DOCUMENT ADDENDUM

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1 DOCUMENT ADDENDUM KILLIAN CREEK WWTP UPGRADE LINCOLN COUNTY, NORTH CAROLINA WKD Project Number CL ADDENDUM NUMBER 1 June 11, 2015 BID DATE: June 25, 2015, 2:00 PM TO ALL BIDDERS: Below are changes and/or clarifications to the bid documents for this project. CONTRACTING REQUIREMENTS 1. REVISE Section Bid Form A. The Bid Form is to be reissued in whole in a later Addendum to reflect the following revisions: I. Schedule A. Tabulation of Major Equipment and Products - ADD Specification Description Base Bid Equipment or Products Mfg Polymer Blending & Feed Equip. Rotary Drum Filter Press Supervisory Control and Data Acquisition (SCADA) for Base Bid and Owner Elective Items Alternative Owner Preferred Equip. or Product Mfg Excell Feeders, Inc. Dorsett Technologies Addition/ Deduct to Base Bid Price for Alternative Owner Preferred Equip. or Product $ $ Lincoln County Addendum No. 1 Killian Creek WWTP Upgrade WKD Project Number: CL

2 DOCUMENT ADDENDUM II. Schedule B. Tabulation of Owner Additive Alternative Bid Item Costs REVISE: SCHEDULE B. TABULATION OF OWNER ADDITIVE ALTERNATE BID ITEM COSTS: Specification Description Equipment Mfg/Supplier Total Installed Cost A. Rotary Drum Thickener Equipment and Field Erected Precast Concrete Building. Polymer Blending & Feed Equipment (PD-3) $ 2. REVISE - Specification Summary A. ADD - Item 1.2.A.8 Polymer Blending & Feed Equipment (PD-2) for the Rotary Filter Press. B. ADD Item 1.2.A.9 Supervisory Control and Data Acquisition (SCADA) for both Base Bid and Owner Additive Elective Equipment Items and Products. C. ADD - Paragraph 1.2.B.1 Bid Item A: The total installed cost is to include the Rotary Drum Thickener, Field Erected Precast Building and Polymer Blending & Feed Equipment (PD-3) associated with the Rotary Drum Thickener. After bid award and prior to final selection of the Owner Additive Alternative Bid for the Rotary Drum Thickener (Specification Section ), the proposed manufacture will be requested to submit information regarding typical polymer usage for waste activated sludge applications and installation references. The proposed manufacture may then be requested to perform confirmation polymer and dewatering performance bench testing at no cost to the Owner, with waste activated sludge samples from the Killian Creek WWTP. The testing is to be performed utilizing the manufacturer s recommended polymer and the polymer currently utilized by the Owner for dewatering to establish a maximum polymer dosage and minimum thickened sludge concentration. Lincoln County Addendum No. 1 Killian Creek WWTP Upgrade WKD Project Number: CL

3 DOCUMENT ADDENDUM At the Owner s election, a selected alternative manufacturer may be provided the opportunity to perform the same testing to provide data for alternative system. The resulting polymer and performance data will be utilized by the Owner evaluate life cycle costs for the respective manufacturers taking into consideration any added cost to the Contractors bid for the competitive equipment. Final equipment procurement may also include a negotiated performance based guarantee and penalty should the installed equipment fail to meet a performance guarantee. D. Paragraph 1.5.A.2 - I. Work associated with the piping revision in the sludge holding tank is to be scheduled prior to the work to install piping in the digesters to permit operational flexibility during work requiring lowering digester levels. II. The new effluent filter #3 is to be installed prior to work associated with the post equalization pumps and mixers to provide additional filter capacity for drainage of the post equalization tank. III. Work requiring access to the bottom of the post equalization must be scheduled in off hours between midnight and 8 am to facilitate drainage of the tank and retainage of flow within the post equalization tank. TECHNICAL SPECIFICATIONS 1. CLARIFICATION Specification Section Process Piping, Fittings, Valves and Accessories A. Paragraph 2.7.B Gaskets for flanged pipe are to be Toruseal or equal, 1/8 Styrene Butadiene (SBR) rubber conforming to ANSI/AWWA C111/A21.11 for Ductile Iron Pipe and ASTM F-477 for plastic pipe. 2. CHANGE - Specification Section Ultraviolet Disinfection Equipment A. Paragraph 2.12.I.1 Delete paragraph and add the following: I. SCADA System Output - The existing plant UV system has been modified to eliminate hardwired monitoring of the UV system via SCADA. Those modifications include the addition of a Modbus TCP communications link between the UV system and SCADA RTU3. This Modbus TCP communications link will accommodate monitoring of the new UV channel equipment to be installed as part of this project. The UV vendor shall provide I/O mapping information for coordination with the SCADA integrator to accommodate SCADA monitoring of the UV system status. Lincoln County Addendum No. 1 Killian Creek WWTP Upgrade WKD Project Number: CL

