BD7579A23_Duckett_Drawings.pdf
PDF 6 MB Posted
- Attached to
- Piezometer Automation at WSSC Water Dams
- Solicitation number
- 1239
- Issued by
- Prince George's County, Maryland
About this file
This document comprises engineering drawings for the Automated Data Acquisition System (ADAS) of piezometers at T. Howard Duckett Dam in the Patuxent North basin, spanning Prince George's and Howard Counties, Maryland, prepared by AECOM Technical Services Inc. under contract for the Washington Suburban Sanitary Commission (WSSC Water). The project involves installing automated monitoring systems at four piezometer locations (D-1 through D-4) to collect real-time groundwater and seepage data from the dam. The scope of work includes extending existing piezometer riser pipes, attaching Keller terminal enclosures, installing liquid-tight and PVC Schedule 80 conduit runs from each piezometer location to a centralized PLC (Programmable Logic Controller) data logger housed in an existing utility shed on Buttress 8, and pulling sensor cables through the conduit network. The installation details specify varying riser pipe diameters (2.5 inches for D-1 and D-4; 3.0 inches for D-2 and D-3), with sensors positioned six inches above the bottom of each existing piezometer. The conduit routing follows the dam profile from individual piezometer locations to the catwalk system, with distances ranging from 11 feet to 25 feet from piezometer to buttress, and total cable lengths varying from approximately 358 feet to 459 feet depending on location.
The engineering plans detail comprehensive construction sequencing, material specifications, and system architecture requirements. All conduit must be PVC Schedule 80 with expansion fittings installed per NEMA PRP 4-2009 standards and National Electric Code Section 347-9. The Keller Acculevel sensors operate on 4-20mA output with a 0-50 PSI level sensing range, connected via two-wire current loop configuration to the central PLC enclosure. The contractor is responsible for verifying existing conditions prior to construction, conducting field surveys to establish as-built elevations and pressure sensor depths, and sensor accuracy verification under the direction of WSSC's process engineer. Cable penetrations into the PLC control enclosure must enter at the lowest possible point on the side or through the bottom, with three feet of slack cable left inside the enclosure for WSSC's connections, and all sensor cables must be permanently marked with corresponding piezometer identification numbers. Professional certification by Maryland-licensed Professional Engineer Bob Pinciotti (License No. 21984, expiration 05/24/2026) confirms compliance with state regulations and design standards.
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ENGINEER:
MONTGOMERY CO.
ADEQUATE SURVEY
NO
200'S OF
CONTRACT
DATE
DATE STARTED
DATE FINALED
Drawing No.
FINALED BY
DATE COMPLETED
TYPE MANHOLES
TYPE PIPE W.
1. thru Plans/Profiles/Details
Description
P.G.CO.D.P.W.&T.
SED. CONTROL
CONTRACT MANAGER
INSPECTOR
CONTRACTOR
L & G
AS BUILT DATA
TOWN NOTIFICATION
STATE HGWY. ADM.
STATE BD. HEALTH
PERMIT REQUIREMENTS
FEDERAL AID
M.N.C.P.&P.C.
WETLANDS / WATERWAYS
TREE
DATE REVISIONS
PAGECo. GRID
VICINITY MAP
ON PROP. R/W REQ'D
OFF PROP. R/W REQ'D
S.
