Appendix_A_-_Transient_Set_Drawings_-_2606xx.pdf
PDF 3 MB Posted
- Solicitation number
- 27-002
- Issued by
- Charles County, Maryland
About this file
This is a set of technical construction drawings and design documents for the Mattawoman Wastewater Treatment Plant (MWWTP) Effluent Force Main Surge Management System, prepared by GHD Inc. for Charles County, Maryland, Department of Public Works. The project involves the design and construction of a new 40-foot diameter standpipe with a top water surface elevation of 138 feet and top of wall elevation of 18 feet to manage surge pressures in the effluent force main. The standpipe will accommodate a design flow of 60 million gallons per day (MGD) with a minimum of 15 feet of freeboard and dual 24-inch overflow pipes routed to the existing wet well. The project also includes construction of separate influent and effluent valve vaults, a bypass valve vault, piping connections using 42-inch and 36-inch ductile iron pipe (DIP), motorized gate valves, sump pump systems, a spiral staircase with safety cage, concrete splash pad with overflow swale, electrical instrumentation and control panels, and associated site restoration. The site is located at 5310 Hawthorne Road, La Plata, Maryland 20646, on a 121.022-acre parcel zoned for heavy industrial use within the 100-year floodplain at an 11-foot base flood elevation.
The design documents are marked as preliminary bridging documents dated October 2025 and note that final design for all aspects shall be completed by the Design-Builder. The project includes eight drawing sheets covering general information, civil plans, mechanical systems, and electrical site plans. Key design responsibilities assigned to the Design-Builder include sizing thrust blocks, designing temporary bypass piping systems, determining feasibility of reusing existing line stop taps, designing bollard placement and distribution, designing the overflow swale to convey 60 MGD, designing concrete vault structures, determining pipe support spacing, sizing and distributing vents to prevent pressurization, and coordinating structural design with the geotechnical information provided. The drawings reference necessary permits from Charles County Planning and Growth Management, Maryland Department of the Environment, Charles County Soil Conservation District, and Federal Aviation Administration for obstruction evaluation. Design criteria specify a minimum combined overflow cross-sectional area of 900 square inches, interior ladder requirements per OSHA regulations, stainless steel 316 bird screens on vents, and restrained mechanical joints throughout the piping system.
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2 LOCATION MAP
SCALE: NOT TO SCALE
GHD Inc.
16701 Melford Boulevard, Suite 330 Bowie MD 20715 USA T 1 240 206 6810 F 1 240 206 6811 W www.ghd.com
1 BRIDGING DOCUMENTS TM HJS 10/17/25
CHARLES COUNTY GOVERNMENT
DEPARTMENT OF PLANNING AND GROWTH MANAGEMENT
DEVELOPMENT SERVICES DIVISION
APPROVED FOR: REMARKS OR CONDITIONS
AS - BUILTSCONSTRUCTIONGRADING
ROADS
STORM DRAINAGE
STORMWATER
MANAGEMENT
WATER
SEWER
OTHER
DATESIGNED
THIS PERMIT EXPIRES ON
DATE:
CONSTRUCTION
CONSTRUCTION
CONSTRUCTION
CONSTRUCTION
CONSTRUCTION
CONSTRUCTION
AS - BUILTS
AS - BUILTS
AS - BUILTS
AS - BUILTS
AS - BUILTS
AS - BUILTS
Project
Client
Plot Date: 16 October 2025 - 9:56 AM \\ghdnet\ghd\US\Bowie\Projects\565\12571916\Digital_Design\ACAD\Sheets\12571916-GHD-XX-XX-DRG-G-0001.dwgPlotted By: Kristopher Larson
Bar is one inch on original size sheet
Approved Date Author Drafting Check
Designer Project Director
Project No. Date
Filename:
Drawing NumberThis document and the ideas and designs incorporated herein, as an instrument of professional service, is the property of GHD. This document may only be used by GHD’s client (and any other person who GHD has agreed can use this document) for the purpose for which it was prepared and must not be used by any other person or for any other purpose.
www.ghd.com
Title
1"
IssueNo. Checked
Design Check
Project Manager Conditions of Use
Scale Sheet
ANSI D
Size of
CHARLES COUNTY, MARYLAND
MWWTP EFFLUENT PS FORCE MAIN SURGE
MANAGEMENT SYSTEM CONSTRUCTION
T. JUNKER
J. STURDEVANT 12571916 10/2025 8
MATTAWOMAN WASTEWATER TREATMENT PLANT
5310 HAWTHORNE RD
LA PLATA, MARYLAND 20646
COVER SHEET
G001 1AS NOTED
L. BERRY
T. JUNKER
B. BLANCHARD
T. BIAGIOLI
DEPARTMENT OF PUBLIC WORKS
CHARLES COUNTY, MARYLAND
MATTAWOMAN WASTEWATER TREATMENT PLANT -
EFFLUENT PS FORCE MAIN SURGE MANAGEMENT
SYSTEM CONSTRUCTION
OCTOBER 2025
BRIDGING DOCUMENTS
N
GENERAL NOTES:
1. LOT ADDRESS: MATTAWOMAN WASTEWATER TREATMENT PLANT
5310 HAWTHORNE RD
LAPLATA, MARYLAND 20646
2. OWNER: CHARLES COUNTY
SANITARY DISTRICT, INC
3. TAX MAP/ GRID/ TAX MAP 0021, GRID 0008, PARCEL 0012, BLOCK N/A
PARCEL/ BLOCK:
4. ZONING IH - HEAVY INDUSTRIAL
5. LOT SIZE: 121.022 ACRES
6. DEED REFERENCES: /00126/ 00719
7. TAX ACCOUNT ID: 07-040059
8. ADC MAP: MAP 07, GRID E10 (26th EDITION)
9. ELECTION DISTRICT: 7th
10. VERTICAL DATUM: NAVD88 PLUS 1.12 FEET
11. HORIZONTAL DATUM: NAD 1983 (1991 MARYLAND STATE PLANE COORDINATE SYSTEM)
SITE LOCATION
SITE LOCATION
PERMIT APPLICATIONS*
PERMIT APPROVING AGENCY PERMIT NO. STATUS APPROVAL DATE EXPIRATION DATE
CONCEPT
STORMWATER
MANAGEMENT PLAN
CHARLES COUNTY PLANNING AND GROWTH
MANAGEMENT
SITE STORMWATER
MANAGEMENT PLAN
CHARLES COUNTY PLANNING AND GROWTH
MANAGEMENT
DEVELOPMENT SERVICE
PERMIT
CHARLES COUNTY PLANNING AND GROWTH
MANAGEMENT
BUILDING PERMIT CHARLES COUNTY PLANNING AND GROWTH
MANAGEMENT
STORMWATER
CONSTRUCTION PERMIT
MARYLAND DEPARTMENT OF THE
ENVIRONMENT (MDE)
SOIL CONSERVATION
DISTRICT PERMIT
CHARLES COUNTY SOIL CONSERVATION
DISTRIC
OBSTRUCTION
EVALUATION FEDERAL AVIATION ADMINISTRATION
1 VICINITY MAP
SCALE: NOT TO SCALE
*NOT A FINAL LIST OF PERMITS. CONTRACTOR TO DETERMINE NECESSARY PERMITS.
