BD7581A23_Seneca_Drawings.pdf
PDF 11 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 construction drawings and specifications for the Automated Data Acquisition Systems (ADAS) of piezometers at Little Seneca Dam in Seneca Creek, Montgomery County, Maryland, prepared by the Washington Suburban Sanitary Commission (WSSC) and designed by AECOM Technical Services Inc. The project involves the installation of 19 piezometer pressure sensors (designated DP-1 through DP-19) equipped with Keller Acculevel transducers with 4-20mA output and 0-50 PSI sensing range, complemented by PVC conduit infrastructure, junction boxes, and a centralized data logging system housed in the control building. The instrumentation plan includes below-grade enclosures at each piezometer location, conduit trenches with varying diameters (ranging from 0.5 inches to 2 inches), and sensor cable runs totaling approximately 1,272 feet within the control building. The design specifies detailed installation procedures, including excavation and trenching requirements, concrete encasement specifications, and backfill protocols complying with WSSC Specification Sections 02315 (Earthwork), 02920 (Lawns-Grasses), and 02950 (Paving). A Maryland Department of the Environment Dam Safety Permit is required prior to construction, with an engineer-in-charge designated to oversee compliance with approved construction documents.
The project requires adherence to erosion and sediment control procedures per WSSC Regulations for Utility Erosion and Sediment Control, Standard Procedures, Section V, Paragraph A. Construction sequencing involves removal of existing well casings, excavation of trenches with appropriate backfill material meeting USCS Classifications GC, SC, or SM with fines content of 30 percent or greater, installation of conduit and sensor cables, and sensor verification by WSSC's Process Engineer. The contractor is responsible for verifying all existing conditions prior to construction and must notify the engineer and WSSC project manager of any discrepancies. Restoration includes turfgrass stabilization meeting Type A requirements and pavement repair sections matching existing adjacent conditions. The design documents are signed and sealed by a licensed Maryland Professional Engineer (License No. 21984, expiration date 05/24/2026) and include utility locating requirements (call 8-1-1 or 1-800-257-7777) to be performed 48 hours in advance of work.
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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.
S.C.1.
1. thru
Sediment Control Details 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
NAME: AECOM TECHNICAL SERVICES INC.
ADDRESS: 12420 MILESTONE CENTER DRIVE, SUITE 150
GERMANTOWN, MD 20876
PHONE: 301-944-2545
CONTACT: BOB PINCIOTTI, P.E.
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
MONTGOMERY PAGE# GRID#
BD7581A23
DRAWING INDEX
REQUIRED - N
NOT APPLICABLE
TYPE OF PIPE TYPE OF PIPE
TYPE OF MANHOLES
DRAWN
CHECK
ENGINEERING & ENVIRONMENTAL
SERVICES DIVISION
SECTION MANAGER
CIVIL SUPPORT SERVICES SECTION
227NW14 11
ELECTION DISTRICT: 2
COVER SHEET
AUTOMATED DATA ACQUISITION SYSTEMS OF PIEZOMETERS AT
LITTLE SENECA DAM
BASIN: SENECA CREEK, MONTGOMERY COUNTY, MARYLAND
DRAWN
CHECK
DATE DIVISION MANAGER
VE
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IF
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A
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O R
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IN
G
LY
SCALE: 1" = 8 MILES
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
WSSC Erosion and Sediment Control Approval Note This plan has been approved per requirements in the:
Standard Procedures of the WSSC Regulations for Utility Erosion and Sediment Control, Section V, Paragraph A.
