SUBJECT: ADDENDUM No. 1 FILE: Finished Water Pump Station Electrification Phase 2 WT7074

Transcription

1 Water Division 202 Fleming Hill Road Vallejo CA April 4, 2017 TO: Prospective Bidders SUBJECT: ADDENDUM No. 1 FILE: Finished Water Pump Station Electrification Phase 2 WT7074 The following are changes to the contract specifications and plans for the above referenced project: This addendum is hereby made a part of the contract documents to the same extent as if they were originally included therein. Receipt of this addendum shall be acknowledged with the bid for FINISHED WATER PUMP STATION ELECTRIFICATION PHASE 2 WT7074. SPECIFICATIONS: 1. Reference Section D: Technical Specifications Section , paragraph 1.02.C.1; Delete ready for service date of January 1, 2017 and insert January 1, Reference Section D: Technical Specifications Section , paragraph 1.07.A; The City would like the list of submittals within 7 calendar days of the NTP. Delete 30 calendar days and insert 7 calendar days. 3. Reference Section D: Technical Specifications Section , paragraph 1.07; Add paragraph C as follows: C. Contractor shall prioritize submittals for equipment with long lead times so that the critical path is minimized. 4. Reference Section D: Technical Specifications Section ; Remove Section and replace with the attached pages for Section Finished Water Pump Station Electrification Phase 2 WT7074 Addendum #1

2 Water Division 202 Fleming Hill Road Vallejo CA PLANS: 5. Reference Plan Sheet: D01, Key Note 2; Delete Key Note 2 and replace with the following: Demolish exhaust piping, hangers, exhaust pipe supports, and mufflers for all engines. Roof penetrations shall remain, however, the openings shall be capped with minimum 12 gauge aluminum, fabricated to fit securely over the penetration and secured with aluminum straps. The penetration shall be watertight. 6. Reference Plan Sheet: D01, Key Note 3; Delete Key Note 3 and replace with the following: Demolish associated exhaust muffler and supports outside the pump station. Repair the penetration with #4 rebars centered in the wall, each way, doweled into the existing wall (4 embed), spaced 6 inches apart. Patch with non-shrink grout per manufacturers recommendations. 7. Reference Plan Sheet: C11, Detail 1; The detail reference to the new concrete pad is incorrect. Delete S245 and Insert S Reference Plan Sheet: C20, Detail 18; Add Note 2 as follows: 2. Shutdown of Existing 24 PW will relieve pressure in the line, but the line will not be able to be drained before tapping. Provide dewatering of excavation. 9. See attached Addendum Number 1: Q & A for project clarifications. Finished Water Pump Station Electrification Phase 2 WT7074 Addendum #1

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4 SECTION TESTING PRESSURE PIPING PART 1 - GENERAL 1.01 SECTION INCLUDES A. Hydrostatic pressure pipeline testing REFERENCED SECTIONS A. The following Sections are referenced in this Section: 1.03 SUBMITTALS 1. Section Submittals A. Provide Submittal per Section B. Testing Schedule and Notification of Testing: Submit advance written notice of testing activities a minimum of 48 hours prior to conducting piping tests. C. Testing Plan: Submit a written plan that identifies the methods for water procurement, conveyance and disposal. D. Completed Pipe Test Record Forms, found at the end of this Section TESTING REQUIREMENTS A. Furnish personnel, materials, bulkheads, test plugs, restraints, anchors, temporary connections, pumps, pressure gauges and other equipment needed to perform testing. B. Water for Testing 1. Use potable water for pressure testing pipelines. 2. Disposal: a. Dispose of water used for testing pipelines in the plant underdrainage system. C. Test only those portions of the pipe that have been installed as part of this Contract. 1. Test new pipe sections prior to making final connection to existing piping. 2. Install test plugs or bulkheads to isolate new piping systems. 3. Unless otherwise indicated, valves may not be used to isolate portions of the piping system for purposes of testing. When testing against a valve is indicated or approved by the Owner, provide a test plate pancake to further isolate the new and existing piping. West Yost April Finished Water Pump Station

