B08_Att_13_Questions___Answers_140P8626R0003_REVISED_17_June_2026_0003.pdf

United States Department of the Interior

NATIONAL PARK SERVICE

CONTRACTING OPERATIONS - WEST

1849 C Street

NW Washington, DC 20240

140P8626R0003

Conlon Creek Culvert Removal & Restoration, GOGA

Question & Answers

REVISED 17 June 2026

Question 1:

Is the Recology dumpster at Nursery parking lot going to be present for the duration of the project

& what type of access needs to be maintained?

Answer 1:

Assume that the Recology dumpster will be present for the duration of the project. It gets removed and replaced on an ‘as-needed’ basis. It has been averaging around once a month. We will have our Facilities staff let us know in advance of a dumpster pick-up and replacement.

Question 2:

What is the average flow rate (cfs) of the tributary during the project period?

Answer 2:

We have not measured the flows quantitatively but would estimate that the tributary (Conlon

Creek) would either lack surface flow (but have isolated pools) or have a small “trickle” (less than

0.1 cfs) at the time of construction.

Question 3:

Is there water access on site or in the park?

Answer 3:

There are two hose bibs are located near the Park’s MUWO maintenance building. The facilities staff has indicated that limited use will be ok for this project although have not specified what that amount is. Water from Conlon Creek can be used for watering salvaged plants (See Section 01 51

00 - 2 TEMPORARY SERVICES of the plan specifications).

Question 4:

Are the soil piles contaminated and will they need to be tested?

Answer 4:

This now is a non-issue for the 220 cys soil pile that was pointed out at the June 4th, 2026, site visit. The Park has decided that that soil pile will be saved for re-use for another project.

However, any material generated by this project does not have sediment testing data.

Question 5:

What is the landscape fabric on the far side of the tributary?

Answer 5:

After the Conlon Creek culvert blew out in December 2015, the park initiated an emergency repair that included stabilizing the gully using Class II riprap underlain by plastic filter fabric. We will not use plastic filter fabric for any element of this project and any existing fabric should be removed and properly disposed of. Plan Sheet G0.3 Note 2 will be revised to include removal of existing fabric.

RFP 140P8626R00003 Conlon Creek Culvert Removal & Restoration

Questions & Answers REVISED 17 June 2026 Golden Gate National Recreation Area

Question 6:

A single tree on the right bank at the old road crossing that is marked for removal is tangled with another tree on the other bank and each seem to be supporting each other; will they be held liable if the second tree falls or gets damaged by the removal of the marked tree?

Answer 6:

The A/E design contractor made the determination that the tree would need to be removed for site access, safety and for installing rock bank protection. The plans indicate that the base of the tree is at the top of bank at Elev. 148 and that design plans maintain that elevation. The tree is a mature bay that we would prefer to maintain onsite alive. If the contractor feels that they can work around the tree without having to remove it, that solution is acceptable and preferred. However, if the marked tree needs to be removed, the contractor would not be held liable if the tree on the supporting bank falls or is damaged by removal of the marked tree.

Question 7:

Are there still people living in Druid Heights and is that community powered by the lines that move through the project site?

Answer 7:

There are separate PG&E power lines that service Druid Heights. The PG&E power lines onsite do not go to Druid Heights.

Question 8:

Are the power lines de-energized?

Answer 8:

PG&E response: the line is not deenergized, or rather even if the line is abandoned that we should assume it is energized until PG&E gets a lineman out to inspect. The contractor will be responsible for contacting PG&E. They can call PG&E's Business Customer Service Center at 1-

800-468-4743 to initiate a formal project request. Or if the contractor has an existing account with

PG&E, they can submit the request online here: Create An Account

Question 9:

Are they going to be able to trim back vegetation that is encroaching on old road for better access?

Answer 9:

Yes. However, the order of preference would be to temporarily pull and tie back branches where possible. If this is not possible, then the minimum amount of vegetation needed for access and safety can be trimmed. This is also detailed on the plan specifications (Section 01 45 00 - 11

ENVIRONMENTAL PROTECTION)

Question 10:

Can all removed woody materials be ground up and used for erosion control on site?

