ADDENDUM NO. 4. Changes to the Project Book, Specifications, Contract Drawings and Questions and Responses

ADDENDUM NO. 4 DATE: September 28, 2018 INVITATION FOR BID: T180022483 - CSO Control Program Special Order 15A Division 47 - Screenings and Grit Removal Facilities DATED: August 6, 2018 BID DUE DATE: October 16, 2018 @ 2:30 p.m. EST (Change) BID OPENING DATE: October 16, 2018 @ 2:30 p.m. EST (Change) SUBJECT: Changes to the Project Book, Specifications, Contract Drawings and Questions and Responses PART 1: CHANGES TO PROJECT BOOK 1. In SPECIAL CONDITIONS OF THE CONTRACT Exhibit A, Attachment #4, Wage Determinations, delete General Decision Number: VA180166 01/12/2018 VA166 and replace with the General Decision Number: VA180166 06/15/2018 VA166 located at the end of this addendum in Appendix A. 2. In SPECIAL CONDITIONS OF THE CONTRACT Exhibit A, Attachment #4, Wage Determinations, delete General Decision Number: VA180049 01/05/2018 VA49 and replace with the attached General Decision Number: VA180049 005/04/2018 VA49 located at the end of this addendum in Appendix A. 3. On page 66 of the Project Book, after 2.1 B., add the following: 3.0 Wage Determination Use a. The Wage Determinations in General Decision Number: VA180049 005/04/2018 VA49 (Construction Type: Heavy) shall be used for all work depicted on Bid Drawings AG3 through and including AG31. b. The Wage Determinations in General Decision Number: VA180166 06/15/2018 VA166 (Construction Type Building) shall be used for all other work depicted on the remaining Bid Drawings. PART 2: CHANGES TO SPECIFICATIONS 1. In the table of contents, under DIVISION 11 EQUIPMENT, delete the following: Teledyne Isco 5800 Refrigerated Sampler 11400 2. In the table of contents, under DIVISION 14 - CONVEYING SYSTEMS, delete section title Jib Cranes and replace with Cranes and Hoisting Equipment. Addendum No. 4-1 - 09/2018

3. In the specification SECTION 01111 CONSTRUCTION MANAGER AND ENGINEER, PART 1 GENERAL, 1.2 DEFINITIONS, A., on Page 01111-1, delete (804) 355-9993 in the second sentence and replace with (800) 837-9779. 4. In the specification SECTION 01290 MEASUREMENT AND PAYMENT, PART 1 GENERAL, 1.7 SCHEDULE OF CONTRACT ITEMS, G. Contract Item 7: Additional Length of Micropiles, on Page 01290-8, insert Phase 2 before the word Additional. 5. In the specification SECTION 01290 MEASUREMENT AND PAYMENT, PART 1 GENERAL, 1.7 SCHEDULE OF CONTRACT ITEMS, G. Contract Item 7: Phase 2 Additional Length of Micropiles, on Page 01290-8, Sub-sections 1. Description: and 3. Payment: insert Phase 2 before the word Additional. 6. In the specification SECTION 01290 MEASUREMENT AND PAYMENT, PART 1 GENERAL, 1.7 SCHEDULE OF CONTRACT ITEMS, L. Contract Item 12: Preparation & Clean-up for River Flooding, on Page 01290-10, Sub-section 1. Description: delete 7 in the second paragraph sixth sentence and replace with 12. 7. In the specification SECTION 01335 LIMITATIONS ON SEQUENCE OF CONSTRUCTION, PART 1 GENERAL, 1.4 LIMITATIONS ON SEQUENCE OF CONSTRUCTION, I.3.b. (1), on Page 01335-6, add the following: (a) Install ground and building monitoring system and establish movement survey baseline data prior to sheet piling and excavation activities. 8. In the specification SECTION 01335 LIMITATIONS ON SEQUENCE OF CONSTRUCTION, PART 1 GENERAL, 1.4 LIMITATIONS ON SEQUENCE OF CONSTRUCTION, I.3.b. (1), on Page 01335-6, change paragraph numbers (a), (b), (c), (d) with (b), (c), (d), (e). 9. In the specification SECTION 01335 LIMITATIONS ON SEQUENCE OF CONSTRUCTION, PART 1 GENERAL, 1.4 LIMITATIONS ON SEQUENCE OF CONSTRUCTION, I., 2., after paragraph b., add the following: c. Provide a temporary power distribution panel board to operating equipment, influent screen and grit channel gates for the influent screen during installation of new MCC s. 10. In the specification SECTION 01335 LIMITATIONS ON SEQUENCE OF CONSTRUCTION, PART 1 GENERAL, 1.4 LIMITATIONS ON SEQUENCE OF CONSTRUCTION, I., 2. change paragraph numbers c., d., e., f., g., h., i., to d., e., f., g., h., i., j.,. 11. In the specification SECTION 01450 QUALITY CONTROL, PART 1 GENERAL, 1.7 COSTS OF INSPECTION, after paragraph C.5, on Page 01450-6, insert 1.8 ACCEPTANCE TESTS. 12. In the specification SECTION 01450 QUALITY CONTROL, PART 1 GENERAL, 1.7 COSTS OF INSPECTION, D, on Page 01450-6, delete ACCEPTANCE TESTS. Addendum No. 4-2 - 09/2018