5 D. Sequence 1. Buried Pressure Piping: Except as otherwise indicated, conduct piping pressure test after trench has been backfilled to subgrade and compacted. Piping may be tested before or after final paving, at Contractor s option. 2. Encased Piping: Test before encasing pipe in concrete. E. Failed Tests: Make necessary corrections or remove defective pipe or defective appurtenances. Repeat pressure test until a successful test is achieved. PART 2 - PRODUCTS (NOT USED) PART 3 - EXECUTION 3.01 GENERAL A. Test pipelines, appurtenances, valves and fittings in the pipeline system. B. Where allowable leakage rates are not specifically indicated, no leakage is allowed. C. Perform testing operations in the presence of the Engineer. D. Prior to pressure testing, clean pipeline of debris, construction materials, dirt and other foreign material within the piping system. E. Do not test pipelines until thrust restraint devices have been installed. Where concrete thrust blocks are used, do not begin pressure test until concrete has attained an age of at least 7 days unless otherwise approved by the Owner. F. After testing has been completed, drain test water from pipelines and leave in clean condition FILLING PIPING SYSTEMS WITH WATER A. Place temporary bulkheads in the pipe at the ends of the test section, and then slowly fill the pipeline with water at a rate which does not cause surges or exceed the rate at which the air can be released through the air valves. B. Ascertain that test bulkheads are suitably restrained to resist the thrust of the test pressure without damage to, or movement of, the adjacent pipe. C. Purge air within the pipeline during the filling operation. Check proper operation of air release valves and air vents during the filling operation to ascertain proper operation and venting of air from the pipeline. D. Concrete pipe, cement-mortar lined pipe and other pipe made from water absorbing material: 1. After the filling operation is complete, allow the filled pipeline to stand under a slight pressure for at least 24 hours to allow air to escape from any air pockets within the pipeline and the pipe lining to absorb water. 2. Examine bulkheads, valves and connections for leaks during this period. If leaks are found, make corrections before conducting the pressure test. West Yost April Finished Water Pump Station

6 3.03 PRESSURE TESTING EXPOSED PIPING A. Test exposed piping as follows: 1. Fill section of piping under test with water and raise the system pressure to 150 psi or the test pressure specified in the Drawings. 2. Visually inspect exposed pipe joints, joints at fittings, valves, hydrants, and other piping appurtenances for leaks. 3. Correct leakage as necessary to eliminate the leakage. 4. Duration of Pressure Test: 2 hours. 5. Leakage Allowances: Zero leakage. 6. Correct any visible leakage by tightening flanges and screwed joints, replacing gaskets or removing defective materials. 7. Repeat test until no leakage is observed. 8. Record results of pressure test on Pipe Test Record form, included at the end of this Section PRESSURE TESTING BURIED PIPING A. Fill section of piping under test with water and raise the system pressure to 150 psi or the test pressure specified on the Drawings. B. Visually inspect exposed pipe joints, joints at fittings, valves, hydrants, and other piping appurtenances for leaks. C. Correct visible leaks necessary to eliminate the leakage. D. Duration of Pressure Test: 2 hours. E. Leakage Allowance: Zero leakage F. Correct any visible leakage by tightening flanges and screwed joints, replacing gaskets or removing defective materials. G. Repeat test until no leakage is observed. H. Record results of pressure test on Pipe Test Record form included at the end of this Section WELD TESTING A. Field welds will be inspected by magnetic particle methods per ASTM E709 and ASTM E1444. Field butt welds will be inspected in accordance with the requirements of API 1104 by the radiographic method and the acceptance criteria of API B. Inform the City s Representative before completed weld joints are backfilled so that the joint may be inspected. The Contractor shall assume all cost of exposing backfilled joints for inspection when backfilling preceded the inspection. West Yost April Finished Water Pump Station

7 C. Personnel performing visual inspection of welds shall be qualified and currently certified as Certified Welding Inspections in accordance with AWS QC1, Standard for Qualification and Certification of Welding Inspections. Personnel performing nondestructive tests shall be qualified and certified to the requirements of SNT-TC-1A. D. The City may also order nondestructive testing by an independent testing laboratory in addition to any testing specified herein. Except as otherwise specified herein, all costs for the independent testing laboratory to inspect and test field welds will be paid for by the City. If the weld is defective, the inspection costs shall be paid for by the Contractor. Defective welds shall be repaired and retested at the Contractors expense. E. Submit test reports of all laboratory tests per Section F. Weld testing and inspection described herein shall be performed by the Contractor at no additional cost to the City. END OF SECTION West Yost April Finished Water Pump Station

