QnA 1.17.23.pdf

Questions and Answers during Advertisement for CA NP GOGA 469(1) China Beach Access Road

January 17, 2023

Questions Answers 1 Please clarify and/or specify the location of the Vertical Flute as called out on the Wall Relief Detail and Section A-A for the Soil Nail Typical Wall Sections.

Vertical flute spacing is located on the Wall Plan and Elevation sheets for each wall (refer to the corresponding G sheets in the Plan set). For example:

2 Plan Sheet T26, Fixture (Trail Box Steps) shows the use of Alkaline Copper Quaternary (ACQ). Suppliers are telling us ACQ was discontinued as a preservative treatment and a similar water-borne treatment Copper Azole (CaC) is available and meets the same AWPA specs. Will CaC be acceptable?

An answer for this question will be posted with the next QnA update.

UPDATE: Yes, the alternate preservative treatment that meets AWPA specifications is acceptable. Please refer to Amendment A002.

3 Is there a database, website, or list of “Craftsmen Non-Slip Large Ground Profile” contractors outlined in Section 501?

Shaw Associates is the preferred installer noted by the LS team for the Craftsmen systems.

Here is the web link.

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4 Can you confirm if this job is a Set Aside for only HUBZONE contractors, or can all contractors place a bid?

As shown on the title page of the Invitation for Bid, only HUBZone Small Businesses are allowed to bid on this project.

5 Please identify what medium should be used for the graphics on the entry sign.

Should letters be raised or screen printed on corten steel?

Please refer to plan sheet T19 Special 633-E Park Entrance Sign Details. . The standard way the park does these signs is a backing being visible through voids cut in the corten steel for the lettering. See below for an example image.

6 Just double-checking the bid due date.

The SF1442 says 1/12/2023, 2 pm local time.

As shown in sam.gov, this will be Mountain Standard Time. “Local time” refers to our main Denver office local time.

https://gcc02.safelinks.protection.outlook.com/?url=https%3A%2F%2Furldefense.com%2Fv3%2F__https%3A%2F%2Fviewer.joomag.com%2Fshaw-associates-reference-guide-digital-version%2F0247310001653326908%3Fshort%26__%3B!!OepYZ6Q!_8LyvTsn0LGuuYOQlwC0G7GmNmdBP8y7NlLNTVBuDlFlZBuKTQ2-GpnJ4rrfY0ftdFix6uAYCpILVwwxRvgemlOuavi7tw%24&data=05%7C01%7CLeslie.karsten%40dot.gov%7C3ac5799f2c0c41234c2908dae82032b2%7Cc4cd245b44f04395a1aa3848d258f78b%7C0%7C0%7C638077522247549464%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=Igr4u7Hud3L9fCH%2BNue8rYDerm0ndd%2B%2BpG2Tz3X%2Fzeg%3D&reserved=0 https://gcc02.safelinks.protection.outlook.com/?url=https%3A%2F%2Furldefense.com%2Fv3%2F__https%3A%2F%2Fviewer.joomag.com%2Fshaw-associates-reference-guide-digital-version%2F0247310001653326908%3Fshort%26__%3B!!OepYZ6Q!_8LyvTsn0LGuuYOQlwC0G7GmNmdBP8y7NlLNTVBuDlFlZBuKTQ2-GpnJ4rrfY0ftdFix6uAYCpILVwwxRvgemlOuavi7tw%24&data=05%7C01%7CLeslie.karsten%40dot.gov%7C3ac5799f2c0c41234c2908dae82032b2%7Cc4cd245b44f04395a1aa3848d258f78b%7C0%7C0%7C638077522247549464%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=Igr4u7Hud3L9fCH%2BNue8rYDerm0ndd%2B%2BpG2Tz3X%2Fzeg%3D&reserved=0 https://gcc02.safelinks.protection.outlook.com/?url=https%3A%2F%2Furldefense.com%2Fv3%2F__https%3A%2F%2Fviewer.joomag.com%2Fshaw-associates-reference-guide-digital-version%2F0247310001653326908%3Fshort%26__%3B!!OepYZ6Q!_8LyvTsn0LGuuYOQlwC0G7GmNmdBP8y7NlLNTVBuDlFlZBuKTQ2-GpnJ4rrfY0ftdFix6uAYCpILVwwxRvgemlOuavi7tw%24&data=05%7C01%7CLeslie.karsten%40dot.gov%7C3ac5799f2c0c41234c2908dae82032b2%7Cc4cd245b44f04395a1aa3848d258f78b%7C0%7C0%7C638077522247549464%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=Igr4u7Hud3L9fCH%2BNue8rYDerm0ndd%2B%2BpG2Tz3X%2Fzeg%3D&reserved=0

Is that Pacific Standard Time or Mountain Standard Time?