N http://www.ghd.com/ http://www.ghd.com
GHD Inc.
16701 Melford Boulevard, Suite 330 Bowie MD 20715 USA T 1 240 206 6810 F 1 240 206 6811 W www.ghd.com
1 BRIDGING DOCUMENTS TM HJS 10/17/25
CHARLES COUNTY GOVERNMENT
DEPARTMENT OF PLANNING AND GROWTH MANAGEMENT
DEVELOPMENT SERVICES DIVISION
APPROVED FOR: REMARKS OR CONDITIONS
AS - BUILTSCONSTRUCTIONGRADING
ROADS
STORM DRAINAGE
STORMWATER
MANAGEMENT
WATER
SEWER
OTHER
DATESIGNED
THIS PERMIT EXPIRES ON
DATE:
CONSTRUCTION
CONSTRUCTION
CONSTRUCTION
CONSTRUCTION
CONSTRUCTION
CONSTRUCTION
AS - BUILTS
AS - BUILTS
AS - BUILTS
AS - BUILTS
AS - BUILTS
AS - BUILTS
Project
Client
Plot Date: 16 October 2025 - 9:56 AM G:\565\12571916\Digital_Design\ACAD\Sheets\12571916-GHD-XX-XX-DRG-G-0002.dwgPlotted By: Kristopher Larson
Bar is one inch on original size sheet
Approved Date Author Drafting Check
Designer Project Director
Project No. Date
Filename:
Drawing NumberThis document and the ideas and designs incorporated herein, as an instrument of professional service, is the property of GHD. This document may only be used by GHD’s client (and any other person who GHD has agreed can use this document) for the purpose for which it was prepared and must not be used by any other person or for any other purpose.
www.ghd.com
Title
1"
IssueNo. Checked
Design Check
Project Manager Conditions of Use
Scale Sheet
ANSI D
Size of
CHARLES COUNTY, MARYLAND
MWWTP EFFLUENT PS FORCE MAIN SURGE
MANAGEMENT SYSTEM CONSTRUCTION
T. JUNKER
J. STURDEVANT 12571916 10/2025 8
MATTAWOMAN WASTEWATER TREATMENT PLANT
5310 HAWTHORNE RD
LA PLATA, MARYLAND 20646
LIST OF DRAWINGS, GENERAL
NOTES, ABBREVIATIONS,
LEGENDS, AND SYMBOLS
G002 2AS NOTED
L. BERRY
T. JUNKER
B. BLANCHARD
T. BIAGIOLI
LIST OF ABBREVIATIONS
ABD ABANDONED
CL CENTERLINE
CONC CONCRETE
CP CONSTRUCTION POINT
CV CHECK VALVE
DA DRAINAGE AREA
DIP DUCTILE IRON PIPE
EL / ELEV ELEVATION
EX EXISTING
FCH FUTURE CHEMICAL
FF FINISHED FLOOR
INV INVERT
MH MANHOLE
MIN MINIMUM
PVC POLYVINYL CHLORIDE
QTY QUANTITY
RP ROAD CONSTRUCTION POINT
SB SOIL BORING
STD STANDARD
T TELEPHONE
12" DIP, PEF
12" DIP, PEF
12" DIP, PEF
N
NEW GRAPHICS; EQUIPMENT, STRUCTURES, ETC., ARE
SHOWN AS BOLD LINEWORK AND IN THIS TEXT FORMAT.
SECTION LETTER
DRAWING NUMBER
(REPRESENTS DRAWING
WHERE SECTION IS DRAWN)
SECTION LETTER
DRAWING NUMBER
(REPRESENTS DRAWING WHERE
SECTION MARKS ARE SHOWN)
DETAIL NUMBER
DRAWING NUMBER
(REPRESENTS DRAWING
WHERE DETAIL IS DRAWN)
DETAIL NUMBER
DRAWING NUMBER
(REPRESENTS DRAWING
WHERE DETAIL IS DRAWN)
PIPING DESIGNATION
(VARIES, SEE 'LIST OF PIPING
DESIGNATIONS')
PIPE SIZE AND MATERIAL
GENERAL LEGEND
EXISTING PIPE CALLOUT (FOR PLANS)
TYPICAL SECTION MARKS (FOR PLANS)
TYPICAL SECTION SUB-TITLE (FOR SECTIONS)
TYPICAL DETAIL MARKS
TYPICAL DETAILING
PIPE SIZE AND PIPING DESIGNATION
(VARIES, SEE 'LIST OF PIPING
DESIGNATIONS')
NEW PIPE CALLOUT (FOR PLANS)
PIPING DESIGNATION
(VARIES, SEE 'LIST OF PIPING
DESIGNATIONS')PIPE SIZE AND MATERIAL
NEW/EXIST PIPE CALLOUT (FOR SECTIONS)
INVERT or CENTER LINE
ELEVATION
INVERT or CENTER LINE
NOT REQUIRED
PIPE SIZE AND PIPING
DESIGNATION
(VARIES, SEE 'LIST OF
PIPING DESIGNATIONS')
NORTH ARROW
A X-301
DETAIL NAME
A X-301
X-501
G00X
DETAIL
SCALE:
A G00X
SECTION
SCALE:
DRAINAGE AREA
DIVIDE
SILT FENCESF SF
FENCEX X
CONTOUR LINE (MAJOR)
CONTOUR LINE (MINOR)
100 YEAR FLOODPLAIN (FEMA)
EASEMENT LINE
LIGHT POST
RADIUSR##'
RP-X
XxX
ELEV
POINT #
CLEANOUTCO
YARD HYDRANT
TELEPHONET T
L L
E E
ROAD SIGN
