CITY AND COUNTY OF SAN FRANCISCO PUBLIC UTILITIES COMMISSION WASTEWATER ENTERPRISE

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1 San Francisco Water Power Sewer SOUTHEAST WATER POLLUTION CONTROL PLANT BUILDINGS 040, 041, 044, 060, 061, 062, 925, AND 960 MECHANICAL IMPROVEMENTS CONTRACT NO. WW-654 ADDENDUM NO. 3 Signatures: 9i;,.,,:.._\ I' Kent Minh, \\J e> Project Engineer Daniel Alvarado, Project Manager j? / Derek Wong, Contract Analyst Date: January 15, 2019 Fine, DEPUTY AGM M ADMINISTRATION BUREAU NOTICE TO PARTIES HOLDING SPECIFICATIONS AND CONTRACT PROPOSAL: The Contract Documents of the contract named above are hereby amended as follows: LOCATION Soecifications Section , ADVERTISEMENT FOR BIDS CHANGE Paragraph 1 REMOVE: Sealed bids will be received at 525 Golden Gate Avenue, 3 rd Floor- Tuolumne Room, San Francisco, CA 94102, until 2:00 P.M. on 01/17/2019 REPLACE: Sealed bids will be received at 525 Golden Gate A venue, 3 rd Floor - Tuolumne Room, San Francisco, CA 94102, until 2:00 P.M. on 01/24/2019 End of Addendum No. 3 Pagel of I

2 San Francisco Water Power Sewer Sonfcm of Um Si Franomso Public UOlotins cortonnion Signatures: SOUTHEAST WATER POLLUTION CONTROL PLANT BUILDINGS 040, 041, 044, 060, 061, 062, 925, AND 960 MECHANICAL IMPROVEMENTS CONTRACT NO. WW-654 ADDENDUM NO. 2 c- Kent NI imiw-pe -t) ANcir&J Project Engineer Daniel Alvarado, PE Project Manager Jo ph Buitra, PE C ntract Standards Engineer Date: January 11, 2019 Signature: Joseph Wong, Manager NOTICE TO PARTIES HOLDING SPECIFICATIONS AND CONTRACT PROPOSAL: The Contract Documents are hereby amended as follows: LOCATION S ecifications Section LIST OF DRAWING SHEETS Section SUMMARY OF WORK CHANGE DELETE Section in its entirety and REPLACE with (REV 1) Section , page 6, Article Design Services Provided by the Contractor ADD paragraph B, "B. Design of piping supports and anchoring system for new equipment." Page 1 of 4

3 Addendum No. 2 Section PRICE AND PAYMENT PROCEDURES Section COATING AND LINING Section , page 7, Article 3.01 BID ITEM 10: SE 062- Concrete and Structural Repair DELETE entire BID ITEM 10, paragraph A., A. Payment for all labor, material, and equipment for the concrete repairs, coating and grouting for the Archimedes screw pump as shown on the drawings and as described in the specifications will be made at the Lump Sum price bid therefore in the Schedule of Bid Prices. and REPLACE with A. Payment for all labor, material, and equipment for the concrete/spall repairs, coating and grouting for the Archimedes screw pump assuming 100 linear feet of crack repairs and 100 square feet of spall repairs and as shown in the contract documents will be made at the Lump Sum price bid therefore in the Schedule of Bid Prices. Section , page 7, Article 2.02.A Exterior Coating System DELETE and Mandoors/Rolling Service Doors Section PIPING GENERAL Section IDENTIFICATION FOR PROCESS PIPING AND EQUIPMENT Section PIPE SUPPORTS Section DUCTILE IRON PROCESS PIPE CEMENT LINED Section PROCESS VALVES Section FLOW METERS AND DENSISTY METERS Drawings Drawing G-0002 DRAWING LIST (1 OF 2) Section , page 8, Article 2.02.B Exterior Coating System for Stainless Steel Compressed Air and Seal Water Piping DELETE entire paragraph 2 2. Fittings shall be fusion epoxy coated or asphaltic coating in accordance with ANSI/AWWA C153/A21.53 and ANSI/AWWA C116/A DELETE Section in its entirety and REPLACE with (REV 1) Section , page 3, Article 2.02 Pipe Markers DELETE entire paragraph F, F. Lettering color for all markers shall be black except for black markers. Black markers shall have white lettering. Section , page 3, Article 2.01 General Requirements DELETE: paragraph L in the 3 rd Sentence, Miscellaneous Metalwork and REPLACE with Post-Installed Anchors Section , page 5, Article 2.04 Cement-Mortar Lining DELETE entire paragraph B, B. The minimum lining thickness shall be as follows: and accompanying table. Section , page 5, Article 2.05 Cement Mortar Lining DELETE: in paragraph A, thoroughly cleaned and then given a shop coat of rust-inhibitive primer Section , page 11, Article 2.05.E Hose Bibs DELETE entire paragraph 3, 3. Male Camlock adapter shall be 1-1/2, Male NPT thread, and made of 316 stainless steel. and REPLACE with 3. Male Camlock adapter shall be 1-1/2, Male NPT thread, and made of 316 stainless steel. Male Camlock and PT coupling shall be by Proflow Dynamics or approved equal. Section , page 7, Article 2.04.J DELETE TS Analyzer manufacturer Toshiba LQ500 DELETE Drawing G-0002 in its entirety and REPLACE with G-0002 (REV 1)