Reviewed by:_________________________________________
Date:__________________ Plan No.______________________
WASHINGTON SUBURBAN SANITARY COMMISSION
14501 SWEITZER LANE, LAUREL MARYLAND 20707
AUTOMATED DATA ACQUISITION SYSTEM OF PIEZOMETERS
AT LITTLE SENECA DAM
BASIN: SENECA CREEK
MONTGOMERY COUNTY, MARYLAND
SCALE: 1" = 2,000'
PROJECT LOCATION
LOCATION MAP
PROJECT LOCATION
SHEET NUMBER
SHEET INDEX
SHEET TITLE
COVER SHEET
INSTRUMENTATION PLAN
PIEZOMETER INSTALLATION DETAILS DP-1 TO DP-7, DP-9 TO DP-19
PIEZOMETER INSTALLATION DETAIL DP-8
CONTROL BUILDING CONDUIT
ADAS SYSTEM ARCHITECTURE
JUNCTION BOX DETAILS
CONDUIT TRENCH DETAILS
WIRING AND CONDUIT SCHEDULE
PIEZOMETER DETAILS WITH WYE FITTING AND BALL VALVE
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REQUIRED - N
REQUIRED - N
REQUIRED - N
REQUIRED - N
REQUIRED - N
REQUIRED - N
REQUIRED - N
REQUIRED - N
NOTE:
CONSTRUCTION OF THESE IMPROVEMENTS REQUIRES A PERMIT ISSUED BY THE MARYLAND DEPARTMENT OF THE ENVIRONMENT DAM SAFETY PERMITS DIVISION. THE CONDITIONS OF THE PERMIT WILL INCLUDE DESIGNATION OF AN ENGINEER-IN-CHARGE TO OVERSEE THE WORK AND CONFIRM THAT THE WORK WAS
PERFORMED IN GENERAL ACCORDANCE WITH THE APPROVED CONSTRUCTION DOCUMENTS.
11SEDIMENT CONTROL DETAILS
06/03/25 - PLOT DATE
Digitally signed by Pinciotti, Bob DN: cn=Pinciotti, Bob, ou=USGRM2, email=bob.pinciotti@aecom.com Date: 2025.06.04 14:16:24 -04'00'
Pinciotti, Bob
Docusign Envelope ID: C0AD3F26-FF61-4D95-8886-BCDD3AE2A493
Jun 10, 2025 | 2:45 PM EDT
BD7581A23
Jun 11, 2025 | 9:26 AM EDT
Jun 11, 2025 | 10:46 AM EDT
0SERVICE SPILLWAY
CREST STRUCTURE
AUXILIARY SPILLWAY
CREST STRUCTURE
SERVICE SPILLWAY CHUTE
AUXILIARY SPILLWAY
EXIT CHANNEL
CONTROL
BUILDING
IN-TAKE TOWER
LOW LEVEL OUTLET
DP-14
DP-13 DP-12
DP-9
DP-15
DP-10
DP-11
DP-16
DP-17
DP-18
DP-8
DP-7
DP-6
DP-5
DP-19
DP-4
DP-3
DP-2
DP-1 7
LITTLE SENECA
RESERVOIR
CR
ES
T
OF
D
AM
EL. 390 BENCH
EL. 370 BENCH
PLC/DATA-
LOGGER LOCATED
IN CONTROL
BUILDING
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
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LY
INSTRUMENTATION PLAN:
PIEZOMETERS AND CONDUIT RUNS
DATE REVISIONS
ADEQUATE SURVEY
NO
200'S OF
CONTRACT
ON PROP. R/W REQ'D
OFF PROP. R/W REQ'D
OTHER UTILITIES
BD7581A23
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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ENGINEERING & ENVIRONMENTAL
SERVICES DIVISION
WASHINGTON SUBURBAN SANITARY COMMISSION
WSSC
DELIVERING THE ESSENTIAL
NOTE:
THIS DRAWING SHALL BE USED FOR SCHEMATIC PURPOSES.
CONTRACTOR SHALL NOT USE THIS DRAWING TO MEASURE OR
SCALE ANY DIMENSIONS.