VALVE
WATER LINEW W
SURVEY CONTROL POINT/
MONUMENT (BENCHMARK)
UTILITY POLE
LIGHT POLE
PROCESS MANHOLE
CONCRETE
EXISTING STRUCTURE
PROPERTY LINE
WOODS
TEMPORARY FENCE
SOIL DIVIDE LINE
SOIL TYPE
RIPRAP
MH
X X X X
ELECTRICAL DUCTBANK
SANITARY MANHOLESMH
FIRE HYDRANT
ROADWAY CONSTRUCTION
STAKEOUT POINT
CHEMICAL MANHOLE
DRAINAGE MANHOLE
ELECTRICAL MANHOLE
ELECTRICAL HANDHOLE
15-25% SLOPES
>25% SLOPES
NEW STRUCTURE
CP-X
CMH
DMH
FH
LIMIT OF DISTURBANCE
SCE
LOD LOD
CIVIL LEGEND
CULVERT
M
S
SOLENOID VALVE
PRESSURE RELIEF VALVE
PRESSURE GAUGE
MOTOR OPERATOR
HOSE BARB
QUICK CONNECT (FEMALE)
T
FM
I
TEMPERATURE GAUGE
FLOW METER
HEAT TRACED AND INSULATED
PIPING (FOR INSULATION LIMITS
AND REQUIREMENTS REFER TO
INDIVIDUAL DRAWINGS)
PIPE FITTINGS AND VALVE SYMBOLS
PLUG VALVE
PINCH VALVE
GATE VALVE
CHECK VALVE
BALL VALVE
GLOBE VALVE
BUTTERFLY VALVE
PRSSURE REDUCING VALVE
3-WAY PLUG VALVE
DIAPHRAGM VALVE
FLUSHING CONNECTION
W/ CAP OR PLUG
AIR RELEASE VALVE
ELBOW UP
ELBOW DOWN
TEE IN PLANE
TEE DOWN
TEE UP
45° ELBOW
90° ELBOW
LATERAL WYE
CONCENTRIC REDUCER
ECCENTRIC REDUCER
BLIND FLANGE
PIPE CAP
MECHANICAL JOINT
FLANGED JOINT
WELDED JOINT
EXPANSION JOINT
DISMANTLING JOINT/
FLANGED COUPLING ADAPTER
EXPANSION COUPLING
MECHANICAL COUPLING
FLOWMETER
RESTRAINED JOINT/ PUSH ON JOINT
FM
RESTRAINED DISMANTLING JOINT/
RESTRAINED FLANGE COUPLING
ADAPTER
INSULATED PIPING
HOSE BIBB
HOSE RACK
DOUBLE LINE SINGLE LINE
90° BEND
45° BEND
TEE
LATERAL WYE
REDUCER
PLUG VALVE
GATE VALVE
YARD PIPING LEGEND
ELBOW UP
ELBOW DOWN
90° ELBOW IN PLANE
TEE UP
TEE DOWN
ECCENTRIC REDUCER
45° ELBOW IN PLANE
SINGLE LINE
PIPING SYMBOLS
Y STRAINER
DRAIN
GRAVEL PAVEMENT
ELECTRIC POLE
INV EL XX.XX
℄ EL XX.XX
SB-X SOIL BORING
DRAINAGE SWALE> >
WETLAND
25' WETLAND BUFFER
LIST OF DRAWINGS
SHEET
COUNT
DRAWING
# SHEET TITLE
GENERAL
1 G001 COVER SHEET
2 G002 LIST OF DRAWINGS, GENERAL NOTES, ABBREVIATIONS, LEGENDS, AND SYMBOLS
CIVIL
3 C001 EXISTING SITE PLAN AND DEMOLITION PLAN
4 C002 PROPOSED SITE, PIPING, AND GRADING PLAN
MECHANICAL
5 M001 PARTIAL PROCESS FLOW DIAGRAM AND DESIGN CRITERIA
6 M002 STANDPIPE STRUCTURES PLANS
7 M003 STANDPIPE STRUCTURES SECTIONS
ELECTRICAL
8 E001 ELECTRICAL SITE PLAN
LIST PIPING DESIGNATIONS
PIPE DESIGNATION PIPE NAME
ABD ABANDONED
DRN DRAIN
EFF PLANT EFFLUENT
FTR FUTURE USE
INF STANDPIPE INFLUENT
NPW NON POTABLE WATER
PA PROCESS AIR
PD PANT DRAIN
PW POTABLE WATER
RAW RAW INLUENT
SAMP SAMPLE LINE
SD STORM DRAIN
SEF SCREEN EFFLUENT
SPD SUMP PUMP DISCHARGE
UW UTILITY WATER
VT VENT
1. EXISTING FACILITIES AND PIPING SHOWN LIGHT. NEW FACILITIES
AND PIPING SHOWN DARK.
2. EXISTING CONDITIONS SHOWN ON THE DRAWINGS ARE BASED
ON TOPOGRAPHIC SURVEY PERFORMED BY D.H. STEFFENS
COMPANY IN JUNE 2024, AND OBTAINED FROM AVAILABLE
CONTRACT AND RECORD DRAWINGS. LOCATIONS MUST BE
CONSIDERED APPROXIMATE ONLY.
3. THE DESIGN IN THIS DRAWING SET IS PRELIMINARY AND BASED
ON THE INFORMATION AVAILABLE AT THE TIME OF DESIGN. FINAL
DESIGN FOR ALL ASPECTS SHALL BE BY THE DESIGN BUILDER.
GENERAL NOTES
11.0 FT FLOOD ELEVATION
(SEE NOTE 2)
EXISTING
PUMPING STATION
100 YEAR FLOODPLAIN
(SEE NOTE 1)
(SEE NOTE 3)
DEMOLISH PIPING AND FITTINGS AS
NECESSARY FOR STANDPIPE INFLUENT
AND EFFLUENT PIPE CONNECTIONS (TYP)
DEMOLISH PIPING
SCALE: 1"=10'-0"
EXISTING SITE PLAN AND DEMOLITION PLAN
0 20'
SCALE 1" = 10' AT ORIGINAL SIZE
15105
NOTES:
1. 100 - YEAR FLOODPLAIN IS FROM FEMA FIRM PANEL 155 OF 575, MAP 24017C0155D, EFF DATE 5/4/2015.