THESE DOCUMENTS CONTAIN PRIVILEGED
AND CONFIDENTIAL INFORMATION WHICH
SHALL NOT BE REDISTRIBUTED WITHOUT
PRIOR WSSC APPROVAL
FOR LOCATION OF UTILITIES CALL 8-1-1 OR 1-800-257-7777
OR LOG ON TO www.call811.com or www.missutility.net 48
HOURS IN ADVANCE OF ANY WORK IN THIS VICINITY
OTHER UTILITIES
*TO BE ACQUIRED BY APPLICANT
PRINCE
GEORGE'S/
HOWARD PAGE# GRID#
DRAWING INDEX
TYPE OF PIPE TYPE OF PIPE
TYPE OF MANHOLES
DRAWN
CHECK
ENGINEERING & ENVIRONMENTAL
SERVICES DIVISION
SECTION MANAGER
CIVIL SUPPORT SERVICES SECTION
DRAWN
CHECK
DATE DIVISION MANAGER
VE
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WASHINGTON SUBURBAN SANITARY COMMISSION
WSSC
DELIVERING THE ESSENTIAL
LOCATION MAP
WASHINGTON SUBURBAN SANITARY COMMISSION
14501 SWEITZER LANE, LAUREL MARYLAND 20707
AUTOMATED DATA ACQUISITION SYSTEM OF PIEZOMETERS
AT T. HOWARD DUCKETT DAM
BASIN: PATUXENT NORTH
PRINCE GEORGE'S / HOWARD COUNTIES, MARYLAND
SCALE: 1" = 2,000'
SCALE: 1" = 8 MILES
PROJECT LOCATION
DUCKETT DAM LOCATION
SHEET NUMBER
SHEET INDEX
SHEET TITLE
COVER SHEET
INSTRUMENTATION PLAN
PIEZOMETER INSTALLATION DETAILS D-1 THROUGH D-4
ADAS SYSTEM ARCHITECTURE
CONDUIT ROUTE ON PROFILE
WIRING AND CONDUIT SCHEDULE
REQUIRED - N
NOT APPLICABLE
REQUIRED - N
REQUIRED - N
REQUIRED - N
REQUIRED - N
REQUIRED - N
REQUIRED - N
REQUIRED - N
REQUIRED - N
BD7579A23
221NE07
ELECTION DISTRICT: 1
COVER SHEET
AUTOMATED DATA ACQUISITION SYSTEMS OF PIEZOMETERS AT
T. HOWARD DUCKETT DAM
BASIN: PATUXENT NORTH, PRINCE GEORGE'S COUNTIES, MARYLAND
PROFESSIONAL CERTIFICATION
I HEREBY CERTIFY THAT THESE DOCUMENTS WERE PREPARED
OR APPROVED BY ME, AND THAT I AM A DULY LICENSED
PROFESSIONAL ENGINEER UNDER THE LAWS OF THE STATE OF
MARYLAND.
LICENSE NO.: 21984 EXPIRATION DATE: 05/24/2026
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NAME: AECOM TECHNICAL SERVICES INC.
ADDRESS: 12420 MILESTONE CENTER DRIVE, SUITE 150
GERMANTOWN, MD 20876
PHONE: 301-944-2545
CONTACT: BOB PINCIOTTI, P.E.
06/03/25 - PLOT DATE
Digitally signed by Pinciotti, Bob DN: cn=Pinciotti, Bob, ou=USGRM2, email=bob.pinciotti@aecom.com Date: 2025.06.03 15:11:35 -04'00'
Pinciotti, Bob
Docusign Envelope ID: DC2B040F-2F15-4264-9777-357212A59517
Jun 11, 2025 | 9:25 AM EDT
Jun 13, 2025 | 7:06 AM EDT
DATE REVISIONS
ADEQUATE SURVEY
NO
200'S OF
CONTRACT
ON PROP. R/W REQ'D
OFF PROP. R/W REQ'D
OTHER UTILITIES
DRAWN
CHECK
THESE DOCUMENTS CONTAIN PRIVILEGED
AND CONFIDENTIAL INFORMATION WHICH
SHALL NOT BE REDISTRIBUTED WITHOUT
PRIOR WSSC APPROVAL VE
R
IF
Y
SC
AL
E
- B
AR
IS
O
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IN
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ENGINEER:
DATE REVISIONS
ADEQUATE SURVEY
NO
200'S OF
CONTRACT
ON PROP. R/W REQ'D
OFF PROP. R/W REQ'D
OTHER UTILITIES
DRAWN
CHECK
THESE DOCUMENTS CONTAIN PRIVILEGED
AND CONFIDENTIAL INFORMATION WHICH
SHALL NOT BE REDISTRIBUTED WITHOUT
PRIOR WSSC APPROVAL VE
R
IF
Y
SC
AL
E
- B
AR
IS
O
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IN
C
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A C
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IN
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ENGINEERING & ENVIRONMENTAL
SERVICES DIVISION
WASHINGTON SUBURBAN SANITARY COMMISSION
WSSC
DELIVERING THE ESSENTIAL
NOTES:
1. At each piezometer location, piezometer sensor cable runs from the riser pipe to an enclosure mounted on the riser pipe. See Piezometer Installation Details.
