAVY DUTY LIFTING STRAPS

(RECOMMENDED)

PLAN VIEW

ELEVATION VIEW

NOTES:

LOW VOLUME FILTER BAGS SHALL BE MADE FROM NON-WOVEN GEOTEXTILE MATERIAL SEWN WITH HIGH STRENGTH, DOUBLE STITCHED "J" TYPE SEAMS. THEY SHALL BE CAPABLE OF TRAPPING PARTICLES LARGER THAN 150 MICRONS. HIGH VOLUME FILTER BAGS SHALL BE MADE FROM WOVEN GEOTEXTILES

THAT MEET THE FOLLOWING STANDARDS:

A SUITABLE MEANS OF ACCESSING THE BAG WITH MACHINERY REQUIRED FOR DISPOSAL PURPOSES SHALL BE PROVIDED. FILTER BAGS SHALL BE REPLACED WHEN THEY BECOME 1/2 FULL OF SEDIMENT. SPARE BAGS SHALL BE KEPT AVAILABLE FOR REPLACEMENT OF THOSE THAT HAVE FAILED OR ARE FILLED. BAGS SHALL BE PLACED ON STRAPS TO FACILITATE REMOVAL UNLESS BAGS COME WITH LIFTING STRAPS ALREADY ATTACHED.

BAGS SHALL BE LOCATED IN WELL-VEGETATED (GRASSY) AREA, AND DISCHARGE ONTO STABLE, EROSION RESISTANT AREAS. WHERE THIS IS NOT POSSIBLE, A GEOTEXTILE UNDERLAYMENT AND FLOW PATH SHALL BE PROVIDED. BAGS MAY BE PLACED ON FILTER STONE TO INCREASE DISCHARGE CAPACITY. BAGS SHALL NOT BE PLACED ON SLOPES GREATER THAN 5%. FOR SLOPES EXCEEDING 5%, CLEAN ROCK OR OTHER NON-ERODIBLE AND NON-POLLUTING MATERIAL MAY BE PLACED UNDER THE BAG TO REDUCE SLOPE STEEPNESS.

NO DOWNSLOPE SEDIMENT BARRIER IS REQUIRED FOR MOST INSTALLATIONS. COMPOST BERM OR COMPOST FILTER SOCK SHALL BE INSTALLED BELOW BAGS LOCATED IN HQ OR EV WATERSHEDS, WITHIN 50 FEET OF ANY

RECEIVING SURFACE WATER OR WHERE GRASSY AREA IS NOT AVAILABLE.

THE PUMP DISCHARGE HOSE SHALL BE INSERTED INTO THE BAGS IN THE MANNER SPECIFIED BY THE MANUFACTURER AND SECURELY CLAMPED. A PIECE OF PVC PIPE IS RECOMMENDED FOR THIS PURPOSE.

THE PUMPING RATE SHALL BE NO GREATER THAN 750 GPM OR 1/2 THE MAXIMUM SPECIFIED BY THE

MANUFACTURER, WHICHEVER IS LESS. PUMP INTAKES SHALL BE FLOATING AND SCREENED.

FILTER BAGS SHALL BE INSPECTED DAILY. IF ANY PROBLEM IS DETECTED, PUMPING SHALL CEASE IMMEDIATELY

AND NOT RESUME UNTIL THE PROBLEM IS CORRECTED.

PROPERTY TEST METHOD MINIMUM STANDARD

AVG. WIDE WIDTH STRENGTH ASTM D-4884 60 LB/IN

GRAB TENSILE ASTM D-4632 205 LB

PUNCTURE ASTM D-4833 110 LB

MULLEN BURST ASTM D-3786 350 PSI

UV RESISTANCE ASTM D-4355 70%

AOS % RETAINED ASTM D-4751 80 SIEVE

NOT TO SCALE

PUMPED WATER FILTER BAG DETAILA

SEEDING SPECIFICATIONS:

1. SEE SPECIFICATION 32 93 13 TOPSOIL AND SEEDING.

2. DISTURBED AREAS TO BE STABILIZED WITH VEGETATION SHALL BE SEEDED OR SODDED AS SOON AS POSSIBLE AFTER FINAL GRADING. STRAW MULCH OR EROSION CONTROL MATTING IS TO BE USED FOR PROTECTION UNTIL

VEGETATION IS ESTABLISHED.

3. SEEDING MAY BE REQUIRED UPSTREAM OF THE LIMITS OF DISTURBANCE SHOWN ON THESE PLANS. LIMITS WILL

BE DETERMINED IN THE FIELD IN CONSULTATION WITH THE ENGINEER, OWNER, AND PADEP.

4. THE RECOMMENDATIONS FOUND IN THE PADEP EROSION AND SEDIMENT POLLUTION CONTROL PROGRAM MANUAL AND PENN STATE PUBLICATION "EROSION CONTROL AND CONSERVATION PLANTING ON NONCROPLAND"

SHALL BE FOLLOWED FOR SEEDING AND RELATED ACTIVITIES.

5. FOR ALL DISTURBED AREAS NOT OTHERWISE STABILIZED WITH RIPRAP OR OTHER PERMANENT SURFACING, APPLY THE FOLLOWING SEED MIXTURES AT THE RATES SHOWN ON THIS SHEET: (NOTE: SEEDING RATE IN PURE

LIVE SEED.)