2. BASE FLOOD ELEVATION (11 FEET) PER FEMA FIRM PANEL 24017C0155C EFF. DATE 9/4/2013.
3. EXTENT OF PAVEMENT DEMOLITION NOT SHOWN. DESIGN BUILDER SHALL DEMOLISH PAVEMENT WITHIN THE AREA OF PROPOSED WORK TO THE EXTENT DIRECTED BY THE COUNTY AND AS NECESSARY TO INSTALL THE PROPOSED WORK.
4. DESIGN BUILDER SHALL NOT INITIATE DEMOLITION WITHOUT PRIOR COORDINATION WITH THE OWNER.
5. PROTECT EXISTING FENCE AND GATE DURING CONSTRUCTION. ANY DAMAGE OR REMOVED FENCING DURING CONSTRUCTION ACTIVITIES SHALL BE REPLACED IN KIND AT DESIGN BUILDER'S ESPENSE. NO ADDITIONAL EXPENSE TO THE OWNER.
GHD Inc.
16701 Melford Boulevard, Suite 330 Bowie MD 20715 USA T 1 240 206 6810 F 1 240 206 6811 W www.ghd.com
1 BRIDGING DOCUMENTS TM HJS 10/17/25
CHARLES COUNTY GOVERNMENT
DEPARTMENT OF PLANNING AND GROWTH MANAGEMENT
DEVELOPMENT SERVICES DIVISION
APPROVED FOR: REMARKS OR CONDITIONS
AS - BUILTSCONSTRUCTIONGRADING
ROADS
STORM DRAINAGE
STORMWATER
MANAGEMENT
WATER
SEWER
OTHER
DATESIGNED
THIS PERMIT EXPIRES ON
DATE:
CONSTRUCTION
CONSTRUCTION
CONSTRUCTION
CONSTRUCTION
CONSTRUCTION
CONSTRUCTION
AS - BUILTS
AS - BUILTS
AS - BUILTS
AS - BUILTS
AS - BUILTS
AS - BUILTS
Project
Client
Plot Date: 16 October 2025 - 9:56 AM G:\565\12571916\Digital_Design\ACAD\Sheets\12571916-GHD-XX-XX-DRG-C-0001.dwgPlotted By: Kristopher Larson
Bar is one inch on original size sheet
Approved Date Author Drafting Check
Designer Project Director
Project No. Date
Filename:
Drawing NumberThis document and the ideas and designs incorporated herein, as an instrument of professional service, is the property of GHD. This document may only be used by GHD’s client (and any other person who GHD has agreed can use this document) for the purpose for which it was prepared and must not be used by any other person or for any other purpose.
www.ghd.com
Title
1"
IssueNo. Checked
Design Check
Project Manager Conditions of Use
Scale Sheet
ANSI D
Size of
CHARLES COUNTY, MARYLAND
MWWTP EFFLUENT PS FORCE MAIN SURGE
MANAGEMENT SYSTEM CONSTRUCTION
T. JUNKER
J. STURDEVANT 12571916 10/2025 8
MATTAWOMAN WASTEWATER TREATMENT PLANT
5310 HAWTHORNE RD
LA PLATA, MARYLAND 20646
EXISTING SITE PLAN AND
DEMOLITION PLAN
C001 3AS NOTED
L. BERRY
T. JUNKER
B. BLANCHARD
T. BIAGIOLI
N
LEGEND
DEMOLITION
EXISTING
PUMPING STATION
EFFLUENT
VALVE VAULT
INFLUENT
VALVE VAULT
54"x42"
WYE
THRUST BLOCK
(SEE NOTE 3)
THRUST BLOCK
(SEE NOTE 3)
42"x36" REDUCER
RESTRAINED
MECHANICAL
TEMPORARY ISOLATION
VALVE AND BLIND FLANGE
TEMPORARY BYPASS PIPE
FM
TEMPORARY FLOWMETER
TEMPORARY BYPASS PIPE
(SEE NOTE 4)
40ft DIAMETER
DUAL OVERFLOW
36"x24" REDUCER
36"x24"
WYE
6" DIP, DRN
OVERFLOW ROUTED
TO WET WELL
DRAIN TIES IN WITH
OVERFLOW TO WET WELL
11.0 FT FLOOD ELEVATION
(SEE NOTE 2)
100 YEAR FLOODPLAIN
(SEE NOTE 1)
36" GATE VALVE
WITH ELECTRIC
ACTUATOR
CONNECT SUMP PUMP
DISCHARGE TO PLANT
SEWER (TYP)
STANDPIPE
(T/S EL. 18.00)
BYPASS VALVE VAULT RESTRAINED
DISMANTLING
JOINT (TYP)
45° BEND
SCALE: 1"=10'-0"
PROPOSED SITE, PIPING AND GRADING PLAN
0 20'
SCALE 1" = 10' AT ORIGINAL SIZE
15105
GHD Inc.
16701 Melford Boulevard, Suite 330 Bowie MD 20715 USA T 1 240 206 6810 F 1 240 206 6811 W www.ghd.com
1 BRIDGING DOCUMENTS TM HJS 10/17/25
CHARLES COUNTY GOVERNMENT
DEPARTMENT OF PLANNING AND GROWTH MANAGEMENT
DEVELOPMENT SERVICES DIVISION
APPROVED FOR: REMARKS OR CONDITIONS
AS - BUILTSCONSTRUCTIONGRADING
ROADS
STORM DRAINAGE
STORMWATER
MANAGEMENT
WATER
SEWER
OTHER
DATESIGNED
THIS PERMIT EXPIRES ON
DATE:
CONSTRUCTION
CONSTRUCTION
CONSTRUCTION
CONSTRUCTION
CONSTRUCTION
CONSTRUCTION
AS - BUILTS
AS - BUILTS
AS - BUILTS
AS - BUILTS
AS - BUILTS
AS - BUILTS
Project
Client
Plot Date: 16 October 2025 - 9:56 AM G:\565\12571916\Digital_Design\ACAD\Sheets\12571916-GHD-XX-XX-DRG-C-0002.dwgPlotted By: Kristopher Larson
Bar is one inch on original size sheet
Approved Date Author Drafting Check
Designer Project Director
Project No. Date
Filename:
Drawing NumberThis document and the ideas and designs incorporated herein, as an instrument of professional service, is the property of GHD. This document may only be used by GHD’s client (and any other person who GHD has agreed can use this document) for the purpose for which it was prepared and must not be used by any other person or for any other purpose.
