wwtf screening improvements phase ii

WWTF SCREENING IMPROVEMENTS – PHASE II City Project No. 20-01

ADDENDUM NO. 1 TO CONTRACT DOCUMENTS

August 2021

AD-1 N:\Clients\321 City of Winters\18-17-02 Headworks System\ENGR\Screening Improvements Phase II\07_Bid Period Services\Addendum 01\Addendum 01_Summary.docx

ADDENDUM NO. 1 TO

CONTRACT DOCUMENTS FOR

City of Winters WWTF Screening Improvements Phase II (Project No. 20-01) 08/12/21

To: All Plan holders

The following clarifications, changes, additions and/or deletions are hereby made a part of the Contract Documents for the construction of the above referenced project as fully and completely as if the same were fully set forth therein. Acknowledge receipt of this Addendum in the space provided in the Bid Form. Failure to do so may subject the Bidder to disqualification.

This Addendum consists of 10 pages, including the cover page.

ATTACHMENTS No. of Pages

1. Specification Section 05525 – Equipment Shelter 4

2. Revised Drawings S100, S102, and M103 3

3. Bidder Question & Answer Log 1

CHANGES AND ADDITIONS AND/OR DELETIONS TO THE SPECIFICATIONS

1. Various Sections

REPLACE: “The Contractor shall complete all Work required by the Contract Documents within 120 calendar days from the commencement date stated in the Notice to Proceed.”

WITH: “The Contractor shall complete all Work required by the Contract Documents within 250 calendar days from the commencement date stated in the Notice to Proceed.”

2. Article 4, Page 32

DELETE the question titled “Changes Occurring Since Pre-Qualification”.

3. Specification Section 05525 – Equipment Shelter

ADD new specification Section 05525 to the Bid Documents (Attached).

4. Drawings S100, S102, and M103

REPLACE Drawings S100, S102, and M103 dated December 2020 in their entirety with the attached drawings dated August 2021.

End of Addendum No. 1

West Yost – August 2021 05525 - 1 City of Winters

321-18-17-02 Equipment Shelter WWTF Screening Improvements

Phase II

SECTION 05525

EQUIPMENT SHELTER

PART 1 - GENERAL

1.01 SECTION INCLUDES

A. Furnishing material, supplies, equipment, tools, transportation and facilities and

performing labor and services necessary for, required in connection with or

properly incidental to furnishing and installing equipment shelter, as described in

this section of the specifications, shown on the accompanying Drawings, or

reasonably implied therefrom.

1.02 REFERENCED SECTIONS

A. The following Sections are referenced in this Section

1. Section 01330 – Submittals

2. Section 05501 – Anchor Bolts and Anchoring Devices

1.03 DESIGN

A. 9'x14' prefabricated all-steel equipment shelter in knock-down form, ready for

contractor assembly.

1. Height: minimum 7’-6” at eave.

B. Minimum framing requirements: 2”x3” welded tube steel w/ min 0.083” wall,

coated or hot-dip galvanized to resist corrosion.

1. Provide minimum 20 year warranty on framing coating or galvanizing.

C. Roof: minimum 26 gauge sheet steel, coated to resist corrosion and effects of

weather and UV exposure.

1. Provide minimum 30-year warranty on sheet steel.

D. Conform to Chapter 22, California Building Code; 2019 Edition (CBC).

E. Live Load: 20 psf

F. Wind Load: Exposure C, 115 mph, I = 1.0

G. Owner to select color from manufacturer's standard color submittals.

1.04 SUBMITTALS

A. Comply with Section 01330.

B. Provide certified drawings and calculations, stamped and signed by a California-

registered Civil or Structural Engineer for the building including the anchor bolts and

their embedment in the concrete. Indicate compliance with CBC and other codes as

applicable and indicate design parameters used for wind and seismic loading.



Phase II

C. Layout and installation drawings including anchor bolt locations.

PART 2 - PRODUCTS

2.01 MANUFACTURER

A. PWS, Inc., San Luis Obispo, CA: Standard steel equipment shelter

B. Or approved equal.

2.02 MATERIALS

A. Structural Steel Shapes and Plates: ASTM A36.

B. Structural Tubing: ASTM A500, Grade B.

C. Sheeting: R-Panel, Grade E, 60 ksi.

D. Stainless Steel: ASTM A320, Type 304, or Type 316 as specified

E. Bolts, Nuts, and Washers: Minimum Type 304 stainless steel.

2.03 FABRICATION

A. Fabricate structural steel members in accordance with AISC Specifications.

B. Holes for bolts or rivets shall be punched or drilled 1/16-inch larger than normal

bolt.

C. Zinc coating: As specified in ASTM A153.

2.04 ANCHOR BOLTS

A. Provide anchor bolts meeting the requirements of Section 05501.

PART 3 - EXECUTION

3.01 STEEL ERECTION

A. Erect structural steel in accordance with AISC Specification.

B. Assemble and install per manufacturer’s instructions.

C. Make provision for erection loads, and for sufficient temporary bracing to maintain

structure safe, plumb and in true alignment until completion of erection and

installation of permanent bracing.

D. Do not field cut or alter structural members without approval of Engineer.

E. Bolting: Securely bolt or weld the work as erection progresses to provide for all

dead load, lateral forces and erection stresses.

