Please note: Drawings M105, M109, M203, M204, M205 and M207 were attached to ADDENDUM 2 and replace the previous drawings.

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1 Procurement Department Bid Office Customer Center 1 st Floor, Room W. Church Street Jacksonville, Florida June 20, 2016 ADDENDUM NUMBER: THREE (3) TITLE: Arlington East WRF Secondary Clarifier JEA RFQ NUMBER: BID DUE DATE: June 28, 2016 TIME OF RECEIPT: 12:00 PM THIS ADDENDUM IS FOR THE PURPOSE OF MAKING THE FOLLOWING CHANGES, CLARIFICATIONS, DELETIONS AND/OR ADDITIONS: Additions are in Red, underlined Font, and Deletions are in Red Strikethrough Font: Change: CLARIFICATIONS: The City of Jacksonville Building Permit fee has been updated in the bid form. The allowance for this item includes the building permits for electrical and mechanical and a site clearing permit. A building permit is required before any work on this project can begin. The building permit will require the submittal of Engineer reviewed and approved door and roofing (hollow core planks) for the Electrical Building. The Contractor is required to submit door and roofing (hollow core planks) shop drawings immediately after the contract is awarded for Engineer approval. The City of Jacksonville Building Department has a new Product Approval Form on their website which much be used for the Electrical Building door and roofing. The building permit will also require the Schedule of Values to be organized such that the fee can be assessed on the Electrical Building only (site work/civil, concrete, masonry, metals, thermal/moisture, doors/windows, finishes, specialties, HVAC and building-specific electrical, e.g. exclude VFDs/MCC). Please note: Drawings M105, M109, M203, M204, M205 and M207 were attached to ADDENDUM 2 and replace the previous drawings. RESPONSES TO BIDDER S QUESTIONS: Q1. Specification Section E. Article 2.02 E. calls out All structural design calculations shall allow for 1/16-inch corrosion allowance for all submerged carbon steel members. Section Secondary clarifier Modifications does not have this requirement, is the intention to only have this for

2 Clarifier No. 5 or is the intention to have this requirement for both the new clarifier and the clarifier modifications? A1. The intent is that all structural design calculations shall allow for 1/16-inch corrosion allowance for all submerged carbon steel members for both the new clarifier and the clarifier modifications. Section has been updated. Q2. Specification Section Article 2.08 A calls out an aluminum walkway and Article 2.08 B. calls out a structural aluminum frame for the center platform, however in Article 2.08 E. refer to structural steel members and that all structural members shall be hot dip galvanized. Is the intention to have the entire pony truss and the platform frame fabricated of aluminum or is the intention to have a hot dip galvanized steel pony truss with aluminum grating walking surface. The specification language is also similar for Specification Section Please confirm if the intention is to have an all-aluminum pony truss walkway and center platform frame or if the intention is to have hot dip galvanized steel pony truss with aluminum grating walking surface. A2. Intention is to have hot dipped galvanized steel pony truss and center platform with aluminum grating walking surface. Sections and have been updated. Q3. Both Section and calls out Stamford baffles and make reference to Drawing M204 Detail 7. This section call out the material to be stainless steel but not which grade of stainless steel. Section in article 2.07 B calls out the grade to be 304 stainless steel, Section does not call out what grade of stainless steel. The general specifications call out all stainless steel to be 316 stainless steel unless otherwise noted, please confirm if 304 stainless steel is the correct material for all the Stamford baffles. A3. Stamford baffles shall be FRP, see response to Q8. Q4. Section call out the minimum wall thickness for the center column to be 1/4-inch, Section call out the minimum wall thickness for the center column to be 3/8-inch. Typically the same minimum wall thickness is used for all clarifiers on the same project, is the intent to have different minimum thicknesses? The 1/4-inch wall thickness meet all structural requirements. A4. Center column wall thickness shall be minimum ¼-inch with minimum ¾-inch top and bottom flanges for all clarifiers. Section has been updated. Q5. Bid form: I believe bid lines 5d and 6d should also exclude the drives which were included on lines 5b and 6b. It seems that lines 5d and 6d were only intended to pick up all of the parts not included in lines a, b, c, and e. Please confirm and correct the bid form if my suspicions are correct. A5. Drive unit has been added to the items that are not to be included in bid lines 5d and 6d. Bid form has been updated. Q6. Specs and Bridges, platforms, walkways, and handrail: I still feel the spec is vague regarding the material you want for the structural bridge(s) and platforms(s). I had addressed this in my spec review but the language remains unchanged. Generally, the bridge and platform structure are steel and the walkway (deckplate or grating) and handrail are aluminum. The spec mentions steel and HDG and also mentions aluminum but is not specific what parts are what material. So..my question is whether your intention on the bridge and platform structure is to be steel or aluminum? FYI if aluminum, these bridges and platforms are going to be very expensive especially on the 160 diameter clarifier. A6. Bridge, platform and walkway structural steel shall be hot dipped galvanized. Grating, handrail and toeplate shall be aluminum. Sections and have been updated.