2. Liquid-tight conduit runs from each riser-mounted enclosure to buttress. PVC conduit runs from buttress to catwalk.
3. PVC conduit runs along catwalk to the PLC location in the utility shed.
4. All conduit shall be PVC Schedule 80.
5. PLC/Data Logger and enclosure to be provided and installed by the WSSC.
6. Buttress are 30-feet center to center.
Legend
New Piezometer Sensor
Conduit Run
INSTRUMENTATION PLAN PIEZOMETERS
AND CONDUIT RUNS
PLC/datalogger located in existing utility shed
PROFESSIONAL CERTIFICATION
I HEREBY CERTIFY THAT THESE DOCUMENTS WERE PREPARED
OR APPROVED BY ME, AND THAT I AM A DULY LICENSED
PROFESSIONAL ENGINEER UNDER THE LAWS OF THE STATE OF
MARYLAND.
LICENSE NO.: 21984 EXPIRATION DATE: 05/24/2026
Z:
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6221NE07
AUTOMATED DATA ACQUISITION SYSTEMS OF PIEZOMETERS AT
T. HOWARD DUCKETT DAM
BASIN: PATUXENT NORTH, PRINCE GEORGE'S COUNTIES, MARYLAND
BD7579A23
D-1 D-3
D-4
D-2
CatwalkCatwalk
NOTE:
EXISTING CONDITIONS/FACILITY SHOWN ON PLAN VIEW HEREON ARE BASED
ON AVAILABLE DESIGN RECORDS AND MAY NOT REFLECT CURRENT EXISTING
CONDITIONS. CONTRACTOR IS RESPONSIBLE FOR VERIFYING ALL EXISTING
CONDITIONS PRIOR TO ANY CONSTRUCTION WORK. CONTRACTOR TO NOTIFY
THE ENGINEER AND WSSC PROJECT MANAGER IF ANY DISCREPANCIES OR
CONFLICTS EXIST.
NAME: AECOM TECHNICAL SERVICES INC.
ADDRESS: 12420 MILESTONE CENTER DRIVE, SUITE 150
GERMANTOWN, MD 20876
PHONE: 301-944-2545
CONTACT: BOB PINCIOTTI, P.E.
SUGGESTED CONSTRUCTION SEQUENCE:
1. At Piezometer D-1 through D-4 location:
a. Extend existing piezometers at least one foot above the existing top of the piezometer pipe.
b. Attach the Keller terminal enclosures onto the piezometer pipe.
c. Install PVC conduit onto the nearest abutment wall, up to and then along downstream handrails of the concrete catwalk between enclosure locations.
2. Extend conduit from piezometer D-1 enclosure to the new PLC enclosure installed by WSSC in the existing utility shed located on Buttress 8.
3. Install cable between the piezometer locations by pulling cable through the conduit.
4. Install Keller piezometer transducers by measuring cable and marking depth of sensor from top of riser. Set cap with cable grip at the mark and lower transducer into well riser.
5. Splice the sensor cable to the cable that runs back to the datalogger/PLC in the existing utility shed.
6. Contractor shall verify the accuracy of all sensors at the direction of WSSC's process engineer.
30' between buttress center-lines (typ.)
