Appendix_B_Dredging_Drawings.pdf

GILBERT RUN LAKE

WHEATLEY DAM

OVERFLOW STRUCTURE

AMBERLEIGH PL

CRESCENT RUN ST

GILBERT RUN LAKE DREDGING

CHARLES COUNTY DEPARTMENT

OF PUBLIC WORKS

13140 CHARLES STREET

CHARLOTTE HALL, MD 20622

MAP: 57, GRID 0008, PARCEL: 0087

PROJECT NARRATIVE

THE PROJECT IS LOCATED AT THE GILBERT RUN LAKE IN CHARLOTTE HALL, CHARLES COUNTY, MARYLAND. THE EXISTING PROJECT SITE IS THE GILBERT RUN LAKE RESERVOIR LOCATED UPSTREAM OF THE WHEATLEY DAM.

THE PROPOSED DRAWING SET PRESENTS POTENTIAL EXTENTS FOR DREDGING OF THE SOUTHWESTERN AND NORTHERN PORTIONS OF THE LAKE. WETLANDS ARE PRESENT ADJACENT TO THE PROPOSED DREDGING AREAS. NO WETLAND DISTURBANCE IS PROPOSED AS PART OF THIS PROJECT. APPROXIMATELY 0.78 OF LAND

AREA IS TO BE UTILIZED IN THE SCOPE OF THIS PROJECT.

POTENTIAL DREDGING OF THE GILBERT RUN LAKE SHALL CONFORM TO THE FOLLOWING SEQUENCE OF CONSTRUCTION. CONTRACTOR TO NOTIFY ENGINEER AND CHARLES COUNTY TO SEEK APPROVAL FOR PROPOSED DEVIATIONS. REFERENCED LOCATIONS ARE AVAILABLE THROUGHOUT THIS PLAN SET.

CONTRACTOR TO ERECT TYPE II TURBIDITY CURTAIN PRIOR TO ALL DREDGING ACTIVITY AS NOTED.

DREDGING BARGE TO ENTER GILBERT RUN LAKE VIA GILBERT RUN BOAT RAMP AS NOTED. DREDGING BARGE THEN SHALL MOVE TO DREDGING EXTENT AREA. DREDGING TO OCCUR WITHIN EXTENTS AS NOTED.

DREDGED MATERIAL SHALL BE TRANSPORTED OUT OF GILBERT RUN LAKE VIA GILBERT RUN BOAT RAMP.

DREDGED MATERIAL SHALL BE DEPOSITED IN SPECIFIED DEWATERING AREAS AS NOTED. DREDGED MATERIAL SHALL BE ALLOWED TO DRY COMPLETELY PRIOR TO BEING TRANSPORTED OFFSITE VIA CONSTRUCTION

ENTRANCE ROAD AS NOTED.

1. ALL WORK SHALL BE IN ACCORDANCE WITH THE LATEST CHARLES COUNTY

DEPARTMENT OF PLANNING AND GROWTH MANAGEMENT SPECIFICATIONS

MANUAL, THE LATEST CHARLES COUNTY DETAIL MANUAL AND IN ACCORDANCE

WITH ALL COUNTY ORDINANCES.

2. THE CONTRACTOR SHALL FURNISH, INSTALL, TEST AND COMPLETE ALL WORK

TO THE SATISFACTION OF THE ENGINEER AND OWNER IN ACCORDANCE WITH

THE CONTRACT DOCUMENTS. THE CONTRACTOR IS SOLELY RESPONSIBLE FOR

MEANS AND METHODS OF DREDGING; AS SUCH, THESE PLANS DO NOT

COMPLETELY REPRESENT, NOR ARE THEY INTENDED TO REPRESENT, ALL

SPECIFIC INSTRUCTIONS REQUIRED FOR SITEWORK DREDGING. THE

CONTRACTOR IS RESPONSIBLE TO CONSTRUCT ALL IMPROVEMENTS DEPICTED

ON THESE PLANS IN ACCORDANCE WITH ALL APPLICABLE RULES, REGULATIONS

AND LAWS IN EFFECT AT THE TIME OF DREDGING.

3. THE CONTRACTOR SHALL ACCEPT THE SITE AS IS. THE CONTRACTOR SHALL

ASSESS CONDITIONS, AND THE KIND, QUALITY AND QUANTITY OF WORK

REQUIRED. THE OWNER AND ENGINEER MAKE NO GUARANTEE IN REGARD TO

THE ACCURACY OF ANY INFORMATION THAT WAS OBTAINED DURING

INVESTIGATIONS. THE CONTRACTOR SHALL: MAKE A THOROUGH SITE

INSPECTION IN ORDER TO FIELD CHECK EXISTING SITE CONDITIONS;

CORRELATE CONDITIONS WITH THE DRAWINGS; AND, RESOLVE ANY POSSIBLE

DREDGING CONFLICTS WITH THE OWNER AND ENGINEER PRIOR TO

COMMENCEMENT OF WORK. THE CONTRACTOR SHALL PERFORM ADDITIONAL

TOPOGRAPHIC SURVEYS HE/SHE DEEMS NECESSARY, PROVIDED THEY ARE

COORDINATED WITH THE OWNER. ANY CONDITIONS DETERMINED BY THE

CONTRACTOR THAT DIFFER FROM THE INFORMATION SHOWN ON THE

DRAWINGS THAT ARE NOT BROUGHT TO THE ATTENTION OF THE OWNER AND

ENGINEER PRIOR TO THE START OF WORK SHALL NOT BE CONSIDERED

GROUNDS FOR ADDITIONAL PAYMENT OR CHANGES TO THE CONTRACT

DURATION, OR ANY OTHER CLAIMS AGAINST THE OWNER OR OWNER'S

ENGINEER.

4. CONTRACTOR IS RESPONSIBLE FOR CONTACTING "MISS UTILITY" AT

1-800-257-7777, 48 HOURS PRIOR TO ANY EXCAVATION WORK.

5. THE MERIDIAN OF THIS SURVEY IS BASED ON THE MARYLAND NORTH AMERICAN

DATUM OF 1983 (NAD83).

6. ELEVATIONS SHOWN ARE REFERENCED TO THE NORTH AMERICAN VERTICAL

DATUM (NAVD-88).

7. PLANIMETRIC INFORMATION SHOWN HEREON HAS BEEN OBTAINED FROM

AERIAL SURVEYS BY LANGAN ENGINEERING AND ENVIRONMENTAL SERVICES,

LLC DURING APRIL, 2025.

8. OFFSETS (IF SHOWN) ARE FOR SURVEY REFERENCES ONLY AND SHOULD NOT

BE USED IN DREDGING OF ANY TYPE.

9. BOUNDARY, RIGHT OF WAY, ENVIRONMENTAL AND/OR HAZARDOUS MATERIALS

LOCATION, IF ANY, NOT COVERED UNDER THIS CONTRACT.

GENERAL SITE NOTES:

1. THE CONTRACTOR SHALL FURNISH, INSTALL, TEST AND COMPLETE ALL WORK IN

ACCORDANCE WITH THE CONTRACT DOCUMENTS. THE CONTRACTOR IS

RESPONSIBLE FOR MEANS AND METHODS OF DREDGING; AS SUCH, THESE

PLANS DO NOT COMPLETELY REPRESENT, NOR ARE THEY INTENDED TO

REPRESENT, ALL SPECIFIC INSTRUCTIONS REQUIRED FOR SITEWORK

DREDGING. THE CONTRACTOR IS RESPONSIBLE FOR COMPLETING ALL WORK

DEPICTED ON THESE PLANS IN ACCORDANCE WITH ALL APPLICABLE RULES,

REGULATIONS AND LAWS IN EFFECT AT THE TIME OF DREDGING.

2. CONTRACTOR SHALL TAKE ALL NECESSARY PRECAUTIONS TO PROTECT

EXISTING UTILITIES IF ANY ARE IDENTIFIED.