3 Q7. Specs and Bridges, platforms, walkways, and handrail: Spec for the clarifier modifications 2.09.D calls for two (2) aluminum ladders.as shown on the drawings. I cannot find any ladders on the drawings and I do not show any ladders on the equipment originally supplied by Walker on these tanks. Are ladders required and if so where can we find information for pricing them if you expect us to supply them? A7. Ladders are not required. Section has been updated. Q8. Specs and Weir plates, scum baffles, and density current baffles (Stamford baffles): Both specs call for FRP weir plates and scum baffles. That is fine and typically what we see. On the new 160 clarifier, the plans show stainless steel density current (Stamford) baffles but the spec does not have a section on them. It is very unusual for these to be made from stainless steel and if that is what is desired they are going to be very expensive. The industry standard for these is FRP and that is what I would recommend. On the clarifier modifications, the plans show density current baffles but do not mention any material. The spec calls for 304SS and references Division 5 Metals. Once again, stainless steel is very unusual and will be very expensive. Please verify that you in fact want the density current baffles made out of stainless steel or whether you would rather consider going to the industry standard FRP for these items and save a ton of money. A8. Stamford Baffles shall be constructed of FRP and designed by Florida PE utilizing dimensions and specifications provided on revised drawing M204. Section has been updated. Q Clarifiers #1 and #2 in building: Per the plans, it appears that clarifiers #1 and #2 are in a building. Are there any restrictions regarding the maximum part size that can fit through openings or doors? Is so we should be informed as it may alter the design of the parts we would be supplying. A9. No clarifiers are in buildings. They are all open air tops. Q10. Walker Field Assessment of 110 and 120 clarifiers #1 thru #4: As I commented on below and as we discussed on the phone, I think you need to define the intent and your expectations of Walker s field assessment of the existing clarifiers #1 thru #4. I believe your intention is for one (1) field visit per clarifier for a total of four (4) total trips for the four (4) clarifiers but the plan sheets are misleading regarding that. Also, Walker can do a visual observation and make recommendations for the components we feel should be replaced but the ultimate decision should be left up to JEA and/or H & S. I would recommend that during each of our visits, we visually inspect the clarifier with someone from JEA and/or H & S present and make a combined decision regarding replacement parts. For example, the drives are 15 to 20 years old. If they have been well maintained, they likely have many more years of service but we will not be able to see into them to make that call. They will likely need some attention in the coming years but it is impossible to determine how soon and how much. Therefore, JEA will need to decide if the expenditure to purchase new drives to replace the 15 to 20 year old drive with unknown life left is worth the expense. A10. The Field Assessment shall include one (1) field visit per clarifier for a total of four (4) total trips for the four (4) clarifiers by an engineer from Walker. The Field Assessment shall include inspection of each component from an engineering perspective to determine what components need to be repaired and/or replaced. These inspections will be primarily visual with limited measurement and analysis to determine the condition of each component. A representative from JEA will be present during the inspections. Q11. Spec Field Service for clarifier #1 thru #4 modifications: I do not know how to handle the field service requirements for the clarifier #1 thru #4 modifications since the bid is broken down into five (5) options. I cannot put all of the specified field service into the biggest option (Add #5d and 6d) because if that option is not taken but others are, then we will not be covered if you want service for

