IFB#259 Addendum#1 Attach A

965 KB Posted Jul 14, 2022

Attached to: Northside WWTP Aeration Basin Improvements
Solicitation number: 2022-IFB-259
Issued by: Douglas County, Georgia

About this file

Written by GovTribe AI · Jul 23, 2026

This is Addendum #1 to the bid drawings for IFB #259, issued by the Douglasville-Douglas County Water and Sewer Authority for the Northside WWTP Aeration Basin Improvements project in Douglasville, Georgia. The addendum, dated July 2022, provides detailed civil construction drawings and specifications for the project, which includes installation of aeration equipment in two oxidation ditches, conversion of mixer mounting systems, construction of concrete walkways and canopy structures, installation of RAS weir gates with guardrails and stairs, and associated electrical and site work. The drawings show the overall site plan layout of the wastewater treatment plant facilities, including existing structures such as grit chambers, waste sludge holding tanks, bar screens, clarifiers, chlorine contact chamber, control building, pump station, sludge drying beds, and blower systems. Key construction details include a temporary sediment trap with block and gravel filtration (detail Sd2-BG), concrete walkway specifications with isolation and contraction joint details (detail C-32-0561), installation of six-inch Schedule 40 PVC pipe with minimum three feet of cover, and a four-inch thick concrete walkway. The contractor is required to verify existing conditions in the field prior to construction, coordinate temporary laydown locations with the Authority, restore disturbed areas totaling 0.10 acres through permanent seeding, and comply with Georgia's Manual for Erosion and Sediment Control.

The drawings establish construction standards and technical specifications prepared by Hazen and Sawyer, with the project engineer identified as V. Nguyen and design work by A. Bowling, S. Kim, and B. Jones. Concrete joint details include Type A through Type D configurations for transverse and longitudinal construction joints, with specifications for tie bar placement, spacing, and vertical tolerance. All work will be performed within Authority easements and public right of way, with all necessary federal, state, and local permits previously obtained. The project is characterized as a turnkey effort requiring minimal involvement of Authority personnel, with the contractor responsible for providing all labor, materials, equipment, tools, transportation, and supplies necessary for completion.

Text of this file

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SD SD SD

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SD SD SD SD SD SD

SD SD SD SD SD SD SD

W W

W W W W W W W W W W W

SS SS SS SS SS SS SS

W W

WWWW

W W

W W W

GRIT CHAMBER

WASTE

SLUDGE

HOLDING

TANK

BAR SCREEN

STRUCTURE

100 - NO.2 OXIDATION DITCH

100 - NO.1 OXIDATION DITCH

FINAL

CLARIFIER

NO. 2

FINAL

CLARIFIER

NO.1

CHAMBER CHLORINE

CONTACT

CONTROL

BUILDING

PLANT

PUMP

STATION

SLUDGE

DRYING

BEDS

200 - RAS

COLLECTION

BOX

BLOWER

LODLODLODLODLOD

LOD

LOD LOD LOD LOD LOD LOD

T D

B Y:

Fi le

: O :\3

-A

-0

Sa ve d by B

S av e da te

: 7 /2

BID DRAWING

NORTHSIDE WWTP

IMPROVEMENTS

DOUGLASVILLE-DOUGLAS COUNTY WATER

AND SEWER AUTHORITY

DOUGLASVILLE,GEORGIA

31247-021

MAY 2022V. NGUYEN

IF THIS BAR DOES NOT

MEASURE 1" THEN DRAWING

IS NOT TO FULL SCALE

CHECKED BY:

DRAWN BY:

PROJECT

ENGINEER:

REV ISSUED FOR DATE BY

0 1"1/2"

CONTRACT NO.:

HAZEN NO.:

DATE:

DRAWING

NUMBER:HAZEN AND SAWYER

1300 ALTMORE AVENUE

SUITE 520

ATLANTA, GEORGIA 30342

1 BID SET 05/2022 VLN

0 20'10

SCALE: 1" = 20

NOTES:

1. EXISTING CONDITIONS SHOWN ARE BASED ON THE BEST

AVAILABLE INFORMATION AVAILABLE TO THE ENGINEER,

INCLUDING RECORD DRAWINGS. THE CONTRACTOR

SHALL VERIFY THE LOCATIONS AND ELEVATIONS OF ALL

ABOVE GROUND STRUCTURES, YARD PIPING, AND DUCT

BANKS IN THE FIELD PRIOR TO THE START OF ANY

CONSTRUCTION ACTIVITIES.