4 DOCUMENT ADDENDUM 1) The intent is for monitoring of the new UV system to match that of the existing UV system. Details shall be coordinated and verified with the Owner s plant staff. 2) In addition to matching existing UV system monitoring, Open/Closed Position of Channel Gates for each UV system shall be monitored. 3) It is anticipated that up to 60 discrete tags in the new UV system will be monitored by SCADA. 4) It is anticipated that up to 20 real tags in the new UV system will be monitored by SCADA. 3. ADD - Specification Section Supervisory Control and Data Acquisition (SCADA). 4. CLARIFICATION Specification Section Rotary Drum Thickener Pump Station. A. Paragraph 3.2B The requirement for factory testing of the complete pump station system shall include the pump station control panel, pumps, drives, discharge piping, valves and air release completely assembled in the enclosure. DRAWINGS 1. REPLACE DRAWING E1.2 WITH ATTACHED DRAWING E1.2 REVISED 5/21/15 Drawing E1.2 was revised to extend 120 V for SCADA RTU Expansion Cabinet(s). 2. REPLACE DRAWING E1.4 WITH ATTACHED DRAWING E1.4 REVISED 5/21/15 Drawing E1.4 was revised to extend 120 V to SCADA RTU Expansion Cabinet(s) and for modifications to existing UV system SCADA monitoring. 3. REPLACE DRAWING E1.6 WITH ATTACHED DRAWING E1.6 REVISED 5/21/15 Drawing E1.2 was revised to extend 120 V for SCADA RTU Expansion Cabinet(s). Lincoln County Addendum No. 1 Killian Creek WWTP Upgrade WKD Project Number: CL

5 DOCUMENT ADDENDUM GENERAL The mandatory pre-bid meeting was held on June 11, A copy of the attendees and meeting agenda is attached. Bids will be accepted only from companies represented at the prebid meeting and are registered plan holders. Related comments and clarifications from the meeting are as follows: 1. Time of completion The Contractor s construction activity at the plant site is to be limited to the last 180 days of the construction period. Access to the site during the initial 125 days will be permitted for preliminary mobilization, layout, measurements and field investigation activities not requiring the physical installation of equipment or disruption of any plant operations. 2. The rainfall record from the Mounty Holly 4 NE NOAA weather reporting station is to be utilized for the determination of the mean days of precipitation each month in accordance with the Supplementary Conditions. 3. Normal plant operational hours are 7 am to 5 pm, Monday to Friday. Contractor access to the site at other times must be coordinated in advance with the Owner. 4. The Contractor will be permitted to utilize office and rest room facilities in the Maintenance Building but will be responsible for installing a temporary security fence for protection of the Owner equipment stored in the building and maintaining cleanliness of the facility utilized by the Contractor. 5. Work related to the piping modifications in the Sludge Holding Tank is to be performed prior to the work within Digester #1 and #2 to provide process flexibility during the work at the digesters. 6. Work within the Post Equalization Basin is to be performed after installation of the new effluent filter and is to be scheduled between midnight and 8 am unless other temporary provisions are made for the temporary transfer of decant flow during the work. Lincoln County Addendum No. 1 Killian Creek WWTP Upgrade WKD Project Number: CL