SEED MIXES AND SEEDING RATES:

NURSE CROP (TO BE USED FOR ALL AREAS TO BE SEEDED):

SPRING OATS (SPRING), OR 64 LBS/ACRE

ANNUAL RYEGRASS (SPRING OR FALL), OR 10 LBS/ACRE

WINTER WHEAT (FALL), OR 90 LBS/ACRE

WINTER RYE (FALL) 56 LBS/ACRE

SEED MIX #1: EROSION CONTROL FOR DISTURBED UPLANDS AREAS

TALL FESCUE, OR 60 LBS/ACRE

FINE FESCUE, OR 35 LBS/ACRE

KENTUCKY BLUEGRASS, 25 LBS/ACRE

PLUS, REDTOP, OR 3 LBS/ACRE

PERENNIAL RYEGRASS 15 LBS/ACRE

SEED MIX #2: SEDIMENT MANAGEMENT FOR FORMER LAKE BED

OBL-FACW PERENNIAL FOOD & COVER

WETLAND MIX (ERNST MIX #120) 20 LBS/ACRE

23% VIRGINIA WILDRYE, PA ECOTYPE

22% FOX SEDGE, PA ECOTYPE

15% LURID SEDGE, PA ECOTYPE

12% HOP SEDGE, PA ECOTYPE

7% GIANT BUR REED, PA ECOTYPE

3% GREEN BULRUSH, PA ECOTYPE

3% SOFT RUSH

2% RICE CUTGRASS, PA ECOTYPE

2% FRINGED (NODDING) SEDGE, PA ECOTYPE

2% WOOLGRASS, PA ECOTYPE

2% BLUNT BROOM SEDGE, PA ECOTYPE

SEQUENCE OF CONSTRUCTION:

THE FOLLOWING IS A GENERAL SEQUENCE OF CONSTRUCTION INTENDED AS A GENERAL OUTLINE OF THE PROJECT EARTH DISTURBANCE ACTIVITIES AND INSTALLATION OF EROSION AND SEDIMENT CONTROL MEASURES. THE CONTRACTOR MAY ADJUST THE TIMING AND SEQUENCE OF CERTAIN ACTIVITIES AS NECESSARY, PROVIDED THAT THE INTENDED EROSION CONTROL MEASURES ARE IN PLACE AND FUNCTIONAL PRIOR TO EARTH DISTURBANCE ACTIVITIES

OCCURRING.

CONSTRUCTION WILL BEGIN AFTER THE RECEIPT OF ALL NECESSARY FEDERAL, STATE, COUNTY, AND LOCAL PERMITS.

THE CONTRACTOR WILL BE RESPONSIBLE FOR ENSURING THAT ALL PERMITS HAVE BEEN OBTAINED AND THAT COPIES

ARE AVAILABLE ON THE PROJECT SITE.

ALL EARTH DISTURBANCE ACTIVITIES WILL PROCEED IN ACCORDANCE WITH THE FOLLOWING SEQUENCE. EACH STAGE WILL BE COMPLETED BEFORE ANY FOLLOWING STAGE IS INITIATED. CLEARING AND GRUBBING WILL BE

LIMITED ONLY TO THOSE AREAS DESCRIBED IN EACH STAGE.

AT LEAST 7 DAYS BEFORE STARTING ANY EARTH DISTURBANCE ACTIVITIES, THE CONTRACTOR WILL INVITE ANY AND ALL SUBCONTRACTORS INVOLVED IN THOSE ACTIVITIES, THE LANDOWNER, ALL APPROPRIATE MUNICIPAL OFFICIALS, THE EROSION AND SEDIMENT CONTROL PLAN PREPARER, THE PADEP DIVISION OF DAM SAFETY, AND THE SITE OWNER. ALSO, AT LEAST 3 DAYS BEFORE STARTING ANY EARTH DISTURBANCE ACTIVITIES, ALL CONTRACTORS INVOLVED IN THOSE ACTIVITIES SHALL NOTIFY THE PENNSYLVANIA ONE CALL SYSTEM INCORPORATED AT

1-800-242-1776 FOR BURIED UTILITY LOCATIONS.

1. DELINEATE THE APPROVED LIMITS OF DISTURBANCE WITH SURVEY STAKES AND FLAGS OR WITH ORANGE CONSTRUCTION FENCING. NO EARTH DISTURBANCE ACTIVITIES WILL BE PERFORMED OUTSIDE OF THE

APPROVED LIMITS OF DISTURBANCE.

2. INSTALL STABILIZED CONSTRUCTION ENTRANCE AT THE LOCATION INDICATED ON THE APPROVED E&S PLANS.

3. INSTALL COMPOST FILTER SOCK SEDIMENT BARRIERS AND SILT FENCING DOWNSLOPE OF THE WORK AREA AS INDICATED ON THE E&S PLANS. COMPOST FILTER SOCKS AND SILT FENCES WILL BE INSTALLED AND ANCHORED

ACCORDING TO THE MANUFACTURER'S SPECIFICATIONS AND DETAILS.

4. REMOVE VEGETATION AND BRUSH AS REQUIRED TO CREATE THE VEHICULAR ACCESS FROM THE CONTRACTOR

LAYDOWN AND STAGING AREA TO THE WORK AREA.

5. CONTRACTOR MAY OPTIONALLY PLACE TEMPORARY RIPRAP UNDER THE ROUTE 1 BRIDGE AS REQUIRED TO

ACCESS THE WORK AREA.

6. INSTALL FENCING AND SIGNAGE AS INDICATED ON THESE PLANS TO RESTRICT PUBLIC ACCESS TO WALKING

TRAILS THROUGH THE WORK AREA AND THE CONTRACTOR LAYDOWN AND STAGING AREA.