www.ghd.com
Title
1"
IssueNo. Checked
Design Check
Project Manager Conditions of Use
Scale Sheet
ANSI D
Size of
CHARLES COUNTY, MARYLAND
MWWTP EFFLUENT PS FORCE MAIN SURGE
MANAGEMENT SYSTEM CONSTRUCTION
T. JUNKER
J. STURDEVANT 12571916 10/2025 8
MATTAWOMAN WASTEWATER TREATMENT PLANT
5310 HAWTHORNE RD
LA PLATA, MARYLAND 20646
PROPOSED SITE, PIPING, AND
GRADING PLAN
C002 4AS NOTED
L. BERRY
T. JUNKER
B. BLANCHARD
T. BIAGIOLI
20' -0"
MINIMUM
N
NOTES:
1. 100 - YEAR FLOODPLAIN IS FROM FEMA FIRM PANEL 155 OF 575, MAP 24017C0155D, EFF DATE 5/4/2015.
2. BASE FLOOD ELEVATION (11 FEET) PER FEMA FIRM PANEL 24017C0155C EFF. DATE 9/4/2013.
3. THRUST BLOCKS ARE NOT DRAWN TO SCALE. DESIGN BUILDER TO SIZE THRUST BLOCKS.
4. DESIGN BUILDER SHALL BE RESPONSIBLE FOR THE DESIGN OF THE TEMPORARY BYPASS PIPE AND ALL ASSOCIATED FITTINGS, CONNECTION DETAILS, THRUST RESTRAINT, TEMPORARY SUPPORTS AND ALL OTHER FACILITIES REQUIRED FOR THE FULL DURATION OF THE ANTICIPATED TEMPORARY OPERATING SCENARIOS.
DESIGN BUILDER TO DETERMINE THE FEASIBILITY OF REUSING THE EXISTING TAPS FOR LINE STOPS.
5. DESIGN BUILDER SHALL DESIGN THE NUMBER AND DISTRIBUTION OF BOLLARDS TO PROTECT EXPOSED
PIPING, STAIRCASE, AND STANDPIPE.
6. EXTENT OF PAVEMENT AND YARD RESTORATION NOT SHOWN. DESIGN-BUILDER SHALL RESTORE PAVEMENT
AND YARD WITHIN THE AREA OF PROPOSED WORK TO THE EXTENT DIRECTED BY THE COUNTY.
7. DESIGN BUILDER SHALL DESIGN A SWALE CAPABLE OF CONVEYING 60 MGD FROM THE CONCRETE SPLASH
PAD TO THE OUTSIDE OF THE EXISTING FENCE.
8. DESIGN BUILDER SHALL REPLACE ANY DAMAGED OR REMOVED FENCE IN KIND DURING CONSTRUCTION.
CONCRETE SPLASH PAD
FOR BLOW OFF PANELS
(REFER TO DWG M003)
36"x36" TEE
SEE NOTE 8
SEE NOTE 7
SEE NOTE 6
RELOCATE EXISTING
DRAINS AS NECESSARY
BOLLARD (TYP)
(SEE NOTE 5)
COUPLING (TYP)
GHD Inc.
16701 Melford Boulevard, Suite 330 Bowie MD 20715 USA T 1 240 206 6810 F 1 240 206 6811 W www.ghd.com
1 BRIDGING DOCUMENTS TM HJS 10/17/25
CHARLES COUNTY GOVERNMENT
DEPARTMENT OF PLANNING AND GROWTH MANAGEMENT
DEVELOPMENT SERVICES DIVISION
APPROVED FOR: REMARKS OR CONDITIONS
AS - BUILTSCONSTRUCTIONGRADING
ROADS
STORM DRAINAGE
STORMWATER
MANAGEMENT
WATER
SEWER
OTHER
DATESIGNED
THIS PERMIT EXPIRES ON
DATE:
CONSTRUCTION
CONSTRUCTION
CONSTRUCTION
CONSTRUCTION
CONSTRUCTION
CONSTRUCTION
AS - BUILTS
AS - BUILTS
AS - BUILTS
AS - BUILTS
AS - BUILTS
AS - BUILTS
Project
Client
Plot Date: 16 October 2025 - 9:57 AM G:\565\12571916\Digital_Design\ACAD\Sheets\12571916-GHD-XX-XX-DRG-M-0001.dwgPlotted By: Kristopher Larson
Bar is one inch on original size sheet
Approved Date Author Drafting Check
Designer Project Director
Project No. Date
Filename:
Drawing NumberThis document and the ideas and designs incorporated herein, as an instrument of professional service, is the property of GHD. This document may only be used by GHD’s client (and any other person who GHD has agreed can use this document) for the purpose for which it was prepared and must not be used by any other person or for any other purpose.
