City of Palmer - MBBR Phase I Procurement-Addendum #1

ADDENDUM # 1

Date: November 18, 2016 To: All Bid Document Holders

City of Palmer - MBBR Phase I Procurement-MBBR System PROJECT NUMBER 16-06PW

The following changes, additions, and/or deletions are hereby made a part of the Request for Bid as fully and completely as if same were fully set forth herein:

BIDDING REQUIREMENTS A. Page 1 of 1, INVITATION TO BID; Second Paragraph replace this paragraph with the following

paragraph:

Sealed bids clearly marked with project name and submitting company, in single copy, for furnishing all labor, equipment, and materials and performing al work for the above project are hereby invited. Bids will be opened publicly and read aloud at Palmer City Hall, 231 W Evergreen Avenue, Palmer, Alaska on December 6, 2016 at 2:00 PM.

SPECIFICATIONS

A. SPECIFICATION SECTION 46 53 59 MOVING BED BIOREACTOR (MBBR) SYSTEM PROCUREMENT: REPLACE PARAGRAPH 1.4.E WITH THE FOLLOWING:

1.4.E. City of Palmer Design Influent Characteristics are as shown in the table below.

Parameter Units Startup (Phase 1) Phase 21

Flow, Max Month Design MGD 0.65 1.2

Flow, Peak Hourly MGD 0.98 1.83

BOD5, Design Lb/day 1,529

2,822

TSS, Design Lb/day 1,654 3,054

City of Palmer - MBBR Phase I Procurement-Addendum #1

TKN, Design Lb/day 260 479

NH3-N, Design Lb/day 174 321

Elevation ft 150 150

Min/Max Temperature °C 5 /16 5 / 16 1 Carrier media will only be supplied for Phase 1 conditions. The Seller shall provide

a full design for both Phase 1 and Phase 2 conditions; however, carrier media for Phase 2 shall not be included in the Bid Proposal at this time.

B. SPECIFICATION SECTION 46 53 59 MOVING BED BIOREACTOR (MBBR) SYSTEM

PROCUREMENT: REPLACE 1.4.L. WITH THE FOLLOWING PART 1.4.L:

1.4. L The MBBR System configuration and equipment shall follow the dimensions and requirements of the following table:

Parameter Units Phase 1 Phase 2 (future)

Flow mgd 0.65 1.2

Process Trains - 2 2

Aerobic Carbon Removal Reactors per Train - 1 1

Aerobic Nitrification Reactors per Train - 2 2

C-Stage Reactors

Dimensions (Each) ft 34 L x 30 W x 20

SWD

34 L x 30 W x 20

SWD

Volume (Each) ft3 20,400 20,400

Volume (Total) ft3 40,800 40,800

Fill of Biofilm Carriers % 27 (Min Fill) 65 (Max Fill)

Nitrification Reactors

Dimensions (Each) ft 18 L x30 W x 20

SWD

18 L x 30 W x 20

SWD

Volume (Each) ft3 10,800 10,800

Volume (Total) ft3 43,200 43,200

Fill of Biofilm Carriers % 27 (Min Fill) 65 (Max Fill)

Aeration System Type - Medium Bubble Medium Bubble

Min. Anticipated Residual DO, Max. Month mg/L 4 - 5 4 - 5

Minimum Total Media Volume ft3 22,598 41,807

Minimum Media Protected Surface Area M2/M

3 500 500

Total Process Air Requirement (All Trains) SCFM 980 1,705

Total Mixing Air Requirement (All Trains) SCFM 3,060 3,060

Discharge Pressure (Top of Drop Pipe) psi ~ 8.55 ~8.55

Freeboard ft 2-3 2-3

City of Palmer - MBBR Phase I Procurement-Addendum #1

C. SPECIFICATION SECTION 46 53 59 MOVING BED BIOREACTOR (MBBR) SYSTEM PROCUREMENT: REPLACE 2.4.A.2 WITH THE FOLLOWING PART 2.4.A.2:

2.4.A.2: “The maximum carrier media fill percentage shall be 65% of the MBBR Cell.”

D. SPECIFICATION SECTION 46 53 59 MOVING BED BIOREACTOR (MBBR) SYSTEM PROCUREMENT: REPLACE 2.4.B.5 WITH THE FOLLOWING PART 2.4.B.5:

2.4.B.5: “The maximum carrier media fill percentage for Phase 2 cannot exceed 65% of the MBBR Tank Volumes.”

E. SPECIFICATION SECTION 46 53 59 MOVING BED BIOREACTOR (MBBR) SYSTEM PROCUREMENT: REPLACE 2.5.C.2.C WITH THE FOLLOWING PART 2.5.C.2.C:

2.5.C.2.C: “Fine bubble type diffusers shall not be acceptable.”

F. SPECIFICATION SECTION 46 53 59 MOVING BED BIOREACTOR (MBBR) SYSTEM PROCUREMENT: ADD A PARAGRAPH FOLLOWING PARAGRAPH 2.7.E:

2.7.F: Wedgewire Media Retention Screens meeting the performance requirements stated in Part 2.7 shall be acceptable.

G. SPECIFICATION SECTION 46 53 59 MOVING BED BIOREACTOR (MBBR) SYSTEM PROCUREMENT: REPLACE PARAGRAPH 2.8.A.1 AND 2.8.A.2 with the following paragraph 2.8.A.

2.8 ANCHORS

A. General

1. The Seller shall furnish all anchoring hardware for the supplied equipment unless otherwise noted in the Scope of Supply; Hilti H-150 MAX SD adhesive or similar epoxy anchor product, or approved equal.

DRAWINGS

B. Replace the following Drawings with the attached revised drawings:

Drawing 200D101

Drawing 200D301

Drawing 200D302

Drawing 800Y604

Drawing 800Y605

Signed by the Project Manager_____ ___ Dated 11/18/2016