7. REMOVE THE DAM STARTING FROM THE RIGHT SIDE AND PROGRESSING LEFT.

8. PLACE REMOVED MASONRY AS SHOWN ON THESE PLANS, ALONG THE LEFT AND RIGHT BANKS OF THE CREEK.

9. REGRADE THE CREEK BED AS SHOWN ON THE PLANS.

10. WHEN DEMOLITION, GRADING, AND BANK RESTORATION ARE COMPLETE AND THE SITE IS STABILIZED, THE CONTRACTOR WILL REMOVE ALL REMAINING TEMPORARY EROSION AND SEDIMENT CONTROL BMP'S.

NOTES:

FABRIC SHALL HAVE THE MINIMUM PROPERTIES AS SHOWN IN TABLE 4.3 OF THE PA DEP EROSION

CONTROL MANUAL.

FABRIC WIDTH SHALL BE 30 IN. MINIMUM. STAKES SHALL BE HARDWOOD OR EQUIVALENT STEEL (U OR T)

STAKES.

SILT FENCE SHALL BE PLACED AT LEVEL EXISTING GRADE. BOTH ENDS OF THE FENCE SHALL BE

EXTENDED AT LEAST 8 FEET UP SLOPE AT 45 DEGREES TO THE MAIN FENCE ALIGNMENT.

SEDIMENT SHALL BE REMOVED WHEN ACCUMULATIONS REACH HALF THE ABOVE GROUND HEIGHT OF THE

FENCE.

ANY SECTION OF SILT FENCE WHICH HAS BEEN UNDERMINED OR TOPPED SHALL BE IMMEDIATELY

REPLACED WITH A ROCK FILTER OUTLET (STANDARD CONSTRUCTION DETAIL # 4-6).

FENCE SHALL BE REMOVED AND PROPERLY DISPOSED OF WHEN TRIBUTARY AREA IS PERMANENTLY

STABILIZED.

NOT TO SCALE

SILT FENCED

W

ET

W

ET

W

ET

W

ET

W

ET

WET

W

ET

W

ET

W

ET

WET

W

ET

W

ET

W

ET

W

ET

W

ET

WET

WET

WET

W

ET

W

ET

W

ET

W

ET

25 FT

10 FT

10 FT 25 FT

F

T

IT IS A VIOLATION OF LAW FOR ANY PERSON, UNLESS

ACTING UNDER THE DIRECTION OF A LICENSED ENGINEER,

TO ALTER THIS DOCUMENT.

THIS DRAWING WAS PREPARED AT THE SCALE INDICATED. INACCURACIES IN THE STATED SCALE MAY BE INTRODUCED WHEN DRAWINGS ARE REPRODUCED BY ANY MEANS. USE THE GRAPHIC SCALE BAR TO DETERMINE THE ACTUAL SIZE. DRAWING IS NOT SCALABLE IF NO SCALE BAR IS

PRESENT.

NO. DATE REVISION INT.C:

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RAMBOLL AMERICAS ENGINEERING SOLUTIONS, INC.

SHEET DESCRIPTIONPROJECT

ADDRESS

PROJECT NO.

DATE

DESIGNER / PROFESSIONAL ENGINEER RESPONSIBLE

DRAWN BY

CHECKED BY

CLIENT

C-4

CONSTRUCTION ACCESS PLANHOFFMAN'S MILL DAM REMOVAL

1 HOFFMAN'S MILL ROAD

CHADDS FORD, PA 19317

BRANDYWINE CONSERVANCY &

MUSEUM OF ART 1180923.1940109512

01/08/2024

KENNETH CATINO, P.E.

K. GRIM

CHADDS FORD, PA 19317

ATTENTION ALL CONTRACTORS: LOCATIONS OF ALL EXISTING

UTILITIES SHOWN HEREON HAVE BEEN DEVELOPED FROM

UTILITY COMPANY RECORDS AND/OR ABOVE-GROUND

INSPECTION OF THE SITE. COMPLETENESS OR ACCURACY OF

TYPE, SIZE, DEPTH OR HORIZONTAL LOCATION OF

UNDERGROUND FACILITIES OR STRUCTURES CANNOT BE

GUARANTEED. PURSUANT TO REQUIREMENTS OF

PENNSYLVANIA LEGISLATIVE ACT NUMBER 287 OF 1974 AS

AMENDED BY ACT 121 OF 2008, CONTRACTORS MUST VERIFY

LOCATION AND DEPTH OF ALL UNDERGROUND UTILITIES AND

FACILITIES PRIOR TO START OF WORK.

015' 15'

CONSTRUCTION ACCESS PLAN

1"=15'-0"

NORTH

BRANDYWINE CREEK

U.S. ROUTE 1

U.S. ROUTE 1

HISTORIC MILL RACE

CROSSING:

CONTRACTOR TO

AVOID IMPACTS TO

WETLAND; SEE NOTE 1,

BELOW.

CONTRACTOR TO USE TIMBER

MATS TO CROSS WETLAND;