www.ghd.com
Title
1"
IssueNo. Checked
Design Check
Project Manager Conditions of Use
Scale Sheet
ANSI D
Size of
CHARLES COUNTY, MARYLAND
MWWTP EFFLUENT PS FORCE MAIN SURGE
MANAGEMENT SYSTEM CONSTRUCTION
T. JUNKER
J. STURDEVANT 12571916 10/2025 8
MATTAWOMAN WASTEWATER TREATMENT PLANT
5310 HAWTHORNE RD
LA PLATA, MARYLAND 20646
PARTIAL PROCESS FLOW
DIAGRAM AND DESIGN CRITERIA
M001 5NOT TO SCALE
L. BERRY
T. JUNKER
B. BLANCHARD
T. BIAGIOLI
FM
STANDPIPE
DESIGN CRITERIA
FLOWS
DESIGN FLOW 60 MGD
STANDPIPE
NUMBER OF STANDPIPES 1
MINIMUM TOP OF WALL ELEVATION 138 FT
MINIMUM FREEBOARD 15 FT
MINIMUM DIAMETER 40 FT
OVERFLOW LOCATION EXTERIOR
MINIMUM COMBINED OVERFLOW
CROSS SECTIONAL AREA 900 SQ IN
FLOW METERFM
GATE VALVE
INFLUENT
VALVE VAULT
OVERFLOW
EFFLUENT
VALVE VAULT
UTILITY WATER
CONNECTION
SUMP DRAIN
M
MMDRAIN
VENT
NEW/ MODIFY
LEGEND
MAIN PROCESS FLOW
DRAIN
VENT
GATE VALVE
CHECK VALVE
PUMP
BYPASS VALVE VAULT
SUMP PUMP
DISCHARGE (TYP)
MINIMUM COMBINED OVERFLOW
CROSS SECTIONAL AREA
900 SQ IN
40' DIAMETER
T/W EL. 138.00
T/S EL. 18.00
42" DIP, EFF
PLATFORM
(12'-0"x5'-0" MIN)
A M003
C M003
42" DIP, INF
CL OF INFLUENT PIPE
LADDER
(SEE NOTE 1)
CL OF EFFLUENT PIPE
COVER
FROM EFFLUENT
PUMP STATION
TO EFFLUENT
FORCE MAIN
24" OVERFLOW
24" OVERFLOW
36"x24" WYE
36"x24" REDUCER
36" OVERFLOW ROUTED
TO WET WELL
MANWAY AT GRADE
24"x10" WYE
10" GATE VALVE
10" SUMP DRAIN
B M003
3'-0" MIN
(SEE NOTE 5)
1'-0"
4'- 0"
MI
N
42" GATE VALVE
42" DIP, EFF
SUMP PUMP
DISCHARGE
CONCRETE
VALVE VAULT
(SEE NOTE 3)
3'- 0"
MI
N
SUMP PUMP
LADDER
SEE NOTE 2
RESTRAINED
DISMANTLING
JOINT
1'-0"
MIN
B
M003
CONCRETE
VALVE VAULT
PERSONNEL
ACCESS
REMOVABLE TO SLAB TO
ACCESS VALVE (SEE NOTE 4)
0 4'-0"
SCALE 3/16"=1'-0" AT ORIGINAL SIZE
8'-0" 12'-0"
1 STANDPIPE PLAN
SCALE: 3/16"=1'-0"
N
GHD Inc.
16701 Melford Boulevard, Suite 330 Bowie MD 20715 USA T 1 240 206 6810 F 1 240 206 6811 W www.ghd.com
1 BRIDGING DOCUMENTS TM HJS 10/17/25
CHARLES COUNTY GOVERNMENT
DEPARTMENT OF PLANNING AND GROWTH MANAGEMENT
DEVELOPMENT SERVICES DIVISION
APPROVED FOR: REMARKS OR CONDITIONS
AS - BUILTSCONSTRUCTIONGRADING
ROADS
STORM DRAINAGE
STORMWATER
MANAGEMENT
WATER
SEWER
OTHER
DATESIGNED
THIS PERMIT EXPIRES ON
DATE:
CONSTRUCTION
CONSTRUCTION
CONSTRUCTION
CONSTRUCTION
CONSTRUCTION
CONSTRUCTION
AS - BUILTS
AS - BUILTS
AS - BUILTS
AS - BUILTS
AS - BUILTS
AS - BUILTS
Project
Client
Plot Date: 16 October 2025 - 9:57 AM G:\565\12571916\Digital_Design\ACAD\Sheets\12571916-GHD-XX-XX-DRG-M-0002.dwgPlotted By: Kristopher Larson
Bar is one inch on original size sheet
Approved Date Author Drafting Check
Designer Project Director
Project No. Date
Filename:
Drawing NumberThis document and the ideas and designs incorporated herein, as an instrument of professional service, is the property of GHD. This document may only be used by GHD’s client (and any other person who GHD has agreed can use this document) for the purpose for which it was prepared and must not be used by any other person or for any other purpose.
www.ghd.com
Title
1"
IssueNo. Checked
Design Check
Project Manager Conditions of Use
Scale Sheet
ANSI D
Size of
CHARLES COUNTY, MARYLAND
MWWTP EFFLUENT PS FORCE MAIN SURGE
MANAGEMENT SYSTEM CONSTRUCTION
T. JUNKER
J. STURDEVANT 12571916 10/2025 8
MATTAWOMAN WASTEWATER TREATMENT PLANT
5310 HAWTHORNE RD
LA PLATA, MARYLAND 20646
3 INFLUENT/EFFLUENT VALVE VAULT TOP PLAN
SCALE: 1/2"=1'-0"
2 INFLUENT/EFFLUENT VALVE VAULT BOTTOM PLAN
SCALE: 1/2"=1'-0"
STANDPIPE STRUCTURES PLANS
M002 6AS NOTED
L. BERRY
T. JUNKER
B. BLANCHARD
T. BIAGIOLI
SCALE 1/2"=1'-0" AT ORIGINAL SIZE
1'-0" 4'-0"2'-0" 3'-0"
SCALE 1/2"=1'-0" AT ORIGINAL SIZE
1'-0" 4'-0"2'-0" 3'-0"
NOTES:
1. STANDPIPE INTERIOR LADDER SHALL HAVE INTERMEDIATE LANDINGS AS DIRECTED
BY THE OWNER OR OSHA REGULATIONS.
2. 12" FUTURE UTILITY WATER CONNECTION WITH ISOLATION VALVE AND BLIND
FLANGE ON EFFLUENT VALVE VAULT. 6" DRAIN CONNECTION WITH ISOLATION VALVE
ROUTED TO OVERFLOW PIPE ON INFLUENT VALVE VAULT. SEE CIVIL DRAWINGS.
3. DESIGN BUILDER SHALL BE RESPONSIBLE FOR DESIGN OF ALL CONCRETE VAULTS
PER THE CRITERIA OUTLINED IN THE SPECIFICATIONS.
4. VALVE VAULT TOP SLABS TO HAVE EMBEDDED LIFTING HOOKS.
5. BYPASS VALVE VAULT NOT SHOWN. DESIGN BUILDER SHALL DESIGN BYPASS VALVE
VAULT TO THE SAME SPECIFICATIONS AND MINIMUM DIMENSIONS AS SHOWN FOR
THE INFLUENT AND EFFLUENT VALVE VAULTS.