3. CONTRACTOR IS REQUIRED TO OBTAIN ALL RELATED PERMITS PRIOR TO

DREDGING.

4. CONTRACTOR SHALL COORDINATE SCHEDULE AND TRAFFIC CONTROL PLANS

WITH THE OWNER IN ORDER TO MAINTAIN ACCESS TO EXISTING FACILITIES AND

FOR EMERGENCY VEHICLES. THE ACCESS ROADWAY IS NARROW,

CONTRACTOR IS RESPONSIBLE FOR EVALUATING THE ABILITY OF ACCESS

ROADWAY TO TRANSPORT NECESSARY EQUIPMENT.

5. CONTRACTOR IS RESPONSIBLE FOR PREVENTING SEDIMENT AND DEBRIS FROM

LEAVING DREDGING SITE AND REENTERING THE RESERVOIR.

6. THE STAGING AREAS SHALL BE MAINTAINED DAILY. THIS INCLUDES, BUT IS NOT

LIMITED TO, INSPECTING SEDIMENT CONTROLS. CONTRACTOR SHALL LEAVE

THE SITE IN NEAT AND ORDERLY CONDITION AT THE END OF EACH WORKING

DAY.

7. DREDGING DEBRIS SHALL BE REMOVED FROM OWNER PROPERTY ON

REGULARLY SCHEDULED BASIS.

8. CONTRACTOR SHALL TOP SOIL, SEED AND MULCH ALL DISTURBED AREAS NOT

STABILIZED WITH TEMPORARY STABILIZATION.

9. ALL SEEDING AND SODDING SHALL BE AS PER STANDARDS AND

SPECIFICATIONS FOR SOIL EROSION AND SEDIMENT CONTROL IN URBANIZING

AREAS AS PUBLISHED BY THE MARYLAND DEPARTMENTS OF NATURAL

RESOURCES.

10. UPON COMPLETION OF WORK, CONTRACTOR SHALL REMOVE ALL EVIDENCE OF

WORK INCLUDING DIRT, TIRE TRACKS, ETC. AND LEAVE THE SITE IN A CLEAN

AND SPOTLESS CONDITION.

11. UPON REQUEST, AUTOCAD FILES CAN BE PROVIDED TO CONTRACTOR FOR

STAKEOUT PURPOSES.

12. EROSION/SEDIMENT CONTROL WILL BE STRICTLY ENFORCED.

13. AFTER HAVING SERVED THEIR PURPOSE, ALL TEMPORARY PROTECTIVE WORKS

SHALL BE REMOVED OR LEVELED AND GRADED TO THE EXTENT REQUIRED TO

PREVENT OBSTRUCTION IN ANY DEGREE WHATSOEVER OF THE FLOW OF

WATER TO THE SPILLWAY OR OUTLET WORKS AND SO AS NOT TO INTERFERE IN

ANY WAY WITH THE OPERATION OR MAINTENANCE OF THE STRUCTURE.

SHEET INDEX

# SHEET ID SHEET TITLE

1 C001 COVER SHEET

C011

EXISTING CONDITIONS PLAN I

5 C201 EROSION & SEDIMENT CONTROL PLAN II

C010

C200

EXISTING CONDITIONS PLAN II

EROSION & SEDIMENT CONTROL PLAN I

GENERAL NOTES:

APPLICABLE DESIGN STANDARDS

SEVERAL DESIGN STANDARDS AND GUIDELINES WERE USED TO GUIDE THE PROJECT DOCUMENTATION SHOWN

HERE, INCLUDING, BUT NOT LIMITED TO:

1. 2011 MARYLAND STANDARDS AND SPECIFICATIONS FOR SOIL EROSION AND SEDIMENT CONTROL

2. DREDGED MATERIAL MANAGEMENT ACT OF 2001 (MD. CODE ENVIR. § 5-1101 ET SEQ.)

3. COMAR 26.24.03.02 - DREDGING - GENERAL

4. COMAR 26.24.03.03 - UPLAND DISPOSAL OF DREDGED MATERIAL

5. COMAR 26.17.01.11 - SEDIMENT CONTROL DESIGN STANDARDS AND SPECIFICATIONS

6. INNOVATIVE REUSE AND BENEFICIAL USE OF DREDGE MATERIAL GUIDANCE (DEC 2019)

6 C500 EROSION & SEDIMENT CONTROL NOTES & DETAILS I

7 C501 EROSION & SEDIMENT CONTROL NOTES & DETAILS I

LEGEND

BUILDING OVERHANG

SPOT ELEVATION

CONTOUR LINE

DRAINAGE MARK OUT LINE

TREE LINE

CHAINLINK FENCE

WATER VALVE

VALVE UNKNOWN

UNDERGROUND VAULT

ELECTRIC BOX

CATCH BASIN

POWER POLE

TREE

SHRUB

SIGN

FIRE HYDRANT

ELECTRIC METER

MANHOLE (TYPE AS LABELED)

GUY WIRE

HAND HOLE

FLAG POLE

DOUBLE DOOR

LIGHT POLE

DOOR

BOLLARD

BOH

SF SF

WETLAND EXTENTS

WASHDOWN AREA

MINOR COUNTOUR

EDGE OF WATER

MAJOR CONTOUR

TURBIDITY CURTAIN

DEWATERING AREA

DREDGING EXTENTS

TREE PROTECTION FENCING

SILT FENCE

LIMIT OF WORK

Drawing Title www.langan.com

1300 Wilson Boulevard, Suite 450 Arlington, VA 22209

T: 571.366.6800 F: 571.366.6801

Langan Engineering and Environmental Services, Inc.

La ng an

Project No.

Date

Sheet of

270088515

Project

GILBERT RUN

LAKE DREDGING

CHARLOTTE HALL

CHARLES COUNTY MARYLAND

Pr oj ec t N o.

C H

AR

LE

S C

O U

N

TY

D

AM

W

H

EA

TL

EY

NOVEMBER 5, 2025

Drawing No.

Drawn By

JE

Checked By

TGA

LOCATION MAP

SCALE: 1" = 600'

DECEMBER 4, 2025

OVERFLOW STRUCTURE

WOOD RETAINING

WALL

WOOD FENCE

PEDESTRIAN WOOD BRIDGE

GILBERT RUN LAKE

WHEATLEY

RUN

STORAGE

BUILDING

OFFICE

GILBERT RUN

BOAT RAMP

TICKETING

WOODEN

DOCK

WOODEN

DOCK

WOODEN

DOCK

WOODEN

DECK

PAVILION

PAVILION

PAVILION

PEDESTRIAN WOOD BRIDGE

WOODEN

DOCK

WOODEN

DOCK

WOODEN

DOCK

WOOD

RETAINING WALL

WOOD RETAINING

WALL

PAVILION

PAVILION

PAVILION

STORAGE ROOM

RESIDENCE

ACCESS TRAIL

ACCESS TRAIL

ACCESS TRAIL

ACCESS TRAIL

RESIDENCE

RESIDENCE

MATCHLINE - SEE C011

MATCHLINE - SEE C010

MATCHLINE - SEE C011

MATCHLINE - SEE C010

VOLLEYBALL COURT

(SAND)

PLAYSCAPE

GRAVEL

EDGE OF WATER

STEPS

WOODEN

DECK

PATHWAY

PEDESTRIAN

WOODEN BRIDGE

STAIRS

STAIRS

STEPS

ASPHALT

PARKING LOT

GRASS

GRASS

GRASS

GRASS

WOODED AREA

PAVILION

ASPHALT STREET

ASP

HAL

T ST

REE

T

ASPHALT S

TREET

ASPHALT PARKING LOT

GRASS

GRASS

GRASS

GRASS

GRASS

WOODED AREA

WOODED AREA

WOODED AREA

GRAVEL

GRAVEL PARKING

AREA

WOODED AREA

WOODED AREA

WOODED AREA

WOODED AREA

WOODED AREA

WOODED AREA

WOODED AREA

WOODED AREA

WOODED AREA

WOODED AREA

WOODED AREA

STORAGE YARD

WOODED AREA

WOODED AREA

OBSCURED

OBSCURED

POOL

PLAYSCAPE

EDGE OF WATER

0 150 300 450

(IN FEET)

1 inch = 150 ft.