7 IFB Page 4, under Project Overview it indicates the project is within lands owned by the National Park Service (Golden Gate National Recreation Area) and the City of San Francisco.

a. Please clarify which portions of the project are located on land owned by the NPS vs. land owned by the City of San Francisco.

b. Please clarify the permits that will be required as it pertains to portions of the land that are owned by the NPS

vs. the City of San Francisco.

a. The portion of the project in the City of San Francisco are the utility connections/utility trenching and patching on Sheets U2/U3 and asphalt noted on Sheets T8/T9 in Sea Cliff Avenue. The property/ROW line is the delineation between NPS property and City of SF property. The area indicated on sheet D8/U1 in Sea Cliff Avenue between the property line and the heavy black dashed line.

b. Side sewer permit and general excavation permits are through the City of San Francisco for the utility connection and trench backfill and patching in Sea Cliff Avenue. The Side Sewer Permit is for the sanitary connection and the General Excavation Permit is for domestic water, fire protection water, electric and telecommunication connections and associated trench patching.

State Permits include the NPDES permit.

8 On 12/22/2022 there was a document posted on sam.gov titled “QnA 12.22.22 China Beach”. Are we to acknowledge this document as Amendment 0001 on the SF1442?

No, you do not need to acknowledge QnA 12.22.22 as an amendment. Any amendments will be on a Standard Form 30, and will be titled “A00X.” QnA 12.22.22 and any further QnA documents posted are questions and answers for clarification.

9 IFB Page A-3, Item 8 states “Location of Public Bid Opening”. Will there be a public bid opening for this project? If so, please provide information on how bidders can participate.

Yes, you may attend in person at the address listed in Item 8 on the SF1442 (Sheet A-1). The address is:

Central Federal Lands Division Office 12300 W. Dakota Ave.

Lakewood, CO 80228

10 Reference Appendix A, Golden Gate National Recreation Area Fire Management Step-up Plan: Under the “Actions” column it lists Optimal Staffing requirements. Please confirm that firefighter staffing is not the Contractor’s responsibility.

Firefighting staffing is not the responsibility of the Contractor.

11 Can you please provide the chain link fence height for bid item #A1440? The details state that the fabric height is 36” to 96” but I’ll need something a bit more specific than that in order to properly bid the fence (and gate).

Fencing is a standard 6’ height however the height varies with the fence sections being level.

Sheet D26 notes a 6’ fence with the difference between two elevations. Sheet T2 profiles the fence, showing the 6’ height, but the fences remain level along the slope giving a non-standard height along the slopes.

I have a scree clip of the profile below.

12 With several people out of the office during the recent holidays, and with the disruptions caused by the recent and ongoing severe weather, our prospective key subcontractors, such as the soil nails subs, are just starting to look at the bid documents for this project.

We are concerned that we will not be able to obtain good, solid numbers in time for a January 12 bid.

Because of this, we respectfully request an extension of two weeks to enable us and all bidders to put together their best competitive bids for you

We will extend the bid opening date by 1 week. Please refer to Amendment A001.

13 In my attempts to resource a wire mesh product for your project, I’ve found the

The ‘Elite’ System from Omega is what our details were loosely based on (refer to the last page of QnA for the Elite system from Omega). Fence profiles provide a design (refer to three attached premanufactured possibilities (much more cost effective then having to custom fabricate the panels).

Will any of the three attached options suffice for this project?

plan sheet T2 for example). The suggested prefabricated fence panels will require modification to irregular shapes along the slope to maintain a level top of fence. The Contractor will need to provide shop drawings for review prior to construction.

14 Do you have bid form?

Yes, refer to sheets A-7 thru A-14 of the Invitation for Bid for the Bid Schedule.

15 Are we mounting the monument signs on a hard surface or a soft surface?

The Kiosk, Detail Sheet T16 Special 633-B Kiosk, is mounted within concrete hardscape.

The Entrance Sign, Detail Sheet T15 Special 633-A Park Entrance Sign, is mounted in a softscape area.