2. RESTORE ANY LAND DISTURBANCE CAUSED BY

EXCAVATION FOR UNDERGROUND PIPING INSTALLATION

AND OPERATION WITH PERMANENT SEEDING PER THE

GRASSING SCHEDULE ON CD001 AND THE MANUAL FOR

EROSION AND SEDIMENT CONTROL IN GEORGIA.

3. DISTURBED AREA = 0.10 ACRES

4. CONTRACTOR TO COORDINATE WITH DDCWSA ON

TEMPORARY LAYDOWN LOCATION PRIOR TO THE START

OF ANY CONSTRUCTION ACTIVITIES.

5. EXTEND 6-INCH SCHEDULE 40 PVC PIPE 2-FEET BEYOND

EDGE OF EXISTING PAVEMENT. SIX INCH PVC SHALL

HAVE MINIMUM 3-FEET OF COVER.

6. INSTALL 4-INCH THICK CONCRETE WALKWAY WHERE

SHOWN. SEE DETAIL C-32-0561 FOR ISOLATION AND

CONTRACTION JOINT DETAILS.

B. JONES

S. KIM

A. BOWLING

C010

NORTHSIDE WWTP

CIVIL

OVERALL SITE PLAN

CONCRETE PAD

AND CANOPY

SEE DRAWING M102

TEMPORARY

SEDIMENT TRAP

ON EXISTING INLET

Sd2-Bg

LIMIT OF

DISTURBANCE

AERATION BASIN

SEE DRAWING M101

FREE BORE INSTALLATION OF

6" SCH 40 PVC, SEE NOTE 5

6-INCH PVC CASING PIPE

CONCRETE WALKWAY

SEE NOTE 6 AND SEE

INSET A

ISOLATION JOINT AT EXISTING

CONCRETE WALKWAY OR

STRUCTURE, TYP

CONTRACTION

JOINT, TYP

SCALE: 1"=5'

INSET A

CANOPY PAD

2 ADDENDUM #1 07/2022 VLN

T D

B Y:

Fi le

: O :\3

-A

-0

\C D

Sa ve d by

R D

S av e da te

: 4 /4

BID DRAWING

NORTHSIDE WWTP

IMPROVEMENTS

DOUGLASVILLE-DOUGLAS COUNTY WATER

AND SEWER AUTHORITY

DOUGLASVILLE,GEORGIA

31247-021

MAY 2022V. NGUYEN

IF THIS BAR DOES NOT

MEASURE 1" THEN DRAWING

IS NOT TO FULL SCALE

CHECKED BY:

DRAWN BY:

PROJECT

ENGINEER:

REV ISSUED FOR DATE BY

0 1"1/2"

CONTRACT NO.:

HAZEN NO.:

DATE:

DRAWING

NUMBER:HAZEN AND SAWYER

1300 ALTMORE AVENUE

SUITE 520

ATLANTA, GEORGIA 30342

1 BID SET 05/2022 VLN

B. JONES

S. KIM

A. BOWLING

CD001

NORTHSIDE WWTP

CIVIL

CONSTRUCTION DETAILS

Ds3 - PERMANENT COVER

1' MIN. 2' MAX.

NOTE:

1. HARDWARE CLOTH OR COMPARABLE WIRE MESH WITH 12 INCH OPENINGS SHALL BE FITTED OVER ALL

BLOCK OPENINGS TO HOLD GRAVEL IN PLACE.