GRAPHIC SCALE

EXISTING CONDITIONS PLAN I NOTES:

1. THE MERIDIAN OF THIS SURVEY IS BASED ON THE MARYLAND NORTH

AMERICAN DATUM OF 1983 (NAD83).

2. ELEVATIONS SHOWN ARE REFERENCED TO THE NORTH AMERICAN VERTICAL

DATUM (NAVD88).THE MERIDIAN IS REFERENCED TO MARYLAND STATE PLANE

COORDINATE SYSTEM ZONE, NAD 83.

3. TOPOGRAPHIC INFORMATION SHOWN HEREON BASED ON AERIAL

PHOTOGRAPHY PREPARED BY LANGAN ENGINEERING & ENVIRONMENTAL

SERVICES INC. DATED SEPTEMBER 2018, WITH AERIAL MAPPING

PHOTOGRAMMETRICALLY PREPARED TO MEET A MAP PRESENTATION SCALE

OF 1' = 150". MAP DATA DEPICTED HERE MEETS HORIZONTAL AND VERTICAL

ACCURACY STANDARDS ASSOCIATED WITH 1' = 150" MAP SCALE. AREAS

OBSCURED BY VEGETATION MIGHT NOT MEET THESE STANDARDS.

4. OFFSETS (IF SHOWN) ARE FOR SURVEY REFERENCES ONLY AND ARE NOT TO

BE USED FOR CONSTRUCTION OF ANY TYPE.

5. AT THE TIME OF FIELD SURVEY, THERE WAS NO OBSERVABLE EVIDENCE OF

EARTH MOVING WORK ON THE SUBJECT PROPERTY.

6. AT THE TIME OF FIELD SURVEY, THERE WAS NO OBSERVABLE EVIDENCE OF

THE SITE BEING USED AS A SOLID WASTE DUMP, SUMP OR SANITARY LANDFILL

ON THE SUBJECT PROPERTY.

7. UNLESS SPECIFICALLY NOTED HEREON, STORM AND SANITARY SEWER

INFORMATION (INCLUDING PIPE INVERT, PIPE MATERIAL, AND PIPE SIZE) WAS

OBSERVED AND MEASURED AT FIELD LOCATED STRUCTURES

(MANHOLES/CATCH BASINS, ETC ). CONDITIONS CAN VARY FROM THOSE

ENCOUNTERED AT THE TIMES WHEN AND LOCATIONS WHERE DATA IS

OBTAINED. DESPITE MEETING THE REQUIRED STANDARD OF CARE THE

SURVEYOR CANNOT AND DOES NOT WARRANT THAT PIPE MATERIAL AND/OR

PIPE SIZE THROUGHOUT THE PIPE RUN ARE THE SAME AS THOSE OBSERVED

AT EACH STRUCTURE, OR THAT THE PIPE RUN IS STRAIGHT BETWEEN THE

LOCATED STRUCTURES. ADDITIONAL UTILITY (WATER, GAS, ELECTRIC ETC)

DATA MAY BE SHOWN FROM FIELD LOCATED SURFACE MARKINGS (BY

OTHERS), EXISTING STRUCTURES, AND/OR FROM EXISTING DRAWINGS,

UNLESS SPECIFICALLY NOTED HERE-ON THE SURVEYOR HAS NOT EXCAVATED

TO PHYSICALLY LOCATE THE UNDERGROUND UTILITIES. THE SURVEYOR

MAKES NO GUARANTEES THAT THE SHOWN UNDERGROUND UTILITIES ARE

EITHER IN SERVICE, ABANDONED OR SUITABLE FOR USE, NOR ARE IN THE

EXACT LOCATION OR CONFIGURATION INDICATED HEREON. PRIOR TO ANY

DESIGN OR CONSTRUCTION THE PROPER UTILITY AGENCIES MUST BE

CONTACTED FOR VERIFICATION OF UTILITY TYPE AND FOR FIELD LOCATIONS.

8. THIS PLAN IS NOT VALID UNLESS STAMPED WITH THE SEAL OF THE

UNDERSIGNED PROFESSIONAL(S).

LEGEND

BUILDING OVERHANG

SPOT ELEVATION

CONTOUR LINE

DRAINAGE MARK OUT LINE

TREE LINE

CHAINLINK FENCE

WATER VALVE

VALVE UNKNOWN

UNDERGROUND VAULT

ELECTRIC BOX

CATCH BASIN

POWER POLE

TREE

SHRUB

SIGN

FIRE HYDRANT

ELECTRIC METER

MANHOLE (TYPE AS LABELED)

GUY WIRE

HAND HOLE

FLAG POLE

DOUBLE DOOR

LIGHT POLE

DOOR

BOLLARD

BOH

Filename: \\langan.com\data\ARL\data5\270088501\Project Data\CAD\Wheatley Dredging\SheetFiles\JPA\C010-C011 - EXISTING CONDITIONS PLAN.dwg Date: 11/5/2025 Time: 11:20 User: jelrafey Style Table: Langan.stb Layout: VT-100

Drawing Title www.langan.com

1300 Wilson Boulevard, Suite 450 Arlington, VA 22209

T: 571.366.6800 F: 571.366.6801

Langan Engineering and Environmental Services, Inc.

La ng an

Project No.

Date

Sheet of

270088515

Project

GILBERT RUN

LAKE DREDGING

CHARLOTTE HALL

CHARLES COUNTY MARYLAND

Pr oj ec t N o.

C H

AR

LE

S C

O U

N

TY

D

AM

W

H

EA

TL

EY

NOVEMBER 5, 2025

Drawing No.

Drawn By

JE

Checked By

TGA

VICINITY MAP

SCALE: 1" = 5000'

SITE

EXISTING

CONDITIONS

PLAN I

C010

GILBERT RUN

LAKE

PEDESTRIAN

WOODEN

BRIDGE

WOODEN

DECK

ACCESS TRAIL

RESIDENCE

RESIDENCE

RESIDENCE

RESIDENCE

MATCHLINE - SEE C011

MATCHLINE - SEE C010MATCHLINE - SEE C010

PEDESTRIAN

WOODEN

BRIDGE

WOODED AREA

WOODED AREA

WOODED AREA

WOODED AREA

WOODED AREA

WOODED AREA

WOODED AREA

WOODED AREA

WOODED AREA

WOODED AREA

WOODED AREA

GRASS

OBSCURED

EDGE OF WATER

UNNAMED

TRIBUTARY

WHEATLEY RUN

0 150 300 450

(IN FEET)

1 inch = 150 ft.

GRAPHIC SCALE

EXISTING CONDITIONS PLAN II NOTES:

1. THE MERIDIAN OF THIS SURVEY IS BASED ON THE MARYLAND NORTH

AMERICAN DATUM OF 1983 (NAD83).

2. ELEVATIONS SHOWN ARE REFERENCED TO THE NORTH AMERICAN VERTICAL

DATUM (NAVD88).THE MERIDIAN IS REFERENCED TO MARYLAND STATE PLANE

COORDINATE SYSTEM ZONE, NAD 83.

3. TOPOGRAPHIC INFORMATION SHOWN HEREON BASED ON AERIAL

PHOTOGRAPHY PREPARED BY LANGAN ENGINEERING & ENVIRONMENTAL

SERVICES INC. DATED SEPTEMBER 2018, WITH AERIAL MAPPING

PHOTOGRAMMETRICALLY PREPARED TO MEET A MAP PRESENTATION SCALE

OF 1' = 150". MAP DATA DEPICTED HERE MEETS HORIZONTAL AND VERTICAL

ACCURACY STANDARDS ASSOCIATED WITH 1' = 150" MAP SCALE. AREAS

OBSCURED BY VEGETATION MIGHT NOT MEET THESE STANDARDS.