MIN
WALL PENETRATION PER
SPECIFICATIONS (TYP)
T/W EL 138.00 ±
T/S EL 18.00 ±
GRADE EL 17.50 ±
TOP PLATFORMCOVER
VENTS (TYP)
(SEE NOTE 6)
0 4'-0" 16'-0"
SCALE 1/8"=1'-0" AT ORIGINAL SIZE
8'-0" 12'-0" A
M002
SECTION
SCALE: 1/8"=1'-0"
NOTES:
1. DESIGN BUILDER SHALL BE RESPONSIBLE FOR STRUCTURAL DESIGN AND CONNECTION DETAILS
ASSOCIATED WITH THE SPIRAL STAIRCASE. LOCATION OF SPIRAL STAIRCASE SHALL BE
COORDINATED WITH INFLUENT/EFFLUENT PIPE, OVERFLOW PIPES, AND PLATFORMS. LANDINGS
SHALL BE PROVIDED AT SPACING REQUIRED BY OSHA OR REQUESTED BY THE COUNTY.
2. SIZE, STYLE, AND DISTRIBUTION OF BLOWOFF PANELS BY THE DESIGN BUILDER. BLOWOFF
PANELS MUST HAVE CONCRETE SPLASH PAD BENEATH AT GRADE WITH SWALE TO CARRY
OFFSITE. SEE CIVIL SHEETS.
3. DESIGN BUILDER SHALL BE RESPONSIBLE FOR DESIGN OF ALL CONCRETE VAULTS PER THE
CRITERIA OUTLINED IN THE SPECIFICATIONS.
4. THE DESIGN BUILDER SHALL BE RESPONSIBLE FOR THE BASE SLAB AND FOUNDATION
STRUCTURAL DESIGN, UTILIZING THE GEOTECHNICAL INFORMATION PROVIDED IN THE
SPECIFICATIONS. FOUNDATION DESIGN TO INCLUDE ANY NECESSARY GROUND IMPROVEMENT
AND/ OR OVER-EXCAVATION AND PLACEMENT OF CLEAN FILL, AS DETERMINED BY THE DESIGN
BUILDER.
5. THE DESIGN BUILDER SHALL BE RESPONSIBLE FOR DETERMINING THE REQUIRED SPACING OF ALL
INTERIOR AND EXTERIOR PIPE SUPPORTS, FOR ALL PIPING SYSTEMS.
6. DESIGN BUILDER SHALL BE RESPONSIBLE FOR SIZING AND DISTRIBUTING VENTS TO PREVENT PRESSURIZATION OF THE STANDPIPE. VENTS SHALL HAVE STAINLESS STEEL 316 BIRD SCREENS
AND SHALL BE DESIGNED TO PREVENT SUNLIGHT FROM ENTERING THE STANDPIPE.
7. RESTRAINED EXPANSION JOINTS SHALL BE SIZED BY THE DESIGN BUILDER TO ACCOMMODATE
STANDPIPE SETTLEMENT.
GHD Inc.
16701 Melford Boulevard, Suite 330 Bowie MD 20715 USA T 1 240 206 6810 F 1 240 206 6811 W www.ghd.com
1 BRIDGING DOCUMENTS TM HJS 10/17/25
CHARLES COUNTY GOVERNMENT
DEPARTMENT OF PLANNING AND GROWTH MANAGEMENT
DEVELOPMENT SERVICES DIVISION
APPROVED FOR: REMARKS OR CONDITIONS
AS - BUILTSCONSTRUCTIONGRADING
ROADS
STORM DRAINAGE
STORMWATER
MANAGEMENT
WATER
SEWER
OTHER
DATESIGNED
THIS PERMIT EXPIRES ON
DATE:
CONSTRUCTION
CONSTRUCTION
CONSTRUCTION
CONSTRUCTION
CONSTRUCTION
CONSTRUCTION
AS - BUILTS
AS - BUILTS
AS - BUILTS
AS - BUILTS
AS - BUILTS
AS - BUILTS
Project
Client
Plot Date: 17 October 2025 - 10:45 AM \\ghdnet\ghd\US\Bowie\Projects\565\12571916\Digital_Design\ACAD\Sheets\12571916-GHD-XX-XX-DRG-M-0003.dwgPlotted By: Kristopher Larson
Bar is one inch on original size sheet
Approved Date Author Drafting Check
Designer Project Director
Project No. Date
Filename:
Drawing NumberThis document and the ideas and designs incorporated herein, as an instrument of professional service, is the property of GHD. This document may only be used by GHD’s client (and any other person who GHD has agreed can use this document) for the purpose for which it was prepared and must not be used by any other person or for any other purpose.
www.ghd.com
Title
1"
IssueNo. Checked
Design Check
Project Manager Conditions of Use
Scale Sheet
ANSI D
Size of
CHARLES COUNTY, MARYLAND
MWWTP EFFLUENT PS FORCE MAIN SURGE
MANAGEMENT SYSTEM CONSTRUCTION
T. JUNKER
J. STURDEVANT 12571916 10/2025 8
MATTAWOMAN WASTEWATER TREATMENT PLANT
5310 HAWTHORNE RD
LA PLATA, MARYLAND 20646
STANDPIPE STRUCTURES
SECTIONS
M003 7AS NOTED
L. BERRY
T. JUNKER
B. BLANCHARD
T. BIAGIOLI
B M002
SECTION
SCALE: 1/2"=1'-0"
C M002
SECTION
SCALE: 1/4"=1'-0" 0 2'-0" 8'-0"
SCALE 1/4"=1'-0" AT ORIGINAL SIZE
4'-0" 6'-0"
SCALE 1/2"=1'-0" AT ORIGINAL SIZE
1'-0" 4'-0"2'-0" 3'-0"
TO/ FROM EFFLUENT
FORCE MAIN
STANDPIPE
T/S EL 18.00±
STAINLESS STEEL
316 SAFETY CAGE
'-0
" M
IN
42" DIP EFF
(SEE NOTE 5)
SUMP PUMP
SLOPE TO SUMP
1'- 0"
MI
N
3'-0"
MIN
1'-0"
MIN
RESTRAINED
DISMANTLING JOINT
PIPE STAND (AS NEEDED)
CONCRETE VALVE VAULT
(SEE NOTE 3)
FLUSH WITH GRADE
T/S EL 17.50±
℄ EL 8.25±
PERSONNEL ACCESS
DUAL 24" OVERFLOW
(SEE NOTE 5)
OVERFLOW SCUPPER
BOX INV EL 123.00±
JOG STAIRCASE AROUND
OVERFLOW (TYP)
SPIRAL STAIRCASE
(SEE NOTE 1)
BLOWOFF PANELS
(TYP) (SEE NOTE 2)
BOTTOM SLAB
SHALL SLOPE
TO SUMP
(SEE NOTE 4)
10" SUMP DRAIN
MANWAY(S) ACCESSIBLE FROM
GRADE. LOCATION AND SIZE TBD
TO WET WELL
℄ EL BY THE
DESIGN-BUILDER 42" DIP, EFF
℄ EL 8.25±
WALL PENETRATION PER
SPECIFICATIONS (TYP)
WALL PENETRATION PER
SPECIFICATIONS (TYP)
SLAB PENETRATION PER
SPECIFICATIONS (TYP)
MAX WSE 123.00
RESTRAINED EXPANSION JOINT
(SEE NOTE 7)
VALVE SUPPORT
EXISTING
PUMPING STATION
54"x42"
WYE
THRUST BLOCK THRUST BLOCK
36" GATE VALVE
42"x36" REDUCER
MECHANICAL
COUPLING
11.0 FT FLOOD ELEVATION
100 YEAR FLOODPLAIN
EFFLUENT
VALVE VAULT
INFLUENT
VALVE VAULT
STANDPIPE
(T/S EL 18.00)
SCALE: 1"=10'-0"
EXISTING SITE PLAN
0 20'
SCALE 1" = 10' AT ORIGINAL SIZE
15105
GHD Inc.