NOTES:
1. INSTALL CONDUIT BELOW GRADE ON EMBANKMENT.
2. INSTALL CONDUIT FROM DP-1, DP-2, AND DP-14 UNDER DAM CREST ROADWAY.
3. SEE PIEZOMETER INSTALLATION DETAILS FOR CONDUIT DETAILS.
LEGEND
NEW PIEZOMETER SENSOR
CONDUIT RUN
BELOW GRADE JUNCTION BOX
AERIAL IMAGE
SCALE: 1" = 80'
AUTOMATED DATA ACQUISITION SYSTEMS OF PIEZOMETERS AT
LITTLE SENECA DAM
BASIN: SENECA CREEK, MONTGOMERY COUNTY, MARYLAND 227NW14
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: 2025.06.04 14:16:44 -04'00'
Pinciotti, Bob
Docusign Envelope ID: C0AD3F26-FF61-4D95-8886-BCDD3AE2A493
Piezometer Flush Mount Detail DP-1 through DP-7
DP-9 through DP-19
Not to Scale
Sensor cables installed through PVC conduit
4-inch wide conduit trench
Seal conduit ends with duct seal or sealing foam to prevent water intrusion
SUGGESTED CONSTRUCTION SEQUENCE:
1. Remove the well casing and concrete collar and adjust the height of the existing well casing to accommodate the below ground enclosure.
2. Excavate trenches between the piezometer locations.
3. Install conduit in trench between piezometer locations.
4. Install the below grade enclosures at each piezometer location routing conduit into enclosures.
5. Granular Material Base shall be free draining crushed rock or gravel meeting the gradation of ASTM C-33 Coarse Aggregate No. 57, or as approved by WSSC.
6. Encase enclosure in fiber-reinforced bag-mixed concrete.
7. Backfill soil in 6-inch thick (maximum before compaction) lifts and compact with hand tamping equipment. Backfill material shall be the same material as encountered during excavation. Upper 2 (minimum) and 4 (maximum) inches of backfill shall be topsoil. Reinstall riprap or asphalt per requirements.
8. Install cable between the piezometer locations by pulling cable through the conduit.
9. 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.
10. Splice the sensor cable to the cable that runs back to the datalogger/PLC in the control building.
11. Contractor shall verify the accuracy of all sensors at the direction of WSSC's Process Engineer.
" t o
" t o
20 5/16"
Existing piezometer casing is either:
1. Galvanized Iron, 1.5" DIA, 1/8" DIA holes
2. White PVC, 2.0" DIA, slotted pipe Piezometer casing type is indicated in Wiring Schedule on Drawing 09.
Concrete encasement (See Suggested Construction Sequence 6)
Sensor cable to next piezometer
Existing 1.5" galvanized iron or 2" diameter PVC standpipe from ground surface to within 6 feet of ground surface. See Wiring Schedule on Drawing 09 for conduit type.
Pressure sensor (Keller Acculevel with 4-20mA Output)
Set sensor bottom at 6" from standpipe bottom
90 degree PVC conduit sweep elbow with minimum radius 1 foot
PVC conduit. Diameter is based on number of sensor cables. See Conduit Table on Drawing 08.
Sensor cable from adjacent piezometer
(Existing riser or casing to be removed, See notes)
Below grade enclosure Hubble/Pencell PE1015 open bottom HDPE box and cover with security tamper proof screws 15"L x 10"W x 12"D
Wye and ball valve fittings.
See details on drawing sheet 10
Splice sensor cable with epoxy kit
Set enclosure surface flush with ground surface to prevent damage from surface activities such as mowing.