4. OFFSETS (IF SHOWN) ARE FOR SURVEY REFERENCES ONLY AND ARE NOT TO

BE USED FOR CONSTRUCTION OF ANY TYPE.

5. AT THE TIME OF FIELD SURVEY, THERE WAS NO OBSERVABLE EVIDENCE OF

EARTH MOVING WORK ON THE SUBJECT PROPERTY.

6. AT THE TIME OF FIELD SURVEY, THERE WAS NO OBSERVABLE EVIDENCE OF

THE SITE BEING USED AS A SOLID WASTE DUMP, SUMP OR SANITARY LANDFILL

ON THE SUBJECT PROPERTY.

7. UNLESS SPECIFICALLY NOTED HEREON, STORM AND SANITARY SEWER

INFORMATION (INCLUDING PIPE INVERT, PIPE MATERIAL, AND PIPE SIZE) WAS

OBSERVED AND MEASURED AT FIELD LOCATED STRUCTURES

(MANHOLES/CATCH BASINS, ETC ). CONDITIONS CAN VARY FROM THOSE

ENCOUNTERED AT THE TIMES WHEN AND LOCATIONS WHERE DATA IS

OBTAINED. DESPITE MEETING THE REQUIRED STANDARD OF CARE THE

SURVEYOR CANNOT AND DOES NOT WARRANT THAT PIPE MATERIAL AND/OR

PIPE SIZE THROUGHOUT THE PIPE RUN ARE THE SAME AS THOSE OBSERVED

AT EACH STRUCTURE, OR THAT THE PIPE RUN IS STRAIGHT BETWEEN THE

LOCATED STRUCTURES. ADDITIONAL UTILITY (WATER, GAS, ELECTRIC ETC)

DATA MAY BE SHOWN FROM FIELD LOCATED SURFACE MARKINGS (BY

OTHERS), EXISTING STRUCTURES, AND/OR FROM EXISTING DRAWINGS,

UNLESS SPECIFICALLY NOTED HERE-ON THE SURVEYOR HAS NOT EXCAVATED

TO PHYSICALLY LOCATE THE UNDERGROUND UTILITIES. THE SURVEYOR

MAKES NO GUARANTEES THAT THE SHOWN UNDERGROUND UTILITIES ARE

EITHER IN SERVICE, ABANDONED OR SUITABLE FOR USE, NOR ARE IN THE

EXACT LOCATION OR CONFIGURATION INDICATED HEREON. PRIOR TO ANY

DESIGN OR CONSTRUCTION THE PROPER UTILITY AGENCIES MUST BE

CONTACTED FOR VERIFICATION OF UTILITY TYPE AND FOR FIELD LOCATIONS.

8. THIS PLAN IS NOT VALID UNLESS STAMPED WITH THE SEAL OF THE

UNDERSIGNED PROFESSIONAL(S).

LEGEND

BUILDING OVERHANG

SPOT ELEVATION

CONTOUR LINE

DRAINAGE MARK OUT LINE

TREE LINE

CHAINLINK FENCE

WATER VALVE

VALVE UNKNOWN

UNDERGROUND VAULT

ELECTRIC BOX

CATCH BASIN

POWER POLE

TREE

SHRUB

SIGN

FIRE HYDRANT

ELECTRIC METER

MANHOLE (TYPE AS LABELED)

GUY WIRE

HAND HOLE

FLAG POLE

DOUBLE DOOR

LIGHT POLE

DOOR

BOLLARD

BOH

Filename: \\langan.com\data\ARL\data5\270088501\Project Data\CAD\Wheatley Dredging\SheetFiles\JPA\C010-C011 - EXISTING CONDITIONS PLAN.dwg Date: 11/5/2025 Time: 11:20 User: jelrafey Style Table: Langan.stb Layout: VT-101

Drawing Title www.langan.com

1300 Wilson Boulevard, Suite 450 Arlington, VA 22209

T: 571.366.6800 F: 571.366.6801

Langan Engineering and Environmental Services, Inc.

La ng an

Project No.

Date

Sheet of

270088515

Project

GILBERT RUN

LAKE DREDGING

CHARLOTTE HALL

CHARLES COUNTY MARYLAND

Pr oj ec t N o.

C H

AR

LE

S C

O U

N

TY

D

AM

W

H

EA

TL

EY

NOVEMBER 5, 2025

Drawing No.

Drawn By

JE

Checked By

TGA

VICINITY MAP

SCALE: 1" = 5000'

SITE

EXISTING

CONDITIONS

PLAN II

C011

0 150 300 450

(IN FEET)

1 inch = 150 ft.

GRAPHIC SCALE

C200

LEGEND

LIMIT OF WORK

SILT FENCE

TREE PROTECTION FENCING

DREDGING EXTENTS

DEWATERING AREA

WASHDOWN AREA

WETLAND EXTENTS

TURBIDITY CURTAIN

EXISTING MAJOR CONTOUR

EXISTING MINOR CONTOUR

EXISTING EDGE OF WATER

EXISTING VEGETATION

EXISTING TREE

EROSION & SEDIMENT CONTROL PLAN NOTES:

1. ALL WORK SHALL BE IN ACCORDANCE WITH THE LATEST CHARLES COUNTY

DEPARTMENT OF PLANNING AND GROWTH MANAGEMENT SPECIFICATIONS

MANUAL, THE LATEST CHARLES COUNTY DETAIL MANUAL AND IN

ACCORDANCE WITH ALL COUNTY ORDINANCES.

2. PERIMETER EROSION AND SEDIMENT CONTROL MEASURES TO BE INSTALLED

PRIOR TO DREDGING AND REMAIN FOR THE DURATION OF DREDGING

ACTIVITIES.

3. MAINTAIN EROSION AND SEDIMENT CONTROL MEASURES IN WORKING

CONDITION THROUGHOUT DREDGING.

4. EROSION AND SEDIMENT PRACTICES, AND SITE IN GENERAL, MUST BE

INSPECTED WEEKLY AND AFTER EACH RAIN FALL EVENT, BY THE

CONTRACTOR, AND ANY NEEDED MAINTENANCE PERFORMED IMMEDIATELY.

5. DREDGED MATERIAL SHALL BE TRANSPORTED TO TEMPORARY DEWATERING

AREA TO DRY AND BE TRANSPORTED OFFSITE.

6. TOTAL APPROXIMATE LIMITS OF WORK: 2.91 ACRES.

7. SILT FENCE TO BE INSTALLED ON THE EDGE OF DEWATERING AREAS AND

AND WASHDOWN AREA TO PREVENT SEDIMENT AND DEMOLITION DEBRIS

FROM ENTERING THE RESERVOIR.

8. SILT FENCE SHOULD BE ADDED DOWN GRADE OF ALL DISTURBED AREAS.

CONTRACTOR TO VERIFY ELEVATIONS IN FIELD AND PROVIDE ADDITIONAL

SILT FENCE AS NEEDED BASED ON SITE CONDITIONS ENCOUNTERED.

9. INSTALL ADDITIONAL EROSION AND SEDIMENT CONTROL MEASURES AS

DETERMINED BY THE CHARLES COUNTY SEDIMENT CONTROL INSPECTOR.

10. REFER TO CHARLES COUNTY STANDARD DEWATERING SPECIFICATION FOR

CARE OF WATER DURING DREDGING PROCESS.

11. TREE PROTECTION FENCING SHALL BE ADDED TO TREES TO REMAIN DURING

DREDGING ACTIVITY.

12. APPROXIMATE EXTENTS OF VEGETATION HAVE NOT BEEN SURVEYED AND

ARE ESTIMATED BASED ON A SITE VISIT PERFORMED BY LANGAN ON

04/25/2025. CONTRACTOR SHOULD VERIFY EXTENTS OF VEGETATION IN

ORDER TO ESTABLISH A WOODY VEGETATION-FREE ZONE.