13. In the specification SECTION 01450 QUALITY CONTROL, PART 1 GENERAL, 1.7 COSTS OF INSPECTION, D, on Pages 01450-6 and 01450-7, delete the paragraph numbers D, E and F and replace as A, B and C. 14. In the specification SECTION 01450 QUALITY CONTROL, PART 1 GENERAL, 1.8 FAILURE TO COMPLY WITH CONTRACT, on Page 01450-6, delete paragraph number 1.8 and replace with 1.9. 15. In the specification SECTION 01450 QUALITY CONTROL, at the end of Table 1450-1 Field Testing Checklist on Page 01450-44, after item QQQQ., insert the table in Appendix B Specifications. 16. In the specification SECTION 01500 CONSTRUCTION FACILITIES AND TEMPORARY CONTROLS, PART 1 GENERAL, 1.1 SECTION INCLUDES, on Page 01500-1, delete D. Temporary Construction. 17. In the specification SECTION 01500 CONSTRUCTION FACILITIES AND TEMPORARY CONTROLS, PART 1 GENERAL, 1.1 SECTION INCLUDES, L., on Page 01500-1, insert W before the words WTP Site Security. 18. In the specification SECTION 01500 CONSTRUCTION FACILITIES AND TEMPORARY CONTROLS, PART 1 GENERAL, 1.8 TEMPORARY CONTROLS, H. Erosion Control:, on Page 01500-8, insert Contract Drawings and before the word Specification. 19. In the specification SECTION 01500 CONSTRUCTION FACILITIES AND TEMPORARY CONTROLS, PART 1 GENERAL, 1.9 TRAFFIC REGULATION, on Page 01500-9, delete title TRAFFIC REGULATION and rename WWTP SITE SECURITY AND TRAFFIC REGULATION. 20. In the specification SECTION 01500 CONSTRUCTION FACILITIES AND TEMPORARY CONTROLS, PART 1 GENERAL, 1.9 TRAFFIC REGULATION, on Page 01500-9, delete Paragraph A and add the following: A. Parking: Provide and maintain suitable parking in designated or approved areas for the use of all construction workers and others performing work or furnishing services in connection with the Contract, to avoid any need for parking personal vehicles where they may interfere with public traffic or construction activities. All CONTRACTOR and subcontractor personnel shall park in the remote north lot and walk on to the site through the new east gate. Only contractor work vehicles required for the work will be allowed on site. B. Access: The contractor shall make provisions for a security guard with suitable climatecontrolled, weatherproof structure to monitor and record contractor activities for the duration of the construction. The guard station shall be located at the East Gate off Brander Street and shall be manned during all Contractor working hours. The guard shall be from a security firm with a minimum of 10 years experience in the security business. The contractor shall provide Addendum No. 4-3 - 09/2018

badges for all employees and subcontractor employees that can be verified by the security guard. Badges shall be laminated in plastic with a metal clip which has the following information: employee name, photograph, employing contractor, personnel number. The security guard shall maintain a daily log and maintain a file of personnel, vehicles, and deliveries entering and leaving the Plant site. All construction equipment, deliveries and subcontractors shall access the Plant site through the East Gate. No construction traffic shall travel through the main WWTP gate. 21. In the specification SECTION 01500 CONSTRUCTION FACILITIES AND TEMPORARY CONTROLS, PART 1 GENERAL, 1.9 TRAFFIC REGULATION, on Page 01500-9, delete the paragraph numbers B and C and replace as C and D. 22. In the specification SECTION 01500 CONSTRUCTION FACILITIES AND TEMPORARY CONTROLS, PART 1 GENERAL, on Page 01500-10, delete Paragraph 1.12 WWTP SITE SECURITY in its entirety. 23. Replace specification SECTION 01783 OPERATION AND MAINTENANCE MANUALS with the specification located at the end of this addendum in Appendix B. 24. In the specification SECTION 01820 TRAINING, PART 1 GENERAL, 1.4 HOURS OF TRAINING, A., on Page 01820-4, delete the table and replace with the following: Equipment Name Minimum Hours per Session Minimum Number of Sessions Gate and Operator and Controls 4 2 Mechanical Climber Screen (Grit 1) 4 2 Mechanical Chain and Rake Screen (Screenings and Grit Facility) 8 2 Grit Pumps and Controls 2 2 Grit Vortex and Controls 2 2 Grit Classifiers and Cyclones 2 2 Odor Control Fans and Controls 4 2 Odor Control Equipment and Controls 4 2 Screenings and Grit Building HVAC Equipment 6 2 Screenings and Grit Building Boiler/Hot Water Equipment 6 2 Field Mounted Instrumentation - 2 Phosphate Analyzer 2 2 Refrigerated Sampler 2 2 Addendum No. 4-4 - 09/2018

Signaling and Fire Alarm 4 2 Sump Pumps 2 2 Boilers and Boiler Room Equipment 4 2 Condensing Units 2 2 Air Coils 2 2 Terminal Heat Transfer Units 2 2 Ductwork Accessories 2 1 Fans 4 2 HVAC Controls 8 5 Air Monitoring 4 2 Uninterruptible Power Supply Systems 4 4 Adjustable Frequency Drives 4 6 Electrical Monitoring System 4 4 Motor Control Center 4 4 Digital Video System 4 4 Fiber Optic Cables 2 1 25. In the specification SECTION 02150 BYPASS PUMPING, PART 1 GENERAL, 1.1 DESCRIPTION, B.1, on Page 02150-1, delete Section 01300 - Submittals and replace with Section 01330 - Submittals. 26. In the specification SECTION 02150 BYPASS PUMPING, PART 1 GENERAL, 1.3 SYSTEM DESCRIPTION, D.1.a, on Page 02150-3, delete Division in the first sentence and replace with Diversion. 27. In specification SECTION 02251 SHORING,SHEETING AND BRACING, PART 1 GENERAL, 1.2 SUBMITTALS, B, on Page 02251-1, delete State where the construction will be performed in the first sentence and replace with Commonwealth of Virginia. 28. In the specification SECTION 02512 DISINFECTION, PART 1 GENERAL, 1.3 QUALITY ASSURANCE, on Page 02512-1, after paragraph 1.3 C., add the following: 1.4 SUBMITTALS A. Provide all submittals in accordance with Division 1 requirements including the following: pipe fill and drain procedures, equipment and apparatus including post disinfection treatment and disposal of the pipe contents. Addendum No. 4-5 - 09/2018