16 Please clarify the design intent of the soil nail walls. The plans contain the following note:

It is our understanding the soil nails and concrete facing will be used to retrofit and stabilize the existing bin walls. As part of the design process when specifying the use of soil nail walls, it is the Owner’s responsibility to evaluate the overall global stability of the site geometry including slip surfaces that would extend beyond typical soil nail lengths. Please verify it is not the intent of the Contract to require the Contractor to perform the global stability analysis for the site. Based on the Geotech report, (Section 6.2.6) there may be a slope stability evaluation for the report, however we did not see it in the bid documents. Please provide the

The project is to retrofit and stabilize the existing retaining walls. The soil nails are to be designed to resist lateral earth pressures that are currently being resisted by the bin walls.

Neither the existing or nor proposed retaining wall systems are intended to enhance global stability. We are not aware of any evidence of global instability that has impacted the existing retaining walls. The retrofit should not have adverse impacts on global stability. The soil nails should be designed to resist lateral earth pressures only, and the global stability will be no better-no worse than currently exists.

Per Section 6.2 of our report:

6.2 CONTRACTOR DESIGNED SOIL NAIL WALLS

Soil nails will be used to retrofit and stabilize the existing bin walls (Wall Locations 1, 2, 3, and 4) along the access trail to China Beach. The contractor design for the new retaining walls should include the soil nailing and a new reinforced concrete facing and associated work necessary to stabilize the existing metal bin retaining walls and backfill. The retrofit will be designed to support lateral earth pressures from the soil both within and behind the existing bins.

slope stability evaluation and confirm this evaluation has assessed the overall site global stability. It is not the Contractor’s responsibility to evaluate the grading plan, existing slopes, and the stability of the slopes above and below the walls. Please confirm the Contractor’s only design responsibility is to evaluate the internal stability of each individual wall (ie. nail lengths, nail layout, bar sizes, and facing strength), while considering the provided soil strengths and slope geometry. Please confirm it is not the Contract intent to have the soil nail walls be designed to mitigate an overall global stability issue. See below for potential global stability issues that should be evaluated by the project

GEOR.

17 Section 259.11 Wall Construction, states “ Remove existing loose or corroded metal from the face of the existing wall that would interfere with the construction of the facing.”

a. Who will determine if the metal is loose or corroded?

b. Is the intent to remove all of the face of the existing bin walls in lifts and replace with a soil nail wall and an architectural concrete facing?

a. Contractor to identify loose and corroded metal. See amended SCR Section 259.11 in Amendment A003.

b. The intent is to remove lose and corroded areas of the existing bin wall face, not all of the face of the existing bin walls. See amended SCR Section 259.11 in Amendment A003.

18 Does the layout line for face of the new wall match existing bin wall face? If the face of the existing and new wall match, this would require the removal of the existing bin wall face to allow for soil nail shotcrete and architectural facing

The layout control line is the top of the existing wall. This is noted on Sheets G3, G4 and G7 Note #3 and Sheets G10 and G13 Note #5. The finished wall face line is not provided. The new wall will be built up from this face per plan and typical details and will be based upon the Contractor design and designed wall thickness. See amended SCR Section 259.12 in Amendment A003.

and not to encroach on exiting pathways. If only a portion of the existing bin wall will be removed, this may require extra shotcrete to cover the existing bin wall and encroachment on existing pathway. Please provide a line for finished wall facing.

19 How will the transition be handled between the sections of wall where existing bin wall panels are removed and where they are not removed, as this will affect the face of the new wall?

Fill voids as noted in Amended SCR Section 259.11. This will allow for a consistent existing wall face / control line. See amended SCR Section 259.11 in Amendment A003.

20 With the soil nail wall retaining wall being a lump sum item with a SQFT bid unit, how should voids or sloughing created from removal of existing panels be quantified or accounted for?

Design is lump sum with the bid quantity per square foot. Voids or sloughing is to be accounted for in the square foot cost for the walls as noted in amended SCR 259.11 in Amendment A003.

21 The Geotech Report prepared by Yeh and Associates, Inc. doesn't include the global slope stability analysis. The design of the soil nail wall doesn't cover the global slope stability check and the global slope stability analysis shall be performed by GEoR.

The project is essentially to retrofit and stabilize the existing retaining walls. The soil nails should be designed to resist lateral earth pressures that are currently being resisted by the bin walls. Neither the existing or nor proposed retaining wall systems are intended to enhance global stability. We are not aware of any evidence of global instability that has impacted the existing retaining walls. The retrofit should not have adverse impacts on global stability.

The soil nails should be designed to resist lateral earth pressures only, and the global stability will be no better-no worse than currently exists. See amended SCR Section 259.01 in Amendment A003.

