Attachment_12_Questions_and_Answers_9_1_2026_0004.pdf

Folsom Dam Warehouse Bridge Crane Replacement

Solicitation No.: 140R2026R0017

Questions and Answers

1) Question: 09 96 20 Tabulation No. 04 – Please confirm this table is referring to items on the new crane that may be galvanized and not repair work on facility grating, ladders, handrails… We were unable to find those items in the SOW.

Answer: Tabulation No. 4 applies to galvanized surfaces which are damaged during construction, and which require repairs by the Contractor.

2) Question: 41 22 14 – Will the project allow a serially-manufactured COTS package hoist from a US manufacturer? The specification is written assuming a custom built-up hoist but from the pictures, it does not look like the user would benefit from this additional cost.

Answer: Per Section 41 22 14, paragraph 2.01 D 3 a, the design of the new crane must have similar size, shape, and scale of the existing crane to preserve its historical character. Alternative, “value adding” designs may be submitted with the Contractor’s proposal and will be evaluated as such.

3) Question: 41 22 14 2.01 F 1. Thruster brakes are an outdated and expensive method of braking for the travel drives. Would the project consider a CMAA standard A4 drive arrangement with motors with integral brakes at each endtruck similar to what is allowed at the trolley?

Answer: This is an acceptable design. Refer to revised specifications.

4) Question: 41 22 14 2.01 F 2. This is an outdated braking method. Our suggestion is to use

AC thruster brakes or a package hoist with a mechanical load brake and motor brake.

Answer: This is an acceptable design. Refer to revised specifications.

5) Question: RFP C.1 B 4 Please confirm that the cost to repair or replace the rails are not included in the FFP.

Answer: Options to repair or replace the rails are included as optional CLINs. Refer to the revised Section B - Price Schedule.

6) Question: 25 00 01 – Please clarify if an automation control and monitoring system is required. We generally do not use PLC’s on our cranes.

Answer: PLC is required for site-specific safety features and monitoring.

7) Question: 25 00 01 1.05 D If you require an automation system, please provide the performance characteristics. This section is very general. For example, it reads “provide real-time information…” but does not state how that information is to be used.

Answer: 25 00 01 1.05.D gives general performance requirements. Specific requirements are provided by the entirety of 25 00 01.

8) Question: 41 22 16 1.07 F - Please clarify the requirement here. ExP applications require a

TENV motor so there are no exposed conductors. A TEFC motor would not be rated for ExP applications.

Answer: Refer to revised specifications.

9) Question: 41 22 16 1.07 H 3. - Please clarify the need for this. Does encoder feedback for the hoist drive meet these requirements? That is typical for a closed-loop VFD but position feedback is very atypical for a crane. Traverse motions usually accomplish this by some sort of external bar code device on the bridge and runway.

10) Question: 41 22 16 1.07 I 1. - Please clarify if you require all the motors to be rated for outdoor use.

Answer: Per Section 41 22 14, paragraph 2.01 D 1 a, the crane is to be rated for indoor service.

11) Question: 41 22 16 1.07 J 7. – Please confirm this is not a requirement for a VFD-controlled motor.

Answer: This is correct; VFD-controlled motors do not have this requirement.

12) Question: 41 22 15 1.07 N 5. - Please confirm anticollision controller is not required since there is only one crane on the runway.

Answer: Per Section 25 00 01, paragraph 2.02 A 5, collision avoidance shall be included to limit the crane’s travel in certain areas of the Warehouse.

13) Question: 41 22 15 1.07 N 4 c 1. 5a 1) - Please confirm a VFD with built-in ability to adjust these parameters meets this requirement without a PLC.

Answer: VFD-integral acceleration control/limiting is acceptable. A PLC is still required for required safety features.

14) Question: 41 22 15 1.07 N 4 a conflicts with 7b Clarify 2-step or 5 step control.

15) Question: 41 22 15 1.07 N 7d – Clarify you require the VFD units to be oversized by 2.25x the manufacturer’s rating?

Answer: Correct – the VFDs should be oversized to accommodate up to 225% of the motors’ rated torque.