29. In the specification SECTION 03100 CONCRETE FORMWORK, PART 1 GENERAL, 1.1 SUMMARY, A. Section Includes:, 1. Architectural., on Page 03100-1, delete sub-section a and replace with the following: a. Exterior walls exposed to view, down to 6 inches below finish grade. b. Interior exposed walls, beams, columns and stairwells. c. Exposed undersides of floor slabs, roof slabs and stairs 30. In specification SECTION 03310 CAST-IN-PLACE-CONCRETE, PART 1 GENERAL, 1.1 SUMMARY, B. Architectural Concrete:, on Page 03310-1, delete sub-sections 2 to 3 and replace with the following: 2. Interior exposed walls, beams, columns and stairwells 3. Exposed undersides of floor slabs, roof slabs and stairs 31. In the specification SECTION 05400 COLD-FORMED METAL FRAMING, PART 1 GENERAL, 1.4 SUBMITTALS, C. Structural Calculations:, on Page 05400-2, delete state of the project. and replace with Commonwealth of Virginia.. 32. In the specification SECTION 05510 METAL GRATED STAIRS, PART 1 GENERAL, 1.4 SUBMITTALS, C., on Page 05510-2, delete state and replace with Commonwealth. 33. In the specification SECTION 05515 METAL PAN STAIRS, PART 1 GENERAL, 1.3 DESIGN REQUIREMENTS, A. Delegated Design:, on Page 05515-1, insert registered in the Commonwealth of Virginia after the word engineer, in the sentence. 34. In the specification SECTION 05520, HANDRAILS AND RAILINGS, PART 2 PRODUCTS, 2.5 FABRICATION, on Page 05520-6, after paragraph H., add the following: I. Provide expansion joints or provisions for movement for railing and toe board sections greater than 40 feet. 35. In the specification SECTION 05520 HANDRAILS AND RAILINGS, PART 2 PRODUCTS, 2.5 FABRICATION, on Page 05520-6, delete paragraph numbers I., J., K., L. and replace as J., K., L., M.. 36. In the specification SECTION 05531 METAL FLOOR GRATING AND PLATE, PART 1 GENERAL, 1.5 QUALIFICATIONS, A., on Page 05531-2, delete State and replace with Commonwealth. 37. In the specification SECTION 09511 ACOUSTICAL CEILINGS, PART 1 GENERAL, 1.2 REFERENCES, on Page 09511-1, after paragraph 1.2 A. 5., add the following: Addendum No. 4-6 - 09/2018

1.3 SUBMITTALS A. Provide all submittals in accordance with Division 1 requirements. 38. In the specification SECTION 09511 ACOUSTICAL CEILINGS, PART 1 GENERAL, 1.3 SPARE PARTS, on Page 09511-1, delete paragraph number 1.3 and replace with 1.4. 39. In the specification SECTION 10522 FIRE EXTINGUISHERS, PART 1 GENERAL, 1.2 QUALITY ASSURANCE, on Page 10522-1, after paragraph 1.2 A., add the following: 1.3 SUBMITTALS A. Provide all submittals in accordance with Division 1. 40. In the specification SECTION 11287 STAINLESS STEEL SLIDE GATES, PART 2 PRODUCTS, 2.6 SLIDE GATE ELECTRIC MOTOR OPERATORS NONMODULATING, R. Push Buttons and Selector Switches:, on Page 11287-11, delete paragraph R. and add the following: R. Local Display Module (LDM) Selector Switch and Push Buttons: Where the operator is 7 feet or less from the floor and in an accessible location, an LDM will be supplied. Local operation shall be by an Open and Close control knob and a Local-Stop-Remote selector knob with padlock capability in any position. Control knob shafts shall not penetrate the display/control module cover. Control knob position detection shall use Hall effect devices. Mechanical reed switches are not permitted. The actuator shall include three (3) long life-high intensity LED type pilot lights to indicate valve open, opening, closed, closing, stopped, and alarm conditions. Red & Green lights shall be reverse color programmable to indicate valve open and valve closed position as specified. The amber LED light shall indicate valve stopped in midposition. The local operation, display and calibration of actuator shall be through a LDM with LCD, liquid crystal display. For ease of operation the LDM shall be capable of being located parallel to and adjacent to the handcrank or on the front of the actuator s controls and perpendicular to the handcrank. The LDM shall be capable of being rotated in ninety degree increments for easier viewing. The liquid crystal display and LED lights shall be protected by an explosionproof tempered lime glass window. Plastic windows are not acceptable. S. Remote Display Module (RDM): An RDM shall be provided when the operator is more than 7 feet above the floor or in an inaccessible location and shall perform the same functions as the local display module LDM. The RDM control knobs shall not penetrate the display/control module cover. Control knob position detection shall use Hall effect devices. Mechanical reed switches are not permitted. The RDM shall be connected to the actuator with four wires (two wires for 24 Volts DC from actuator and two shielded twisted pair for RS-485 signal from the actuator) and shall be capable of being located up to 4000 ft from the actuator. Each actuator shall support a LDM, local display module and up to two RDMs. One RDM shall be powered from the actuator s 24 Volts DC power supply. The second RDM shall be powered from Addendum No. 4-7 - 09/2018

