lagoon_expansion_addendum_no._4_2026.05.22.pdf

Exactly as extracted, unformatted — for checking against the original. The readable version is easier to read.

Ring W. Lardner, P.E.
W. Zachary Crouch, P.E.
ADDENDUM NO. 4 Michael E. Wheedleton, AIA, LEED GA
Jason P. Loar, P.E.
Jamie L. Sechler, P.E.
LAGOON EXPANSION PROJECT
TOWN OF CENTREVILLE
QUEEN ANNE’S COUNTY, MARYLAND
DBF #4068A002
May 22, 2026
The following revisions are hereby made part of the Contract Documents. Unaltered provisions of the
Bidding Documents shall remain in effect. Unless specified otherwise, material and work required by this
Addendum shall conform to the requirements of the original Bidding Documents.
Failure to acknowledge receipt of this Addendum on the Bid Form may subject the bidder to
disqualification.
This Addendum (1 page) and the attachments (2 plan sheets) totals 3 pages.
GENERAL
1. The bid date has not changed from Addendum No. 3 and is still May 29, 2026, 10:00 AM,
Town Hall, 101 Lawyer’s Road, Centreville, Maryland 21617.
2. General contractors are responsible to properly protect and support existing utilities, including
but not limited to electrical conduit, solar electrical conduit, well and water line, as required
and as shown within the contract documents which include the plan sheets and previously
provided Lagoon As-Built Plans (Addendum No. 1). This work shall be included as part of the
general contractor’s bid.
PLANS
1. Sheet C-101: Updated alignment of proposed 18-inch gravity line from proposed lagoon to
existing wet well and updated proposed alignment of 10-inch force main from existing 10-inch
force main connection to proposed lagoon.
2. Sheet C-501: Updated location and orientation of proposed 18-inch gravity line and valve
related to the connection with the existing wet well; alignment and elevation.
END OF ADDENDUM NO. 4
\\CORP.DBFI NC.COM\SHARED-SBY\MUNICIPAL\4068A CENTREVILLE\4068A002 - LAGOON EXPANSION\ADMIN\BID-AWARD\ADDENDA\ADDENDUM NO. 4\ADDENDUM
NO. 4.DOCX
 601 E. MAIN STREET, SUITE 100, SALISBURY, MD 21804 • 410-543-9091
 1 PARK AVENUE, MILFORD, DE 19963 • 302-424-1441
 106 N. WASHINGTON STREET, SUITE 103, EASTON, MD 21601• 410-770-4744
 207 E. WATER STREET, SUITE 100, CENTREVILLE, MD 21617 • 443.262.9130
www.dbfinc.com

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Professional Certification. I hereby certify that
these documents were prepared or approved by
me, and that I am a duly licensed Professional
in the laws of the State of
License No. Expiration Date:
N
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THIS DRAWING, THE DESIGN AND CONSTRUCTION FEATURES DISCLOSED ARE PROPRIETARY TO DAVIS, BOWEN & FRIEDEL, INC., AND SHALL NOT BE ALTERED OR REUSED WITHOUT WRITTEN PERMISSION. COPYRIGHT©
NOISNAPXE
NOOGAL
ELLIVERTNEC
ELLIVERTNEC
FO
NWOT
DNALYRAM
,YTNUOC
S'ENNA
NEEUQ
JANUARY 2026
1" = 50'
JML
4068A002.001
PROPOSED
SITE PLAN
C-101
STNEMMOC
ETAD
4
.ON
MUDNEDDA
62/22/5
1
LEGEND
EX. GRAVEL ROAD
PR. GRAVEL ROAD S-3
25WLB 25' WETLAND BUFFER
LAT:39.05051
WETLANDS
Engineer Maryland,
31100 01-21-2027 100SB 100' STREAM BUFFER LON:76.02715
S-4
LAT:39.05032
LON:76.02601
3
C-202
S-5
3
C-202 LAT:39.04974
S-2
LON:76.02559
LAT:39.04976
EX. 10" DIP FORCEMAIN 2
AWAY FROM LAGOON LON:76.02753
C-201
2
C-201
SEE DETAIL SHEET C-501
EXISTING SPRAY FOR PUMP STATION
IRRIGATION MODIFICATIONS
PUMP STATION
1
1 C-201
PR. 18" GRAVITY
FROM LAGOON
1
C-201
EX. ELECTRIC
BOX
S-6
PROPOSED PIPE DISCHARGE
CONCRETE PAD, SEE DETAIL EX. 10" D.I.P.