4-inch wide conduit trench
6" thick Granular material base (See Suggested Construction Sequence 5)
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
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IN
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IF
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IN
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A C
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IN
G
LY
ENGINEER: PIEZOMETER INSTALLATION DETAILS
DP-1 THROUGH DP-7, DP-9 THROUGH DP-19
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
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IF
N O
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IN
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EE
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JU
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AL
ES
A C
C O
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IN
G
LY
ENGINEERING & ENVIRONMENTAL
SERVICES DIVISION
WASHINGTON SUBURBAN SANITARY COMMISSION
WSSC
DELIVERING THE ESSENTIAL
BD7581A23
AUTOMATED DATA ACQUISITION SYSTEMS OF PIEZOMETERS AT
LITTLE SENECA DAM
BASIN: SENECA CREEK, MONTGOMERY COUNTY, MARYLAND 227NW14
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: 2025.06.04 14:17:03 -04'00'
Pinciotti, Sensor cables installed through PVC conduit
" t o
Galvanized Iron, 1.5" DIA, 1/8" DIA holes
Existing 1.5" galvanized iron from ground surface to within 6 feet of ground surface
90 degree PVC conduit sweep elbow with minimum radius 1 foot
Hoffman Stainless Steel Wallmount Hinged Enclosure Type 4X, 20"L x 16"W x 10"D. Catalog #A20H1610SSLP Wye and ball valve fittings.
See details on Drawing 10
Splice sensor cable with epoxy kit
Piezometer Flush Mount Detail
DP-8
Not to Scale
Pressure sensor (Keller Acculevel with 4-20mA Output)
Set sensor bottom at 6" from PVC standpipe bottom
Existing steel well casing. Contractor shall be prepared to chip concrete to remove enough of the well casing to construct the improvements.
Existing concrete baseRip rap
Secure enclosure with 38 inch diameter concrete anchors at each corner (Hilti Kwik Bolt or equal).
Minimum embedment shall be 4 inches
4-inch wide conduit trench.
See trench details
Sensor cable toward DP-7
PVC conduit. Diameter is based on number of sensor cables.
See Conduit Schedule on Drawing 09.
Rip rap
2" box conduit fitting Seal end with conduit with duct seal or sealing foam to prevent water intrusion
2" LB conduit fitting
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
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IN
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H
IS
S H
EE
T, A D
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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
PIEZOMETER INSTALLATION DETAILS
DP-8
BD7581A23
AUTOMATED DATA ACQUISITION SYSTEMS OF PIEZOMETERS AT
LITTLE SENECA DAM
BASIN: SENECA CREEK, MONTGOMERY COUNTY, MARYLAND 227NW14
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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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: 2025.06.04 14:17:22 -04'00'
Pinciotti, P L C
P L C
Quazite junction box 17"x30"x12"
PD1730BA12
polymer concrete, open bottom
PLC and PLC enclosure provided by WSSC
2" diameter PVC conduit mounted through exterior concrete wall and attached to the interior concrete walls
LB 90° condulet
PLC and PLC enclosure provided by WSSC
LB 90° condulet
LB 90° condulet
2" diameter PVC conduit mounted through exterior concrete wall and attached to the interior concrete walls
2" diameter PVC conduit mounted through exterior concrete wall and attached to the interior concrete walls
2" diameter PVC conduit to junction box across the road
Quazite junction box 17"x30"x12"
PD1730BA12
polymer concrete, open bottom
Wall mount brackets to be field located by Contractor. Spacing shall comply with the Montgomery County, Maryland Electrical Code.
Wall mount brackets to be field located by Contractor.
Spacing shall comply with the Montgomery County, Maryland Electrical Code.
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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H
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S H
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T, A D
JU
ST
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AL
ES
A C
C O
R D
IN
G
LY
ENGINEER: CONTROL BUILDING CONDUIT
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
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 IS ANY DISCREPANCIES OR
CONFLICTS EXIST.
