Bidding Documents Question and Answer Board

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Contract Number: 14-113-5F  
Contract Description: STORMWATER RETROFITS FOR REAL TIME CONTROLS AND RAINWATER HARVESTING SYSTEM AT DEARBORN HOMES  

The District's responses to questions presented on this page are NOT binding to the bidding documents.

Any official interpretation or change to the bidding documents will be made only by an addendum
duly issued to all plan holders on record by the Director of Procurement and Materials Management








 
 

Subject12:  07 92 00 Waterproofing Storm Structure
Question: Is the existing StormTrap Detention Tank, as designed and installed, watertight? Is the intent of Specification Section 07 92 00 to make the storm structure watertight whether it was originally designed to be or not? Our previous experience and examination of StormTrap literature suggests that this is not possible. In addition, please specify a specific joint sealant system (manufacturer and product) and application procedure that the District feels will meet the requirement for waterproof joints and satisfy the warranty requirements in this spec section.
Date of Question: 1/22/2018 3:11:45 PM
 
         MWRDGC RESPONSE  1:   The existing StormTrap detention tank was originally designed and installed to be watertight, however, no performance requirement (ie. a maximum leakage rate) was imposed on the structure during its construction. During installation, the joints were specified to be less than ¾ inch in width and all joints were specified to be sealed. Per Section 07 9200, the StormTrap detention tank is to be cleaned and sanitized. After the tank has been cleaned, the joints are to be inspected. Through the inspection, the contractor shall identify and then repair joints to near original condition. Damaged joints that need repair may include joints with no visible sealant or missing joint sealant, joints with gaps due to shifting of structures or shrinkage of joint sealant, or damaged joint sealant. Section 07 9200 does not have a maximum leakage rate performance requirement. Section 07 9200 specifies polyurethane joint sealant complying with both ASTM C 920 and NSF 61 standards for this work.
        Date of Answer:   1/23/2018 1:21:30 PM

                     
                                                                                                 
 

 
 

Subject11:  Addm 2 Cost Proposal C
Question: Please clarify whether cleaning and sanitation of the Storm Trap Detention Tank is to be considered part of the lump sum price (Cost Proposal A) or part of "all associated work" in the Contingent Unit Price Work (Cost Proposal C)?
Date of Question: 1/22/2018 7:28:54 AM
 
         MWRDGC RESPONSE  1:   Per Sheet 12, Demolition Note 13 of the Contract Drawings, the StormTrap detention tank shall be cleaned, sanitized, and have its joints inspected for repair. The joint repairs shall be paid under the Contingent Unit Price Work (Cost Proposal C).
        Date of Answer:   1/22/2018 3:19:51 PM

                     
                                                                                                 
 

 
 

Subject10:  Sidewalk crossing C-105 & C-301/Spec 33 05 24
Question: For the 3" Irrigation Line sidewalk crossing just south of the Rainwater Harvesting Skid, will the contractor be allowed to utilize Horizontal Directional Drilling as shown in other locations (drawing C-105 and C-301 show this crossing as trenched; drawing C-201 shows every other crossing as HDD)?
Date of Question: 1/15/2018 11:26:39 AM
 
         MWRDGC RESPONSE  1:   Horizontal Directional Drilling will be allowed if the bidder would want to utilize it.
        Date of Answer:   1/16/2018 2:38:53 PM

                     
                                                                                                 
 

 
 

Subject9:  Water Main Tap
Question: Is the Water Main Tap - including the tap itself, gate valve, and valve structure - to be performed by the City of Chicago as it typically is within the city limits, or to be by the Contractor?
Date of Question: 1/15/2018 7:47:42 AM
 
         MWRDGC RESPONSE  1:   Per sheet 19 in the Contract Drawings, the Contractor shall provide a tapping sleeve onto the existing 8” ductile iron pipe water main. The Contractor shall also provide a water valve structure and 4” gate valve. The Contractor shall notify & coordinate this work with the Chicago Department of Water Management.
        Date of Answer:   1/22/2018 2:35:14 PM

                     
                                                                                                 
 

 
 

Subject8:  Refer DS 33 05 37 Sewer Structure Rehabilitation
Question: Per the requirements of this DS, the Contractor shall provide all labor, material and equipment required for rehabilitation of manholes from ground surface to sewer invert. Please clarify the limits of this work. Provide a list of structures to be rehabilitated under this DS.
Date of Question: 1/8/2018 5:51:36 PM
 
         MWRDGC RESPONSE  1:   No sewer structure rehabilitation is identified on the Contract Plans. The Contract Documents will be revised accordingly in Addendum #2.
        Date of Answer:   1/16/2018 2:38:24 PM

                     
                                                                                                 
 

 
 

Subject7:  Refer DS 07 92 00 Storm Structure Cleaning, Sanitation, and Joint Sealant Application
Question: Please provide as-built drawings for the existing Storm Structure for our use in determining quantities of surfaces to be clean & sanitized & for preparation & waterproofing of joints. Advise if permissible for bidding contractors to visit the site to inspect the structure either by entering the structure or visually inspecting through the access hatches.
Date of Question: 1/8/2018 5:50:46 PM
 