16701 Melford Boulevard, Suite 330 Bowie MD 20715 USA T 1 240 206 6810 F 1 240 206 6811 W www.ghd.com
1 BRIDGING DOCUMENTS TM HJS 10/17/25
CHARLES COUNTY GOVERNMENT
DEPARTMENT OF PLANNING AND GROWTH MANAGEMENT
DEVELOPMENT SERVICES DIVISION
APPROVED FOR: REMARKS OR CONDITIONS
AS - BUILTSCONSTRUCTIONGRADING
ROADS
STORM DRAINAGE
STORMWATER
MANAGEMENT
WATER
SEWER
OTHER
DATESIGNED
THIS PERMIT EXPIRES ON
DATE:
CONSTRUCTION
CONSTRUCTION
CONSTRUCTION
CONSTRUCTION
CONSTRUCTION
CONSTRUCTION
AS - BUILTS
AS - BUILTS
AS - BUILTS
AS - BUILTS
AS - BUILTS
AS - BUILTS
Project
Client
Plot Date: 16 October 2025 - 9:58 AM G:\565\12571916\Digital_Design\ACAD\Sheets\12571916-GHD-XX-XX-DRG-E-0001.dwgPlotted By: Kristopher Larson
Bar is one inch on original size sheet
Approved Date Author Drafting Check
Designer Project Director
Project No. Date
Filename:
Drawing NumberThis document and the ideas and designs incorporated herein, as an instrument of professional service, is the property of GHD. This document may only be used by GHD’s client (and any other person who GHD has agreed can use this document) for the purpose for which it was prepared and must not be used by any other person or for any other purpose.
www.ghd.com
Title
1"
IssueNo. Checked
Design Check
Project Manager Conditions of Use
Scale Sheet
ANSI D
Size of
CHARLES COUNTY, MARYLAND
MWWTP EFFLUENT PS FORCE MAIN SURGE
MANAGEMENT SYSTEM CONSTRUCTION
T. JUNKER
J. STURDEVANT 12571916 10/2025 8
MATTAWOMAN WASTEWATER TREATMENT PLANT
5310 HAWTHORNE RD
LA PLATA, MARYLAND 20646
ELECTRICAL SITE PLAN
E001 8AS NOTED
L. BERRY
T. JUNKER
B. BLANCHARD
T. BIAGIOLI
N
NOTES:
1. DRAWING DOES NOT INCLUDE ALL INSTRUMENTS AND SENSORS THAT ARE REQUIRED.
2. DUCTBANKS, JUNCTION BOXES AND PULL BOXES ARE NOT SHOWN.
3. ALL STRUCTURES SHALL BE GROUNDED.
4. LIGHTING SHALL BE PROVIDED AROUND THE STANDPIPE, VAULTS, AND WITHIN THE VAULTS.
5. LIGHTING SHALL BE PROVIDED ON STANDPIPE AS REQUIRED BY FAA.
6. PROVIDE CONTROL PANELS NEAR THE BASE OF THE STANDPIPE. THE CONTROL PANELS
SHALL BE MOUNTED TO A FREESTANDING EQUIPMENT MOUNTING RACK WITH POSTS
ANCHORED INTO A RAISED CONCRETE PAD. A VALVE CONTROL PANEL SHALL BE PROVIDED
TO OPEN AND CLOSE THE THREE MOTORIZED GATE VALVES. ADDITIONALLY, PLACE EACH
SUMP PUMP CONTROL PANEL IN THIS LOCATION.
7. NEW ELECTRICAL EQUIPMENT AND INSTRUMENTATION TO BE FED FROM LIGHTING
PANELBOARDS LP-1 AND LP-2 LOCATED IN THE EFFLUENT PUMP STATION ELECTRICAL
ROOM. DESIGN BUILDER TO COORDINATE WITH THE COUNTY AND DETERMINE THE EXACT
LOCATION OF ELECTRICAL FEED AND AVAILABLE CAPACITY.
8. I/O FOR NEW INSTRUMENTATION TO BE WIRED TO EXISTING CONTROL PANELS IN THE
EFFLUENT PUMP STATION, INCLUDING PS-RIO AND PS-CP. DESIGN BUILDER TO
COORDINATE WITH THE COUNTY AND DETERMINE THE EXACT LOCATION TO WIRE I/O.
LS
M M
M
LS
LS
LSLSLS
LE
ZS
MOTORIZED GATE
VALVE (TYP OF 3)
SUMP PUMP
(TYP OF 3)
FLOAT LSHH, LSH,
LSL (TYP OF 3) M M
M
BLOWOFF PANEL POSITION
SWITCHES (TYP FOR EACH)
RADAR
FLOAT LSHH
FLOAT LSH
FLOAT LSL ELECTRICAL PANELS
(SEE NOTE 6)
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