customer s 120 Volts AC power. Local and remote displays shall be highly visible. The LCD viewing window shall be explosionproof rated tempered lime-glass window. Plastic windows are not permitted. The RDM display shall be identical to the LDM display and shall allow remote operation, diagnostics and set up same as the LDM. RDM and LDM shall be equipped with safety sensing of each displays selector switch position. When either the RDM or the LDM selector switch is in stop position the actuator shall not be capable of being run from either location. 41. In the specification SECTION 11288 STOP LOGS AND STOP GATES, PART 2 PRODUCT, 2.3 STOP LOGS AND APPURTENANCES, A. Stop Logs:, 1., on Page 11288-3, delete on the Drawings. At the end of the sentence and replace with at the end of this Section. 42. In the specification SECTION 11306 NON-CLOG VORTEX PUMP, PART 1 GENERAL, 1.4 SUBMITTALS, B. Shop Drawings:, 5., on Page 11306-3, after the word Information add the following:, including lubrication type and identify if motor bearings require lubrication. 43. In the specification SECTION 11306 NON-CLOG VORTEX PUMP, PART 1 GENERAL, 1.6 SPARE PARTS, A. General:, on Page 11306-3, after sub-section 4., add the following: 5. One pump lower bushing 6. One pump impeller and one pump volute 44. In the specification SECTION 11306 NON-CLOG VORTEX PUMP, PART 2 PRODUCTS, 2.6 LUBRICATION, C. Lubrication Supply: on Page 11306-6, after the first sentence, insert Provide the lubrication identification for the oil contained in the oil reservoir. In the second sentence delete the word the and replace with each. 45. In the specification SECTION 11306 NON-CLOG VORTEX PUMP, PART 2 PRODUCTS, 2.9 CONSTANT SPEED BELT DRIVE, A., on Page 11306-7, at the end of the paragraph insert Provide adequate quantity of v-belts per assembly including corresponding part numbers.. 46. In the specification SECTION 11319 VORTEX GRIT REMOVAL SYSTEM, PART 1 GENERAL, 1.2 QUALITY ASSURANCE, B. Manufacturer s Qualifications: on Page 11319-1, insert s after the word installation. 47. In the specification SECTION 11319 VORTEX GRIT REMOVAL SYSTEM, PART 1 GENERAL, 1.2 QUALITY ASSURANCE, B. Manufacturer s Qualifications:, 1., on Page 11319-1, delete a in the second sentence and replace with provided for. 48. In the specification SECTION 11319 VORTEX GRIT REMOVAL SYSTEM, PART 1 GENERAL, 1.2 QUALITY ASSURANCE, B. Manufacturer s Qualifications:, 1., on Page 11319-1, delete An in the third sentence and replace with A. Addendum No. 4-8 - 09/2018

49. In the specification SECTION 11319 VORTEX GRIT REMOVAL SYSTEM, PART 1 GENERAL, 1.2 QUALITY ASSURANCE, B. Manufacturer s Qualifications:, 1. b., on Page 11319-1, after the word all delete chamber is and insert chambers is greater than. 50. In the specification SECTION 11319 VORTEX GRIT REMOVAL SYSTEM, PART 1 GENERAL, 1.2 QUALITY ASSURANCE, B. Manufacturer s Qualifications:, 2., on Page 11319-2, in the first sentence delete an. 51. In the specification SECTION 11319 VORTEX GRIT REMOVAL SYSTEM, PART 1 GENERAL, 1.2 QUALITY ASSURANCE, B. Manufacturer s Qualifications:, 2., on Page 11319-2, in the second sentence delete in 1.2.E. and replace with specified in 1.3.E.. 52. In the specification SECTION 11319 VORTEX GRIT REMOVAL SYSTEM, PART 1 GENERAL, 1.2 QUALITY ASSURANCE, C. Coordination Responsibility:, 1., on Page 11319-2, delete 11321 and 11306 and replace with 11306 and 11321. 53. In the specification SECTION 11319 VORTEX GRIT REMOVAL SYSTEM, PART 1 GENERAL, 1.3 SYSTEM DESCRIPTION, D., on Page 11319-3, delete 30 mgd and replace with 70mgd. 54. In the specification SECTION 11319 VORTEX GRIT REMOVAL SYSTEM, PART 1 GENERAL, 1.4 SUBMITTALS, E., on Page 11319-4, before paragraph E., add the following: E. Qualifications of manufacturer s field service representative to supervise performance testing of the vortex grit removal system equipment. 55. In the specification SECTION 11319 VORTEX GRIT REMOVAL SYSTEM, PART 1 GENERAL, 1.4 SUBMITTALS, E., on Page 11319-4, delete paragraph number E. and replace as F.. 56. In the specification SECTION 11319 VORTEX GRIT REMOVAL SYSTEM, PART 1 GENERAL, 1.4 SUBMITTALS, F., on Page 11319-4, delete paragraph F Seismic Anchorage and Bracing:. 57. In the specification SECTION 11319 VORTEX GRIT REMOVAL SYSTEM, PART 1 GENERAL, 1.5 SPARE PARTS, A. General:, on Page 11319-4, after sub-section 3., add the following: 4. One year supply of motor grease and lubrication. 5. One grit chamber drive motor. 58. In the specification SECTION 11319 VORTEX GRIT REMOVAL SYSTEM, PART 2 PRODUCTS, 2.2 COMPONENTS, G. Grit Fluidizer: on Page 11319-5, in the second paragraph after the word heavy insert Type. Addendum No. 4-9 - 09/2018