         MWRDGC RESPONSE  2:   An addendum will be issued to answer this question. Design drawings of the existing Storm Trap tank will be provided in addendum #2. Due to time and site constraints, it will not be permissible to visit the site for inspection of the Storm Trap structure.
        Date of Answer:   1/16/2018 2:42:06 PM
 
         MWRDGC RESPONSE  1:   Unit Price work under a cost proposal will be addressed in the Addendum #2 that will be issued soon. Any drawings that can be located will be included. [Replace with this:] An addendum will be issued to answer this question. Design drawings of the existing Storm Trap tank will be provided in addendum #2. Due to time and site constraints, it will not be permissible to visit the site for inspection of the Storm Trap structure.
        Date of Answer:   1/16/2018 2:37:52 PM

                     
                                                                                                 
 

 
 

Subject6:  Refer DS 03 01 30 Rehabilitation of Concrete
Question: Part 1.2 Describes the work to be performed under this DS as unit price work. Please clarify. If to be performed as unit price work provide required quantities for Repair Surface & Crack Repair along with locations.
Date of Question: 1/8/2018 5:50:01 PM
 
         MWRDGC RESPONSE  2:   No concrete rehabilitation work is identified on the Contract Plans. The Contract Documents will be revised accordingly in Addendum #2, that will be issued soon.
        Date of Answer:   1/16/2018 2:41:11 PM
 
         MWRDGC RESPONSE  1:   Unit Price work under a cost proposal will be addressed in the Addendum #2 that will be issued soon. [Replace with this:] No concrete rehabilitation work is identified on the Contract Plans. The Contract Documents will be revised accordingly in Addendum #2, that will be issued soon.
        Date of Answer:   1/16/2018 2:37:23 PM

                     
                                                                                                 
 

 
 

Subject5:  Bid extension
Question: Will the District please extend the bid period at least one week?
Date of Question: 1/8/2018 7:50:04 AM
 
         MWRDGC RESPONSE  1:   Yes, We are in the process of sending out an addendum which will include a one week extension until January 23rd.
        Date of Answer:   1/8/2018 7:51:43 AM

                     
                                                                                                 
 

 
 

Subject4:  Storm Structure/StormTrap/Underground Detention Tank
Question: Can the District provide any drawings/cut sheets/as-builts of the existing tank to be cleaned, sanitized, and sealed per this contract? The bidder is interested in access points, inlet and outlet connections, confined space considerations, extent and location of joints to be sealed, etc.
Date of Question: 1/5/2018 9:17:00 AM
 
         MWRDGC RESPONSE  1:   The design drawings and any additional drawings that can be located will be included in Addendum #2 that will be issued soon. Locations of the inlet and outlet connections can be found in the Contract Plans Sheet C-202.
        Date of Answer:   1/16/2018 2:36:40 PM

                     
                                                                                                 
 

 
 

Subject3:  Contaminated soils
Question: There is no way for the contractor to estimate the percentage of soils to be excavated and removed from site which may be contaminated per Section 02 6113, and thus bidders may vary in their assumptions. Will the District direct bidders to assume no contamination and provide a change order to handle any contaminated materials encountered? Or will the District add an allowance for handling of contaminated materials against which the successful bidder may invoice should contaminated materials be encountered? Please provide direction so that all bidders approach the issue with the same assumptions.
Date of Question: 1/5/2018 9:09:56 AM
 
         MWRDGC RESPONSE  1:   Any potentially contaminated soils will be addressed as an allowance item in the Addendum #2 that will be issued soon. Note that the bid date that is currently January 23, 2018 will be postponed in the Addendum #2.
        Date of Answer:   1/16/2018 2:36:11 PM

                     
                                                                                                 
 

 
 

Subject2:  Work Schedule
Question: Are there specific requirements for the Work Schedule? I see that one is required for payment of Mobilization, but can find no specifications for format, updating, etc. Is LoadSpring required for this project?
Date of Question: 1/4/2018 11:27:15 AM
 
         MWRDGC RESPONSE  1:   Information regarding work schedule requirements can be found in the Volume 2 Project Specifications, General Conditions, pages GC-11 – GC-13. All of the specific requirements for the Work Schedule should be covered there. Project Management submittals will utilize e-Builder enterprise project management system (Section 01305).
        Date of Answer:   1/5/2018 9:36:35 AM

                     
                                                                                                 
 

 
 

Subject1:  3 Pole 100A Breaker @ DPH-1
Question: Nowhere in the drawings or specs do I see a type and manufacturer for this new breaker. Please Advise, if not, is there someone I can speak with about visiting to look for myself? Thank you. Jason E. Lunsford LiveWire Electrical Estimator email:jlunsford@livewire-systems.com P:(708)-535-6001 M:(219)-869-5439 F:(708)-535-6108
Date of Question: 12/29/2017 7:57:46 AM
 
         MWRDGC RESPONSE  1:   Below is the response that we received from the electrical engineer regarding panel DPH-1: “The existing panel is an Eaton POW-R-LINE PRL3A. The existing breakers are Eaton Cutler-Hammer #ED3100 65KAIC.” Let us know if this doesn't cover your question. Thnaks
        Date of Answer:   1/5/2018 6:58:19 AM