RESTORE WETLAND TO

PRE-CONSTRUCTION

CONDITIONS FOLLOWING

CONSTRUCTION

U.S. ROUTE 1 BRIDGE

PENNSBURY TOW

NSHIP

CHADDS FORD TOW

NSHIP

HOFFMAN'S MILL DAM

COLUMBIA GAS TRANSMISSION

20-IN. DIA. HIGH PRESSURE GAS

PIPELINE

SEE UTILITY NOTES ON SHEET

C-6

10-FT MIN. OFFSET

BETWEEN LOD AND

PIPELINE CENTERLINE

7-FT MIN. OFFSET

BETWEEN LOD AND

PIPELINE CENTERLINE

COLUMBIA GAS TRANSMISSION

RIGHT-OF-WAY

25-FOOT OFFSET FROM

PIPELINE CENTERLINE

OVERHEAD PECO GAS LINE

LOCATED BETWEEN BRIDGE

GIRDERS

LOCATION APPROXIMATE; SEE

UTILITY NOTES ON SHEET C-6

CONTRACTOR SHALL NOT

DISTURB BRIDGE PIER

REMOVE WOODEN SPLIT RAIL

FENCE FOR EQUIPMENT

ACCESS; FENCE MUST BE

REPLACED IN KIND AT

COMPLETION OF PROJECT

REMOVE EXISTING STONE STEPS AT THIS

LOCATION AND PLACE THEM IN A STORAGE

AREA AS SPECIFIED BY BRANDYWINE

CONSERVANCY; STEPS WILL NOT BE REPLACED

FOLLOWING CONSTRUCTION

REMOVE SECTION OF CHAINLINK FENCE IF

NECESSARY FOR ACCESS. CONTRACTOR

SHALL DISPOSE OF REMOVED FENCE MATERIAL

OFF-SITE.

PENNDOT

RIGHT-OF-WAY

PENNDOT

RIGHT-OF-WAY

AVOID UTILITY POLE

OVERHEAD ELECTRICAL

CONDUITS LOCATED BETWEEN

BRIDGE GIRDERS

LOCATION APPROXIMATE; SEE

UTILITY NOTES ON SHEET C-6

NO EQUIPMENT MAY TRAVERSE

LOD WITHIN 50-FOOT PIPELINE

RIGHT-OF-WAY WITHOUT

MATTING (AT LEAST

COMPOSITE MATS). EQUIPMENT

MAY NOT BE PARKED IN THIS

AREA AT ANY TIME. SEE NOTES

ON SHEET C-6.

NO EQUIPMENT MAY TRAVERSE

LOD WITHIN 50-FOOT PIPELINE

RIGHT-OF-WAY WITHOUT

MATTING (AT LEAST

COMPOSITE MATS). EQUIPMENT

MAY NOT BE PARKED IN THIS

AREA AT ANY TIME. SEE NOTES

ON SHEET C-6.

OHWM

OHWM

NOTES:

1. CONTRACTOR SHALL ENSURE PROTECTION OF THE HISTORIC MILL RACE AND ASSOCIATED

WETLAND HABITAT WHILE USING THE SITE ACCESS. PROTECTION MEASURES SUCH AS TIMBER MATS

MAY BE USED.

LO

D

LO

D

LO

D

LO

D

LO

D

LO

D

LOD LOD LOD

LO

D

LO

D

LO

D

LO

D

LO

D

LO

D

LOD

LOD

LOD

LOD

LOD

LOD

LOD

LOD

LOD

LOD

LOD

LOD

LOD

LOD

LOD

LOD

LO

D

LO

D

LO

D

LO

D

LODLOD

LO

D

LO

D

LO

D

LO

D

LO

D

LO

D

LO

D

LO

D

LOD

LO

D

LO

D

LOD

LOD

LOD

LOD

LOD LOD LOD LOD LOD LOD LOD LOD LOD LOD LOD

LO

D

LO

D

LO

D

LO

D

LO

D

LO

D

W

ET

W

ET

W

ET

W

ET

W

ET

W

ET

W

ET

W

ET

W

ET

165' +/-

80' +/-

WET WET WET WET

PROPOSED MINOR CONTOUR

PROPOSED MAJOR CONTOUR

EXISTING MINOR CONTOUR

EXISTING MAJOR CONTOUR

PROPERTY LINE

EDGE OF WATER/STREAM/POND

TREE LINE

WETLANDS

DEMOLITION/REMOVAL AREA

EXISTING RIPRAP/STONE

PROPOSED RIPRAP/STONE

ORDINARY HIGH WATER MARK

IT IS A VIOLATION OF LAW FOR ANY PERSON, UNLESS

ACTING UNDER THE DIRECTION OF A LICENSED ENGINEER,

TO ALTER THIS DOCUMENT.

THIS DRAWING WAS PREPARED AT THE SCALE INDICATED. INACCURACIES IN THE STATED SCALE MAY BE INTRODUCED WHEN DRAWINGS ARE REPRODUCED BY ANY MEANS. USE THE GRAPHIC SCALE BAR TO DETERMINE THE ACTUAL SIZE. DRAWING IS NOT SCALABLE IF NO SCALE BAR IS

PRESENT.

NO. DATE REVISION INT.C:

\D

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AC

CD

OC

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RA

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OL

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OF

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MI

LL

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AM

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OV

AL

\P

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EL

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D:

6/

/26

:09 P

M

RAMBOLL AMERICAS ENGINEERING SOLUTIONS, INC.

SHEET DESCRIPTION

DRAWING LOCATION

PROJECT

ADDRESS

PROJECT NO.

DATE

DESIGNER / PROFESSIONAL ENGINEER RESPONSIBLE

DRAWN BY

CHECKED BY

CLIENT

C-5

DEMOLITION & GRADING PLANHOFFMAN'S MILL DAM REMOVAL

1 HOFFMAN'S MILL ROAD

CHADDS FORD, PA 19317

BRANDYWINE CONSERVANCY &

MUSEUM OF ART 1180923.1940109512

01/08/2024

KENNETH CATINO, P.E.

