Part II RFIs combined Responses CUP Bid Package KW Reviewed.pdf

DALLAS CENTRAL UTILITY PLANT

36C10F20R0091

RESPONSE TO RFI

Part II

Question 2.001 : Reference Statement of Work for CUP Project 549-820E. The statement of work (SOW) outlines the requirement to install a new 1,500 ton chiller and associated equipment, and six (6) new pre-packaged stainless-steel cooling towers. Reference contract drawings 70-MP-102, site plan, 70-M-601, HVAC Schedules (Cooling Towers, Chiller, &

HVAC Pumps – Condenser), and 70-M-611, HVAC Condenser Water Flow Diagram.

The statement of work outlines the requirement for 6 new cooling towers (70-CT-3, 4, 5, 6, 7 &

8) as scheduled on M-601 (3,000 gpm (1,000 ton) each cell). Contract drawing 70-M-611 details a total of 9 cooling towers and 9 condenser pumps. The equipment schedule notes 6 new condenser pumps (3,000 gpm). The new chiller is a 1,500 ton unit and requires 4,500 gpm for the condenser water flow. Cooling tower 70-CT9 is also noted on the condenser flow diagram as a

1,000 ton (3,000 gpm) tower.

Questions:

1. Please clarify the quantity of cooling towers required for the project?

2. Please clarify the quantity of condenser water pumps required for the project?

3. Please clarify the equipment schedules for the cooling towers and the condenser water pumps, i.e., 70-CT9 1,500 ton (4,500 gpm) condenser water pump 70-CWP-9 4,500 gpm?_

Response:

1. There are 6 new 1,000 ton cooling towers.

2. There are 6 new 3,000 GPM condenser water pumps.

3. There are 6 new towers each with a 3,000 GPM pump for a total of 18,000 GPM, each with a

VFD on the pump. There are 4 existing chillers that require 3,000 GPM each and one new chiller that requires 4500 GPM for a total of 16,500 GPM required. The towers have a common header.

The flow to each chiller will be controlled by head pressure.

Question 2.002 : Reference: Amendment #3, Revised Cooling Tower Specification, Statement of Work, and Contract Drawing 70-M-601, Equipment Schedule

(Cooling Towers), General Remarks #1 (Stainless Steel).

Questions:

1. Please confirm that cooling towers can be constructed using UV-resistant fiberglass reinforced polyester casing panels in lieu of stainless steel as schedule and noted in the statement of work?

Response: Refer specification section 23 65 00 COOLING TOWERS as amended and issued for ADDENDUM 2. Also refer to revised drawing 70-M-601. [[ The specified towers have stainless steel construction with FRP side panels. It is also acceptable to provide all stainless steel construction (in lieu of FRP side panels) as indicated within the specifications. ]]

Question 2.003 : Reference drawing sheet 70-C-701. Please clarify the statement that contractors and subcontractors will be required to park off site. Will contractor parking be allowed at the contractor staging area (hatched area), or does this statement infer that contractors must find parking somewhere completely off of the VA campus property?

Response: Contractor is required to provide off-site parking for employees and subcontractors.

Question 2.004 : Reference drawing sheet 70-C-301 and 70-AS-101. There is a statement on these drawings saying to repair existing concrete to remain at locations where there are "existing surface defects". Please clarify what is meant by existing surface defects and quantify these areas as we are not able to quantify them prior to demolition.

Response: There is no specific listing of such existing surface defects available. The CUP project site tour that followed the pre-bid meeting was available for review of such surface defects.

Question 2.005 : Reference C. Part III - PROPOSAL INSTRUCTIONS

C1. General 3:4 states "The documentation submitted shall provide the offeror’s total aggregate bonding capacity, the amount currently in use to bond other contracts and the remaining amount, current available bonding capacity and expected available capacity in 2019 and 2020."

Please provide the correct year range the "current available bonding capacity and expected available capacity" should cover.

Response: The documentation submitted shall provide the offeror’s total aggregate bonding capacity, the amount currently in use to bond other contracts and the remaining amount that represents the current available bonding capacity as of Dec. 31. 2020 no later than the date of proposal submission (proposal due date). Correction to this criteria requirement is provided on

Amendment 00005.