59. In specification SECTION 11319 VORTEX GRIT REMOVAL SYSTEM, PART 3 EXECUTION, 3.1 MANUFACTURER S SERVICES, on Page 11319-6, subsection A, in the schedule under Service delete Installation and replace with Concrete and Equipment Installation. 60. In specification SECTION 11319 VORTEX GRIT REMOVAL SYSTEM, PART 3 EXECUTION, 3.1 MANUFACTURER S SERVICES, on Page 11319-6, subsection A, in the schedule Number of Trips for Installation Service, delete 1 and replace with 3. 61. In the specification SECTION 11319 VORTEX GRIT REMOVAL SYSTEM, PART 3 EXECUTION, 3.1 MANUFACTURER S SERVICES, on Page 11319-6, insert the following: B. Provide assistance during structural concrete placement to include observation, guidance and coordination of construction joint locations and placement sequence to accommodate the new Vortex Grit Removal equipment and maintain installation tolerances within acceptable limits. 62. In the specification SECTION 11319 VORTEX GRIT REMOVAL SYSTEM, PART 3 EXECUTION, 3.3 FIELD QUALITY CONTROL, A. Manufacturer s Field Service: on Page 11319-7, delete manufacturers in the first sentence and replace with manufacturer. 63. In the specification SECTION 11319 VORTEX GRIT REMOVAL SYSTEM, PART 3 EXECUTION, 3.4 PERFORMANCE TESTING, A., on Page 11319-7, in the first sentence, after the word efficiency insert a period(.), delete and submitted to and reviewed and approved by the ENGINEER and replace with Submit to the ENGINEER for review and approval. 64. In the specification SECTION 11319 VORTEX GRIT REMOVAL SYSTEM, PART 3 EXECUTION, 3.4 PERFORMANCE TESTING, B. Head loss tests:, on Page 11319-8, at the end of the paragraph, add the following: Range of flow between minimum and maximum specified in Paragraph 1.3. 65. In the specification SECTION 11321 GRIT SEPARATION AND CLASSIFYING EQUIPMENT, PART 1 GENERAL, 1.6 SPARE PARTS, on Page 11321-3, after subsection 4, add the following: 5. Two liners for the cyclone separator. 66. Delete specification SECTION 11400 REFRIGERATED SAMPLER. 67. In the specification SECTION 13851 SIGNALING AND ALARM, on Page 13851-1, in the section title, before the word ALARM insert FIRE. Addendum No. 4-10 - 09/2018

68. In the specification SECTION 14650 CRANES AND HOISTING EQUIPMENT, 1.3 SYSTEM DESCRIPTION, B. Performance Requirements:, 2. Gantry Crane:, on Page 14650-4, insert Rolling before the word Gantry. 69. In the specification SECTION 14650 CRANES AND HOISTING EQUIPMENT, 1.3 SYSTEM DESCRIPTION, B. Performance Requirements:, 2. Gantry Crane:, on Page 14650-4, in Table ITEM delete FSJ-1 and FSJ-2 and replace with RG-1 and RG-2. 70. In the specification SECTION 14650 CRANES AND HOISTING EQUIPMENT, PART 3 EXECUTION, 3.2 FIELD QUALITY CONTROL, A. Manufacturer's Field Service: on Page 14650-11, delete open and closed parenthesis in the paragraph. 71. Replace specification SECTION 15106 DUCTILE-IRON PIPE FITTINGS with the specification located at the end of this addendum in Appendix B. 72. In the specification SECTION 15110 VALVES, PART 2 PRODUCT, 2.15 ELECTRIC MOTOR OPERATORS - NONMODULATING, A. General: on Page 15110-16, delete open and closed parenthesis in the paragraph. 73. In the specification SECTION 15110 VALVES, PART 2 PRODUCT, 2.15 ELECTRIC MOTOR OPERATORS - NONMODULATING, D. Open and Close Time Periods: on Page 15110-16, delete 60 seconds in the first sentence and replace with 30 seconds. 74. In the specification SECTION 15110 VALVES, PART 2 PRODUCT, 2.15 ELECTRIC MOTOR OPERATORS - NONMODULATING, R. Push Buttons and Selector Switches:, on Page 15110-18, delete paragraph R. and add the following: R. Local Display Module (LDM) Selector Switch and Push Buttons: Where the operator is 7 feet or less from the floor and in an accessible location, an LDM will be supplied. Local operation shall be by an Open and Close control knob and a Local-Stop-Remote selector knob with padlock capability in any position. Control knob shafts shall not penetrate the display/control module cover. Control knob position detection shall use Hall effect devices. Mechanical reed switches are not permitted. The actuator shall include three (3) long life-high intensity LED type pilot lights to indicate valve open, opening, closed, closing, stopped, and alarm conditions. Red & Green lights shall be reverse color programmable to indicate valve open and valve closed position as specified. The amber LED light shall indicate valve stopped in midposition. The local operation, display and calibration of actuator shall be through a LDM with LCD, liquid crystal display. For ease of operation the LDM shall be capable of being located parallel to and adjacent to the handcrank or on the front of the actuator s controls and perpendicular to the handcrank. The LDM shall be capable of being rotated in ninety degree increments for easier viewing. The liquid crystal display and LED lights shall be protected by an explosionproof tempered lime glass window. Plastic windows are not acceptable. Addendum No. 4-11 - 09/2018

S. Remote Display Module (RDM): An RDM shall be provided when the operator is more than 7 feet above the floor or in an inaccessible location and shall perform the same functions as the local display module LDM. The RDM control knobs shall not penetrate the display/control module cover. Control knob position detection shall use Hall effect devices. Mechanical reed switches are not permitted. The RDM shall be connected to the actuator with four wires (two wires for 24 Volts DC from actuator and two shielded twisted pair for RS-485 signal from the actuator) and shall be capable of being located up to 4000 ft from the actuator. Each actuator shall support a LDM, local display module and up to two RDMs. One RDM shall be powered from the actuator s 24 Volts DC power supply. The second RDM shall be powered from customer s 120 Volts AC power. Local and remote displays shall be highly visible. The LCD viewing window shall be explosionproof rated tempered lime-glass window. Plastic windows are not permitted. The RDM display shall be identical to the LDM display and shall allow remote operation, diagnostics and set up same as the LDM. RDM and LDM shall be equipped with safety sensing of each displays selector switch position. When either the RDM or the LDM selector switch is in stop position the actuator shall not be capable of being run from either location. 75. In the specification SECTION 15110 VALVES, PART 2 PRODUCT, 2.15 ELECTRIC MOTOR OPERATORS - NONMODULATING, S. Limit and Torque Switches:, on Page 15110-18, delete the paragraph number S. and replace with T.. 76. In the specification SECTION 15110 VALVES, PART 2 PRODUCT, 2.15 ELECTRIC MOTOR OPERATORS - NONMODULATING, T. Additional Accessories:, on Page 15110-19, before paragraph T., insert the following: U. Circuit Breaker Module (CBM): Where shown, provide the operator with a NEMA 6P rated CBM. The CBM shall interrupt the circuit between the actuator and the incoming power supply. The CBM shall be mounted in a separate electrical compartment which is close-coupled to the actuator. 77. In the specification SECTION 15110 VALVES, PART 2 PRODUCT, 2.15 ELECTRIC MOTOR OPERATORS - NONMODULATING, T. Additional Accessories:, on Page 15110-19, delete the paragraph number T. and U. and replace with V. and W.. 78. In the specification SECTION 15850 AIR OUTLETS AND INLETS, PART 3 EXECUTION, 3.2 INSTALLATION, D. Location: on Page 15850-8, delete indicated on general construction "Reflected Ceiling Plans" and replace with shown. 79. In the specification SECTION 15946 AIR MONITORING, PART 2 PRODUCTS, 2.12 TRAINING, A., on Page 15946-17, delete 01670 in the second sentence and replace with 01820. Addendum No. 4-12 - 09/2018

