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Viewing inquiries for 11-422114
Submit new inquiry for this projectInquiry #1: Sheet C-6 shows 4x4 WWF, however sheet Q-1 calls out 6x6 WWF. Please clarify.
Inquiry submitted 08/29/2019
Response #1:Submitted for consideration.
Response posted 08/29/2019
Response #2:Please refer to Addendum No. 1, dated September 17, 2019.
Response posted 09/17/2019
Inquiry #2: Reference sheet C-6. The table shows 120 degree limits of rust for pipe sizes 108" and smaller. With an additional 30 degrees on both sides for concrete per the invert paving detail, the concrete must be placed to the pipe's spring line. Is this the intent?
Inquiry submitted 08/29/2019
Response #1:Submitted for consideration.
Response posted 08/29/2019
Response #2:Yes. Please bid per the current contract documents.
Response posted 09/04/2019
Inquiry #3: Sheet C-6 note 4 calls for the removal of rust flakes in the pipe invert by sandblasting or pressure washing. Section 71-3.04C requires sandblasting of the invert to remove all coatings to base steel. Which requirement is desired?
Inquiry submitted 09/09/2019
Response #1:Submitted for consideration.
Response posted 09/10/2019
Response #2:Please refer to Section 5-1.02 of the Standard Specifications for the governing ranking of the project plans and standard specifications.
Reminder: This project has a Mandatory Pre-bid Job Site Visit on September 11.
Response posted 09/10/2019
Inquiry #4: Per the Special Provisions 2-1.08 there was a mandatory pre-bid meeting that was held on 9/11. Due to the fact that the mandatory pre-bid meeting was not advertised like it typically is on all Caltrans bids it was not attend by some prime and subcontractors. In all other previous instances Caltrans lists "This project has a mandatory pre-bid meeting" in BOLD font on the All Projects Currently Advertised web page, however for this project it was not advertised that way (reference currently advertised projects that display this requirement 02-1H1104, 03-3F5104, 08-1C38U4, 12-0K0214). Additionally, the Notice to Bidders (Page 1) of the SP's did not specify there was a mandatory pre-bid meeting in this overall contract summary/requirement page which is where this requirement is specified on all other contracts. The only way to see this requirement would be to do a complete specification review multiple weeks before the bid, which is not standard practice of contractors and subcontractors on a job of this size
By not specifying the mandatory pre-bid requirement in the fashion that Caltrans typically does, and is doing on all other current advertisements, has caused some prime and subcontractors to be excluded from bidding the project by missing the pre-bid meeting. Please consider issuing an addendum and holding another mandatory pre-bid meeting in order to allow additional contractors and subcontractors to bid the project and obtain the most competitive pricing possible on this project.
Inquiry submitted 09/13/2019
Response #1:Submitted for consideration.
Response posted 09/13/2019
Response #2:An addendum is coming to have a second mandatory pre bid job site visit on Thursday, September 19th, 2019.
Response posted 09/16/2019
Inquiry #5: Potable water is utilized to clean the existing culvert structures prior to rehabilitation by either CIPP or invert paving. Debris from the cleaning process will be removed from the site. Is capture and disposal of the water used for cleaning a requirement or may the water be released into the drainage system?
Inquiry submitted 09/16/2019
Response #1:Submitted for consideration.
Response posted 09/16/2019
Response #2:Please comply with:
1. Construction General Permit.
2. California State Water Board Resources Control Board Permit number 2012-0011-DWQ (as amended).
3. Section 13 of the Standard Specifications.
Response posted 09/17/2019
Inquiry #6: Special Provisions 71-3.08A(3) ¶ 8.4 “If not described otherwise, assume the groundwater level is at ½ the culvert depth.†Question: Does “½ the culver depth†refer to ½ of the diameter of the culvert pipe (assume two feet of water for a 48-inch diameter pipe) or does it refer to ½ of the depth from the top of ground to pipe invert?
Inquiry submitted 09/16/2019
Response #1:Submitted for consideration.
Response posted 09/16/2019
Response #2:Assume groundwater depth is at springline of the pipe.