Question 2.006 : Reference sheets 70-MD-102 and 70-MP-102. The demarcation location for the underground CWS and CWP running underneath the service road for CT6 are not matching

up. On the demolition drawings it show removal of piping to the north side of the service road and on the new installation drawings it shows the new connections being out in the service road.

Which is correct?

Response: The connection points should be the same, the scale is different. The locations are approximate and the actual underground pipe routing and optimum connection point must be determined in the field.

Question 2.007 : Reference: Amendment #3, Revised Cooling Tower Specification, Statement of Work, and Contract Drawing 70-M-601, Equipment Schedule (Cooling Towers), General

Remarks #1 (Stainless Steel).

Questions:

1. Please confirm that cooling towers can be constructed using UV-resistant fiberglass reinforced polyester casing panels in lieu of stainless steel as schedule and noted in the statement of work?

Response: Refer specification section 23 65 00 COOLING TOWERS as amended and issued for ADDENDUM 2. Also refer to revised drawing 70-M-601. [[ The specified towers have stainless steel construction with FRP side panels. It is also acceptable to provide all stainless steel construction (in lieu of FRP side panels) as indicated within the specifications. ]]

Question 2.008 : Box 1. SOLICITATION NUMBER of the SF1442 shows the

"36C10F20R0091" as the solicitation number. This does not match the number

"36C10F19R0021" noted in the top left-hand corner of pages 3-61 of the RFP.

Please confirm the SF1442 Box 1 number is the correct solicitation number.

Response: Correct solicitation number is 36C10F20R0091 and should be used on all correspondence for this acquisition. See amendment 0007.

Question 2.009 : The RFP states on page 14 of 71 - C3. Technical Proposal Requirements

"1. TECHNICAL PROPOSAL – The technical proposal shall be limited to no more than 160 single sided, 8 ½” x 11” pages and shall address the evaluation factors. Pages beyond the stated limit will NOT be considered. The pages of the technical proposal must be numbered."

Do pages including cover sheets, Table of Contents, Tabs/Dividers, SF1442, Bid-Bond, Amendments, Bonding Letter, OSHA Safety Report, EMR document, Financial Resource availability, PPQs, etc. count towards this 160-page limit?

Response: See item C4. Price, 1. Price Proposal Submission. The beforementioned items are included in the Price Proposal or the Technical Proposal. The Technical and Price proposals are submitted separately. The pages for the Price Proposal are not included in the Technical proposals page count. Price proposal attachment is limited to 20MB size, while the Technical proposal has it’s own size limit in page count and attachments limited to 20MB. Please see C3

Technical Proposal requirement. Amendments are included in the Price proposal Tab 3 and part of the 20MB size, (Only the signed page of the amendment, please do not include any attachments provided on such amendments).

Question 2.010 : The RFP states on page 14 of 71 - C3. Technical Proposal Requirements

"1. TECHNICAL PROPOSAL – The technical proposal shall be limited to no more than 160 single sided, 8 ½” x 11” pages and shall address the evaluation factors. Pages beyond the stated limit will NOT be considered. The pages of the technical proposal must be numbered."

Given the level of detail requested by the RFP, can we use an 11" x 17" paper size for items such as the time scaled bar graph format schedule documents, organizational chart, and other similar requirements?

Response: Please adhere to the page size as stated in the instructions.

Question 2.011 : Reference specification 01 00 00, General Requirements, paragraph 1.5.C., Guards. Do we have to provide unarmed guards for after hours security?

Response: Refer to specification 01 00 00, General Requirements, paragraph 1.5.C., Guards:

“1. The General Contractor shall provide unarmed guards at the project site after construction hours.”

Question 2.012 : Reference specification 01 00 00, General Requirements, paragraph 1.5.F., Motor Vehicle Restrictions. Please clarify the requirement for submitting authorization requests for motor vehicles entering the site in general (construction staff) and for deliveries, i.e., 24 hour advance notice. Will this be required for this project?

1. Vehicle authorization request shall be required for any vehicle entering the site and such request shall be submitted 24 hours before the date and time of access. Access shall be restricted to picking up and dropping off materials and supplies.