SHEET C-501 FORCEMAIN PROPOSED AIR BACKWASH
TOWARD PR. 10" TEE W/ 2 GATE CONNECTION POINT, SEE LAT:39.04875
VALVES
EXISTING LAGOON DETAIL SHEET C-501
PR. 10" D.I.P. FORCEMAIN
TOWARD PR. LAGOON S-1 LON:76.02558
LAT:39.04872
LON:76.02762
EXISTING
WELL
1
PROPOSED 10"
GATE VALVE W/ 2 45° BENDS
PROPOSED 18"
GRAVITY SEWER
PROPOSED 10" DIP FM PROPOSED 10" DIP
AWAY FROM LAGOON FORCEMAIN TOWARD
EXISTING SPRAY
FOR FUTURE USE PROPOSED LAGOON
IRRIGATION PUMP STATION
EX. 10" DIP FORCEMAIN EXISTING OPERATIONS
TOWARD EXISTING LAGOON BUILDING
EX. 12" DIP FORCEMAIN EX. 10" DIP FORCEMAIN AWAY
AWAY FROM EXISTING FROM EXISTING LAGOON
LAGOON
EX. 14" DIP FORCEMAIN AWAY
FROM EXISTING LAGOON
EX. 8" DIP FORCEMAIN AWAY
FROM EXISTING LAGOON
2026

Date:
Scale:
Dwn.By:
Proj.No.:
Dwg.No.:
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Professional Certification. I hereby certify that
these documents were prepared or approved by
me, and that I am a duly licensed Professional
in the laws of the State of
License No. Expiration Date:
N
M
L
K
J
I
H
G
F
E
D
C
B
A
THIS DRAWING, THE DESIGN AND CONSTRUCTION FEATURES DISCLOSED ARE PROPRIETARY TO DAVIS, BOWEN & FRIEDEL, INC., AND SHALL NOT BE ALTERED OR REUSED WITHOUT WRITTEN PERMISSION. COPYRIGHT©
NOISNAPXE
NOOGAL
ELLIVERTNEC
ELLIVERTNEC
FO
NWOT
DNALYRAM
,YTNUOC
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JANUARY 2026
AS SHOWN
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4068A002.001
SITE DETAILS
C-501
STNEMMOC
ETAD
4
.ON
MUDNEDDA
62/22/5
1
8" MIN.LAP
PERIMETER ROAD - SEE
DETAIL THIS DWG. (SEE
SITE PLAN FOR LOCATION)
18" 2'-0"
4" MIN. SEAM FLUSH
WITH UPPER LAP
Engineer Maryland,
12" THICK R-4 31100 01-21-2027
RIP-RAP
TYPICAL FIELD SEAM DETAIL
ANCHOR TRENCH
PER MANUFACTURES EXTEND R-4 RIP-RAP 2'-0" NOT TO SCALE
RECOMMENDATIONS, FROM INSIDE TOE OF SLOPE
SEE DETAIL THIS
SHEET
12" COMPACTED SOIL COVER
0.5% SLOPE
SUBBASE PREPARED
W/ SMOOTH ROLLER
COMPACTOR
GEOSYNTHETIC CLAY
LINER (GCL) SYSTEM
NON-WOVEN GEOTEXTILE;
2% CROSS SLOPE TENSAR INTERAX NX650
GEOGRID, OR APPROVED EQUAL
12" CRUSHER RUN
APPROVED SUBGRADE
TO 95% MODIFIED
PROCTOR
GRAVEL DRIVE DETAIL
NOT TO SCALE
ROUNDED CORNER
COMPACTED SOIL BACKFILL
18" 2'-0"
2026
"42
25'-0"Ø
12" THICK R-4 RIP-RAP
18" DIA., 3/8" HIGH CAPACITY "T" SCREEN
W/ HEAVY DUTY S.S. WIRE AND MIN. 75%
OPEN AREA, JOHNSON SCREENS
MAX-FLOW OR EQUAL.