4 Addendum No. 2 Drawing G-0003 DRAWING LIST (2 OF 2) Drawing M-0002 MECHANICAL DETAILS (1 OF 2) Drawing M-0005 MECHANICAL EQUIPMENT SCHEDULE SEP 040, 041, & VALVES Drawing 040-MD-1002 SEP 040/041 SEDIMENTATION BUILDINGS NO. 1 & 2 DEMOLITION DEWATERING ROOM PLAN VIEWS Drawing 960-M-1002 SEP PIPE GALLERY NEW PARTIAL PLAN VIEWS (1 OF 2) Drawing 960-M-3001 SEP PIPE GALLERY NEW SECTION VIEWS (1 OF 2) Drawing 960-M-3002 SEP PIPE GALLERY NEW SECTION VIEWS (2 OF 2) Reference Drawings Drawing REF-1 PRIMARY CHANNELS AND OPERATING ROOM PLAN Drawing REF-2 PRIMARY LONGITUDINAL SECTION Drawing REF-3 PRIMARY TRANSVERSE SECTIONS Drawing REF-4 PRIMARY SECTIONS AND DETAILS Drawing REF-5 MISCELLANEOUS DETAILS DELETE Drawing G-0003 in its entirety and REPLACE with G-0003 (REV 1) DELETE Drawing M-0002 in its entirety and REPLACE with M-0002 (REV 1) DELETE Drawing M-0005 in its entirety and REPLACE with M-0005 (REV 1) DELETE Drawing 040-MD-1002 in its entirety and REPLACE with 040-MD-1002 (REV 1) DELETE Drawing 960-M-1002 in its entirety and REPLACE with 960-M-1002 (REV 1) DELETE Drawing 960-M-3001 in its entirety and REPLACE with 960-M-3001 (REV 1) DELETE Drawing 960-M-3002 in its entirety and REPLACE with 960-M-3002 (REV 1) ADD Reference Drawing REF-1 For Reference Only ADD Reference Drawing REF-2 For Reference Only ADD Reference Drawing REF-3 For Reference Only ADD Reference Drawing REF-4 For Reference Only ADD Reference Drawing REF-5 For Reference Only Drawing REF-6 PRIMARY 062 DEMOLITION & NEW ROOF PLANS Drawing REF-7 PRIMARY 062 LOWER FLOOR-DEMOLITION & NEW LOWER FLOOR PLANS ADD Reference Drawing REF-6 For Reference Only ADD Reference Drawing REF-7 For Reference Only Page 3 of 4