K. GRIM

CHADDS FORD, PA 19317

EAST PENN RAILROAD

RING RUN OUTLET

BOX CULVERT

U.S. ROUTE 1 BRIDGE

WALKING TRAIL

U.S. ROUTE 1 BRIDGE

(EDGE OF DECK)

BRANDYWINE CREEK

C-6

1C-6

C-6

EDGE OF WATER

(VARIES)

EDGE OF WATER

(VARIES)

EDGE OF WATER

(VARIES)

BRIDGE PIER

BRIDGE PIER

BRIDGE PIER

030' 30'

GRADING PLAN

1"=30'-0"

NORTH

PLACEMENT AREA FOR

ROCK MATERIAL

EXCAVATED FROM DAMPLACEMENT AREA FOR

ROCK MATERIAL

EXCAVATED FROM DAM

EASTERN DAM ABUTMENT

TO REMAIN IN PLACE

PENNSBURY TOWNSHIP

CHADDS FORD TOWNSHIP

HOFFMAN'S MILL DAM

(TO BE REMOVED)

C-6

COLUMBIA GAS TRANSMISSION

20-IN. DIA. HIGH PRESSURE GAS

PIPELINE

SEE UTILITY NOTES ON SHEET

C-6

C-6

DCNR SIGN, SEE DETAIL 7,

SHEET C-6

EXACT LOCATION TO BE

SPECIFIED BY OWNER

OHWM

OHWM

OHWM

OHWM

TREE REMOVAL MAY BE NECESSARY

IN THIS AREA, SEE NOTES 6 (DAM

REMOVAL) AND 4 (RARE,

THREATENED, AND ENDANGERED

SPECIES) ON SHEET C-6

TREE REMOVAL MAY BE NECESSARY

IN THIS AREA, SEE NOTES 6 (DAM

REMOVAL) AND 4 (RARE,

THREATENED, AND ENDANGERED

SPECIES) ON SHEET C-6

COLUMBIA GAS TRANSMISSION

RIGHT-OF-WAY

25-FOOT OFFSET FROM

PIPELINE CENTERLINE

DAM WIDTH VARIES

+/- 13-FT TO 18-FT

ELEVATIO

N EL

EV

AT

IO

N

STATION

0+00 0+25 0+50 0+75 1+00 1+25

ELEVATIO

N EL

EV

AT

IO

N

STATION

0+00 0+25 0+50

ELEVATIO

N EL

EV

AT

IO

N

STATION

0+00 0+25 0+50 0+75 1+00 1+25 1+50 1+75 2+00 2+25 2+50 2+75 3+00 3+15

ELEVATIO

N EL

EV

AT

IO

N

STATION

0+00 0+25 0+50

HOFFMAN'S MILL DAM

REMOVAL PROJECT

BRANDYWINE CONSERVANCY

Funding assistance has been provided by the:

DEPARTMENT OF CONSERVATION AND NATURAL RESOURCES

COMMUNITY CONSERVATION PARTNERSHIP PROGRAM,

NATIONAL FISH AND WILDLIFE FOUNDATION,

PENNSBURY TOWNSHIP, AND

CHADDS FORD TOWNSHIP

IT IS A VIOLATION OF LAW FOR ANY PERSON, UNLESS

ACTING UNDER THE DIRECTION OF A LICENSED ENGINEER,

TO ALTER THIS DOCUMENT.

THIS DRAWING WAS PREPARED AT THE SCALE INDICATED. INACCURACIES IN THE STATED SCALE MAY BE INTRODUCED WHEN DRAWINGS ARE REPRODUCED BY ANY MEANS. USE THE GRAPHIC SCALE BAR TO DETERMINE THE ACTUAL SIZE. DRAWING IS NOT SCALABLE IF NO SCALE BAR IS

PRESENT.

NO. DATE REVISION INT.C:

\D

C\

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CD

OC

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L G

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A S\

RU

S-

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OF

FM

AN

S

MI

LL

D

AM

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EM

OV

AL

\P

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CT

F

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S\ 4 D

EL

IV

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IP

\40

1 C

IV

IL\

DR

AW

IN

GS

\19

-C -6

-B

ID

.D W

G

SA

VE

D:

6/

/26

:15 P

M

RAMBOLL AMERICAS ENGINEERING SOLUTIONS, INC.

SHEET DESCRIPTION

DRAWING LOCATION

PROJECT

ADDRESS

PROJECT NO.

DATE

DESIGNER / PROFESSIONAL ENGINEER RESPONSIBLE

DRAWN BY

CHECKED BY

CLIENT

C-6

PROFILES SECTIONS DETAILS & NOTESHOFFMAN'S MILL DAM REMOVAL

1 HOFFMAN'S MILL ROAD

CHADDS FORD, PA 19317

BRANDYWINE CONSERVANCY &

MUSEUM OF ART 1180923.1940109512

01/08/2024

KENNETH CATINO, P.E.

K. GRIM

NOT TO SCALE

ROCK PLACEMENT DETAIL

1 HOFFMAN'S MILL ROAD, P.O. BOX 141

CHADDS FORD, PA 19317

EXISTING GRADE

FLOW

WOODEN CRIBBING

SEE NOTE BELOW

BOULDER DAM FACE

DAM CONSTRUCTION

BELOW DAM FACE

UNKNOWN

SEE NOTE BELOW

NOTES:

1. LIMITED PORTIONS OF WOODEN CRIBBING ARE VISIBLE NEAR THE DOWNSTREAM TOE OF THE DAM. CONTRACTOR SHOULD ANTICIPATE POSSIBLE PRESENCE OF CRIBBED CELLS DURING DEMOLITION AND COORDINATE THE DISPOSAL OR

DISPOSITION OF WOODEN DEBRIS WITH THE DAM OWNER.

2. NO DESIGN INFORMATION, DRAWINGS, OR HISTORICAL DATA PERTAINING TO THE DESIGN AND CONSTRUCTION OF THE DAM IS KNOWN TO EXIST. THEREFORE, KNOWLEDGE OF THE DAM IS LIMITED TO VISUAL OBSERVATION.

04' 4'

DAM SECTION (TYP.)