13. EXISTING ACCESS DRIVE CAN BE USED AS STABILIZED CONSTRUCTION

ENTRANCE. IMPROVEMENTS MAY BE MADE TO THE EXISTING ACCESS DRIVE

AS REQUIRED BY THE SITE INSPECTOR. AN SCE DETAIL HAS BEEN ADDED TO

SHEET C500 FOR REFERENCE.

SF SF

GILBERT RUN LAKE

STORAGE BUILDING

OFFICE

TICKETING

RESIDENCE

AMBERLEIGH PL

RESIDENCE

RESIDENCE

GR=103.07

RIM=98.03

RIM=97.58SF

SF

C500

C500

TPF

C501

C501

C501

SF

C500

APPROXIMATE EXTENTS OF LAKE

AREA THAT CAN BE DREDGED

APPROXIMATE EXTENTS OF

ADJACENT WETLANDS

APPROXIMATE EXTENTS

OF DEWATERING AREA

APPROXIMATE EXTENTS

OF DEWATERING AREA

SILT FENCE

SILT FENCE

TREE PROTECTION FENCING

EQUIPMENT WASHDOWN AREA

FOOTPRINT AREA: 0.16 ACRES

TREE PROTECTION

FENCING

TREE PROTECTION FENCING

GILBERT RUN BOAT RAMP

LAKE INGRESS/EGRESS FOR DREDGING BARGE

SILT FENCE

APPROXIMATE LIMITS OF WORK

FOOTPRINT AREA: 2.91 ACRES

APPROXIMATE LOCATION OF

CONSTRUCTION ENTRANCE

TYPE II TURBIDITY CURTAIN 02

C500

TURBIDITY CURTAIN

ANCHOR POINT

TURBIDITY CURTAIN

ANCHOR POINT

MATCHLINE - SEE C201

MATCHLINE - SEE C200

MATCHLINE - SEE C201

MATCHLINE - SEE C200

Drawing Title www.langan.com

1300 Wilson Boulevard, Suite 450 Arlington, VA 22209

T: 571.366.6800 F: 571.366.6801

Langan Engineering and Environmental Services, Inc.

La ng an

Project No.

Date

Sheet of

270088515

Project

GILBERT RUN

LAKE DREDGING

CHARLOTTE HALL

CHARLES COUNTY MARYLAND

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NOVEMBER 5, 2025

Drawing No.

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Checked By

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VICINITY MAP

SCALE: 1" = 5000'

SITE

EROSION &

SEDIMENT

CONTROL PLAN I

C200

0 150 300 450

(IN FEET)

1 inch = 150 ft.

GRAPHIC SCALE

C201

LEGEND

LIMIT OF WORK

SILT FENCE

TREE PROTECTION FENCING

DREDGING EXTENTS

DEWATERING AREA

WASHDOWN AREA

WETLAND EXTENTS

TURBIDITY CURTAIN

EXISTING MAJOR CONTOUR

EXISTING MINOR CONTOUR

EXISTING EDGE OF WATER

EXISTING VEGETATION

EXISTING TREE

SF SF

EROSION & SEDIMENT CONTROL PLAN NOTES:

1. ALL WORK SHALL BE IN ACCORDANCE WITH THE LATEST CHARLES COUNTY

DEPARTMENT OF PLANNING AND GROWTH MANAGEMENT SPECIFICATIONS

MANUAL, THE LATEST CHARLES COUNTY DETAIL MANUAL AND IN

ACCORDANCE WITH ALL COUNTY ORDINANCES.

2. PERIMETER EROSION AND SEDIMENT CONTROL MEASURES TO BE INSTALLED

PRIOR TO DREDGING AND REMAIN FOR THE DURATION OF DREDGING

ACTIVITIES.

3. MAINTAIN EROSION AND SEDIMENT CONTROL MEASURES IN WORKING

CONDITION THROUGHOUT DREDGING.

4. EROSION AND SEDIMENT PRACTICES, AND SITE IN GENERAL, MUST BE

INSPECTED WEEKLY AND AFTER EACH RAIN FALL EVENT, BY THE

CONTRACTOR, AND ANY NEEDED MAINTENANCE PERFORMED IMMEDIATELY.

5. DREDGED MATERIAL SHALL BE TRANSPORTED TO TEMPORARY DEWATERING

AREA TO DRY AND BE TRANSPORTED OFFSITE.

6. TOTAL APPROXIMATE LIMITS OF WORK: 2.91 ACRES.

7. SILT FENCE TO BE INSTALLED ON THE EDGE OF DEWATERING AREAS AND

AND WASHDOWN AREA TO PREVENT SEDIMENT AND DEMOLITION DEBRIS

FROM ENTERING THE RESERVOIR.

8. SILT FENCE SHOULD BE ADDED DOWN GRADE OF ALL DISTURBED AREAS.

CONTRACTOR TO VERIFY ELEVATIONS IN FIELD AND PROVIDE ADDITIONAL

SILT FENCE AS NEEDED BASED ON SITE CONDITIONS ENCOUNTERED.

9. INSTALL ADDITIONAL EROSION AND SEDIMENT CONTROL MEASURES AS

DETERMINED BY THE CHARLES COUNTY SEDIMENT CONTROL INSPECTOR.

10. REFER TO CHARLES COUNTY STANDARD DEWATERING SPECIFICATION FOR

CARE OF WATER DURING DREDGING PROCESS.

11. TREE PROTECTION FENCING SHALL BE ADDED TO TREES TO REMAIN DURING

DREDGING ACTIVITY.

12. APPROXIMATE EXTENTS OF VEGETATION HAVE NOT BEEN SURVEYED AND

ARE ESTIMATED BASED ON A SITE VISIT PERFORMED BY LANGAN ON

04/25/2025. CONTRACTOR SHOULD VERIFY EXTENTS OF VEGETATION IN

ORDER TO ESTABLISH A WOODY VEGETATION-FREE ZONE.

13. EXISTING ACCESS DRIVE CAN BE USED AS STABILIZED CONSTRUCTION

ENTRANCE. IMPROVEMENTS MAY BE MADE TO THE EXISTING ACCESS DRIVE

AS REQUIRED BY THE SITE INSPECTOR. AN SCE DETAIL HAS BEEN ADDED TO

SHEET C500 FOR REFERENCE.

C201

LEGEND

LIMIT OF WORK

SILT FENCE

TREE PROTECTION FENCING

DREDGING EXTENTS

DEWATERING AREA

WASHDOWN AREA

WETLAND EXTENTS

TURBIDITY CURTAIN

EXISTING MAJOR CONTOUR

EXISTING MINOR CONTOUR

EXISTING EDGE OF WATER

EXISTING VEGETATION

EXISTING TREE

SF SF

EROSION & SEDIMENT CONTROL PLAN NOTES:

1. ALL WORK SHALL BE IN ACCORDANCE WITH THE LATEST CHARLES COUNTY

DEPARTMENT OF PLANNING AND GROWTH MANAGEMENT SPECIFICATIONS

MANUAL, THE LATEST CHARLES COUNTY DETAIL MANUAL AND IN

ACCORDANCE WITH ALL COUNTY ORDINANCES.

2. PERIMETER EROSION AND SEDIMENT CONTROL MEASURES TO BE INSTALLED

PRIOR TO DREDGING AND REMAIN FOR THE DURATION OF DREDGING

ACTIVITIES.

3. MAINTAIN EROSION AND SEDIMENT CONTROL MEASURES IN WORKING

CONDITION THROUGHOUT DREDGING.

4. EROSION AND SEDIMENT PRACTICES, AND SITE IN GENERAL, MUST BE

INSPECTED WEEKLY AND AFTER EACH RAIN FALL EVENT, BY THE

CONTRACTOR, AND ANY NEEDED MAINTENANCE PERFORMED IMMEDIATELY.