80. In the specification SECTION 16020 TEMPORARY ELECTRICAL SYSTEM, PART 1 GENERAL, 1.4 SYSTEM DESCRIPTION, C., on Page 16020-2, delete Resident Engineer in the first sentence and replace with City. 81. In the specification SECTION 16020 TEMPORARY ELECTRICAL SYSTEM, PART 1 GENERAL, 1.4 SYSTEM DESCRIPTION, C. 2., on Page 16020-2, delete Resident Engineer s field office and replace with the City s existing facilities. 82. In the specification SECTION 16020 TEMPORARY ELECTRICAL SYSTEM, PART 1 GENERAL, 1.4 SYSTEM DESCRIPTION, C. 3., on Page 16020-2, delete - in the second sentence. 83. In the specification SECTION 16020 TEMPORARY ELECTRICAL SYSTEM, PART 1 GENERAL, 1.4 SYSTEM DESCRIPTION, on Page 16020-2, delete paragraph F. 84. In the specification SECTION 16020 TEMPORARY ELECTRICAL SYSTEM, PART 1 GENERAL, 1.5 ENGINEERING REQUIREMENTS, B. 1., on Page 16020-2, delete Resident Engineer trailer complex and replace with City s existing facilities. 85. In the specification SECTION 16020 TEMPORARY ELECTRICAL SYSTEM, PART 1 GENERAL, 1.5 ENGINEERING REQUIREMENTS, B. sub-section 5. on Page 16020-3, delete the word attached and insert located at the end of this section after the Sketch 59-1.05B. 86. In the specification SECTION 16020 TEMPORARY ELECTRICAL SYSTEM, PART 1 GENERAL, 1.7 QUALITY ASSURANCE, E., on Page 16020-4, delete Commissioner in the first sentence and replace with Construction Manager. 87. In the specification SECTION 16020 TEMPORARY ELECTRICAL SYSTEM, PART 1 GENERAL, 1.7 QUALITY ASSURANCE, E., on Page 16020-4, delete (as specified in 1.04F hereinbefore) in the second sentence and replace with as specified in 1.4F hereinbefore. 88. In the specification SECTION 16020 TEMPORARY ELECTRICAL SYSTEM, PART 2 PRODUCTS, 2.1 ELECTRICAL SERVICE CONNECTION, A., Page 16020-4, after the first sentence, insert Coordinate location with the Construction Manager. 89. In the specification SECTION 16020 TEMPORARY ELECTRICAL SYSTEM, PART 2 PRODUCTS, 2.2 RACEWAYS AND WIRING, B., on Page 16020-5, delete Commissioner in the second sentence and replace with ENGINEER. 90. In the specification SECTION 16020 TEMPORARY ELECTRICAL SYSTEM, PART 3 EXECUTION, 3.2 OPERATION, A., on Page 16020-6, delete each working day from 6:00 A.M. to 6:00 P.M., from Monday to Friday inclusive. and replace with continuously for the duration of the work until permanent electrical facilities and service can be provided. Addendum No. 4-13 - 09/2018

91. In the specification SECTION 16020 TEMPORARY ELECTRICAL SYSTEM, PART 3 EXECUTION, 3.2 OPERATION, on Page 16020-6, delete paragraph B. 92. In the specification SECTION 16020 TEMPORARY ELECTRICAL SYSTEM, PART 3 EXECUTION, 3.4 REMOVAL, A., on Page 16020-6, delete Commissioner in the first sentence and replace with Construction Manager. 93. In the specification SECTION 16020 TEMPORARY ELECTRICAL SYSTEM, PART 3 EXECUTION, Sketch 59-1.05B, on Page 16020-7, delete the sketch and replace with the following: Addendum No. 4-14 - 09/2018

94. In the specification SECTION 16264 UNINTERRUPTIBLE POWER SUPPLY SYSTEMS, PART 1 GENERAL, 1.1 SUMMARY, B, sub-section 1. on Page 16264-1, delete Section 01670 and replace with 01820. 95. In the specification SECTION 16264 UNINTERRUPTIBLE POWER SUPPLY SYSTEMS, PART 3 EXECUTION, 3.2 FIELD QUALITY CONTROL, C. Manufacturer's Field Services: on Addendum No. 4-15 - 09/2018