1"=4'-0"

C-5

FLOW

020' 20'

LEFT BANK SECTION

1"=20'-0"

C-5

020' 20'

SECTION

1"=20'-0"

C-5

020' 20'

PROFILE

1"=20'-0"

C-5

EXISTING GRADE

PROPOSED GRADE

EXISTING GRADE

PROPOSED GRADE

EXISTING GRADE

PROPOSED GRADE

APPROX. 2H:1V

EXIST. DAM BREACH

SEE SECTION 3, ABOVE

020' 20'

RIGHT BANK SECTION

1"=20'-0"

C-5

EXISTING GRADE

PROPOSED GRADE

APPROX. 3H:1V

ROCK PLACED TO DIMENSIONS

SHOWN ON SECTIONS, THIS SHEET

EXISTING GRADE

ROCK FILL USING

RELOCATED DAM MATERIALS

SEE DETAIL 6, THIS SHEET

ROCK FILL USING

RELOCATED DAM MATERIALS

SEE DETAIL 6, THIS SHEET

EL 170.5

100-YR WSE (EXIST. AND PROP.)

EL 167.9

50-YR WSE (EXIST. AND PROP.)

EL 164.5

10-YR WSE (EXIST. AND PROP.)

NOTES

GENERAL NOTES:

1. ALL CONSTRUCTION WORK SHALL BE COMPLETED IN ACCORDANCE WITH THE APPLICABLE FEDERAL, STATE AND LOCAL CODES AND ALL REGULATIONS APPURTENANT TO LATEST VERSIONS OF THE OCCUPATIONAL SAFETY AND HEALTH ACT. CONSTRUCTION WORK SHALL BE IN ACCORDANCE WITH PROJECT SPECIFICATIONS INCLUDING CURRENT APPLICABLE CONSTRUCTION STANDARDS, THE LATEST REVISIONS OF BOCA BUILDING AND APPLICABLE BUILDING CODES. CONTRACTOR IS RESPONSIBLE FOR OBTAINING ALL BUILDING & DEMOLITION PERMITS REQUIRED BY LOCAL CODES PRIOR TO THE START OF WORK. WHERE ANY STANDARD SEEMS IN CONFLICT WITH THESE DRAWINGS, NOTIFY THE ENGINEER FOR DIRECTION BEFORE PROCEEDING

WITH CONSTRUCTION.

2. PROPER TEMPORARY BRACING AND SHORING OF ALL CONSTRUCTION WORK IN PROGRESS IS THE RESPONSIBILITY OF THE

CONTRACTOR.

3. THE CONTRACTOR IS RESPONSIBLE FOR EXAMINING THE SITE AND VERIFYING CONTROLLING PHYSICAL CONDITIONS, CONSTRUCTION DATA AND UTILITIES.

4. ALL DIMENSIONS MUST BE VERIFIED BY THE CONTRACTOR.

5. LAYOUT, LINE AND GRADE ARE THE RESPONSIBILITY OF THE CONTRACTOR UNLESS OTHERWISE NOTED.

6. DO NOT SCALE DRAWINGS. SECTIONS AND DETAILS SHOWN ON DRAWINGS ARE TYPICAL. USE SIMILAR CONSTRUCTION AT

LOCATIONS NOT SPECIFICALLY DETAILED.

7. ANY DISCREPANCIES WITHIN THE DRAWINGS, SPECIFICATIONS, CODES OR STANDARDS SHALL BE BROUGHT TO THE ATTENTION

OF THE ENGINEER FOR CORRECTIVE ACTION PRIOR TO START OF CONSTRUCTION.

8. FIELD CHANGES TO THE DAM REMOVAL REQUIRE PRIOR ENGINEERING REVIEW AND WRITTEN CONFIRMATION.

9. CONSTRUCTION SAFETY, PROCEDURES, MEANS AND METHODS, SEQUENCING, AND COORDINATION ARE THE RESPONSIBILITY

OF THE CONTRACTOR.

10. THE BRANDYWINE MUSEUM OF ART CAMPUS WILL REMAIN OPEN DURING CONSTRUCTION. THE GROUNDS AND TRAILS ARE OPEN TO THE PUBLIC. THE CONTRACTOR SHALL TAKE MEASURES TO ENSURE THE SAFETY OF THE PUBLIC IN THE VICINITY OF THE

PROJECT AREA.

11. THE CONTRACTOR IS RESPONSIBLE FOR PROVIDING SIGNAGE AND EXCLUSION FENCING AT TRAIL CROSSINGS WHERE SHOWN

ON THIS DRAWING SET.

BRANDYWINE CREEK NOTES:

1. 10, 50, AND 100-YEAR FLOWS SHOWN ON THIS SHEET BASED ON FEMA FLOOD INSURANCE STUDY FOR CHESTER COUNTY, PENNSYLVANIA, REVISED SEPTEMBER 29, 2017.

2. MEDIAN FLOW SHOWN BASED ON AN ANALYSIS OF USGS GAGE 01481000 BRANDYWINE CREEK AT CHADD'S FORD, PA, BASED ON

THE DATA RANGE OCTOBER 1, 2017 THROUGH JANUARY 1, 2025.

3. DRAINAGE AREA TO THE PROJECT SITE IS 285 SQUARE MILES.

4. THE MEDIAN FLOW AT THE PROJECT SITE IS APPROXIMATELY 320 CFS.

5. BRANDYWINE CREEK FLOW AND WATER SURFACE ELEVATION DATA IS AVAILABLE FROM USGS GAGE 01481000 BRANDYWINE CREEK AT CHADDS FORD, PA. THE GAGE IS LOCATED DOWNSTREAM OF THE SITE AT THE BRANDYWINE MUSEUM OF ART.

