Addendum 1 Letter for 2023 Storm Damage Repairs.pdf

Addendum No.1

2023 Storm Damage Repairs Project (LOP 5, 13, & 14)

Debris Removal S202300A & Permanent Repair Project S202300P

CITY OF LIVERMORE

COMMUNITY DEVELOPMENT DEPARTMENT

ADDENDUM NO. 1

TO THE

2023 STORM DAMAGE REPAIR PROJECT (LOP 5, 13, & 14)

PROJECT S202300A & S202300P

IN THE CITY OF LIVERMORE

June 26, 2024

This addendum consists of 501 pages: these 2 sheets, 1 page of pre-bid meeting sign-in sheet, 493 pages of current permits for the project with 1 page of cover sheet, and 4 pages of responses to bidder questions. All prospective bidders for the above referenced project are to be aware that the following changes, additions, and/or clarifications shall be included as an integral part of the contract drawings and specifications for the above referenced project and that they are bound by all conditions set forth therein. This Addendum does not change the Bid Opening date which remains Friday, July 9, 2024, at 2:30p.m.

THE BIDDER SHALL SIGN AND INCLUDE THIS FORM IN HIS SEALED BID PACKAGE

AND/OR FILL IN THE ADDENDUM NUMBER ON PAGE 14 OF THE BID PROPOSAL AS

ACKNOWLEDGMENT OF RECEIPT. FAILURE TO INCLUDE THIS FORM AND/OR FILL

IN THE ADDENDUM NUMBER IN THE BID PROPOSAL MAY BE CAUSE FOR THE

DISQUALIFICATION OF HIS BID.

Leo Sum, P.E.

Project Engineer

Company Name

Date Representative

THE FOLLOWING REVISIONS HAVE BEEN MADE TO THE SPECIFICATIONS

1. Revised Appendix 8 Stream Maintenance Program Requirements to include updated permits and documentation. (493 pages)

RESPONSE TO BIDDER QUESTIONS

1. Question: Is the contractor responsible for obtaining the necessary permits for the project?

Response: No, the City has obtained the necessary permits. The permits are included within this

Addendum.

2. Question: What is required for the Stream Maintenance Program (SMP) training?

Response: All of the contractors’ workers that will be onsite throughout the project need to attend the SMP training. The training must be completed prior to starting work at any site.

3. Question: What is the estimated duration of SMP training?

Response: The training typically takes about 30 minutes.

4. Question: Are there any endangered species with potential to occur within the work areas?

Response: Yes, there is potential for the federally listed California red-legged frog to be present at Airway Blvd. (LOP 5) and Creek Road (LOP 14) sites. There is a known occurrence of

California red-legged frog that has been noted downstream at the Airway Boulevard (LOP 5) site.

The work at Airway Boulevard and Creek Road require that a biologist be on-site during all construction activities. The City will provide the biologist.

5. Question: Do the project work sites have to be cleared daily prior to work to start?

Response: At LOP 5 and LOP 14 daily project clearances will be required by the City provided biologist. Work will be able to proceed once the site is cleared by the biologist at these locations.

The permits require that no ground disturbing activities can start until 30 minutes after sunrise and all ground disturbing activities must be completed 30 minutes before sunset.

6. Question: How much flow should be expected in the Arroyo Mocho during construction?

Response: The City is in coordination with Zone 7 to cut off flow to the Arroyo Mocho for a maximum of a three-week period. At that time no flow should be expected within the channel.

Ancillary groundwater is expected, and the contractor should be prepared to deal with groundwater if encountered.

7. Question: What is the expected pedestrian route for the work at Creek Road (LOP 14)?

Response: The contractor shall detour pedestrian traffic to the trail on the west end of Creek

Road, then to the sidewalk on the southside of Creek Road. The contractor shall then route pedestrians to the trail access east of 1791 Creek Road. Photos of the locations can be seen below.

The contractor shall take care to guard pedestrians at the interface between the pedestrian route and the contractor’s access route. A photo of the interface can be seen below.

8. Question: Can the contractor access Creek Road (LOP 14) from the pedestrian access routes?

Response: No, the contractor can only access the work for Creek Road from College Avenue as shown on the project drawings.

9. Question: Will additional repairs be needed for the portion of the asphalt pedestrian trail that will receive the contractor’s truck traffic for Creek Road (LOP 14)?

Response: The contractor shall restore the trail to original condition after the completion of construction.