8 PIPE TEST RECORD Date: Project Name: Contractor: Project No.: Pipeline Size & Name Pipe Type Pipe Location/Description From: To: (SL), SN, IA, etc.) (DI, PVC, Steel, Copper, etc.) (Attach sketch if needed) Section Tested: First Test Or Re-Test Length of Pipe Tested: Ft. Test Specifications Type of Test: Type of Test: Duration: Allowable loss: Actual Test Results Start pressure: End Pressure: Start time Stop time Duration Actual loss: Comments: Test Passes Test Fails Tested By: Test Witnessed By: Contractor Construction Inspector West Yost April Finished Water Pump Station

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10 ADDENDUM NUMBER 1: Q & A to the Finished Water Pump Station Electrification, Phase 2, Project No. WT 7074 April 4, Q: What are the requirements for salvaged equipment? A: See Section , paragraph The gas engines and pumps in the FWPS building shall be salvaged. Crate the equipment on pallets and move outside the building. The City will move the crated equipment to their storage location. 2. Q: Are the taps for the Grid piping Air/Vac Vault (Detail 18/C20) true hot taps? A: The City can shut down the existing lines (one at a time), however the lines cannot be drained. Expect about 400 linear feet of 24 diameter pipeline full of water (but not under pressure), to be drained into the excavation. 3. Q: Is there parking for employees on site? A: In addition to the staging area shown on the plans, there is space for employee parking near the standby generator building. About 10 cars/trucks could be accommodated. 4. Q: What is the traffic control for? A: Traffic Control requirements are intended for the possibility that Contractors need to use the secondary gate and driveway on Tuolumne St. The gate on Tuolumne is to be used only for special deliveries that cannot easily negotiate the tight corners and steep driveway at the main gate. Coordination with the City is required to use the gate on Tuolumne. 5. Q: What is the hazardous waste on the project? A: Refer to Section And attached LBP (lead-based paint) report. Finished Water Pump Station Electrification Phase 2 WT7074 Addendum #1

11 EMSL Analytical, Inc 464 McCormick Street, San Leandro, CA Phone/Fax: (510) / (510) sanleandrolab@emsl.com EMSL Order: CustomerID: CustomerPO: ProjectID: ATC60 Attn: Project: Paul Lowe ATC Group Services LLC 2400 Camino Ramon Suite 360 San Ramon, CA WATER TREATMENT PLANT Phone: (925) Fax: (925) Received: 11/04/16 11:30 AM Collected: 11/4/2016 Test Report: Lead in Paint Chips by Flame AAS (SW B/7000B)* Lead Client Sample Description Lab ID Collected Analyzed Concentration L /4/ /4/ % wt Site: BLACK/GREY ENGINE BLOCK L /4/ /4/2016 <0.010 % wt Site: WHITE PROPANE TANK - EXTERIOR L /4/ /4/2016 <0.010 % wt Site: WHITE PROPANE TANK - EXTERIOR L /4/ /4/ % wt Site: SILVER PUMP, NORTH L /4/ /4/ % wt Site: 12" O.D. GREEN PIPE NORTH L /4/ /4/2016 <0.010 % wt Site: RED HEAT EXCHANGER L /4/ /4/ % wt Site: TAN ENGINE BLOCK SOUTH L /4/ /4/2016 <0.010 % wt Site: 12" O.D. BLUE PIPE SOUTH Chris Dojlidko, Laboratory Manager or other approved signatory *Analysis following Lead in Paint by EMSL SOP/Determination of Environmental Lead by FLAA. Reporting limit is % wt based on the minimum sample weight per our SOP. Unless noted, results in this report are not blank corrected. This report relates only to the samples reported above and may not be reproduced, except in full, without written approval by EMSL. EMSL bears no responsibility for sample collection activities. Samples received in good condition unless otherwise noted. "<" (less than) result signifies that the analyte was not detected at or above the reporting limit. Measurement of uncertainty is available upon request. The QC data associated with the sample results included in this report meet the recovery and precision requirements unless specifically indicated otherwise. Definitions of modifications are available upon request. Samples analyzed by EMSL Analytical, Inc San Leandro, CA A2LA Accredited Environmental Testing Cert # Initial report from 11/04/ :03:30 Test Report ChmSnglePrm/nQC Printed: 11/4/2016 2:03:30 PM Page 1 of 1