Per Section 6.2 of the report:

6.2 CONTRACTOR DESIGNED SOIL NAIL WALLS

Soil nails will be used to retrofit and stabilize the existing bin walls (Wall Locations 1, 2, 3, and 4) along the access trail to China Beach. The contractor design for the new retaining walls should include the soil nailing and a new reinforced concrete facing and associated work necessary to stabilize the existing metal bin retaining walls and backfill. The retrofit will be designed to support lateral earth pressures from the soil both within and behind the existing bins.

22 The “Retaining Wall Detail” on page

U23 shows a 4” perforated line under all retaining walls. No perforated lines are shown to be installed in the utility drawings. Please identify where the perforated line is to be installed.

Wall drainage detail is not required and has been removed from the plan set. Revised Sheet U23 is included in the Amendment A003.

23 Electrical, Telecom, Sanitary Sewer, & Water services all tie into existing systems on Sea Cliff Ave. Per SFDPW Order No: 187005 excavations entering the public right of way require restoring the entire lane’s asphalt wearing course.

Will the proposed utility tie in require this? If so, will grinding and paving of the ACWS be paid for under the paving bid item?

Amended trench details on Sheet U30 align with SFDPW Order No 187005, asphalt patching for trenches for utility laterals, requiring patch 1’ beyond edge of trench. Revised Sheet U30 is included in Amendment A003.

24 Design Wall 4 has a guardrail in front of it that will not allow for installation of a soil nail wall. Please advise if the guardrail is intended to be removed and replaced. If it is to be replaced, please provide details on new guardrail installation. Additionally, the existing bathhouse building conflicts with the installation of design wall 4. The existing building and pedestrian catwalk will not provide enough clearance for equipment to install the wall. Please advise on how this wall is to be installed.

The existing handrail is to be removed within the limits of Wall #4 construction. The cost is incidental to the Wall #4 construction and not paid separately. See emended SCR 259.11 and revised Sheet G13 in Amendment A003.

25 Confirm the clear opening needed for the pedestrian rated wet well cover.

Also confirm if integral fall protection is required (safety grate).

Provide wet well cover with minimum clear opening of 22"x36" for pump removal and service.

Integral fall protection is not required.

26 Regarding Drawing U42 - Site Plan-

Electrical - Sheet Keynote 3 - Electrical Manhole MH-1 We are unable to locate a detail for MH-

1. Please provide a detail, including dimensions and weight for MH-1.

Response: Contractor shall take field measurements of existing manhole and match existing dimensions and weight. See revised SCR Section 636.04 in Amendment A003.

27 Regarding Drawing U42 - Site Plan - Electrical - Sheet Keynote 6 - Telecom Handhold Oldcastle We are unable to locate a detail for PB44 other than dimensions shown on site plan. Please provide a detail and weight for PB44.

Response: See attached for P44 cutsheet for box specifications. Item details have been added to SCR Appendix F. See revised SCR Section 636.04 and revised SCR Appendix in Amendment A003.

28 Regarding Drawing U42 - Site Plan Electrical - Sheet Keynote 7, Specification Section 363.06 and Appendix D - Pole Lights Please provide fixture schedule showing Type 1 and Type 4 Fixtures. We need a manufacturer and model numbers, as these appear to be two different fixture types Please provide pole details , including type and height.

Response: Manufacturer and model number is not provided the light is not to be sole-sourced. The Type 1 and Type 4 fixtures are the same fixture, but with different optics for light distribution. Both fixtures shall be the same and meet the performance requirements shown in SCR Section 636.06.

Response: Pole shall be a round pole, minimum 15’-0” length as shown in SCR Section 636.06.

29 It's mentioned on the plans colored concrete as per SCRs. Could you please advise us which color/finish per SCRs will use during the ready-mix concrete?

Please see below and advise.

Refer to SCR Section 501.01.a for use specialty product material finishes, “Craftsmen Non- Slip Large Ground Profile.” Refer to SCR Appendix B for Misc. Asphalt Material finish examples that note a warm light tan integral color to for both Type 1 and Type 2 finishes.

Elite Double Wire

ELITE Double Wire

Horizontal wire 2 x 4 GA

Vertical wire 1 x 6 GA

Mesh opening 2" x 8“ - c/c nominal

1.77” x 7.60” – average inside wires

Standard height 4', 6', 8'

Standard length 8' 3"

Square post 2“ x 2" or 3“ x 3"

Caps Aluminum Square

Opacity/Openness 13% / 87%

Finish Pre-galvanized & powder coated