Response: Refer to specification 01 00 00, General Requirements, paragraph 1.5.F., Motor

Vehicle Restrictions:

“1. Vehicle authorization request shall be required for any vehicle entering the site and such request shall be submitted 24 hours before the date and time of access. Access shall be restricted to picking up and dropping off materials and supplies.”

Notification must be provided to the SRE in writing or by email.

Question 2.013 : Reference specification 01 00 00, General Requirements, paragraph 1.6.N.

notes that we need to maintain at least one lane of traffic at all times but the mechanical piping drawing 70-MP-102 notes the connection points for the new condenser water piping and the new condenser piping for the new chiller in the current service road outside the chiller plant. Based on the depth of the excavations and the trenching requirements to protect the workers it will not be possible to maintain one lane of traffic. Please advise on how we should address this situation, i.e., weekends, after hours, etc., to expedite the work outside the normal working hours or continuous until the work is completed.

Response: Portions of the loop road between the plant and the cooling towers can be completely blocked off for certain limited periods of time during construction for a combined total of up to five weeks duration including without a provision to require maintaining one lane open during that “combined total” time frame. [[ i.e This “all lanes” closure for this road could be made up of multiple different closures (possibly of differing durations) all of which when totaled together do not exceed five weeks duration. ]] Refer Drawing 70-GS-001 (GENERAL-

ENERGY CENTER PHASING PLAN) as modified in ADDENDUM 2, for notes and additional information concerning requirements impacting this loop road and refer to other related bid documents. All such road closures must be coordinated and scheduled in advance with the VA

Resident Engineer and the local station and as per related requirements included within the Bid

Documents and the General Requirements. Access to the O2 tank in the fenced yard with the cooling towers must be maintained and coordinated with the VA throughout construction activities. (Also refer to response provided with CUP RFI # 3.056 for additional information.)

Question 2.014: Reference specification 01 00 00, General Requirements, paragraph 1.17, Resident Engineer’s Field Office. Please provide additional information on the Resident

Engineer’s Field Office:

a) Will there actually be one?

b) Who will be providing the office?

c) Where will it be located? It’s there already, see drawing

d) If provided by others, are we still responsible for maintaining it?

Response:

a) Yes.

b) It’s there already. It is owned by the VA.

c) It’s there already within the staging area shown with the hatching on drawing sheet 70-C-701.

d) Yes.

Question 2.015 : Reference specification 01 00 00, General Requirements, paragraph 1.31, Photographic Documentation. Are we required to hire a professional photographer to meet this requirement, or can this work be done by in-house personnel?

Response: Professional photographer is required. The qualifications are listed in specification

01 00 00, General Requirements, paragraph 1.31.

Question 2.016 : Reference specification 01 32 16.13, Network Analysis Schedules – Major

Projects, paragraph 1.3, Contractor’s CPM Consultant. Please clarify if an independent CPM consultant is required for this project or if this work can be performed in-house.

Response: CPM consultant is required.

Question 2.017 : Reference specification 01 91 00, General Commissioning Requirements, paragraphs 1.3 and 1.6. Please clarify which systems are to be commissioned, i.e., new hvac equipment, new electrical equipment, new controls, refrigeration evacuation system, new plumbing systems, and new piping systems.

Response: All new equipment and controls are to be commissioned. [[ Commissioning requirements are included within the issued CUP documents, including but not limited to provisions within the following specification sections: 01 00 00, 01 32 16.13, 01 45 00, 01 91

00, 22 08 00, 23 08 00, 23 09 23, 26 08 00, 26 09 13, 26 09 23, 26 18 41, 26 51 00, and 28

31 00. ]]

Question 2.018 : Reference specification 01 91 00, General Commissioning Requirements, paragraph 1.8, VA’s Commissioning Responsibilities. Please confirm that the VA will procure the Commissioning Firm/Agent as specified.

Response: VA will procure the Commissioning Firm/Agent as specified.

Question 2.019 : Reference drawing 70-E-501. Please provide a drawing reflecting the location of “SWGR2” as shown in 1-Line.

Response: SWGR2 is located in the switchgear room adjacent to DBCP.

Question 2.020 : Reference drawing 70-E-501. Please provide "Site Plan E2 Existing Dwgs" as referenced in the 1-Line.