OPERATING FLOOR PLAN - EL. 408.50
SECTION VIEW
BD7581A23
AUTOMATED DATA ACQUISITION SYSTEMS OF PIEZOMETERS AT
LITTLE SENECA DAM
BASIN: SENECA CREEK, MONTGOMERY COUNTY, MARYLAND 227NW14
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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EN
AM
E:
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: 2025.06.04 14:17:36 -04'00'
Pinciotti, PLC Controller Enclosure
Barometer
Little Seneca Dam
DP-1 DP-2 DP-3 DP-4 DP-5 DP-6 DP-7 DP-8 DP-9 DP-10 DP-11 DP-12 DP-13 DP-14 DP-15 DP-16 DP-17 DP-18 DP-19
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
H O
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H
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S H
EE
T, A D
JU
ST
S C
AL
ES
A C
C O
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IN
G
LY
ENGINEER: ADAS SYSTEM ARCHITECTURE
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
BD7581A23
AUTOMATED DATA ACQUISITION SYSTEMS OF PIEZOMETERS AT
LITTLE SENECA DAM
BASIN: SENECA CREEK, MONTGOMERY COUNTY, MARYLAND 227NW14
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:
\G
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TO
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AS
S
YS
TE
M A
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ET
C U
R E.
D W
G
PA
TH
/F
IL
EN
AM
E:
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 Engineering.
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 enter 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)
06/03/25 - PLOT DATE
Digitally signed by Pinciotti, Bob DN: cn=Pinciotti, Bob, ou=USGRM2, email=bob.pinciotti@aecom.com Date: 2025.06.04 14:17:53 -04'00'
Pinciotti, Junction Box 2-7 Flush Mount Detail
Not to Scale
Sensor cables installed through 2" PVC conduit
Conduit trench 3" wide
Sensor cables to next piezometer or junction box
Seal conduit ends with duct seal or sealing foam to prevent water intrusion
NOTES:
1. Junction Boxes 1, 4, and 6 will have two conduits at the box.
2. Junction Boxes 3, 5, and 7 will have three conduits at the box.
3. Junction Box 2 will have four conduits at the box.
4. See Drawing 02 for conduit configuration.
5. All PVC conduit to be Schedule 80.
Set enclosure flush with ground surface to prevent damage from activities such as mowing.
Junction Box 1 Flush Mount Detail
Not to Scale
" t o
" t o
4-inch wide conduit trench
15"
90 degree PVC conduit sweep elbow with minimum radius 1 foot
PVC conduit. Diameter is based on number of sensor cables.
See Notes for number of conduits entering junction box.
See Conduit Table on Drawing 08 for conduit diameters and lengths.
Sensor cables from adjacent piezometers
2" LB 90° condulets
Concrete and masonry outer wall of the Control Building near northeast corner of the building
" t o
" t o
Set enclosure surface flush with pavement surface to prevent tripping hazard.
Below grade enclosure Quazite junction box
17"x30"x12" PD1730BA12 polymer concrete, open bottom
90 degree PVC conduit sweep elbow with minimum radius 1 foot
Seal conduit ends with duct seal or sealing foam to prevent water intrusion
Conduit trench 3" wide
Sensor cables from junction box 2
Below grade enclosure Hubbell/Pencell PE1015 open bottom HDPE box and cover with security tamper proof screws 15"L x 10"W x 12"D
PVC conduit, 2" Diameter
30"
6"
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
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H
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S H
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T, A D
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A C
C O
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IN
G
LY
ENGINEER: JUNCTION BOX DETAILS
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
BD7581A23
AUTOMATED DATA ACQUISITION SYSTEMS OF PIEZOMETERS AT
LITTLE SENECA DAM
BASIN: SENECA CREEK, MONTGOMERY COUNTY, MARYLAND 227NW14
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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2\ D
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\W
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_8 \9
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JB
O X_
D
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AI
LS
.D W
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PA
TH
/F
IL
EN
AM
E:
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: 2025.06.04 14:18:10 -04'00'
Pinciotti, Soil/Grass Surface
NOTES:
1. See Conduit Schedule in Drawing 09 for conduit sizes.
Turfgrass Stabilization to comply with WSSC Specification Section 02920 as noted in this drawing.
Backfill to comply with WSSC Specification Section 02315 as noted on this drawing.
Relocate riprap prior to construction of trench and replace riprap after backfilling of trench.
Riprap to comply with WSSC Specification Section 02370 as noted on this drawing.