3.02 REPAIR OF DEFECTIVE GALVANIZED COATING

A. Where zinc coating has been damaged after installation, substrate surface shall be

first cleaned and then repaired with zinc dust-zinc oxide coating in accordance with

ASTM A780. Application shall be as recommended by the zinc dust-zinc oxide



Phase II

coating manufacturer. Coating shall consist of multiple coats to dry film thickness

of eight mils.

B. Remove items not physically damaged, but which have insufficient or deteriorating

zinc coatings, and items damaged in shipment or prior to installation from the

project site for repair by the hot-dip zinc coating method.

3.03 CLEANING

A. After installation, damaged surfaces of shop primed metals shall be cleaned and

touched up with the same material used for the shop coat.

END OF SECTION



Phase II

(THIS PAGE LEFT BLANK INTENTIONALLY)

PMP121

FLT122

M

FLT122

PNL122

WASH WATER SYSTEM

PLAN & SECTION

M103

CITY OF WINTERS

WWTF SCREENING IMPROVEMENTS PHASE II

2

1

A B C

5

4

3

D E GF H

8

7

6

9

10

A B C D E GF H

I J K L M N O P

1

2

3

4

5

I J K L M

6

7

8

N O P

9

10

SECTION

DETAIL

FLT122

PNL122

PMP121

SECTION

RFI #Prepared

ByDate

EmailedSpecSection

Plan, Sheet,Detail Response

1 PVT 8/5/2021 M103Specification is provided in Addendum No. 1.

2 PVT 8/5/2021 00 52 13

West Yost recommends setting the Time for Completion at 36 weeks. Owner will make a final determination and issue revised Div 00 specs as needed.

3 PVT 8/6/2021 S100, M103 Shelter shall be 9' x 14'. Concrete pad shall be 10' x 15'. See revised drawings in Addendum 1.

4 PVT 8/6/2021 M103The pressure relief valve shall be a 1-inch valve and 1" x 2" reducers shall be installed upstream on downstream of the valve to connect it to the 2-inch piping. See revised drawings in Addendum 1.

5 PVT 8/6/2021 M103

Motorized valve shall be provided by grinding & screening equipment manufacturer. Specifications for motorized valve are in Section 11331-2.07.B.1. This specification section is referenced on the revised drawing M103 in Addendum 1.

6 PVT 8/6/2021 S102, M101Posts shall be 3" Sch 40 SST. See revised drawings in Addendum 1.

7 PVT 8/11/2021 00 41 43There was no contrator pre-qualification for this Project. This question shall be deleted from the Bid Form.

8 PVT 8/11/2021 09960 M102 Yes, the existing coating should be removed in areas where the new grout and rebar dowels will be installed prior to installation of the new grout and dowels.Yes, the new concrete grout sahll be coating with Coating System No. 30 specified in Section 09960

In Article 4 of the BID FORMS (Page 32), there is a question titled "Changes Occuring Since Prequalification". Was there a contractor prequalification required for this project? If not, please remove this question from the bid forms.

The Plan View on Dwg. M102 states the "(E) Channels have an H2S Resistant Coating on them" . Does the existingcoating need to be removed prior to installation of the new rebar dowels and corner grout? In addition, it appears the intent is to coat the new concrete corner grout with Painting System No. 30 (Spec. Section 09960). Please review and confirm.

Section A on Dwg. S102 indicates 1.75" OD Aluminum posts with safety chains. Detail 1 on Dwg M101 indicates these posts are 3" Sch 40 SST. Please confirm which is correct.

Question

Section J on Drawing M103 references Specification Section 05525 for the 8' x 14' Equipment Shelter. This specification is missing from the bid documents. Please provide a specification for the shelter.The Time for Completion listed in the Contract (Section 00 52 13) is 120 Calendar Days (Approx. 17 weeks). This does not appear to be adequate time for completion of the project due to the time required for the following:1. Contractor issuance and negotiation of Equipment PO's & Electrical Subcontract.2. Major Equipment and Control Panel CP-1 Submittal preparation time.3. Submittal review and approval time.4. Equipment and Control Panel Procurement after submittal approval5. Equipment Installation, Startup and TestingHas the City confirmed the submittal preparation and equipment procurement lead times with the manufacturers of the Grinding Screening System (11331), Rotary Lobe Pumps (11395), Automatic Self Cleaning Filters (11402), and Control Panel CP-1 (16010)? It appears that an additional 14-20 weeks may be required to complete the project.

Drawing S100 indicates the Concrete Slab for the Water Pump and Automatic Filter measures7'-6" x 15'. Section J on Drawing M103 indicates the Shelter that sits on this slab measures 8' x 14'. Please review and confirm the required length and width of the concrete slab.Section G on Dwg. M103 details a 2" Pressure Relief Valve. Note 2 Calls out a ClaVal 55B-60 or Equal pressure relief valve. Based on ClaVal's literature, the 55B-60 valve is only available in 1/2", 3/4" and 1" sizes. Is the intent to reduce to 1" on each side of the PRV, or is there another valve desired?

Please provide a specification for the motor actuated 2" Ball Valve shown in the plan view on drawing M103 (Labeled "MOV~21" on Dwg I100). We are unable to find an actuator specification in the bid documents.

Pre-Bid Requests For InformationCity of Winters WWTF Influent Screening Improvements, Ph 2