06/03/25 - PLOT DATE
Digitally signed by Pinciotti, Bob DN: cn=Pinciotti, Bob, ou=USGRM2, email=bob.pinciotti@aecom.com Date: 2025.06.03 15:11:59 -04'00'
Pinciotti, Bob
Docusign Envelope ID: DC2B040F-2F15-4264-9777-357212A59517
ADEQUATE SURVEY
NO
200'S OF
CONTRACT
ON PROP. R/W REQ'D
OFF PROP. R/W REQ'D
OTHER UTILITIES
DRAWN
CHECK
THESE DOCUMENTS CONTAIN PRIVILEGED
AND CONFIDENTIAL INFORMATION WHICH
SHALL NOT BE REDISTRIBUTED WITHOUT
PRIOR WSSC APPROVAL VE
R
IF
Y
SC
AL
E
- B
AR
IS
O
N E
IN
C
H O
N O
R
IG
IN
AL
D R
AW
IF
N O
T O
N E
IN
C
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N T
H
IS
S H
EE
T, A D
JU
ST
S C
AL
ES
A C
C O
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IN
G
LY
ENGINEER:
DATE REVISIONS
ADEQUATE SURVEY
NO
200'S OF
CONTRACT
ON PROP. R/W REQ'D
OFF PROP. R/W REQ'D
OTHER UTILITIES
DRAWN
CHECK
THESE DOCUMENTS CONTAIN PRIVILEGED
AND CONFIDENTIAL INFORMATION WHICH
SHALL NOT BE REDISTRIBUTED WITHOUT
PRIOR WSSC APPROVAL VE
R
IF
Y
SC
AL
E
- B
AR
IS
O
N E
IN
C
H O
N O
R
IG
IN
AL
D R
AW
IF
N O
T O
N E
IN
C
H O
N T
H
IS
S H
EE
T, A D
JU
ST
S C
AL
ES
A C
C O
R D
IN
G
LY
ENGINEERING & ENVIRONMENTAL
SERVICES DIVISION
WASHINGTON SUBURBAN SANITARY COMMISSION
WSSC
DELIVERING THE ESSENTIAL
PROFESSIONAL CERTIFICATION
I HEREBY CERTIFY THAT THESE DOCUMENTS WERE PREPARED
OR APPROVED BY ME, AND THAT I AM A DULY LICENSED
PROFESSIONAL ENGINEER UNDER THE LAWS OF THE STATE OF
MARYLAND.
LICENSE NO.: 21984 EXPIRATION DATE: 05/24/2026
Z:
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6221NE07
AUTOMATED DATA ACQUISITION SYSTEMS OF PIEZOMETERS AT
T. HOWARD DUCKETT DAM
BASIN: PATUXENT NORTH, PRINCE GEORGE'S COUNTIES, MARYLAND
BD7579A23
NOT TO SCALE
3/8" stainless steel U-bolt, nut, washer, and lock washer
½” liquid-tight conduit to the nearest buttress
¼” cable grip
Enclosure mounting plate
Signal cable
1.5” Brass Wye 1.5” x 0.25" Male to Female brass Hex reducing bushing
IP 68 cable gland 0.25" thread
Sensor cable routed to enclosure
Pipe fitted to 2.5" diameter for Piezometers D-1 & D-4 3.0" diameter for Piezometers D-2 & D-3
1.5” Brass nipple 3" long
1.5” Bronze ball valve with stainless steel ball
NOTES:
1. Piezometers D-1 and D-4 riser pipes are 2.5" diameter.
2. Piezometers D-2 and D-3 riser pipes are 3" diameter.
3. Liquid-tight conduit runs from each riser-mounted enclosure to buttress. PVC conduit runs from buttress to catwalk.
4. PVC conduit runs along catwalk to the PLC location in the utility shed.
Keller termination enclosure
PIEZOMETER INSTALLATION DETAILS
D-1 THROUGH D-4
2.5" to 1.5" reducer for Piezometers D-1 & D-4 3.0" to 1.5" reducer for Piezometers D-2 & D-3
7.
" 3.74"
1.5” diameter
NAME: AECOM TECHNICAL SERVICES INC.
ADDRESS: 12420 MILESTONE CENTER DRIVE, SUITE 150
GERMANTOWN, MD 20876
PHONE: 301-944-2545
CONTACT: BOB PINCIOTTI, P.E.