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7 SECTION SUPERVISORY CONTROL AND DATA ACQUISITION (SCADA) PART 1 GENERAL 1.1 RELATED DOCUMENTS A. The Drawings and provisions of the General Conditions, Special Conditions, and the Sections included under General Requirements are included as part of this Section as though bound herein. 1.2 WORK INCLUDED A. This section gives the requirements for SCADA system work on the Lincoln County SCADA system. B. Completeness: These specifications cover the intended function of the equipment, but do not necessarily cover all details necessary for a complete, operating and functional system. Contractor shall supply all devices and appurtenances necessary to provide a complete, operable and satisfactory system as indicated or specified. 1.3 ABBREVIATIONS AI AO DI DO I/O RTU SBR SCADA UI Analog Input Analog Output Digital Input Digital Output Input/Output Remote Terminal Unit Sequenced Batch Reactor Supervisory Control and Data Acquisition Universal Input 1.4 SUBMITTALS A. Pre-Construction: Shop drawings and product data for component installation to upgrade the existing RTUs to accommodate the additional I/O required for this project. B. Post-Construction: Submit to the Owner, CD copies of software for the SCADA system. One copy of the software shall be of the base software control system. Two copies shall be provided with all programmed variables, parameters, and functions of the SCADA system. 1.5 CERTIFICATIONS A. Equipment and components shall be 3 rd part listed; UL, ETL, CSA, etc. 1.6 WARRANTY / GUARANTEE A. The Integrator shall provide a 1-year warranty for all installed equipment stating that it is free from defects in workmanship and material. B. It is the intent of these specifications that the integrator shall furnish a complete, integrated, functionally operating system. Integrator shall warrant that the system performs the intended functions. PART 2 PRODUCTS Killian Creek WWTP Upgrades SCADA WKD Project Number CL

8 2.1 SCADA SYSTEM COMPONENTS A. The components of Lincoln County's existing SCADA System at Killian Creek Wastewater Treatment Plant include four RTUs designated SCADA Base RTU, RTU1, RTU2, and RTU3. B. The existing remote terminal units (RTU) utilize the following components for inputs and outputs. 1. Dorsett MicroScan4 Universal Controllers Part No. MS4-UNV. 2. Dorsett MicroScan4 Digital Controllers Part No. MS4-DIG. C. The Owner s integrator for SCADA system work is: Dorsett Technologies, Inc. 100 Woodlyn Drive Yadkinville, NC Phone: Fax: Contact: David W. Hutchens D. Replacement or upgrades to RTUs required to accommodate additional I/O for this project shall be determined by the Owner s SCADA integrator. Components not requiring replacement shall be re-used with the existing RTUs. E. Modifications shall be compatible with and interface seamlessly with the existing Lincoln County SCADA System. 2.2 RTU MODIFICATIONS A. Modifications for RTUs are quantified below based on information available for existing and proposed I/O quantities. Existing I/O availability shall be verified in the field. Proposed I/O shall be verified with what is indicated in the project drawings. B. SCADA BASE RTU (Lab Building): 1. No additional hardwired I/O connections are anticipated to this RTU. 2. This RTU is connected via a digital communications link to the plant SBR Control Panel to monitor status of the SBR system equipment and components. SCADA programming will be required for modifications to the SBR system as part of this upgrade project. 3. Control system programming shall be performed to provide system monitoring and control functions and modifications. Specific revisions to be incorporated associated with the SBR system are indicated on Instrumentation and Control Schedules in the project drawings. C. RTU1 (Blower Building): 1. Record documents show the following I/O availability: a. DI: 0. b. DO: 8. c. UI: 8. d. AO: This plant expansion project requires the following I/O points: a. DI: 17. b. AI: 1. Killian Creek WWTP Upgrades SCADA WKD Project Number CL

9 3. To accommodate the additional inputs, it is anticipated that installation of an expansion cabinet associated with the RTU is necessary. D. RTU2 (Dewatering Building): 1. Record documents show the following I/O availability: a. DI: 16. b. DO: 66. c. UI: 15. d. AO: This plant expansion project requires the following I/O points: a. DI: 36. b. DO: To accommodate the additional inputs, it is anticipated that installation of an expansion cabinet or multiple expansion cabinets associated with the RTU is necessary. E. RTU3 (Filter / UV Building): 2.3 WIRING 1. Record documents show the following I/O availability: a. DI: 10. b. DO: 72. c. UI: 6. d. AO: This plant expansion project requires the following I/O points: a. DI: 44. b. AI: To accommodate the additional inputs, it is anticipated that installation of an expansion cabinet or multiple expansion cabinets associated with the RTU is necessary. 4. Modifications to the existing UV system have been made to eliminate hardwired monitoring of the UV system via SCADA RTU3. Modifications include the addition of a Modbus TCP communications link between the UV system and SCADA RTU3. This Modbus TCP communications link will accommodate monitoring of the new UV channel equipment to be installed as part of this project. The UV vendor will provide I/O mapping information for coordination with the SCADA integrator to accommodate SCADA monitoring of the UV system status. a. It is anticipated that up to 60 discrete tags in the UV system will be monitored by SCADA. b. It is anticipated that up to 20 real tags in the UV system will be monitored by SCADA. A. All internal instrument and component device wiring shall be as normally furnished by the manufacturer. With exception of electronic circuits, all interconnecting wiring and wiring to terminals for external connection shall be no less than 18 AWG copper, insulated for not less than 600 volts, with a moisture and heat resistant material and flame retardant nonmetallic covering. B. All wires are to be identified with permanent wire number markers at each termination point of the wire. Acceptable NEC and ISA wire colors for various voltage conductors are to be used. C. Terminal blocks for field connections shall be suitable for No. 12 AWG wire and be complete with marking strip and screw connectors. Terminals shall be labeled to agree with identifications shown on supplier's submittal drawings. A terminal shall be provided for each conductor of external circuits plus one ground for each shielded cable. All wiring shall be grouped or cabled and firmly supported to the panel. Not less than 8 inches of clearance shall Killian Creek WWTP Upgrades SCADA WKD Project Number CL