4 the options taken. I also should not add field service to an option that you will not expect service on because it will artificially escalate the price of that option. It would be best if you broke the required field service requirements into each option so we are all supplying the same field service. This is hard to put into words so it might be best if you called me to discuss. A11. Include inspection pricing of the four existing secondary clarifiers in Contract Item No. 2a. Q12. We respectfully request that WesTech be added to the list of approved suppliers for the Clarifier Equipment as specified under Spec Section and If acceptable, it will be necessary to allow WesTech s standard precision bearing drive in order for all Companies specified to bid their standard products. A12. Westech has been added to the list of approved suppliers under Spec Section and Requirements in both sections for the precision bearing drive have also been added. Q13. We respectfully request to have Fairbanks Morse added to the manufacturers list for the non clog, centrifugal pumps in Specification section Fairbanks has several other installations operational at JEA s facilities and pump selections for this project that exceed the engineer s specification. A13. Under 1.03 of Specification Section for RAS Pump Nos. 8 and 9, the minimum flow rate is 2,262 gpm at 13 feet Total Dynamic Head. For the proposed Pentair Pump selection for RAS Pumps 8 and 9, this point falls below the Minimum Continuous Stable Flow line. Per Specification Section A. "all pumps shall be supplied by the same manufacturer." At this time Fairbanks Morse cannot be added to the approved manufacturers list as the proposed pump selection does not cover the operating ranges of all three types of pumps listed in Specification Section Q14. Paragraph 2.01 of section allows for an approved equal for the specified pumping equipment. We respectfully ask for your consideration to include Grundfos/Yeomans as an approved manufacturer. The proposed Yeomans performance curves are attached for your review. Please note for RAS 5, 6, & 7 the proposed Yeomans pump would be supplied with a 40hp non-overloading driver as specified and not 50hp as shown on the attached typical curve. A14. The provided performance curves are acceptable. Yeomans will be considered an approved equal for the RAS and WAS pumps. The proposed pumps and motors will need to meet all applicable sections of the project specifications including but not limited to sections 11000, and Q15. On sheet M203, one area calls out the weir as being 9 high x 1/2 thick X 3 deep V notch on 7 centers and 5 washers with ½ anchors. Another area calls out the weirs as being ¼ thick x 13 high with a 3 deep V notch on 6 centers and 7 washers and 3/8 anchors. Please clarify what is required for the V Notch Weirs. The specifications call out Stainless Steel baffle supports and the drawings call out for FRP baffle supports. Please clarify which is correct and required on this project. A15. V-Notch weirs shall be as dimensioned in Detail 4 on revised drawing M203. Baffle supports shall be stainless steel. Q16. On the gate schedule for Spec Section there are gates listed as Clarifier No 1 Isolation Gate, Clarifier No. 2 Isolation Gate, Clarifier No. 5 Isolation Gate 1, and Clarifier No. 5 Isolation Gate No. 2. We have not been able to locate these gates on the drawings, please advise on their location. A16. Clarifier No. 1 and Clarifier No. 2 Isolation Gates are shown on revised drawing M105. Clarifier No. 5 Isolation Gate No. 1 and No. 2 are shown on revised drawing M109. Q17. Clarify material of clarifier bridges. A17. See answer to Questions 2 and 11.

5 Q18. On behalf of Aquarius, with respect to the single drop diffusers, we have a request for clarification. We have reviewed Addendum #1 and the changes that are relevant to Drawings M106, M108 and M110. There were no changes to these drawings or to our equipment Section relevant to our scope of supply. However, upon reviewing the Addendum which included Section Schedule of Values, the Schedule of Assets Table on Page shows a quantity of One Hundred and Thirty-One (131) Single Drop Diffusers in the Mixed Liquor Channel which is in conflict with the quantity of One Hundred and Twenty-Five (125) that is specified in Section 11440, Paragraph 2.01.B on Page 3. Additionally, the actual quantity shown on the drawings are not 100% clear due to the cut lines. As such, could you please clarify the quantity of single drop diffusers to be furnished on this project? A18. Quantity of single drop diffusers shall be 125. Section has been updated. Q19. Can you clarify if Lightning Protection is required? A19. Lightning protection is not required. Q20. Williams has noted the Specification Section Pre-Engineered Metal Building states that Dead Load shall be the total weight of all attachments to the structure. All piping shall be assumed to be running full of sludge for design purposes. Please advise on what the contractor should assume for an appropriate dead load for the pipe full of sludge. A20. A unit weight of 70 pcf should be used for calculating the weight of sludge in a pipe. The self weight of the pipe must be added to this. However, please note that there are no pipes hanging from the pre-engineered metal building system. **** Bidder shall acknowledge this Addendum on the Bid Form****