5. DREDGED MATERIAL SHALL BE TRANSPORTED TO TEMPORARY DEWATERING

AREA TO DRY AND BE TRANSPORTED OFFSITE.

6. TOTAL APPROXIMATE LIMITS OF WORK: 2.91 ACRES.

7. SILT FENCE TO BE INSTALLED ON THE EDGE OF DEWATERING AREAS AND

AND WASHDOWN AREA TO PREVENT SEDIMENT AND DEMOLITION DEBRIS

FROM ENTERING THE RESERVOIR.

8. SILT FENCE SHOULD BE ADDED DOWN GRADE OF ALL DISTURBED AREAS.

CONTRACTOR TO VERIFY ELEVATIONS IN FIELD AND PROVIDE ADDITIONAL

SILT FENCE AS NEEDED BASED ON SITE CONDITIONS ENCOUNTERED.

9. INSTALL ADDITIONAL EROSION AND SEDIMENT CONTROL MEASURES AS

DETERMINED BY THE CHARLES COUNTY SEDIMENT CONTROL INSPECTOR.

10. REFER TO CHARLES COUNTY STANDARD DEWATERING SPECIFICATION FOR

CARE OF WATER DURING DREDGING PROCESS.

11. TREE PROTECTION FENCING SHALL BE ADDED TO TREES TO REMAIN DURING

DREDGING ACTIVITY.

12. APPROXIMATE EXTENTS OF VEGETATION HAVE NOT BEEN SURVEYED AND

ARE ESTIMATED BASED ON A SITE VISIT PERFORMED BY LANGAN ON

04/25/2025. CONTRACTOR SHOULD VERIFY EXTENTS OF VEGETATION IN

ORDER TO ESTABLISH A WOODY VEGETATION-FREE ZONE.

13. EXISTING ACCESS DRIVE CAN BE USED AS STABILIZED CONSTRUCTION

ENTRANCE. IMPROVEMENTS MAY BE MADE TO THE EXISTING ACCESS DRIVE

AS REQUIRED BY THE SITE INSPECTOR. AN SCE DETAIL HAS BEEN ADDED TO

SHEET C500 FOR REFERENCE.

GILBERT RUN LAKE

APPROXIMATE EXTENTS OF LAKE

AREA THAT CAN BE DREDGED

APPROXIMATE EXTENTS OF

ADJACENT WETLANDS

TYPE II TURBIDITY CURTAIN02

C500

TURBIDITY CURTAIN

ANCHOR POINT

TURBIDITY CURTAIN

ANCHOR POINT

MATCHLINE - SEE C201

MATCHLINE - SEE C200MATCHLINE - SEE C200

Drawing Title www.langan.com

1300 Wilson Boulevard, Suite 450 Arlington, VA 22209

T: 571.366.6800 F: 571.366.6801

Langan Engineering and Environmental Services, Inc.

La ng an

Project No.

Date

Sheet of

270088515

Project

GILBERT RUN

LAKE DREDGING

CHARLOTTE HALL

CHARLES COUNTY MARYLAND

Pr oj ec t N o.

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NOVEMBER 5, 2025

Drawing No.

Drawn By

JE

Checked By

TGA

VICINITY MAP

SCALE: 1" = 5000'

EROSION &

SEDIMENT

CONTROL PLAN II

C201

SITE

SCALE: NTS

SILT FENCE DETAIL01

C200 C500

C500 - E & S DETAILS 1

EROSION AND SEDIMENT CONTROL GENERAL NOTES

MDE REQUIRES THAT THESE NOTES, IN THEIR ENTIRETY, BE INCLUDED ON THE

EROSION AND SEDIMENT CONTROL PLAN. IT IS RECOGNIZED THAT NOT EVERY NOTE

MAY APPLY TO ALL PROJECTS. THE REQUIREMENT OF ANY INDIVIDUAL NOTE NOT

APPLICABLE TO THE SUBJECT PROJECT IS NOT BINDING UPON THE APPLICANT OR

THE APPLICANT'S CONTRACTOR.

1. THE CONTRACTOR SHALL NOTIFY MDE AT (410) 537-3510 AND CHARLES COUNTY

INSPECTIONS AT (301) 645-0700 SEVEN (7) DAYS BEFORE COMMENCING ANY

LAND DISTURBING ACTIVITY AND, UNLESS WAIVED BY MDE, SHALL BE REQUIRED

TO HOLD A PRE-CONSTRUCTION MEETING BETWEEN PROJECT

REPRESENTATIVES AND A REPRESENTATIVE OF MDE.

2. THE CONTRACTOR SHALL NOTIFY MDE AND CHARLES COUNTY INSPECTIONS IN

WRITING AND BY TELEPHONE AT THE FOLLOWING POINTS:

A. THE REQUIRED PRE-CONSTRUCTION MEETING.

B. FOLLOWING INSTALLATION OF SEDIMENT CONTROL MEASURES.

C. DURING THE INSTALLATION OF SEDIMENT BASINS (TO BE CONVERTED INTO

PERMANENT STORMWATER MANAGEMENT STRUCTURES) AT THE REQUIRED

INSPECTION POINTS (SEE INSPECTION CHECKLIST ON PLAN). NOTIFICATION

PRIOR TO COMMENCING CONSTRUCTION OF EACH STEP IS MANDATORY.

D. PRIOR TO REMOVAL OR MODIFICATION OF ANY SEDIMENT CONTROL

STRUCTURE(S).

E. PRIOR TO REMOVAL OF ALL SEDIMENT CONTROL DEVICES.

F. PRIOR TO FINAL ACCEPTANCE.

3. THE PLAN APPROVAL LETTER, APPROVED EROSION AND SEDIMENT CONTROL

PLANS, DAILY LOG BOOKS, AND TEST REPORTS SHALL BE AVAILABLE AT THE

SITE FOR INSPECTION BY DULY AUTHORIZED OFFICIALS OF MDE AND THE

AGENCY RESPONSIBLE FOR THE PROJECT.

4. THE CONTRACTOR SHALL CONSTRUCT ALL EROSION AND SEDIMENT CONTROL

MEASURES PER THE APPROVED PLAN AND CONSTRUCTION SEQUENCE AND

SHALL HAVE THEM INSPECTED AND APPROVED BY THE MDE INSPECTOR PRIOR

TO BEGINNING ANY OTHER LAND DISTURBANCES. MINOR SEDIMENT CONTROL

DEVICE LOCATION ADJUSTMENTS MAY BE MADE IN THE FIELD WITH THE

APPROVAL OF THE MDE INSPECTOR. THE CONTRACTOR SHALL ENSURE THAT

ALL RUNOFF FROM DISTURBED AREAS IS DIRECTED TO THE SEDIMENT

CONTROL DEVICES AND SHALL NOT REMOVE ANY EROSION OR SEDIMENT

CONTROL MEASURE WITHOUT PRIOR PERMISSION FROM MDE INSPECTOR. THE

CONTRACTOR SHALL OBTAIN PRIOR AGENCY AND MDE APPROVAL FOR

MODIFICATIONS TO THE EROSION AND SEDIMENT CONTROL PLAN AND/OR

SEQUENCE OF CONSTRUCTION.

5. THE MDE INSPECTOR HAS THE OPTION OF REQUIRING ADDITIONAL SAFETY OR

SEDIMENT CONTROL MEASURES, IF DEEMED NECESSARY.

6. THE CONTRACTOR SHALL PROTECT ALL POINTS OF CONSTRUCTION INGRESS

AND EGRESS TO PREVENT THE DEPOSITION OF MATERIALS ONTO PUBLIC

ROADS. ALL MATERIALS DEPOSITED ONTO PUBLIC ROADS SHALL BE REMOVED

IMMEDIATELY.

7. THE CONTRACTOR SHALL INSPECT DAILY AND MAINTAIN CONTINUOUSLY IN AN

EFFECTIVE OPERATING CONDITION ALL EROSION AND SEDIMENT CONTROL

MEASURES UNTIL SUCH TIME AS THEY ARE REMOVED WITH PRIOR PERMISSION

FROM THE MDE INSPECTOR.