As-Built top elevation
06/03/25 - PLOT DATE
Digitally signed by Pinciotti, Bob DN: cn=Pinciotti, Bob, ou=USGRM2, email=bob.pinciotti@aecom.com Date: 2025.06.03 15:12:18 -04'00'
Pinciotti, ADEQUATE SURVEY
NO
200'S OF
CONTRACT
ON PROP. R/W REQ'D
OFF PROP. R/W REQ'D
OTHER UTILITIES
DRAWN
CHECK
THESE DOCUMENTS CONTAIN PRIVILEGED
AND CONFIDENTIAL INFORMATION WHICH
SHALL NOT BE REDISTRIBUTED WITHOUT
PRIOR WSSC APPROVAL VE
R
IF
Y
SC
AL
E
- B
AR
IS
O
N E
IN
C
H O
N O
R
IG
IN
AL
D R
AW
IF
N O
T O
N E
IN
C
H O
N T
H
IS
S H
EE
T, A D
JU
ST
S C
AL
ES
A C
C O
R D
IN
G
LY
ENGINEER:
DATE REVISIONS
ADEQUATE SURVEY
NO
200'S OF
CONTRACT
ON PROP. R/W REQ'D
OFF PROP. R/W REQ'D
OTHER UTILITIES
DRAWN
CHECK
THESE DOCUMENTS CONTAIN PRIVILEGED
AND CONFIDENTIAL INFORMATION WHICH
SHALL NOT BE REDISTRIBUTED WITHOUT
PRIOR WSSC APPROVAL VE
R
IF
Y
SC
AL
E
- B
AR
IS
O
N E
IN
C
H O
N O
R
IG
IN
AL
D R
AW
IF
N O
T O
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IN
C
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N T
H
IS
S H
EE
T, A D
JU
ST
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ES
A C
C O
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IN
G
LY
ENGINEERING & ENVIRONMENTAL
SERVICES DIVISION
WASHINGTON SUBURBAN SANITARY COMMISSION
WSSC
DELIVERING THE ESSENTIAL
PROFESSIONAL CERTIFICATION
I HEREBY CERTIFY THAT THESE DOCUMENTS WERE PREPARED
OR APPROVED BY ME, AND THAT I AM A DULY LICENSED
PROFESSIONAL ENGINEER UNDER THE LAWS OF THE STATE OF
MARYLAND.
LICENSE NO.: 21984 EXPIRATION DATE: 05/24/2026
Z:
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E:
6221NE07
AUTOMATED DATA ACQUISITION SYSTEMS OF PIEZOMETERS AT
T. HOWARD DUCKETT DAM
BASIN: PATUXENT NORTH, PRINCE GEORGE'S COUNTIES, MARYLAND
BD7579A23
NOTES:
1. Piezometer sensor cable runs from the riser pipe to an enclosure mounted on the riser pipe. See Piezometer Installation Details.
2. Liquid-tight conduit runs from each riser-mounted enclosure to buttress. PVC conduit runs from buttress to catwalk.
3. See conduit and wiring schedules.
CATWALK
CONDUIT ROUTE ON DAM PROFILE
BUTTRESS 1118' FROM
PIEZOMETER
TO BUTTRESS
BUTTRESS D-1
NOT TO SCALE
BUTTRESS D-2
NOT TO SCALE
BUTTRESS D-3
NOT TO SCALE
BUTTRESS D-4
NOT TO SCALE
BUTTRESS 13
5' FROM
PIEZOMETER
TO BUTTRESS
BUTTRESS 15
20'± FROM
PIEZOMETER
TO BUTTRESS
BUTTRESS 16
25'± FROM
PIEZOMETER
TO BUTTRESS
NAME: AECOM TECHNICAL SERVICES INC.
ADDRESS: 12420 MILESTONE CENTER DRIVE, SUITE 150
GERMANTOWN, MD 20876
PHONE: 301-944-2545
CONTACT: BOB PINCIOTTI, P.E.
NOTES:
1. EXISTING CONDITIONS/ FACILITY SHOWN ON PLAN VIEW HEREON ARE BASED ON AVAILABLE DESIGN RECORDS AND MAY NOT REFLECT CURRENT EXISTING CONDITIONS. CONTRACTOR IS RESPONSIBLE FOR VERIFYING ALL EXISTING CONDITIONS PRIOR TO ANY CONSTRUCTION WORK. CONTRACTOR TO NOTIFY THE ENGINEER AND WSSC PROJECT MANAGER IF ANY DISCREPANCIES OR CONFLICTS EXIST.
2. DRAWING SHOWS THE GENERAL ALIGNMENT AND APPROXIMATE LENGTH OF THE CONDUIT FROM EACH PIEZOMETER TO THE PLC ENCLOSURE. THE EXACT ROUTES AND CABLE LENGTHS SHALL BE
DETERMINED IN THE FIELD BY THE CONTRACTOR AND MUST BE APPROVED BY WSSC.
Wall mount brackets to be field located by Contractor. Spacing shall comply with the National Electrical Code.