10 be provided between the terminal strips and the base of vertical panels for conduit and wiring space. No less than 25% spare terminals shall be provided. Each control loop or system shall be individually fused and all fuses or circuit breakers shall be clearly labeled and located for easy maintenance. 2.4 DEVICE IDENTIFICATION A. All devices shall be permanently identified. The device and terminal identifications shall agree with those shown on the equipment drawings. B. Nameplates shall be provided on the face of individual devices. PART 3 EXECUTION 3.1 SUBMITTALS A. Submit to the Owner, CD copies of software for the SCADA system. One copy of the software shall be of the base software control system. Two copies shall be provided with all programmed variables, parameters, and functions of the SCADA system. 3.2 INSTALLATION A. General: The Contractor shall receive, handle and store all equipment and materials to be installed, being careful to prevent any damage during transport and storage. All equipment stored shall be protected from weather in a manner recommended by the manufacturer. 1. All equipment shall be handled and installed in accordance with written instructions and approved shop drawing details of the manufacturer and as required by the drawings. 2. If the Contractor determines that existing conditions do not permit proper installation, he shall immediately notify the Owner s Representative. B. Maintain existing programming for wastewater treatment plant monitoring and control functions that are not to be modified as part of this project. C. Control system programming shall be performed to provide system monitoring and control functions and modifications. Specific revisions to be incorporated are indicated on Instrumentation and Control Schedules in the project drawings. 3.3 START-UP TESTING A. Test system for proper function. 3.4 WITNESS TESTING A. The OWNER, ENGINEER, regular operators, and the maintenance staff shall be notified 1 week in advance of the times and dates of site tests. Tests shall be performed that fully exhibit the control and monitoring functions as specified herein. 3.5 SUPERVISION, START-UP, SERVICE, AND TRAINING A. Integrator's trained service engineer/technician shall provide installation supervision to the Contractor. B. Integrator's trained service engineer/technician shall provide initial startup, calibration and adjustment of equipment. Killian Creek WWTP Upgrades SCADA WKD Project Number CL

11 C. Integrator shall, during the warranty period, furnish all service necessary to repair defective equipment or work, and no charges will be made for any service due to these reasons. A complete written report shall be furnished to the Owner and Engineer after each service visit, giving the reason for failure and recommendations to prevent recurrence. D. Conditional service shall also be provided, upon request of the Owner, for a period of one year after final acceptance, up to two 8-hour days, on-site. E. Maintenance Training: At start-up, the integrator shall provide eight (8) hours of maintenance training for the owner s personnel. END OF SECTION Killian Creek WWTP Upgrades SCADA WKD Project Number CL

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13 COPYRIGHT, W.K. DICKSON & CO., INC. ALL RIGHTS RESERVED. REPRODUCTION OR USE OF THE CONTENTS OF THIS DOCUMENT; ADDITIONS OR DELETIONS TO THIS DOCUMENT, IN WHOLE OR IN PART, WITHOUT WRITTEN CONSENT OF W.K. DICKSON & CO., INC., IS PROHIBITED. ONLY COPIES FROM THE ORIGINAL OF THIS DOCUMENT, MARKED WITH AN ORIGINAL SIGNATURE AND SEAL SHALL BE CONSIDERED TO BE VALID, TRUE COPIES. CONSULTING ENGINEERS 3412 ENTERPRISE DRIVE (910) NC LICENSE #: C-1073 community infrastructure consultants 616 COLONNADE DRIVE CHARLOTTE, NC (t) (f) NC LICENSE NO.F-0374 PROFESSIONAL SEAL AIR INTAKE NEW BLOWER NO. 8 DIGESTER NEW BLOWER NO. 4 SBR AIR INTAKE REVISION RECORD 1 05/21/15 MAC DESCRIPTION BY DATE NO. FILE PATH:F:\1468 Killian Creek WWTP Expansion\DWG\1468 E1.2 BLOWER.dwgF:\1468 Killian Creek WWTP Expansion\DWG\1468 E1.2 BLOWER.dwg, MARK, 5/21/2015 4:25:55 PM BID DOCUMENT - DO NOT USE FOR CONSTRUCTION PROJECT NAME: KILLIAN CREEK WWTP UPGRADES WKD PROJ. NO.: DRAWING TITLE: PROJ. MGR.: BF DESIGN BY: MAC DRAWN BY: FM PROJ. DATE: DEC DRAWING NUMBER: E1.2 ELECTRICAL BLOWER BUILDING CL