Conduit Trench Details Not to Scale
4"
PVC conduit PVC conduit
Rip-Rap Surface
4"
Unknown thickness
Roadway Surface
PVC conduit
4"
12"
Backfill to comply with WSSC Specification Section 02315 as noted on this drawing.
Pavement and Pavement Base shall comply with WSSC Specifications Section 02950 as noted on this drawing.
Backfill to comply with WSSC Specification Section 02315 as noted on this drawing.
Note:
See Specification notes for Paving on this drawing.
Dimensions denoted with "*" shall be determined in the field and match adjacent pavement thicknesses.
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
ENGINEER: CONDUIT TRENCH DETAILS
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
BD7581A23
AUTOMATED DATA ACQUISITION SYSTEMS OF PIEZOMETERS AT
LITTLE SENECA DAM
BASIN: SENECA CREEK, MONTGOMERY COUNTY, MARYLAND 227NW14
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:
\G
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AN
TO
W N
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SG
R M
2\ D
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PR
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C
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\W
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\6
2_
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AM
SB
O A_
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_8 \9
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ES
EN
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.D
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/F
IL
EN
AM
E:
HOT MIX ASPHALT (HMA) PATCH
List of Applicable WSSC Specifications
Section Title Modifications/Clarifications to Specification
02315 Earthwork for Pipeline Construction Excavated soil from trench that contains grass, roots, and organic material shall be disposed of off site.
Imported backfill shall meet USCS Classifications GC, SC, or SM with fines content greater than or equal to 30%.
Backfill shall be loosely placed in uncompacted lifts of no greater than 6-inches. Moisture content shall be within +/-2% of the optimum. Fill shall be sufficiently compacted, with mechanical or hand tampers of appropriate size, to prevent post-construction settlement.
02920 Lawns-Grasses Restoration shall meet specification requirements for Type A.
02950 Paving Requirements Repaired pavement section shall match existing pavement section adjacent to repair site.
NAME: AECOM TECHNICAL SERVICES INC.
ADDRESS: 12420 MILESTONE CENTER DRIVE, SUITE 150
GERMANTOWN, MD 20876
PHONE: 301-944-2545
CONTACT: BOB PINCIOTTI, P.E.
05/16/25 - PLOT DATE
Digitally signed by Pinciotti, Bob DN: cn=Pinciotti, Bob, ou=USGRM2, email=bob.pinciotti@aecom.com Date: 2025.06.04 14:18:26 -04'00'
Pinciotti, Soil/Grass Surface
NOTES:
1. See Conduit Schedule in Drawing 09 for conduit sizes.
Turfgrass Stabilization to comply with WSSC Specification Section 02920 as noted in this drawing.
Backfill to comply with WSSC Specification Section 02315 as noted on this drawing.
Relocate riprap prior to construction of trench and replace riprap after backfilling of trench.
Riprap to comply with WSSC Specification Section 02370 as noted on this drawing.
Conduit Trench Details Not to Scale
4"
PVC conduit PVC conduit
Rip-Rap Surface
4"
Unknown thickness
Roadway Surface
PVC conduit
4"
12"
Backfill to comply with WSSC Specification Section 02315 as noted on this drawing.
Pavement and Pavement Base shall comply with WSSC Specifications Section 02950 as noted on this drawing.
Backfill to comply with WSSC Specification Section 02315 as noted on this drawing.
Note:
See Specification notes for Paving on this drawing.
Dimensions denoted with "*" shall be determined in the field and match adjacent pavement thicknesses.