06/03/25 - PLOT DATE
Digitally signed by Pinciotti, Bob DN: cn=Pinciotti, Bob, ou=USGRM2, email=bob.pinciotti@aecom.com Date: 2025.06.03 15:12:33 -04'00'
Pinciotti, ADEQUATE SURVEY
NO
200'S OF
CONTRACT
ON PROP. R/W REQ'D
OFF PROP. R/W REQ'D
OTHER UTILITIES
DRAWN
CHECK
THESE DOCUMENTS CONTAIN PRIVILEGED
AND CONFIDENTIAL INFORMATION WHICH
SHALL NOT BE REDISTRIBUTED WITHOUT
PRIOR WSSC APPROVAL VE
R
IF
Y
SC
AL
E
- B
AR
IS
O
N E
IN
C
H O
N O
R
IG
IN
AL
D R
AW
IF
N O
T O
N E
IN
C
H O
N T
H
IS
S H
EE
T, A D
JU
ST
S C
AL
ES
A C
C O
R D
IN
G
LY
ENGINEER:
DATE REVISIONS
ADEQUATE SURVEY
NO
200'S OF
CONTRACT
ON PROP. R/W REQ'D
OFF PROP. R/W REQ'D
OTHER UTILITIES
DRAWN
CHECK
THESE DOCUMENTS CONTAIN PRIVILEGED
AND CONFIDENTIAL INFORMATION WHICH
SHALL NOT BE REDISTRIBUTED WITHOUT
PRIOR WSSC APPROVAL VE
R
IF
Y
SC
AL
E
- B
AR
IS
O
N E
IN
C
H O
N O
R
IG
IN
AL
D R
AW
IF
N O
T O
N E
IN
C
H O
N T
H
IS
S H
EE
T, A D
JU
ST
S C
AL
ES
A C
C O
R D
IN
G
LY
ENGINEERING & ENVIRONMENTAL
SERVICES DIVISION
WASHINGTON SUBURBAN SANITARY COMMISSION
WSSC
DELIVERING THE ESSENTIAL
PROFESSIONAL CERTIFICATION
I HEREBY CERTIFY THAT THESE DOCUMENTS WERE PREPARED
OR APPROVED BY ME, AND THAT I AM A DULY LICENSED
PROFESSIONAL ENGINEER UNDER THE LAWS OF THE STATE OF
MARYLAND.
LICENSE NO.: 21984 EXPIRATION DATE: 05/24/2026
Z:
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E:
6221NE07
AUTOMATED DATA ACQUISITION SYSTEMS OF PIEZOMETERS AT
T. HOWARD DUCKETT DAM
BASIN: PATUXENT NORTH, PRINCE GEORGE'S COUNTIES, MARYLAND
BD7579A23
D-1
D-2 D-3
D-4
ADAS SYSTEM ARCHITECTURE
Terminal Enclosure
Terminal Enclosure
Terminal Enclosure
Terminal Enclosure
Duckett Dam
NAME: AECOM TECHNICAL SERVICES INC.
ADDRESS: 12420 MILESTONE CENTER DRIVE, SUITE 150
GERMANTOWN, MD 20876
PHONE: 301-944-2545
CONTACT: BOB PINCIOTTI, P.E.
NOTES:
1. Keller Acculevel sensors have 4-20mA output and a 0-50PSI level sensing range.
(Item number: 0507.00203.051305.13)
2. The PLC Control Enclosure, PLC, instrumentation power, and barometer will be provided and installed by the WSSC.
3. Contractor shall verify the accuracy of all sensors at the direction of WSSC's process engineer.
4. Contractor shall connect the PVC conduit(s) to the PLC Control Enclosure and pull the sensor cables into the enclosure and leave three feet of sensor cable inside the enclosure for connection of the sensor cables to the PLC by the WSSC.
5. All sensor cables pulled into the PLC Control Enclosure shall be clearly and permanently marked with the appropriate piezometer number.
6. Conduit shall enters the PLC enclosure through a penetration at the lowest point possible on the side of the enclosure and if it is possible penetrate through the bottom of the enclosure. No top penetration of any conduit through enclosure shall be allowed. Locations of penetrations must be approved by WSSC.