Response: Drawing 70-E-501 is being amended to remove this note. (Refer ADDENDUM 2.) If locations are needed, a site plan showing the location of the switches can be provided to the selected contractor after award.

Question 2.021 : Reference drawing 70-E-501 note 3, stating to replace 5KV wiring. What are the areas of destination and source for distance measurements?

Response: This note is no longer used and should be ignored. Drawing 70-E-501 is being amended to remove this note. (Refer ADDEDNUM 2.)

Question 2.022 : Drawing 70-EP-101 shows tapping into DBCP with a 1000amp breaker, yet on 70-E-501 (1-Line) it is shown as an 800amp breaker.

Which is correct?

Response: 800A is correct. Drawing EP-101 is being amended. (Refer ADDENDUM 2.)

Question 2.023 : Is there a drawing available showing approx. location/s of buried duct bank/s to towers? Please provide.

Response: The VA will provide a utility survey to the successful contractor after award. The successful contractor will be expected to field verify information contained within the survey.

Question 2.024 : How many cooling fans are needed for the 2500KVA transformer in SWGR1 on 70-E-501 per note 9?

Response: The existing Transformer is Square D serial number 930269-A1. Contact the manufacturer for cooling fan requirements.

Question 2.025 : Is there a specification to show the required hp or diameter (size) of the required transformer cooling fans?

Response: The existing Transformer is Square D serial number 930269-A1. Contact the manufacturer for cooling fan requirements.

Question 2.026 : Note 11 on 70-E-501 calls out a combination 5KV solid state starter/disconnect. Are there any specs or a NEMA size on this starter?

Response: This starter will be provided by mechanical sub contractor with the chiller.

Coordinate with mechanical.

Question 2.027 : Reference drawing 70-E-501. Does SWGR2 currently have the 3 – 200amp fuses in space 4 or do we need to provide them?

Response: 200A fuses are existing.

Question 2.028 : Reference drawing 70-EP-102. What size conduit and conductors are required for the individual vibration switches listed in note 10 of drawing 70-EP-102? (2” is shown as a main feeder from building)

Response: Vibration switches require a 120V circuit and there will be control wiring between the switch and the VFD via a relay. Coordinate with mechanical sub-contractor.

Question 2.029 : Reference Specification 22 05 19, Meters and Gages for Plumbing Systems, paragraphs 2.1, Compound Water Meter and paragraph 2.3, Water Meter Programming, and contract drawing 70-P-101. Please clarify if the type of water meters required for the make up water line for the cooling towers (main and remote meters), i.e., digital smart meter with reset functions, totalizer functions, and reporting to the existing Siemens Apogee

Control system. Also, please define the alarm functions, i.e., loss of pressure (no flow – water outage) or high flow (broken pipe, faulty fill valve, etc.).

Response: Provide a digital smart meter with reset functions, totalizer functions, and reporting to the Siemens Apogee Control system as described. Provide alarm for no water flow and provide high flow alarms.

Question 2.030 : Reference contract drawing 70-P-101, Make Up Water line. Please advise on the size of the make-up water line for each tower and what type of valve is required for the new tower sumps, i.e., float valve or electronic?

Response: The existing drawings indicate an 8” make-up water line to the cooling towers.

Contractor to field verify existing size of line prior to replacement.

Question 2.031 : Reference Specification 22 05 33, Heat Tracing for Plumbing Piping, paragraph 2.1.F.5. Voltage 277. Please clarify the voltage for the heat trace, mechanical drawings note 208V for the mechanical piping heat trace.

Response: Provide 277.

Question 2.032 : Reference Specification 23 25 00, HVAC Water Treatment, paragraph 1.3.B.

Please provide information on the company currently providing the chemical treatment system and chemicals for the open loop (cooling towers) and the closed loop (chiller) with their contract information for coordinating the requirements outline in section 23 25 00.

Response: VA to provide information on existing water treatment contract to successful contractor after award.

Question 2.033 : Reference Specification 26 05 11, Requirements for Electrical Installations, paragraph 1.14. Please advise if there is any PCB materials shown for disposal for this project.

Response: There are no known PCB materials that will require disposal.