Page 16264-17, delete Section 01670 at the end of the sentence and replace with Section 01820. 96. In the specification SECTION 16266 ADJUSTABLE FREQUENCY DRIVES, PART 1 GENERAL, 1.1 SUMMARY, B. 1., on Page 16266-1, delete Section 01670 and replace with Section 01820. 97. In the specification SECTION 16266 ADJUSTABLE FREQUENCY DRIVES, PART 1 GENERAL, 1.7 SPARE PARTS AND SERVICE, B. General:, 1. d., on Page 16266-6, delete, indicating lights. 98. In the specification SECTION 16266 ADJUSTABLE FREQUENCY DRIVES, PART 1 GENERAL, 1.7 SPARE PARTS AND SERVICE, B. General:, 1. n., on Page 16266-6, after the word laptop, insert including software license for City programming and troubleshooting. 99. In the specification SECTION 16266 ADJUSTABLE FREQUENCY DRIVES, PART 2 PRODUCTS, 2.3 COMPONENTS, C. Programmable Controller:, on Page 16266-9, delete Section 13400 Instrumentation and replace with Sections 13451 and 13453. 100. In the specification SECTION 16266 ADJUSTABLE FREQUENCY DRIVES, PART 3 EXECUTION, 3.2 FIELD QUALITY CONTROL, C. Manufacturer s Field Services Representative: on Page 16266-12, delete Section 01670 at the end of the sentence and replace with Section 01820. 101. In the specification SECTION 16291 ELECTRICAL MONITORING SYSTEM, PART 1 GENERAL, 1.1 SUMMARY, B. 1., on Page 16291-1, delete Section 01670 and replace with Section 01820. 102. In the specification SECTION 16445 MOTOR CONTROL CENTERS, PART 1 GENERAL, 1.1 SUMMARY, B. 1., on Page 16445-1, delete Section 01670 and replace with Section 01820. 103. In the specification SECTION 16752 DIGITAL VIDEO SYSTEM, PART 1 GENERAL, 1.1 SECTION INCLUDES, B. 1., on Page 16752-1, delete Section 01670 and replace with Section 01820. 104. In the specification SECTION 16752 DIGITAL VIDEO SYSTEM, PART 1 GENERAL, 1.4 REFERENCE ABBREVIATIONS, A. sub-section 2. on Page 16752-2, delete DVRS and replace with DVMRS. 105. In the specification SECTION 16752 DIGITAL VIDEO SYSTEM, PART 1 GENERAL, 1.5 SYSTEM DESCRIPTION, B., on Page 16752-2, delete DVRS in the first sentence and replace with DVMRS. Addendum No. 4-16 - 09/2018

106. In the specification SECTION 16752 DIGITAL VIDEO SYSTEM, PART 1 GENERAL, 1.5 SYSTEM DESCRIPTION, B., on Page 16752-2, delete engineering in the last sentence and replace with contract. 107. In the specification SECTION 16752 DIGITAL VIDEO SYSTEM, PART 3 DELIVERY, STORAGE, AND HANDLING, 3.6 FIELD SERVICES, A. Manufacturer s Representative:, on Page 16752-13, delete Section 01670 in the fourth sentence and replace with Section 01820. 108. In the specification SECTION 17020 MODIFICATIONS TO EXISTING PLANT PCS SYSTEM, PART 3 EXECUTION, 3.6 TESTS, B., on Page 17020-9, delete Section 01650 and replace with Section 01655. 109. In the specification SECTION 17143 PROCESS CONTROL SYSTEM FACTORY ACCEPTANCE TESTING, PART 1 GENERAL, 1.1SUMMARY, B, delete the word weeks in the last sentence and replace with the word months. 110. In the specification SECTION 17143 PROCESS CONTROL SYSTEM FACTORY ACCEPTANCE TESTING, PART 1 GENERAL, 1.1 SUMMARY, I. 2., on Page 17143-2, delete Section 01670 and replace with Section 01820. 111. In the specification SECTION 17143 PROCESS CONTROL SYSTEM FACTORY ACCEPTANCE TESTING, PART 1 GENERAL, 1.2 SUBMITTALS, B., on Page 17143-2, delete Section 40 90 00 and replace with Section 17200. 112. In specification SECTION 17166 PROCESS CONTROL SYSTEM COMMISSIONING, PART 1 GENERAL, 1.1 SUMMARY,C, sub-section 2, on Page 17166-1, delete Section 01670 and replace with Section 01820. 113. In the specification SECTION 17166 PROCESS CONTROL SYSTEM COMMISSIONING, PART 2 SITE ACCEPTANCE TESTING, 2.4 PURPOSE AND SCOPE, A., on Page 17166-6, delete s from the word Staffs in the first sentence. 114. In the specification SECTION 17166 PROCESS CONTROL SYSTEM COMMISSIONING, PART 3 EXECUTION, 3.3 DEFECT HANDLING, A., on Page 17166-10, delete changes in the first sentence and replace with modifications or adjustments. 115. In the specification SECTION 17166 PROCESS CONTROL SYSTEM COMMISSIONING, PART 3 EXECUTION, 3.3 DEFECT HANDLING, E. and F., on Page 17166-11, delete Change Requests and replace with Request for Modifications. 116. In the specification SECTION 17166 PROCESS CONTROL SYSTEM COMMISSIONING, PART 3 EXECUTION, 3.3 DEFECT HANDLING, F., on Page 17166-11, delete change request and replace with Request For Modifications. Addendum No. 4-17 - 09/2018