16) Question: 41 22 15 1.07 Q 6. – DC shunt brakes are very outdated technology. The currently one-to-one substitute would be an AC or DC shoe brake.

17) Question: 41 22 15 1.07 S. – Please clarify the performance requirement of the Microdrive?

Answer: Micro-drive means that microspeed capability is required for each of the hoist, trolley, and bridge drives.

18) Question: 41 22 15 2.03 D – Please confirm the open-loop is applicable the bridge/trolley and the closed loop applicable to the hoist.

Answer: Bridge/Trolley can be open- or closed-loop, depending on control settings;

hoist is closed-loop. Refer to revised specifications.

19) Question: 41 22 15 2.03 E – Please confirm Magnetek and PEI drives are an acceptable equal. They are the only VFD products approved for US Navy cranes. Their price point is less than Allen Bradley, they do not require PLC’s to operate, they do not require special software and training to program.

Answer: Specified hardware model(s) are provided as examples. Contractor is required to propose design-compatible hardware meeting the minimum requirements listed in the specifications. Approval or rejection of proposed hardware will not be provided until associated approval data submittal is reviewed.

20) Question: 41 22 15 2.03 E 13. – Please define “AUTOMATIC” mode.

21) Question: 41 22 15 2.03 E 16. – Clarify the performance requirements of these “macros.” Is this for installation purposes? We usually handle the startup in-house and generally don’t expect the user to have to perform further startup procedures.

Answer: VFD should support this functionality for installation and programming.

22) Question: 41 22 15 2.03 E 30 31 32. – Please confirm these features are required. They either seem inapplicable due to the nature of the build or excessive for the use conditions of the crane.

Answer: These features are required.

23) Question: 41 22 15 2.03 E 27. – Are all these inputs required even if the design of the crane motor control doesn’t require them?

Answer: VFD is required to provide loss-of-load feedback for alarming.

24) Question: 41 22 15 2.03 G 27. – Are all these ports required even if the design of the crane motor control doesn’t require them?

Answer: Refer to answer to Question 23.

25) Question: 41 22 15 2.03 H 2. – Please confirm the load cell, reader, and display are an independent system from the AC motor controller.

Answer: It is an independent system with it’s own reader and display.

26) Question: 41 22 15 2.03 I 1. – This section among others conflicts with E 31 Anti-skewing.

27) Question: 41 22 15 2.05 – Please verify if the crane requires an HMI. All the functions listed can be implemented using standard pushbuttons and indicator lights.

Answer: System requires an HMI for configuration of listed “no-fly zone” and other safety features.

28) Question: 41 22 15 2.10 E – Please verify if the crane requires floor spotlight.

Answer: Floor spotlight will not be required. Refer to revised specifications.

29) Question: 41 22 15 2.11 L – Please verify this statement. Low-voltage control transformers typically are located within the control enclosure.

Answer: Control enclosures are defined under Section 41 22 15, paragraph 2.04, which is referenced in the aforementioned 2.11 L.

30) Question: 41 22 15 2.13 – “Hardwired Controls” Please clarify where these shall be located.

Answer: As referenced in Section 41 22 15, paragraph 2.07 A, the hardwired controls apply to the switches, pushbuttons, joysticks, and other control devices on the manual control device (pendant).

31) Question: 41 22 15 2.18 – Please confirm the user requires these features. It seems excessive given the nature of the building.

Answer: The purpose of the laser sensors is to achieve the required anti-collison/no-fly zone capabilities. Other “value engineering” systems may be proposed.

32) Question: 41 22 15 2.19 – Please confirm the user requires this feature. It seems excessive given the nature of the building.

Answer: This will not be required. Refer to revised specifications.

33) Question: 41 22 15 2.21B – Please confirm the user requires this feature. It seems excessive given the nature of the building.

Answer: This will not be required. Refer to revised specifications

34) Question: 41 22 15 3.03 – Please confirm this requirement. It seems excessive given the nature of the building.

Answer: This will not be required. Refer to revised specifications.

