lagoon_expansion_addendum_no._4_2026.05.22.pdf

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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

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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:

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PROPOSED

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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

C-202

S-5

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

SEE DETAIL SHEET C-501

EXISTING SPRAY FOR PUMP STATION

IRRIGATION MODIFICATIONS

PUMP STATION

1 C-201

PR. 18" GRAVITY

FROM LAGOON

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

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:

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SITE DETAILS

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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

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

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

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

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