2-wire current loop
(NTS)
2-wire current loop
(NTS)
PLC Controller Enclosure
Barometer
06/03/25 - PLOT DATE
Digitally signed by Pinciotti, Bob DN: cn=Pinciotti, Bob, ou=USGRM2, email=bob.pinciotti@aecom.com Date: 2025.06.03 15:12:53 -04'00'
Pinciotti, ADEQUATE SURVEY
NO
200'S OF
CONTRACT
ON PROP. R/W REQ'D
OFF PROP. R/W REQ'D
OTHER UTILITIES
DRAWN
CHECK
THESE DOCUMENTS CONTAIN PRIVILEGED
AND CONFIDENTIAL INFORMATION WHICH
SHALL NOT BE REDISTRIBUTED WITHOUT
PRIOR WSSC APPROVAL VE
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ENGINEER:
DATE REVISIONS
ADEQUATE SURVEY
NO
200'S OF
CONTRACT
ON PROP. R/W REQ'D
OFF PROP. R/W REQ'D
OTHER UTILITIES
DRAWN
CHECK
THESE DOCUMENTS CONTAIN PRIVILEGED
AND CONFIDENTIAL INFORMATION WHICH
SHALL NOT BE REDISTRIBUTED WITHOUT
PRIOR WSSC APPROVAL VE
R
IF
Y
SC
AL
E
- B
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ENGINEERING & ENVIRONMENTAL
SERVICES DIVISION
WASHINGTON SUBURBAN SANITARY COMMISSION
WSSC
DELIVERING THE ESSENTIAL
PROFESSIONAL CERTIFICATION
I HEREBY CERTIFY THAT THESE DOCUMENTS WERE PREPARED
OR APPROVED BY ME, AND THAT I AM A DULY LICENSED
PROFESSIONAL ENGINEER UNDER THE LAWS OF THE STATE OF
MARYLAND.
LICENSE NO.: 21984 EXPIRATION DATE: 05/24/2026
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E:
6221NE07
AUTOMATED DATA ACQUISITION SYSTEMS OF PIEZOMETERS AT
T. HOWARD DUCKETT DAM
BASIN: PATUXENT NORTH, PRINCE GEORGE'S COUNTIES, MARYLAND
BD7579A23
NOTES:
1. At each piezometer location, piezometer sensor cable runs from the riser pipe to an enclosure mounted on the riser pipe. See Piezometer Installation Details Drawing 03.
2. Liquid-tight conduit runs from each riser-mounted enclosure to buttress. PVC conduit runs from buttress to catwalk. And PVC conduit runs along the catwalk to the utility shed.
3. All PVC conduits to be Schedule 80.
4. Expansion fittings shall be included on PVC conduit runs in accordance with NEMA PRP 4-2009 (R2016) guidance and Section 347-9 of the National Electric Code.
5. Piezometer sensor shall be set 6-inches above the bottom of the existing piezometer.
6. Contractor shall survey as-built location, bottom elevation, top elevation of completed installation and calculate the elevation of the piezometer pressure sensor. Survey benchmarks are shown in the table below.
7. Drawing shows the general alignment and approximate length of the conduit from each piezometer to the PLC enclosure. The exact routes and cable lengths shall be determined in the field by the Contractor and must be approved by WSSC.
WIRING AND CONDUIT SCHEDULE
Duckett Dam Wiring Schedule
Well ID:
Top Elevation (ft)
Bottom Elevation (ft)
Cable length in standpipe (ft)
Total cable length (ft)
Cable length: standpipe to outside utility (ft)
D-1
195.3
151.0
44.3
358.3
314.0
D-2
192.0
123.8
68.2
456.2
388.0
D-3
174.5
139.3
35.2
434.2
399.0
D-4
176.5
148.9
27.6
458.6
431.0
Sch40 PVC Section
D-4 to Catwalk
1/2" Diameter
72.0 86.0
96.0
368.0 221.0
Duckett Dam Conduit Schedule
3/4" Diameter 90 Deg Turns Condulet T
Total conduit length (ft)
114.0
211.0 10.0
D-3 to Catwalk D-2 to Catwalk D-1 to Catwalk Catwalk section 15 to 08 Catwalk to PLC
Feet Feet Qty Qty
NAME: AECOM TECHNICAL SERVICES INC.
ADDRESS: 12420 MILESTONE CENTER DRIVE, SUITE 150
GERMANTOWN, MD 20876
PHONE: 301-944-2545
CONTACT: BOB PINCIOTTI, P.E.
06/03/25 - PLOT DATE
Digitally signed by Pinciotti, Bob DN: cn=Pinciotti, Bob, ou=USGRM2, email=bob.pinciotti@aecom.com Date: 2025.06.03 15:13:21 -04'00'
Pinciotti,
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| Digitally verifiable PDF exported from www.docusign.com |
File details come from the government source that posted it. Updated .