Response posted 09/17/2019
Inquiry #7: Special Provision 71-3.08B(1) General includes the following table: CIPP wall thickness, Culvert No's. 1, 7, 10, 12 = min wall thickness 0.3 inch & Culvert No's. 2, 4, 6, 9, 13 = min wall thickness 0.7 inch.
The minimum thickness shown appear to be based on calculations based on the minimum strength of materials for heat cured resin systems specified in 71-3.08A(4)b.
ASTM-F1216 allows for wall thickness design based on the greater strength of materials furnished as evidenced by testing (as specified).
Question: May we furnish finished CIPP products, heat cured, or UV cured, that meet ASTM F-1216 design standards based on the actual, tested strength of materials used that are less than the minimum wall thickness stated as is a common engineering practice? If so, please remove the minimum wall thickness table and replace with verbiage allowing for the minimum, finished wall thickness of CIPP based on ASTM F-1216 calculations (as currently stated) using actual strength of materials from site produced samples with a minimum not less than the stated properties.
Current heat cured CIPP material properties are higher than the minimum included in the specification and current UV CIPP material properties are significantly higher. The advantage of the higher strength materials is an increased cross-sectional area and greater flow capacity of the completed pipe.
Inquiry submitted 09/16/2019
Response #1:Submitted for consideration.
Response posted 09/16/2019
Response #2:The minimum thickness shown shall be per the Special Provisions, Section 71-3.08B(1). Please bid per the current contract documents.
Response posted 09/17/2019
Inquiry #8: With the additional mandatory pre-bid being held September 19, can the bid date be postponed a week or two?
Inquiry submitted 09/18/2019
Response #1:Submitted for consideration.
Response posted 09/18/2019
Response #2:No. Please bid per the current contract documents.
Response posted 09/18/2019
Inquiry #9: There are 2 conflicting CIPP design calculations specified in the contract documents:
71-3.08A(3) Submittals
8. CIPP design calculations for each culvert location. Include the drainage system number shown for the corresponding culvert and the liner thickness. Design parameters include:
8.1. CIPP classification. Unless otherwise shown, classification must be Type II (partially deteriorated) under ASTM D5813 and ASTM F1216, Appendix X1.1.1.
8.2. CIPP must be designed under ASTM F1216, Appendix X1.2.1.
8.3. Ovality must be assumed at 5 percent.
8.4. If not described otherwise, assume the groundwater level is at springline of the pipe (response to bidder inquiry changed this from 1/2 the culvert depth to at springline, making the liner even thinner).
8.5. Assume no bonding to the culvert wall.
vs.
71-3.08B Materials
71-3.08B(1) General
The minimum wall thickness for the CIPP is the minimum thickness shown in the authorized installation plan or shown on the following table, whichever is greater:
Culvert No 1,7,10,12 are to have a min wall thickness of 0.3 inch/7.62mm
Culvert No 2,4,6,9,13 are to have a min wall thickness of 0.7 inch/17.78mm
1. Are we classifying these pipes as Type II/partially deteriorated and designing liners based on Section 71-3.08A(3) Submittals or,
2. Using the minimum wall thickness in the authorized installation plan (where is this located?) or the table provided in Section 71-3.08B Materials?
As another inquiry stated, may we furnish finished CIPP products, heat or UV-cured, that meet ASTM F-1216 design standards based on the actual tested strength of materials used?
Inquiry submitted 09/19/2019
Response #1:Submitted for consideration.
Response posted 09/20/2019
Response #2:As stated in section 71-3.08B(1) - The minimum wall thickness for the CIPP is the minimum thickness shown in the authorized installation plan or shown on the table, whichever is greater.
Therefore, the contractor is to comply with section 71-3.08.
There is no conflict between the submittals and a required minimum thickness......
Response posted 09/20/2019
The information provided in the responses to bidder inquiries is not a waiver of Section 2-1.07, "JOB SITE AND DOCUMENT EXAMINATION" of the Standard Specifications or any other provision of the contract, nor to excuse the contractor from full compliance with the contract. Bidders are cautioned that subsequent responses or contract addenda may change a previous response.