6. THE CONTRACTOR SHALL BE AWARE THE PROJECT LOCATION IS PRONE TO SIGNIFICANT FLOODING, AND SHALL MONITOR WEATHER CONDITIONS ACCORDINGLY. IN THE EVENT OF POSSIBLE HIGH FLOWS, EQUIPMENT SHOULD BE MOVED OUT OF THE WORK AREA AND THE SITE STABILIZED PRIOR TO THE ARRIVAL OF STORM FLOWS. THE LAYDOWN AREA IS ALSO SUBJECT TO

FLOODING DURING EXTREME EVENTS.

UTILITIES:

1. CONTRACTOR IS ULTIMATELY RESPONSIBLE FOR PERFORMING THE WORK IN A SAFE MANNER AROUND UNDERGROUND AND

ABOVEGROUND UTILITIES.

2. CONTRACTOR SHALL CONTACT PA 1 CALL PRIOR TO ALL DIGGING AND EARTH DISTURBING ACTIVITIES.

3. A 20-INCH HIGH PRESSURE GAS PIPELINE IS PRESENT IN THE PROJECT VICINITY. REFER TO THE PLAN SHEETS, AS WELL AS FIELD MARKOUTS, FOR THE PIPELINE CENTERLINE. THE PIPELINE RIGHT-OF-WAY EXTENDS 25 FEET FROM THE CENTERLINE ON

EACH SIDE.

4. THE PIPELINE IS OWNED AND OPERATED BY COLUMBIA GAS TRANSMISSION CORPORATION. CONTACT 1-800-835-7191 OR 811. IN

THE EVENT OF AN EMERGENCY, IMMEDIATELY DIAL 911.

5. WHERE THE LIMITS OF DISTURBANCE ARE WITHIN THE 50-FOOT PIPELINE RIGHT-OF-WAY, THE CONTRACTOR MUST PROVIDE MATTING FOR EQUIPMENT TO DRIVE ON. STEEL PLATES, TIMBER MATS, OR COMPOSITE MATS ARE ACCEPTABLE. AT NO TIME

MAY EQUIPMENT BE PARKED IN THIS AREA.

6. CONTRACTOR SHALL NOT PARK VEHICLES ABOVE OR CROSS THE PIPELINE WITHOUT EXPLICIT PERMISSION FROM COLUMBIA

GAS TRANSMISSION CORPORATION.

7. CONTRACTOR SHALL NOT EXCAVATE OR CAUSE EARTH DISTURBANCE WITHIN THE PIPELINE RIGHT-OF-WAY.

8. CONSTRUCTION EQUIPMENT STORED AT THE DAM MUST BE STORED WITHIN THE LIMITS OF DISTURBANCE SHOWN ON THESE

DRAWINGS.

9. LOCATIONS OF ELECTRICAL CONDUITS AND PECO GAS LINE LOCATED ABOVEGROUND IN ROUTE 1 BRIDGE GIRDERS ARE

APPROXIMATE, BASED ON FIELD OBSERVATIONS.

PENNDOT :

1. THE ROUTE 1 BRIDGE IS PROPERTY OF PENNDOT AND SUBJECT TO ALL PENNDOT REQUIREMENTS AND RESTRICTIONS.

2. THE CONTRACTOR SHALL NOT MAKE ANY PERMANENT ALTERATIONS WITHIN THE PENNDOT RIGHT-OF-WAY SHOWN ON THESE DRAWINGS. ANY TEMPORARY IMPACTS SHALL BE RESTORED TO EXISTING CONDITIONS FOLLOWING CONSTRUCTION.

3. CONTRACTOR ACCESS TO THE PROJECT IS UNDERNEATH THE ROUTE 1 BRIDGE. ACCESS TO THE SITE IS VIA HOFFMAN'S MILL ROAD, OFF OF ROUTE 1. AT NO TIME WILL THE CONTRACTOR CROSS ROUTE 1 OR ACCESS ROUTE 1, EXCEPT VIA HOFFMAN'S

MILL ROAD.

DAM REMOVAL:

1. SUBSURFACE DAM GEOMETRY IS UNKNOWN, AS NO HISTORICAL DESIGN DOCUMENTATION IS KNOWN TO EXIST. CROSS SECTIONS SHOWN IN THIS DRAWING SET ARE FOR ILLUSTRATIVE PURPOSES ONLY. IF THE STRUCTURE GEOMETRY VARIES

SIGNIFICANTLY FROM THE CROSS SECTIONS SHOWN ON THIS PLAN, CONTACT THE ENGINEER.

2. THE BREACH DESIGN CALLS FOR REMOVING DAM MATERIAL TO EL 152. IF THE BOTTOM OF THE DAM IS FOUND TO BE ABOVE EL 152, REMOVE THE ENTIRE STRUCTURE AND CREEK BED MATERIAL TO ACHIEVE FINAL GRADE AT EL 152.

2.1. IF THE BOTTOM OF THE DAM IS FOUND TO BE BELOW EL 152, REMOVE MATERIAL TO EL 150 AND BACKFILL TO EL 152, LEAVING THE PORTION OF THE STRUCTURE BELOW EL 150 IN PLACE.

2.2. IF THE BOTTOM OF THE DAM IS FOUND TO BE BELOW EL 152 AND ABOVE EL 150, REMOVE THE ENTIRE STRUCTURE AND

GRADE THE CREEK BED TO ACHIEVE FINAL GRADE AT EL 152.

3. DUE TO NATURAL BED MOVEMENTS IN RIPARIAN CONDITIONS, THE EXISTING CONTOURS SHOWN IN THIS PLAN SET MAY VARY

AT THE TIME OF CONSTRUCTION.