35) Question: The specifications seem to indicate the access ladder from the ground will need to be replaced per OSHA 1910 requirements. Based on the site visit, we were unable to see where the existing ladder fails to meet those requirements. Please clarify the requirement.

Answer: The access ladder currently has a cage, which is no longer allowed and must be replaced with an acceptable ladder safety system per OSHA 1910.28.

36) Question: Is the existing main control panel grounded?

Answer: Yes.

37) Question: Please confirm there will be a path through the center of the building large enough for a boom lift to travel the complete length.

Answer: Yes, a clear path of approximately 14-feet through the center and the complete length of the building will be available for construction use. The width of the path is delineated with two yellow lines on the ground and the complete length of the building.

Note, there are several pieces of equipment that are permanently bolted to the ground that are outside of the yellow lines and will not be moved. See photos below.

38) Question: 25 12 10 2.01 A – Please confirm the crane requires a PLC accessible from the floor level? This would require installation of a festoon along the runway to carry the signal cables.

Answer: Refer to revised specifications. The location shall be on the bridge walkway of the crane.

39) Question: 25 12 10 2.02 K – Please clarify the purpose of a UPS? Without power the crane can not operate and powering the controls would be meaningless.

Answer: UPS is provided to avoid full PLC/control system reboots under momentary losses of power and to allow for safe PLC shutdown on loss of power.

40) Question: 26 43 13 – Please confirm you only require a surge protection device to protect the crane controls enclosure?

Answer: Control components and all VFDs should be equipped with surge protection.

41) Question: 50 02 82 1.01 B has an error in the document. Please confirm there is no relevant information missing.

Answer: The error was caused when printing from Word to PDF. The reference is to Table 51 02 82- A.

42) Question: There is a considerable amount of details regarding the HMI most of which we believe is excessive for this class of crane. Please confirm the remote programming interface of a Magnetek VFD meets the intent of the specification.

Answer: HMI is included to allow for monitoring of general system and safety feature status, and to ease parameter adjustments for “no-fly” zone, anti-skew, and other automated features. Alternative solutions may be proposed as value engineering change proposals.

43) Question: Are there building and bridge general arrangement drawings available to determine the crane envelope, runway configuration, and available clearances?

Answer: Yes, drawings are included with the amendment.

44) Question: What attachments are required to be included with our proposal (i.e., Attachments 4-7)?

Answer: The Attachments from Section J, to be included with your proposal are:

- Attachment 6, Limitations on Subcontracting (LOS)

- Attachment 7, Risk Assessment/Value Added

- Attachment 8, Past Performance Questionnaire (PPQ)

45) Question: The specification references a fully automated crane system. Based on the information provided, the intended application appears consistent with a conventional warehouse crane. To ensure alignment with the Owner's expectations, please provide additional details regarding the required automation features, operating sequence, and performance requirements. If the desired performance criteria can be met without a fully automated crane system, would the Customer consider alternative solutions that may reduce system complexity, cost, and commissioning requirements?

Answer: The automation control system as defined in Section 25 00 01, paragraph 1.03 A and refers to the application of technology to monitor and control processes on the crane. As this applies to this application, the automated features would include anti-collision, anti-sway, skew-correction, micro-speed zones, and other features which occur automatically through processes in the controls and not through manual interaction of an operator. Alternative solutions may be proposed as value engineering change proposals.

48) Question: Does BOR have a work week schedule at this site? Will contractors be able to work 5-day or 6-day workweek. Additionally, do contractors have (8-hour) or (10-hour) work schedule?

Answer: See Specifications Section 01 14 10, 1.04D for site access limitations, and Section 01 14 12, 1.02A for Work Restrictions.

49) Question: During the site visit, contractors were informed that during the project, the jobsite will be shared with BOR representatives. Will BOR be able to remove the excess equipment on the bay area to maintain better access to the bridge crane?

Answer: Yes, see answer to Question 37.

50) Question: Could BOR provide a site map for all potential areas for contractors' laydown space?

Answer: See drawing 485-D-61367.