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
ENGINEER: CONDUIT TRENCH DETAILS
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
BD7581A23
AUTOMATED DATA ACQUISITION SYSTEMS OF PIEZOMETERS AT
LITTLE SENECA DAM
BASIN: SENECA CREEK, MONTGOMERY COUNTY, MARYLAND 227NW14
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:
\G
ER
M
AN
TO
W N
-U
SG
R M
2\ D
C S\
PR
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JE
C
TS
\W
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\6
2_
_W
SS
C _D
AM
SB
O A_
TA
SK
O R
D
ER
_8 \9
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_G
IS
\9
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AD
\L
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TL
ES
EN
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A_
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IN
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_L
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TL
ES
EN
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A_
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EN
C
H _D
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AI
LS
.D
W G
PA
TH
/F
IL
EN
AM
E:
HOT MIX ASPHALT (HMA) PATCH
List of Applicable WSSC Specifications
Section Title Modifications/Clarifications to Specification
02315 Earthwork for Pipeline Construction Excavated soil from trench that contains grass, roots, and organic material shall be disposed of off site.
Imported backfill shall meet USCS Classifications GC, SC, or SM with fines content greater than or equal to 30%.
Backfill shall be loosely placed in uncompacted lifts of no greater than 6-inches. Moisture content shall be within +/-2% of the optimum. Fill shall be sufficiently compacted, with mechanical or hand tampers of appropriate size, to prevent post-construction settlement.
02920 Lawns-Grasses Restoration shall meet specification requirements for Type A.
02950 Paving Requirements Repaired pavement section shall match existing pavement section adjacent to repair site.
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: 2025.06.04 14:18:43 -04'00'
Pinciotti, 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
ENGINEER: Conduit and Wiring Schedule
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
Wiring Schedule
Well ID:
Top Elevation (ft) Bottom Elevation (ft)
Cable length in standpipe (ft)
Total cable length (ft)
Cable length: standpipe to outside building face (ft)
DP-1A
414.2 340.3
71.7
706.7
635.0
DP-2
404.4 320.0
84.4
799.4
715.0
DP-3
409.0 350.0
59.0
532.0
473.0
DP-4A
392.6 356.6
36.2
530.2
494.0
DP-5A
409.4 317.4
99.4
448.4
349.0
DP-6A
391.2 319.2
74.6
444.6
370.0
Schedule 80 PVC Section Lengths
DP-1 to DP-2
1/2" Diameter
110.0
126.0
Conduit Schedule
1.25" Diameter 2" Diameter Notes
DP-1 to DP-3 DP-3 to DP-5 DP-5 to DP-10 DP-10 to DP-15 J-Box
Casing length (ft)
DP-7
369.6 316.0
53.6
446.6
393.0
DP-8
349.7 316.0
33.7
487.7
454.0
DP-9
338.7 316.0
22.7
483.7
461.0
DP-10
408.9 340.0
68.9
238.9
170.0
DP-11
391.0 355.0
36.0
230.0
194.0
DP-12
370.0 320.0
50.0
355.0
305.0
DP-13
388.9 340.0
48.9
211.9
163.0
DP-14
407.6 320.0
87.6
209.6
122.0
DP-15
398.7 370.7
28.0
194.0
166.0
DP-16
379.5 356.5
23.0
265.0
242.0
DP-17
379.3 341.3
38.0
329.0
291.0
DP-18
390.7 342.7
48.0
342.0
294.0
DP-19
379.4 341.4
38.0
526.0
488.0
1" Diameter
84.0
3/4" Diameter
45.0
90 Deg Turns Feet Feet Feet Feet Feet
DP-6 to DP-18
20.0
22.0
DP-18 to DP-11
J-Box 3 to J-Box 2 DP-19 to T-Box T-Box to DP-7
54.0
1/2" Condulet RB 128.0
DP-17 to T-Box
69.0 62.0
16.0
160.0
DP-17 to DP-16 T DP-16 to T Box DP-16 to J-Box 4 J-Box 4 to J-Box 3 DP-9 to DP-12
16.0
1 3/4" Condulet T
65.0 61.0
98.0
60.0
145.0
DP-14 to J-Box 5 57.0
J-Box 5 to J-Box 2
Inside Control Building
Total Cable Length (ft) 54.0
70.0 40.0
110.0
2" Elbows or Condulets
210.01272.0
DP-4 to DP-6
DP-8 to DP-7 DP-7 to DP-17 T-Box
DP-12 to DP-13 DP-13 to J-Box 5
DP-15 to DP-15 J-Box DP-15 to DP-15 J-Box 2
DP-11 to J-Box 3
J-Box 2 to J-Box 1
658.0
52.0
90.0 100.0
76.0
180.0 124.0 174.0
1 3/4" Condulet T 1 1/2" Condulet T
BD7581A23
AUTOMATED DATA ACQUISITION SYSTEMS OF PIEZOMETERS AT
LITTLE SENECA DAM
BASIN: SENECA CREEK, MONTGOMERY COUNTY, MARYLAND 227NW14
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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Casing Material PVC GI GI GI GI GI GI GI GI GI GI PVC PVC PVC PVC PVC
Notes:
1. GI denotes Galvanized Iron.
2. All PVC conduits shall be Schedule 80.
3. Piezometer sensor shall be set 6 inches above the bottom of the existing piezometer.
4. 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.
5. 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.
NAME: AECOM TECHNICAL SERVICES INC.
ADDRESS: 12420 MILESTONE CENTER DRIVE, SUITE 150
GERMANTOWN, MD 20876
PHONE: 301-944-2545
CONTACT: BOB PINCIOTTI, P.E.
PVC PVC PVC
73.8 36.2 93.2 72.284.7 60.5 36.0 34.5 23.5 70.1 37.2 49.7 49.8 86.8 28.3 24.3 38.3 48.0 38.3
06/03/25 - PLOT DATE
Digitally signed by Pinciotti, Bob DN: cn=Pinciotti, Bob, ou=USGRM2, email=bob.pinciotti@aecom.com Date: 2025.06.04 14:19:02 -04'00'
Pinciotti, 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 junction box 1.5” Brass nipple
3" long
1.5” Bronze ball valve with stainless steel ball
NOT TO SCALE
Existing piezometer is either:
1. Galvanized Iron, 1.5" DIA, 1/8" diameter holes
2. White PVC, 2.0" diameter slotted pipe. See
Wiring Schedule on Drawing 09 for conduit type.
2.0" PVC Piezometer:
Use: 1 1/2-inch x 2-inch PVC DWV Hub x Hub Increase/Reducer Coupling and 1-1/2-inch PVC DWV Hub FIPT Female Adapter & Black Steel Pipe, 1-1/2 inch x 2-inch Nipple Fitting.
1.5": Galvanized Iron Piezometer:
Cut pipe to required elevation and cut new threads. Alternatively, weld a 2-inch nipple onto the cut pipe end.
As-Built top elevation
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
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IN
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IN
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LY
ENGINEER: PIEZOMETER DETAILS
WITH WYE FITTING AND BALL VALVE
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
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IN
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IF
N O
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IN
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T, A D
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ES
A C
C O
R D
IN
G
LY
ENGINEERING & ENVIRONMENTAL
SERVICES DIVISION
WASHINGTON SUBURBAN SANITARY COMMISSION
WSSC
DELIVERING THE ESSENTIAL
BD7581A23
AUTOMATED DATA ACQUISITION SYSTEMS OF PIEZOMETERS AT
LITTLE SENECA DAM
BASIN: SENECA CREEK, MONTGOMERY COUNTY, MARYLAND 227NW14
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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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: 2025.06.04 14:19:20 -04'00'
Pinciotti, 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
ENGINEER: SEDIMENT CONTROL DETAILS
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
BD7581A23
AUTOMATED DATA ACQUISITION SYSTEMS OF PIEZOMETERS AT
LITTLE SENECA DAM
BASIN: SENECA CREEK, MONTGOMERY COUNTY, MARYLAND 227NW14
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:
\G
ER
M
AN
TO
W N
-U
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R M
2\ D
C S\
PR
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C
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\W
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.D W
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AM
E:
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
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