Question 2.034 : Reference Specification 26 05 71, Electrical System Protective Device Study, paragraph 1.1. Please provide a copy of the latest short-circuit study for the energy center which indicates the available fault currents and the associated single line diagrams that outline the current fault levels for the incoming service and the rating of the switchgear/switchboards, i.e., SWGR2, DBCP, and DBCT).

Response: There is no existing electrical short circuit study available. (There is provision within specification section 26 05 71 to create an Electrical System Protective Device study within the scope of this current project.)

Question 2.035 : Reference Specification 26 08 00, Commissioning of Electrical Systems, paragraph 1.5., commissioned systems. Please clarify the systems to be commissioned, i.e., new electrical distribution system, etc.

Response: All new electrical systems and connections to existing equipment to be commissioned. [[ Commissioning requirements are included within the issued CUP documents, including but not limited to provisions within the following specification sections: 01 00 00, 01

32 16.13, 01 45 00, 01 91 00, 22 08 00, 23 08 00, 23 09 23, 26 08 00, 26 09 13, 26 09 23, 26 18 41, 26 51 00, and 28 31 00. ]]

Question 2.036 : Reference Specification 26 09 23, Lighting Controls, and contract drawings

70-EP-102, 70-ED-102, and 70-E-002 (fixture schedule K1). Please clarify the lighting control requirements for the project since we are connecting to the existing lighting circuits as noted on

70-EP-102.

Response: Lighting to be controlled by photocell.

Question 2.037 : Reference Specification 26 41 00, Facility Lighting Protection, and Contract

Drawing 70-EP-102, General Note 1. Please confirm that we are to only extend the existing lightning protection system to the new cooling towers and bonding of the new equipment, but not a complete master labeled system.

Response: Extend existing lightning protection system from the existing cooling towers to the new cooling towers to meet LPI standards. Bond new exhaust fans, to be located on roof of

CUP, to existing lightning protection system per LPI. Coordinate location of exhaust fans with mechanical.

Question 2.038 : Reference Specification 26 42 00, Cathodic Protection. Please provide an as-built drawing for the existing cathodic protection system that is installed to protect the underground piping and the location of the cathodic protection test wells.

Response: There is not an existing Cathodic Protection System drawing available. (The cathodic protection system to be provided within the scope of this project is a stand-alone system that will not connect to any existing cathodic protection system.)

Question 2.039 : Reference Specification 28 31 00, Fire Detection and Alarm. Please clarify the requirements for a fire alarm system for this project.

Response: Contractor to determine if any new fire alarm detection equipment is needed and if so, it must tie into the existing system.

Question 2.040 : Please clarify the purpose of the following specification sections. Are they applicable to this project?

• 04 05 13 Masonry Mortar

• 04 05 16 Masonry Grouting

• 04 20 00 Unit Masonry

• 26 11 16 Secondary Unit Substation

• 26 12 19 Pad-Mounted Liquid Filled Medium Voltage Transformer

• 26 18 41 Load Interrupter Switches

Response: These specification sections are provided in case work was needed on existing equipment or if work becomes necessary impacting existing construction.

Question 2.041 : Is there branch circuit power available in the existing yard to use for power of the listed transformers?

Response: Your question is unclear. The transformer in question is not in a yard and is indoors.

There are panels in the area from which to bring power.

Question 2.042 : Is there branch circuit power available in the existing yard to use for power of the listed transformers?

The transformer that they are asking to have a fan added to is in an outdoor substation yard. The primary voltage is 15,000 volts and the secondary is 480 volts. If there is no branch circuit available there at the transformer, this would require one or more fused disconnect switches to be powered directly from the secondary lugs of the transformer in the yard (substation), which would be an additional cost. However, if there is already a branch circuit panel out there in the substation yard for miscellaneous lighting and / or equipment, there may be a way to power the added cooling fans already there.

This is the reason for the question.

Response: Your question is unclear. The transformer in question is not in a yard but it is indoors. There are panels in the area from which to bring power.

Question 2.043 : Please verify the type of existing underground piping used for the condenser water to and from the existing cooling towers. The VA Master Specification which were used until 1995 required the installation of ductile iron pipe for the underground condenser water system, see VA Master Spec 15705 for reference. If the existing piping is indeed ductile iron, we would recommend using ductile iron and not installing a mechanical adapter underground to transition the existing ductile iron to steel pipe as this could cause major issues down the road.