8. ALL WATER REMOVED FROM EXCAVATED AREAS SHALL BE PASSED THROUGH

AN MDE APPROVED DEWATERING PRACTICE TO STABLE GROUND SURFACE.

SEE FILTER BAG DETAIL ON ATTACHED SHEET FOR REFERENCE.

9. CONSTRUCTION ACTIVITIES PRODUCING DUST SHALL IMPLEMENT CONTROL

MEASURES TO AVOID THE SUSPENSION OF DUST PARTICLES AND/OR PREVENT

DUST FROM BLOWING OFF-SITE OR TO AREAS WITHOUT TREATMENT.

10. FOLLOWING INITIAL SOIL DISTURBANCE OR RE-DISTURBANCE, PERMANENT OR

TEMPORARY STABILIZATION SHALL BE COMPLETED WITHIN:

A. THREE (3) CALENDAR DAYS AS TO THE SURFACE OF ALL PERIMETER

CONTROLS, DIKES, SWALES, DITCHES, PERIMETER SLOPES, AND ALL SLOPES

STEEPER THAN 3 HORIZONTAL TO 1 VERTICAL (3:1); AND

B. SEVEN (7) CALENDAR DAYS AS TO ALL OTHER DISTURBED OR GRADED

AREAS ON THE PROJECT SITE NOT UNDER ACTIVE GRADING.

11. VEGETATIVE STABILIZATION SHALL BE PERFORMED IN ACCORDANCE WITH THE

2011 MARYLAND STANDARDS AND SPECIFICATIONS FOR SOIL EROSION AND

SEDIMENT CONTROL. REFER TO APPROPRIATE SPECIFICATIONS FOR

TEMPORARY SEEDING, PERMANENT SEEDING, MULCHING, SODDING, AND

GROUND COVERS.

12. WHEN SEEDING, ALL DISTURBED AREAS WITH SLOPES 3:1 OR STEEPER SHALL

BE STABILIZED WITH SOIL STABILIZATION MATTING PER STANDARD ESC DETAIL

B-4-6-B OVER 5-8 INCHES OF TOPSOIL LIGHTLY COMPACTED A MINIMUM OF 4

INCHES AND SEED.

13. PERMANENT SWALES OR OTHER POINTS OF CONCENTRATED WATER FLOW

SHALL BE STABILIZED WITH SEED AND AN APPROVED EROSION CONTROL

MATTING, SOD, RIP-RAP, OR OTHER APPROVED STABILIZATION MEASURES.

14. SURFACE DRAINAGE FLOWS OVER UNSTABILIZED CUT AND FILL SLOPES SHALL

BE CONTROLLED BY EITHER PREVENTING DRAINAGE FLOWS FROM TRAVERSING

THE SLOPES OR BY INSTALLING PROTECTIVE DEVICES TO LOWER THE WATER

DOWNSLOPE WITHOUT CAUSING EROSION. DIKES SHALL BE INSTALLED AND

MAINTAINED AT THE TOP OF A CUT OR FILL SLOPE UNTIL THE SLOPE AND

DRAINAGE AREA TO IT ARE FULLY STABILIZED, AT WHICH TIME THEY MUST BE

REMOVED AND FINAL GRADING DONE TO PROMOTE SHEET FLOW DRAINAGE.

PROTECTIVE METHODS MUST BE PROVIDED AT POINTS OF CONCENTRATED

FLOW WHERE EROSION IS LIKELY TO OCCUR.

15. PRIOR TO REMOVAL OF SEDIMENT CONTROL MEASURES, THE CONTRACTOR

SHALL STABILIZE AND HAVE ESTABLISHED PERMANENT STABILIZATION FOR ALL

CONTRIBUTORY DISTURBED AREAS USING SOD OR AN APPROVED PERMANENT

SEED MIXTURE WITH REQUIRED SOIL AMENDMENTS AND AN APPROVED

ANCHORED MULCH. WOOD FIBER MULCH MAY ONLY BE USED IN SEEDING

SEASON WHERE THE SLOPE DOES NOT EXCEED 10% AND GRADING HAS BEEN

DONE TO PROMOTE SHEET FLOW DRAINAGE. AREAS BROUGHT TO FINISHED

GRADE DURING THE SEEDING SEASON SHALL BE PERMANENTLY STABILIZED AS

SOON AS POSSIBLE, BUT NOT LATER THAN THREE (3) CALENDAR DAYS AFTER

ESTABLISHMENT FOR SLOPES STEEPER THAN 3 HORIZONTAL TO 1 VERTICAL

(3:1) AND SEVEN (7) CALENDAR DAYS FOR FLATTER SLOPES. WHEN PROPERTY

IS BROUGHT TO FINISHED GRADE DURING THE MONTHS OF NOVEMBER

THROUGH FEBRUARY, AND PERMANENT STABILIZATION IS FOUND TO BE

IMPRACTICAL, TEMPORARY SEED AND ANCHORED STRAW MULCH SHALL BE

APPLIED TO DISTURBED AREAS. THE FINAL PERMANENT STABILIZATION OF

SUCH PROPERTY SHALL BE APPLIED BY MARCH 15 OR EARLIER IF GROUND AND

WEATHER CONDITIONS ALLOW.

16. TEMPORARY SEDIMENT CONTROL DEVICES SHALL BE REMOVED WITH

PERMISSION OF THE CHARLES COUNTY INSPECTOR WITHIN THIRTY (30)

CALENDAR DAYS FOLLOWING ESTABLISHMENT OF PERMANENT STABILIZATION

IN ALL CONTRIBUTORY DRAINAGE AREAS. UPON REMOVAL OF SEDIMENT

CONTROL DEVICES, THE AREA DISTURBED BY REMOVAL SHALL BE STABILIZED

WITH TOPSOIL, SEED, AND MULCH, OR AS SPECIFIED, WITHIN 24 HOURS OF SAID

REMOVAL. STORMWATER MANAGEMENT STRUCTURES USED TEMPORARILY

FOR SEDIMENT CONTROL SHALL BE CONVERTED TO THE PERMANENT

CONFIGURATION WITHIN THIS TIME PERIOD AS WELL.

CHARLES COUNTY EROSION & SEDIMENT CONTROL NOTES

1. CONTRACTOR/DEVELOPER MUST NOTIFY THE CHARLES COUNTY INSPECTIONS

(301) 645-0700, 5 DAYS PRIOR TO COMMENCING WORK.

2. ANY APPROVED SEDIMENT AND EROSION CONTROL PLAN WITH A SEQUENCE

AND/OR PRACTICES WHICH CONFLICT THIS PLAN, WILL REQUIRE PLAN

REVISIONS FOR ALL AFFECTED PLANS APPROVED BY THE CHARLES COUNTY

CONSERVATION DISTRICT.

3. THE APPROVAL OF THE SEDIMENT CONTROL INSPECTOR IS REQUIRED UPON

INSTALLATION OF PERIMETER EROSION AND SEDIMENT CONTROLS, BUT

BEFORE PROCEEDING WITH ANY OTHER EARTH DISTURBANCE OR GRADING.

4. CONTRACTOR SHOULD ENSURE NO RUTTING OR OTHER UNNECESSARY

DISTURBANCES OCCUR ON OR AROUND THE DAM AS A RESULT OF VEHICLES

OR OTHER CONSTRUCTION PRACTICES.

5. ANY DAMAGED AREAS SHOULD BE IMMEDIATELY REPAIRED AND STABILIZED TO

MATCH THEIR INITIAL CONDITION AT THE COST OF THE CONTRACTOR.

6. CONTRACTOR TO DETERMINE APPROPRIATE TEMPORARY STABILIZATION

MEASURES FOR WET AREAS. REFER TO MDE AND CHARLES COUNTY

TEMPORARY STABILIZATION NOTES FOR ADDITIONAL DETAIL IN DETERMINING

VEGETATION FOR WET AREAS.