14 COPYRIGHT, W.K. DICKSON & CO., INC. ALL RIGHTS RESERVED. REPRODUCTION OR USE OF THE CONTENTS OF THIS DOCUMENT; ADDITIONS OR DELETIONS TO THIS DOCUMENT, IN WHOLE OR IN PART, WITHOUT WRITTEN CONSENT OF W.K. DICKSON & CO., INC., IS PROHIBITED. ONLY COPIES FROM THE ORIGINAL OF THIS DOCUMENT, MARKED WITH AN ORIGINAL SIGNATURE AND SEAL SHALL BE CONSIDERED TO BE VALID, TRUE COPIES. CONSULTING ENGINEERS 3412 ENTERPRISE DRIVE (910) NC LICENSE #: C-1073 community infrastructure consultants 616 COLONNADE DRIVE CHARLOTTE, NC (t) (f) NC LICENSE NO.F-0374 PROFESSIONAL SEAL REVISION RECORD DATE DESCRIPTION BY FILE PATH:F:\1468 Killian Creek WWTP Expansion\DWG\1468 E1.4 EFFLUENT-UV.dwgF:\1468 Killian Creek WWTP Expansion\DWG\1468 E1.4 EFFLUENT-UV.dwg, MARK, 5/21/2015 4:25:17 PM 1 05/21/15 MAC NO. BID DOCUMENT - DO NOT USE FOR CONSTRUCTION PROJECT NAME: KILLIAN CREEK WWTP UPGRADES WKD PROJ. NO.: DRAWING TITLE: PROJ. MGR.: BF DESIGN BY: MAC DRAWN BY: FM PROJ. DATE: DEC DRAWING NUMBER: E1.4 ELECTRICAL EFFLUENT / UV BUILDING CL

15 COPYRIGHT, W.K. DICKSON & CO., INC. ALL RIGHTS RESERVED. REPRODUCTION OR USE OF THE CONTENTS OF THIS DOCUMENT; ADDITIONS OR DELETIONS TO THIS DOCUMENT, IN WHOLE OR IN PART, WITHOUT WRITTEN CONSENT OF W.K. DICKSON & CO., INC., IS PROHIBITED. ONLY COPIES FROM THE ORIGINAL OF THIS DOCUMENT, MARKED WITH AN ORIGINAL SIGNATURE AND SEAL SHALL BE CONSIDERED TO BE VALID, TRUE COPIES. CONSULTING ENGINEERS 3412 ENTERPRISE DRIVE (910) NC LICENSE #: C-1073 community infrastructure consultants 616 COLONNADE DRIVE CHARLOTTE, NC (t) (f) NC LICENSE NO.F-0374 PROFESSIONAL SEAL REVISION RECORD 1 05/21/15 MAC NO. FILE PATH:F:\1468 Killian Creek WWTP Expansion\DWG\1468 E1.6 SLUDGE DEWATER.dwgF:\1468 Killian Creek WWTP Expansion\DWG\1468 E1.6 SLUDGE DEWATER.dwg, MARK, 5/21/2015 4:26:27 PM BID DOCUMENT - DO NOT USE FOR CONSTRUCTION DATE DESCRIPTION BY PROJECT NAME: KILLIAN CREEK WWTP UPGRADES PROJ. MGR.: BF DESIGN BY: MAC DRAWN BY: FM PROJ. DATE: DEC DRAWING NUMBER: WKD PROJ. NO.: DRAWING TITLE: E1.6 ELECTRICAL SLUDGE DEWATERING CL