4. GIVEN THE UNKNOWN DAM GEOMETRY, DEVIATION FROM THE FINAL GRADE SHOWN ON THESE PLAN SHEETS IS PERMISSIBLE, WHEN COORDINATED WITH THE OWNER AND ENGINEER. THE FINAL GRADE THROUGH THE BREACH AREA SHALL NOT BE HIGHER

THAN EL 152, AND SHALL NOT BE LOWER THAN THE UPSTREAM AND DOWNSTREAM GRADES.

5. THE FINAL GRADE THROUGH THE BREACH AREA SHALL PROVIDE A SMOOTH TRANSITION FROM UPSTREAM TO DOWNSTREAM, AND SHALL CONVEY WATER IN A SMOOTH MANNER DOWNSTREAM WITHOUT ENCOURAGING FLOWS TOWARD EITHER CREEK

BANK, OR THE ROUTE 1 BRIDGE PIERS.

6. TREE REMOVAL IS ANTICIPATED ON THE DAM ITSELF AND AT THE LEFT AND RIGHT STREAM BANK MATERIAL PLACEMENT AREAS.

TREE REMOVAL SHALL BE LIMITED TO THE MINIMUM REQUIRED IN ORDER TO MEET THE DESIGN INTENT.

7. THE CONTRACTOR SHALL COMPLETE FINAL GRADING SUCH THAT THE CREEK BED IS FREE OF ROCKS, COBBLES, AND

BOULDERS WHICH COULD PRESENT A HAZARD TO RECREATIONAL BOATERS.

8. LARGE LOGS REMOVED FROM THE DAM SHALL BE RELOCATED AND DISPOSED OF ON THE BRANDYWINE MUSEUM OF ART

CAMPUS, AT A LOCATION OR LOCATIONS CHOSEN BY THE OWNER.

9. ANY WOODEN CRIBBING FOUND DURING DEMOLITION SHALL BE RELOCATED AND DISPOSED OF ON THE BRANYWINE MUSEUM

OF ART CAMPUS, AT A LOCATION OR LOCATIONS CHOSEN BY THE OWNER.

10. TO THE GREATEST EXTENT PRACTICABLE, NOTIFY THE OWNER AND ENGINEER UPON ENCOUNTERING POSSIBLE HISTORICAL ARTIFACTS AND AVOID DISTURBING, DAMAGING, OR RELOCATING SUCH MATERIALS UNTIL THE OWNER AND ENGINEER ARE

CONSULTED.

11. OWNER MAY ELECT TO RESERVE A PORTION OF THE DAM ROCK MATERIAL FOR REUSE ON THE CAMPUS. MATERIAL SELECTED FOR THIS PURPOSE BY THE OWNER SHALL BE TRANSPORTED AND STORED AT THE CONTRACTOR'S LAYDOWN AREA.

RARE, THREATENED, AND ENDANGERED SPECIES:

1. THE NORTHERN RED-BELLIED COOTER IS KNOWN TO INHABIT THE PROJECT AREA. INSTREAM WORK SHALL BE LIMITED TO

BETWEEN APRIL 15TH AND OCTOBER 15TH OF THE CALENDAR YEAR.

2. LOW QUALITY BOG TURTLE HABITAT IS PRESENT NEAR THE PROJECT AREA. INSTALL SILT FENCING TO THE EXTENTS SHOWN ON

SHEET C-2 AS A PRECAUTIONARY EXCLUSION MEASURE.

3. ROTALA RAMOSIOR (TOOTH-CUP) HAS HISTORICALLY BEEN OBSERVED IMMEDIATELY NORTH OF THE PROJECT AREA.

CONTRACTOR SHALL AVOID ANY IMPACTS TO THIS AREA, AS DELINEATED ON SHEET C-2.

4. TREE REMOVAL IS FORBIDDEN BETWEEN MAY 15 AND JULY 31 DUE TO POSSIBLE INDIANA BAT (MYOTIS SODALIS) AND

TRICOORED BAT (PERIMYOTIS SUBFLAVUS) ROOSTING HABITAT.

NOTES:

1. CLEAR VEGETATION AND DEBRIS PRIOR TO ROCK PLACEMENT TO ALLOW FOR DIRECT CONTACT

BETWEEN ROCK AND EXISTING GRADE.

2. AS PRACTICABLE, PLACE SMALLER STONE COBBLES AND ROCKS ON THE BANK FIRST AND TOP WITH

LARGER STONES.

EL 153.3

EXIST. MEDIAN FLOW

EL 153.0

PROP. MEDIAN FLOW

EL 170.5

100-YR WSE (EXIST. AND PROP.)

EL 167.9

50-YR WSE (EXIST. AND PROP.)

EL 164.5

10-YR WSE (EXIST. AND PROP.)

EL 153.3

EXIST. MEDIAN FLOW

EL 153.0

PROP. MEDIAN FLOW

PROPOSED GRADE

APPROX. 2H:1V

PROPOSED GRADE

APPROX. 3H:1V

H:

V: 1"=10'-0"

H:

V: 1"=10'-0" H:

V: 1"=10'-0" H:

V: 1"=10'-0"

KEY IN ROCK

FILL AT TOE OF

SLOPE

8" TYP.

02' 2'

C-5

DCNR SIGN AND INSTALLATION

NOTES:

1. ALL TEXT SHALL BE TIMES NEW ROMAN, TEXT HEIGHTS AS SHOWN ABOVE, RAISED 1

16"

2. OWNER TO PROVIDE VECTOR-BASED LINE ART FOR…