TURBIDITY

CURTAIN-1

TYPE I

TYPE II

X

X

X

X

X

SOURCE: 2003 DISTRICT OF COLUMBIA GUIDEBOOK

TURBIDITY

CURTAIN-3

TYPICAL LAYOUTS:

STREAMS, PONDS & LAKES (PROTECTED & NON-TIDAL)

SOURCE: 2003 DISTRICT OF COLUMBIA GUIDEBOOK

USE THE FOLLOWING SEQUENCING FOR IMPLEMENTATION OF A TURBIDITY CURTAIN:

1. EXTEND TURBIDITY CURTAINS THE ENTIRE DEPTH OF THE WATERCOURSE WHENEVER THE WATERCOURSE IN QUESTION IS NOT SUBJECT TO TIDAL ACTION AND/OR

SIGNIFICANT WIND AND WAVE FORCES.

2. IN TIDAL AND/OR WIND AND WAVE ACTION SITUATIONS, THE CURTAIN SHOULD NEVER BE SO LONG AS TO TOUCH THE BOTTOM. A MINIMUM 1 FOOT "GAP" SHOULD EXIST BETWEEN THE WEIGHTED LOWER END OF THE SKIRT AND THE BOTTOM AT "MEAN" LOW WATER. MOVEMENT OF THE LOWER SKIRT OVER THE BOTTOM DUE TO TIDAL REVERSES OR WIND AND WAVE ACTION ON THE FLOTATION SYSTEM MAY FAN AND STIR SEDIMENTS ALREADY SETTLED OUT.

3. IN TIDAL AND/OR WIND AND WAVE ACTION SITUATIONS, IT IS SELDOM PRACTICAL TO EXTEND A TURBIDITY CURTAIN DEPTH LOWER THAN 10 TO 12 FEET BELOW THE SURFACE, EVEN IN DEEP WATER. CURTAINS WHICH ARE INSTALLED DEEPER THAN THIS WILL BE SUBJECT TO VERY LARGE LOADS WITH CONSEQUENT STRAIN ON CURTAIN MATERIALS AND THE MOORING SYSTEM. IN ADDITION, A CURTAIN INSTALLED IN SUCH A MANNER CAN "BILLOW UP" TOWARDS THE SURFACE UNDER THE PRESSURE OF THE MOVING WATER, WHICH WILL RESULT IN AN EFFECTIVE DEPTH WHICH IS SIGNIFICANTLY LESS THAN THE SKIRT DEPTH.

4. LOCATE TURBIDITY CURTAINS PARALLEL TO THE DIRECTION OF FLOW OF A MOVING BODY OF WATER. DO NOT PLACE TURBIDITY CURTAINS ACROSS THE MAIN FLOW OF A

SIGNIFICANT BODY OF MOVING WATER.

5. ATTEMPT TO AVOID AN EXCESSIVE NUMBER OF JOINTS IN THE CURTAIN; A MINIMUM CONTINUOUS SPAN OF 50 FEET BETWEEN JOINTS IS A GOOD "RULE OF THUMB."

6. FOR STABILITY REASONS, A MAXIMUM SPAN OF 100 FEET BETWEEN JOINTS (ANCHOR OR STAKE LOCATIONS) IS ALSO A GOOD RULE TO FOLLOW.

7. EXTEND THE ENDS OF THE CURTAIN, BOTH FLOATING UPPER AND WEIGHTED LOWER, WELL UP INTO THE SHORELINE, ESPECIALLY IF HIGH WATER CONDITIONS ARE EXPECTED. SECURE THE ENDS FIRMLY TO THE SHORELINE (PREFERABLY TO RIGID BODIES SUCH AS TREES OR PILES) TO FULLY ENCLOSE THE AREA WHERE SEDIMENT MAY

ENTER THE WATER.

8. WHEN THERE IS A SPECIFIC NEED TO EXTEND THE CURTAIN TO THE BOTTOM OF THE WATERCOURSE IN TIDAL OR MOVING WATER CONDITIONS, A HEAVY WOVEN PERVIOUS GEOTEXTILE MAY BE SUBSTITUTED FOR THE NORMALLY RECOMMENDED IMPERMEABLE GEOMEMBRANE. THIS CREATES A "FLOW-THROUGH" MEDIUM THAT SIGNIFICANTLY REDUCES THE PRESSURE ON THE CURTAIN AND WILL HELP TO KEEP IT IN THE SAME RELATIVE LOCATION AND SHAPE DURING THE RISE AND FALL OF TIDAL

WATERS.

9. TYPICAL ALIGNMENTS OF TURBIDITY CURTAINS CAN BE SEEN IN DETAIL 814.3. THE NUMBER AND SPACING OF EXTERNAL ANCHORS MAY VARY DEPENDING ON CURRENT VELOCITIES AND POTENTIAL WIND AND WAVE ACTION; FOLLOW MANUFACTURER'S RECOMMENDATIONS.

SCALE: NTS

TURBIDITY CURTAIN DETAIL02

C200 C500

Drawing Title www.langan.com

1300 Wilson Boulevard, Suite 450 Arlington, VA 22209

T: 571.366.6800 F: 571.366.6801

Langan Engineering and Environmental Services, Inc.

La ng an

Project No.

Date

Sheet of

270088515

Project

GILBERT RUN

LAKE DREDGING

CHARLOTTE HALL

CHARLES COUNTY MARYLAND

Pr oj ec t N o.

C H

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NOVEMBER 5, 2025

Drawing No.

Drawn By

JE

Checked By

TGA

EROSION &

SEDIMENT

CONTROL NOTES &

DETAILS I

C500

SCALE: NTS

TREE PROTECTION DETAIL04

C200 C501

C501 - E & S DETAILS 2

CREEPING RED

FESCUE

KENTUCKY

BLUEGRASS

CHEWINGS FESCUE

MAR. 1 TO

MAY 15; AUG.

1 TO OCT. 15

SCALE: NTS

STABILIZED CONSTRUCTION ENTRANCE DETAIL01

C200 C501 SCALE: NTS

CHARLES COUNTY SOIL SEEDING NOTES02

C200 C501

SCALE: NTS

CHARLES COUNTY SOIL SEEDING NOTES CONT.03

C200 C501

IN ADDITION TO THE PROPOSED PERMANENT SEEDING MIXTURE, THE CONTRACTOR SHOULD

INCORPORATE A SEEDING MIXTURE FOR NON-TIDAL WETLAND AREAS. THIS SEEDING MIXTURE SHOULD BE

USED ALONG THE DAM TOE IN AREAS TYPICALLY INUNDATED WITH WATER TO PROMOTE PROPER

VEGETATION GROWTH. CONTRACTOR IS RESPONSIBLE FOR PROVIDING SUITABLE VEGETATION IN NON-TIDAL WETLAND AREAS ALONG DAM TOE ONCE DEMOLITION IS COMPLETE. ERNMX-131 OBL WETLAND

MIX BY ERNST SEEDS OR APPROVED EQUAL SHOULD BE USED FOR SUCH AREAS.

CONTRACTOR SHALL PROVIDE ENGINEER OF RECORD WITH A SUBMITTAL SPECIFYING THE EXACT SEED

MIX PRIOR TO CONSTRUCTION.

Drawing Title www.langan.com

1300 Wilson Boulevard, Suite 450 Arlington, VA 22209

T: 571.366.6800 F: 571.366.6801

Langan Engineering and Environmental Services, Inc.

La ng an

Project No.

Date

Sheet of

270088515

Project

GILBERT RUN

LAKE DREDGING

CHARLOTTE HALL

CHARLES COUNTY MARYLAND

Pr oj ec t N o.

C H

AR

LE

S C

O U

N

TY

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AM

W

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TL

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NOVEMBER 5, 2025

Drawing No.

Drawn By

JE

Checked By

TGA

EROSION &

SEDIMENT

CONTROL NOTES &

DETAILS II

C501