16 MEETING AGENDA KILLIAN CREEK WWTP UPGRADE PRE-BID MEETING JUNE 11, Attendance Sign-in [Official Record for Approved Bidders] 2. Overview of project scope 3. Review of Bid Form a. Bib Date June 25, 2:00 PM, 3 rd Floor, Citizens Center in Lincolnton, NC. b. Lump Sum Bid c. Owner Additive Bid Items d. Bid Attachments i. Schedule of Subcontractors ii. Bid Security iii. NC Affidavit A Listing of Good Faith Efforts iv. NC Affidavit B Intent to Perform Contract with Own Workforce (If Applicable) 4. Time of Completion a. 305 calendar days (125 equipment purchase/shop drawing review and approval with site work limited to 180 days) b. Liquidated damages - $1,250/day from project completion date. c. Abnormal weather determination (General Conditions Paragraph 4.05 C-2 amended by Supplemental Conditions) 5. Contractor s Use of Site and Premises a. The Contractor will be allowed access to the site during operational hours (7:00 am to 5:00 pm) corresponding to the wastewater treatment plant operation or prior scheduled with the Owner. b. All work associated with the renovations shall be performed in a manner such that there will be no impact to the existing wastewater treatment operations or performance. c. All work requiring utility outages of shutdown will be limited and must be scheduled with the Owner in advance. d. The initial contract period is to be utilized for shop drawing submittals and approvals and other non-site related work and the field construction work at the Killian Creek WWTP site to be limited to the contract period noted in the Agreement. e. Erosion control requirements (Reference Drawing C.3). f. Designated Contractor Office/Restroom Area (Reference Spec # ). The Contractor shall be responsible for maintaining cleanliness and security of 1

17 Owner materials and equipment stored within the building and shall be responsible for any thief or vandalism directly associated from lack of security. g. Designated Contractor Parking and Storage Area. 6. Special Work Sequence Requirements a. Aerobic digester piping revision area i. Schedule early in project to permit process flexibility for installation of RDT pump suctions in digesters. ii. Coordinate schedule with operations to get SHT and Digester(s) levels lowered. iii. Work to be performed with sludge at lower level in tank. b. Post equalization basin area i. Work to be scheduled after installation /startup of third effluent filter. ii. Plant operations to coordinate preliminary drainage of tank to removed bottom solids accumulation prior to work. iii. Work to be scheduled between 12 midnight and 8 am. 7. Proposed Site Tour Areas a. Designated contractor office/restroom area b. Blower building c. New rotary drum thickener area d. SBR retrievable aeration assemblies e. Aerobic digester piping revision area f. Post equalization basin area g. Effluent filter building (effluent filter, UV equipment and effluent reuse system) h. Sludge pump area i. Rotary sludge press area. 8. Final wrap-up* * It is requested that specific questions be submitted in writing to bfroneberger@wkdickson.com no later than June 19, 2015 to permit response to all plan holders in the form of an Addendum. 2

18 PROJECT OVERVIEW The Project consists of supplying, installation, startup and related work of the following equipment systems at the existing wastewater treatment plant as a lump sum bid: 1. Ten (10) retrievable aeration diffuser racks in existing Sequencing Batch Reactor Basins (SBR); 2. Two (2) positive displacement blowers for SBR and Aerobic Digesters; 3. Two (2) submersible pumps in Post Equalization Basin; 4. One (1) effluent disc filter; 5. One (1) ultraviolet disinfection system with two (2) banks; 6. One (1) rotary lobe sludge transfer pump; 7. One (1) rotary filter press system with associated modifications to the existing dewatered solids conveyor system permitting distribution to two dumpsters. 8. Two (2) polymer systems rotary drum sludge press and rotary drum thickener) 9. SCADA The following equipment and related work are to be bid as Owner Additive Alternative Bid Items : A. One (1) new rotary drum thickener system including sludge transfer pumps, polymer system, precast concrete building and associated interconnecting piping. B. Modifications to dewatered sludge distribution conveyor to permit feeding of dewatered solids to two dumpsters. C. Addition of four (4) submersible mixers and associated controls at the post equalization basin. D. New plant effluent reuse water system including supply pumps, reuse water storage tank, package booster pump system, hypochlorite feed system, chemical drum storage pallet, basket strainer and associated distribution piping. E. Electrical modifications to add start/stop control of sludge transfer pumps in Digester #2 and Sludge Holding tank at the sludge truck loading station. F. Modifications to the truck loading station to improve flexibility of hose and ease of handling. G. RAS piping revisions and valve additions to permit transfer of from Digester No. 2 back to Digester 1. H. Grating modifications at effluent weir to provide better sampling access. 3

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