Response: The specific composition of the material of the existing underground condenser water piping is unknown. If the existing condenser water piping is other than that specified for installation, then contractor shall provide industry approved connector that will accommodate such dissimilar materials.

Question 2.044 : Drawing 70-S-021 Says Bearing Strata for caissons is Grey Shale. The

Geotech report has a layer of brown limestone on top of a layer of grey limestone. Which strata are the caissons to be socketed in?

Response: The caissons are to be socketed into grey limestone.

Question 2.045 : The two nearest structures in the Geotech report show variances of between 5 to 7 feet in in the depth of the bearing strata. Can we get a target depth of caisson and have an over and under price breakout to allow for variance in the bearing strata depth?

Response: 7 feet in depth for the bearing strata is the target depth. For any significant differences in overall combined pier depth (totaling less than 85% of overall length or greater than 115% of overall length as calculated for the bid) as encountered during construction activities, these will be treated as an unseen site condition and if necessary, become a negotiated change order.

Question 2.046 : There is a conflict between the plan view on 70-S-101 and section C8 on 70-

S-201. The plan view calls out a ½” compressible Expansion Joint between the existing basin and the new basin slab. C8 shows dowels, a cut in keyed joint and waterstop at the interface.

Please clarify what is desired.

Response: The dowels, cut in keyed joint and waterstop at the interface is the desired application.

Question 2.047 : Waterstop is specified at certain keyed joints on drawing 70-S-201. No width or profile is called out in either the drawings or specifications, please clarify.

What pitch is the canopy roof supposed to have?

Response: They are to be ‘1-1/2” KEY W/WATERSTOP’. Equipment canopy roof slope to be

¼” per foot, unless this conflicts with minimum slope requirement per manufacturer of roof panels.

Question 2.048 : Can you provide a connection detail for connecting the W16 x 40 beams to

W12 x 26 main beams between column lines TA and TD?

Response: Refer detail B3 / 70-S-021 for connection detail.

Question 2.049 : Drawing 70-C-00 indicates a drawing 70-C-801. The Drawing is not in the set, nor is it shown on the drawing 70 GI-001 index. Will it be furnished later?

Response: There is no drawing 70-C-801 to be included in this package and it will not be included later. (( As referenced in your question, Drawing 70-C-801 is listed on the CIVIL index (70-C-00) as the Construction Staging Plan. There is a Construction Staging Plan included in the CIVIL set but it is labeled 70-C-701. )) Refer to drawing 70-GI-001 for the correct index listing of the CIVIL drawings which are included within this package. Disregard the index listing of CIVIL drawings on drawing 70-C-00 because it is incorrect.

Question 2.050 : What material is the interconnecting piping for the separator package to be made of? The suction and sweeper piping are shown to be Sch 40 PVC

Response: Specification section 23 65 00-2.2-A indicates schedule 80 PVC interconnection piping.

Question 2.051 : Drawing 70-M-611 Shows 7 Cooling Towers instead of 6 indicated on 70-

MP-12 and 70-M-601. Please confirm only 6 towers and 6 supply pumps are required

Response: There are 6 new cooling towers required. Refer revised drawing 70-M-611 included with ADDENDUM 2.

Question 2.052 : Drawing 70-M-301 shows a 6” recirculating pump in the 6” CHS recirculating line. This piece of equipment is not listed in the HVAC Schedules on 70-M-601 or the flow diagram on 70-M-610. Please Provide data on this pump.

Response: That is a chilled water bypass valve with control actuator. Refer to 70-MI-601.

Question 2.053 : Section F4 on Drawing 70-M-301 shows the new 70-CCU 5 tying into 24”

CHS and CHR. The plan view on 70-MP-101 shows the CHR and CHS mains as 20” Which is correct?

Response: The existing drawings indicate 20” but this was before the chilled water storage tanks were installed. Contractor to field verify existing pipe size before proceeding with the work.

Question 2.054 : Drawing 70-MP-101 shows the inlets and outlets of 70-CHP11 and 70-CHP12 to be 16” diameter pipe the flow diagram on 70-M-610 Shows those pipes to be 12”. Which is correct?

Response: The correct size is 16”. Refer revised drawing 70-M-610 included with

ADDENDUM 2.