10. Question: Can the contractor trim the trees along the contractor access route to allow truck traffic for Creek Road (LOP 14)?

Response: Yes, the contractor is allowed to trim the trees along the contractor access route. The contractor shall coordinate any tree trimming with the City prior to construction.

11. Question: Will additional repairs be needed for the portion of the asphalt pedestrian trail that will receive the contractor’s truck traffic for Creek Road (LOP 14)?

Response: The contractor shall restore the trail to original conditions after the completion of construction.

Contractor’s access route

Pedestrian

Trail

12. Question: How thick is the existing pedestrian trail for Creek Road (LOP 14)?

Response: Typical AC pathways have 2” of asphalt concrete over 4” of Class II AB. The contractor can assume that the trail for this project has similar thicknesses.

13. Question: Are the bollards seen in the photo below, on Creek Road, removable?

Response: The bollards should not be removed to provide access to Creek Road (LOP 14). The contractor shall access the site from College Avenue.

14. Question: Will a list of the environmental permits be provided?

Response: The environmental permits are included as a part of this Addendum No. 1.

15. Question: How far does the trail grading extend at Anza Way (LOP 13)?

Response: The contractor shall coordinate with the City regarding the extents of the trail grading at Anza Way (LOP 13). For the purposes of bidding, the contractor shall assume that the grading extends 565’ west of the storm drain that crosses the trail, and approximately 45’ east of the storm drain.

16. Question: Will additional screening be required when using the relocated material from the stockpile area at Anza Way (LOP 13)?

Response: No, additional screening will not be required. The contractor shall remove any organic material from the relocated material in the stockpile area prior to placing it on the trail.

17. Question: Will a biologist be required to be on-site at Anza Way (LOP 13)?

Response: No, a biologist will only be required at Airway Boulevard (LOP 5) and Creek Road

(LOP 14). A biologist will not be required at Anza Way (LOP 13) although all contractor staff are required to be trained prior to being on site.

18. Question: Will Zone 7 permits be required for Anza Way (LOP 13)?

Response: Yes. This work is within the jurisdiction of Zone 7, so the city will obtain an encroachment permit for both Creek Road (LOP 14) and Anza Way (LOP 13).

Existing bollards to remain in place during construction

19. Question: Will additional payment be granted if the relocated material, at Anza Way (LOP 13), amount exceeds the 200 CY called out in the project drawings?

Response: Yes, the contractor will be paid if additional material is required. The material shall be taken from the existing stockpile site, so no additional material will need to be brought to the site.

20. Question: Will a pre & post survey be required to determine the amount of relocated material that has been used at Anza Way (LOP 13)?

Response: No, a pre & post survey will not be required. The on-site inspector will be keeping track of the quantities of material used.

21. Question: Will re-planting be required at Airway Boulevard (LOP 5)?

Response: No, replanting will not be required at Airway Boulevard (LOP 5), however, the contractor is required to hydroseed any disturbed areas.

22. Question: Will there be any trees removed along the north bank at Airway Boulevard (LOP 5)?

Response: No, tree removal will not be required on the north bank at Airway Boulevard (LOP 5).

The work proposed to be completed along the north bank shall consist of limbing the existing trees and removing herbaceous vegetation. No excavation or tree removal shall be completed along the north bank. However, there are trees in the center of the Creek that are identified on the plans for removal.

23. Question: How large are the existing culverts underneath Airway Boulevard?

Response: There are three 120” arch culverts underneath Airway Boulevard. There is a concrete apron underneath the existing culverts.

24. Question: Approximately how deep is the water downstream of the existing culverts located at

Airway Boulevard (LOP 5)?

Response: The invert of the existing culverts is approximately 4.5’ below the current water level.

25. Question: Are there any ticks around the Airway Boulevard (LOP 5) project area?

Response: Yes, the contractor shall assume that ticks will be present around the Airway

Boulevard (LOP 5) project location.

26. Question: Will any equipment be allowed within the channel at Airway Boulevard (LOP 5)?

Response: No, the contractor shall not allow any equipment into the channel. The contractor shall access the site by placing an excavator on the top of bank and extending the bucket into the channel.

27. Question: Will any sediment be allowed to be released during construction at Airway Boulevard

(LOP 5)?

Response: No, the contractor shall not release any sediment into channel during construction.

The contractor shall install cofferdams downstream of the work area to ensure no sediment is discharged downstream. The on-site biologist will monitor instream turbidity to ensure there is not an increase in turbidity above the thresholds defined in the permits.