LINER PENETRATIONS
PER MANUFACTURERS
RECOMMENDATIONS
TOP LINE EL. 48.5'
℄ EL. 50.5'
12" COMPACTED ELEV. 49.5' LOW WATER EL. TOP CONC. EL. 47.5'
SOIL COVER GEOSYNTHETIC CLAY
LINER (GCL) SYSTEM
0.5% SLOPE
12" COMPACTED
SOIL COVER
10 OZ. GEOTEXTILE UNDER RIP-RAP
18"x12" DIP M.J. REDUCER
18" DIP M.J. 90° EL.
18" PVC C900 PIPE
INVERT EL. 42.81'
BOTTOM CONC. EL. 41.5' ANCHORAGE TRENCH DETAIL
2" SCH-40 S.S. PIPE FOR AIR 5'-0"Ø
NOT TO SCALE
BACKWASH. PLACE 6" FROM18" PVC
AT SAME HORIZONTAL CENTERLINE
LAGOON CONNECTION PIPE
NOT TO SCALE
8"
1
SEIRAV
EXISTING 10" DIP
FORCEMAIN FROM WWTP
EXISTING VERTICAL TURBINE
PUMPS (TYP. OF 2)
EXISTING ACCESS HATCH
18" FLANGED GATE
VALVE WITH VALVE
STEM EXTENSION
AND FLOOR BOX
CORE DRILL & LINK SEAL
PR. 18" D.I.P. FORCEMAIN
FROM PR. LAGOON WITH
18" FLANGED GATE
VALVE AND WALL PIPE;
INV. EL: 44.00
EXISTING PIPE
TO/FROM LAGOON
CONNECTION DETAIL
1
NOT TO SCALE
EXISTING ACCESS HATCH
PROPOSED VALVE STEM
GUIDE AS RECOMMENDED
BY THE MANUFACTURER.
20 YEAR
SILICONE CAULK
STAINLESS STEEL CLAMP
45 MIL ADHESIVE CAP
STRIP (CONTINUOUS)
2" WIDE LINER MATERIAL
BETWEEN CLAMP AND BOOT
2" x 1/4" S.S. BATTEN ADHESIVE
PIPE BOOT
45 MIL PLY IN
SPLASH AREA ONLY
PIPE BOOT
PROPOSED 18" GATE VALVE
AND STEM EXTENSION.
INV. ELEV. 44.00
BUTYL TAPE
1'-0" OR AS NOTED 1/2"Ø POLYPROPYLENE 4" N.
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EXISTING PIPE TO/FROM LAGOON
INV. ELEV. 41.00
2' MIN. 6'-0" BUTYL TAPE
CONNECTION DETAIL
1
NOT TO SCALE
INVERT 65.00
ADD EXTRA PLY OF 45 MIL LINER
3* 2" COMPRESSOR
MATERIAL IN SPLASH AREA TO
1 QUICK DISCONNECT STANDARD COVER ALL DOWN GRADE CONCRETE
FITTING, TYP. OF 2 METER BOX
10" DUCTILE IRON PIPE
6"
2" SS BALL VALVE, TYP. OF 2
5' WIDE CONCRETE PAD, REINFORCED
WITH #4 REBAR @ 12" 0.C.E.W. EXTEND
PAD BEYOND PIPE BOOT AS SHOWN
6"
TURN DOWN (3)
SIDES, TYP.
2" SS SCH-40 AIR PIPE
PIPE DISCHARGE CONCRETE PAD
NOT TO SCALE TO EXISTING LAGOON TO PROPOSED LAGOON
AIR BACKWASH CONNECTION POINT DETAIL
NOT TO SCALE