2. THE FOUNDATION SHOULD BE EXCAVATED AT LEAST 2 INCHES BELOW THE CREST OF THE STORM

DRAIN. THE FIRST ROW OF BLOCKS WILL BE PLACED HERE FOR LATERAL SUPPORT.

3. ONE BLOCK (AS SHOWN) IS TO BE PLACED ON EACH SIDE OF THE STRUCTURE ON ITS SIDE IN THE

BOTTOM ROW TO ALLOW FOR POOL DRAINAGE.

FOUNDATION SET 2" BELOW

CREST OF STORM DRAIN

DROP INLET

W/ GRATE

TEMPORARY

SEDIMENT POOL

GRAVEL

DEWATERING

RUNOFF WATER

WITH SEDIMENT

WIRE SCREEN

BLOCK AND GRAVEL SECTION

WIRE SCREEN

DROP INLET GRATE

GRAVEL FILTER SHOULD

HAVE SLOPE OF 2:1

CONCRETE

DEWATERING

BLOCK AND GRAVEL PERSPECTIVE

Sd2-BG INLET SEDIMENT TRAP

BLOCK AND GRAVEL

BLOCK

LONGITUDINAL CONTRACTION JOINT

#4 (30" LONG)

TIE BAR AT

2'-6" CENTERS

TRANSVERSE CONTRACTION JOINT

NOTES:

L/2 L/2

C-32-0561

S-03-0201 S-03-0201

TYPE A

TYPE B

L/2 L/2

S-03-0202

INTERIM OR PLANNED TRANSVERSE

OR LONGITUDINAL CONSTRUCTION

JOINT

TYPE C

A TRANSVERSE AND LONGITUDINAL

CONSTRUCTION JOINTS, TYPE C, SHALL BE

CONSTRUCTED AT THE END OF EACH DAYS

OPERATIONS (PLANNED JOINT) OR WHENEVER

THE PLACING OF CONCRETE IS SUSPENDED

FOR MORE THAN 30 MINUTES (INTERIM JOINT).

AN APPROVED HEADER SHALL BE USED AT

INTERIM JOINTS AND SHALL BE DESIGNED TO

PERMIT THE PLACEMENT OF TIE BARS AND

SHALL HOLD SUCH BARS IN THEIR CORRECT

LOCATIONS.

B PLANNED TRANSVERSE AND LONGITUDINAL

CONSTRUCTION JOINTS SHALL BE LOCATED AT

THE SAME SPACING REQUIRED FOR

CONTRACTION JOINTS. REFER TO JOINT

LAYOUT PLANS.

C VERTICAL TOLERANCE FOR PLACEMENT OF

DOWELS OR TIE BARS SHALL BE 1/4".

D JOINT TREATMENT AS INDICATED BY DETAIL

S-03-0202 IS NOT REQUIRED FOR INTERIM

JOINTS.

S-03-0201

EXPANSION (ISOLATION) JOINT

TYPE D

#4 (30" LONG)

TIE BAR AT 12"

CENTERS

CONCRETE

PAVEMENT

STONE BASE

3/4" ±1/4"

SUBGRADE

OR SUBBASE

ABUTTING SLAB

/STRUCTURE/CURB

OR SIDEWALK

PREMOLDED RESILIENT

JOINT FILLER

CONCRETE PAVEMENT CONTROL

JOINTS

2 ADDENDUM #1 07/2022 VLN

Sheets and Views

C010

CD001-ADD1

CD001

Other files

File	Type	Posted
IFB#259 Ad. Northside WWTP	—	Jul 14, 2022
IFB#259 Addendum #2	—	Jul 14, 2022
Award Information	—	Jul 14, 2022
IFB#259 Addendum #1	—	Jul 14, 2022
IFB#259 Addendum#1 Attach B	—	Jul 14, 2022

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File details come from the government source that posted it. Updated Jul 23, 2026.