117. In the specification SECTION 17176 PROCESS CONTROL SYSTEM TRAINING, PART 1 GENERAL, 1.1 REQUIREMENTS AND RESPONSIBILITIES, F. and G.2., on Page 17176-1, delete Section 01670 and replace with Section 01820. 118. In specification Section 17176 PROCESS CONTROL SYSTEM TRAINING, PART 1 GENERAL, 1.1 REQUIREMENTS AND RESPONSIBILITIES, G.6 on Page 17176-2, insert the word Refrigerated before Sampler. 119. In the specification SECTION 17176 PROCESS CONTROL SYSTEM TRAINING, PART 1 GENERAL, 1.2 SUBMITTALS, B., on Page 17176-2, delete within 180 days of the effective date of the Notice to Proceed,. 120. In the specification SECTION 17176 PROCESS CONTROL SYSTEM TRAINING, PART 1 GENERAL, 1.3 ON-SITE TRAINING, D. Generic Training Requirements:, 1., on Page 17176-2, delete Section 01670 and replace with Section 01820. 121. In the specification SECTION 17176 PROCESS CONTROL SYSTEM TRAINING, PART 3 EXECUTION, 3.1 TRAINING, A., on Page 17176-5, delete Section 01670 and replace with Section 01820. 122. In the specification SECTION 17299 PROCESS CONTROL SYSTEM INPUT/OUTPUT LIST, PART 1 GENERAL, 1.1 DESCRIPTION, B., 2., on Page 17299-1, delete Section 01670 and replace with Section 01820. 123. In the specification SECTION 02251 SHORING, SHEETING AND BRACING, PART 3 EXECUTION, 3.1 SHORING, SHEETING AND BRACING INSTALATION, after G. add the following: H. Prior to the start of installation of excavation support systems, the Contractor shall perform a field survey including photographs as necessary to record existing conditions at the site. During construction, the Contractor shall provide monitors and record information to detect any movement of the excavation support system and adjacent utilities and structures. Monitoring devices shall be installed at all adjacent utilities and existing structures to the new Screen and Grit Removal Building. The monitoring program and information recorded therefrom shall be designed and sealed by the registered Professional Engineer retained by the Contractor for excavation support systems work and submitted weekly for the Engineer's records. Addendum No. 4-18 - 09/2018

PART 3: CHANGES TO CONTRACT DRAWINGS 1. On Cover Sheet change OWNER CONTRACT INFORMATION to OWNER CONTACT INFORMATION. 2. On Drawing AG2, revise the location of the Guard Shack by deleting the two Guard Shack locations shown adjacent the Temp Contractor Trailer, Parking and Laydown Area and east of the new Diversion Chamber and relocate a single Guard Shack south of Supplemental Pumping Station at the East Construction Entrance off the Access Road. 3. On Drawing AG4, delete the TEMP GUARD SHACK SEE NOTE 5 from Detail 2/AG4 Erosion and Sediment Control Practices. Delete Note 5 and renumber following notes accordingly. 4. On Drawing AG5, Detail 1/AG5 Erosion and Sediment Control Practices locate Temporary Guard Shack near the Inlet Protection shown in the south east quadrant and include label APPROXIMATE LOCATION OF TEMP GUARD SHACK SEE NOTE 4. 5. On Drawing AG8, in the last sentence of Note 2, replace the Specification reference from 02220 to 01500. In the last sentence of Note 8 replace State with Commonwealth. 6. On Drawing AG9, replace Note 3 with 3. Contractor shall install signs previously removed during demolition. Refer to DWG AG8. Contractor shall coordinate location of signs with Owner. 7. On Drawing AG9, delete location and reference to Temp Guard Shack shown north and east of the New Diversion Chamber. 8. Replace Drawing AG12 with revised Drawing AG12 located in Appendix C at the end of this Addendum. 9. Replace Drawing AG15 with revised Drawing AG15 located in Appendix C at the end of this Addendum. 10. In Profile 1 on Drawing AG16, label manhole located at Station 11+61.56 MH 1. In Profile 2, label manholes located at Station 10+27.50 and Station11+00.59 MH2 and MH 3 respectively. 11. In Profile 3 on Drawing AG17, label manhole located at Station 10+42.97 MH4. 12. In Profile 4 on Drawing AG18, label manholes located at Station 10+72.35, Station 12+57.14, Station 13+48.69 and Station 13+82.03 MH5, MH6, MH7 and MH8 respectively. 13. On Drawing AG19, in the last sentence of Note 2, replace the Specification reference from 01330 to 01335. Addendum No. 4-19 - 09/2018

14. In the Influent Pipe Plan on Drawing AG20, label the new manhole on the New 8 Sanitary Sewer New MH1 and the new manhole on the New 8 Drain New MH8. 15. Replace Drawing AG27 with revised Drawing AG27 located in Appendix C at the end of this Addendum. PART 3: REPLIES TO QUESTIONS 1. We respectfully request the engineer to add Perry Fiberglass Products, Inc / Envirogen Technologies to Section 11395 Odor Control Equipment: Bio-towers Part 2.01. Reply 1: We already have designed the Odor Control Equipment around two manufacturers systems. The IFB contains provisions for submission of equivalent equipment from other manufacturers. However, at this stage of the project, the burden is with the manufacturer and bidding general contractors to determine the suitability of any proposed alternate equipment manufacturer s system and weigh potential impacts to other aspects of the project design such as: will the equipment fit in the space available, does the change impact other portions of the design such as electrical and instrumentation, does the alternative equipment provide the same or better performance that the design basis equipment, does the alternate equipment have equivalent or better life cycle costs and maintenance and parts support, etc. To ensure a level playing field for bidders, we require that the base bid be based upon using one of the specified equipment manufacturers and models. It should be pointed out that there is a cost to the City to have our engineering consultants evaluate any proposed alternative equipment, therefore alternate equipment submittals that are not properly and thoroughly documents will generally not be approved. Due to the cost of evaluating alternative equipment, this step is done after bids are opened and the prospective low responsive and responsible bidder is determined. Please refer to the IFB N0. T180022483 Project Book, under Bid Form, Instruction to Bidders: (page 8 of 66) (1), for the procedure to submit an Or Equal to the named equipment in the Major Equipment Schedule. Please also refer to specification SECTION 1600 MATERIAL AND EQUIPMENT, PART 1 GENERAL, 1.4 OR EQUAL SUBMITTAL. 2. Regarding the subject project specification section 151062.2.k.3 indicates all DI Grit pipe and fittings are to have Pro401 lining or equal whereas, the Pipe Schedule in section 15109 pg. 9 indicates the Grit pipe is to be Glass lined. Which is correct? Reply 2: See PART 2: CHANGES TO SPECIFICATIONS, Item No. 71. Addendum No. 4-20 - 09/2018