5 Addendum No. 2 Attachments Specifications: Section LIST OF DRAWING SHEETS Section PIPING GENERAL (REV 1) Drawings: Drawing G-0002 (REV 1) DRAWING LIST (1 OF 2) Drawing G-0003 (REV 1) DRAWING LIST (2 OF 2) Drawing M-0002 (REV 1) MECHANICAL DETAILS (1 OF 2) Drawing M-0005 (REV 1) MECHANICAL EQUIPMENT SCHEDULE SEP 040, 041, & VALVES Drawing 040-MD-1002 (REV 1) SEP 040/041 SEDIMENTATION BUILDINGS NO. 1 & 2 DEMOLITION Drawing 960-M-1002 (REV 1) SEP PIPE GALLERY NEW PARTIAL PLAN VIEWS (1 OF 2) Drawing 960-M-3001 (REV 1) SEP PIPE GALLERY NEW SECTION VIEWS (1 OF 2) Drawing 960-M-3002 (REV 1) SEP PIPE GALLERY NEW SECTION VIEWS (2 OF 2) Reference Drawings (For Reference Only): Drawing REF-1 PRIMARY CHANNELS AND OPERATING ROOM PLAN Drawing REF-2 PRIMARY LONGITUDINAL SECTION Drawing REF-3 PRIMARY TRANSVERSE SECTIONS Drawing REF-4 PRIMARY SECTIONS AND DETAILS Drawing REF-5 MISCELLANEOUS DETAILS Drawing REF-6 PRIMARY 062 DEMOLITION & NEW ROOF PLANS Drawing REF-7 PRIMARY 062 LOWER FLOOR-DEMOLITION & NEW LOWER FLOOR PLANS END OF ADDENDUM NO. 2 Page 4 of 4

6 San Francisco Water Power Sewer Services of the San Francisco Public Utilities Commission Signatures: SOUTHEAST WATER POLLUTION CONTROL PLANT BUILDINGS 040, 041, 044, 060, 061, 062, 925, AND 960 MECHANICAL IMPROVEMENTS CONTRACT NO. WW-654?,4 p/t4 4- Kent-Minh, PE Project Engineer fr'juelal_va /zap Date: December 28, 2018 ADDENDUM NO. 1 Daniel Alvarado, PE Project Manager J eph Buitrag PE ontract Stand ds Engineer Signature: e son, Manager NOTICE TO PARTEES HOLDING SPECIFICATIONS AND CONTRACT PROPOSAL: The Contract Documents of the contract named above are hereby amended as follows: Page 1 of 2

7 Addendum No. 1 LOCATION CHANGE S s ecifications Section PROCESS VALVES Section FLOW METERS AND DENSITY METERS Section SCREW PUMPS Section SUMP PUMPS _I:v n iji.g2 Drawing M-0008 MECHANICAL EQUIPMENT SCHEDULE SEP 925 & SEP VALVES Drawing M-0009 MECHANICAL EQUIPMENT SCHEDULE PUMPS AND METERS Drawing SEP 960 P&ID UNIT PROCESS 04 PIPE GALLERY Drawing E-0005 LIGHTING FIXTURE SCHEDULE Drawing 040-E-1004 SEP 040 & 041 DEWATERING ROOMS ELECTRICAL PLAN Section , page 2, Article 1.01.F.2 DELETE "Remove and replace eight (8) 10" plug valves in kind" and REPLACE with "Remove and replace nine (9) 10" plug valves in kind" Section , page 2, Article 1.01.F.3 DELETE "Remove one (1) 6" flushing gate valve and replace with one (1) 6" pneumatically actuated plug valve" and REPLACE with "Remove one (1) 6" flushing plug valve and replace with one (1) 6" pneumatically actuated plug valve" Section , page 7, Article 2.04.J DELETE "Valmet" and REPLACE with "Metso" DELETE Section in its entirety and REPLACE with Section (REV 1) Section , page 6, Article 2.01.A DELETE "1. Flygt 2. Ebara 3. Barnes" and REPLACE with "1. Barnes 2. Flygt 3. Ebara" DELETE Drawing M-0008 in its entirety and REPLACE with M-0008 (REV 1) DELETE Drawing M-0009 in its entirety and REPLACE with M-0009 (REV 1) DELETE Drawing in its entirety and REPLACE with (REV 1) DELETE Drawing E-0005 in its entirety and REPLACE with E-0005 (REV 1) DELETE Drawing 040-E-1004 in its entirety and REPLACE with 040-E-1004 (REV 1) Attachments Specifications: Section SCREW PUMPS (REV 1) Drawings: Drawing M-0008 (REV 1) MECHANICAL EQUIPMENT SCHEDULE SEP 925 & SEP VALVES Drawing M-0009 MECHANICAL EQUIPMENT SCHEDULE PUMPS AND METERS Drawing (REV 1) SEP 960 P&lD UNIT PROCESS 04 PIPE GALLERY Drawing E-0005 (REV 1) LIGHTING FIXTURE SCHEDULE Drawing 040-E-1004 (REV 1) 040-E-1004 SEP 040 & 041 DEWATERING ROOMS ELECTRICAL PLAN END OF ADDENDUM NO. 1 Page 2 of 2