Answer 10:

Good question. We are deliberately using minimal erosion fabric and fiber rolls for erosion control onsite preferring to use existing duff in the project area that should be removed and temporarily stockpiled during the site preparation stage. Any limbs or other materials can be chipped and used for post construction mulch. However, large trunks that are not used for in-channel structures should be left intact and scattered throughout the site.

https://yourprojects-pge.com/activity-submit/wfi/20093707/1

Questions & Answers REVISED 17 June 2026 Golden Gate National Recreation Area

Question 11:

Are they expected to import rock to the site?

Answer 11:

Yes. However, imported rock needs to meet certain criteria. These criteria are found in SECTION

01 67 01 IMPORTED SOIL AND ROCK. The Park has evaluated sediment quality for a variety of local vendors and those vendors and rock types which are acceptable are also provided in this section.

Question 12:

Can they use the rocks piled up on site?

Answer 12:

No. The rock stockpile shown on Sheet G0.4 (Site Access & Staging construction drawings) and pointed out in the field is intended for another use. There may be some reference in the plan specifications that allow for use of backing rock. This was left in error and would be removed.

Question 13:

Can you clarify the removal of the sediment wash basin?

Answer 13:

Yes. The sediment wash basin/basin pond was mistakenly left in the final design plan (Sheet G0.4 and C1.4), The graphics related to the sediment basin pond should be removed. The related Note

2 about cleaning the sediment trap will be removed as well.

Question 14:

Will there be cleanliness inspections of the equipment on site?

Answer 14:

Contract Line-Item No. 001 – Mobilization and Demobilization requires that any equipment and tools be washed prior to bringing into the Park. The level of inspection is up to the discretion of the Park. Any evidence of grossly ‘dirty’ equipment and tools would result in their rejection and request to clean outside the Park.

Question 15:

Will there be construction site access outside of the creek (e.g., does the creek need to be used as construction corridor)?

Answer 15:

Yes. The contractor will be required to prepare a simple access plan that would detail access corridors that would minimize natural resource impacts. Conlon Ave is a serviceable road for vehicles and heavy equipment.

Question 16:

For the onsite trees that are shown to be protected, will there be orange construction fencing around them?

Answer 16:

The specifications noted that “Trees and shrubs that are identified to be protected will be clearly marked with fencing or flagging” The contractor will have discretion to use either of the two marking options (Plan specs Section 01 45 00 - 11 ENVIRONMENTAL PROTECTION). The spatial limits of protection will be determined jointly onsite by the contractor and COR.

Questions & Answers REVISED 17 June 2026 Golden Gate National Recreation Area

Question 17:

What rate will the Park Service charge for water drawn from on-site hydrant?

Answer 17:

There will be no charge for water drawn from either of the two hose bibs at the Muir Woods maintenance facility for watering use (no more than 200 gallons/wk). Also, the contractor will be able to fill a 500-gallon water buffalo for stand-by fire protection use only.

Question 18:

Bid Option C. Import Rock for Engineered Streambed Material. Does bid item No. 004 include the Engineered Streambed Material shown on C1.2 and Bid Option C is additional Engineered

Streambed Material?

Answer 18: Sorry for the confusion. A total of 80 cys are needed for Engineered Streambed

Materials. Bid item No.004 does include the Engineered Streambed Material shown on C1.2 and

Bid Option C was our attempt to cover shortages in recycled on-site streambed materials (See

Section 31 05 16 - 3 ROCK WORK in plan specifications) with outside rock. Based on our pre-bid visit, it looks like the current channel is at a lower grade than when topographic surveys were done a few years ago.

Question 19:

Fiber Rolls are mentioned in the scope of work, however, there do not appear to be any shown on the plans. Please Verify that Fiber Rolls are Required.

Answer 19:

The original plans and specifications had fiber rolls proposed. We have removed that element from the design but had forgotten to remove that element from the scope. You can disregard all mention of fiber rolls.

Question 20:

Are all underground Utilities abandoned thus being able to remove them where they are encountered and cap the ends or will there be a need to hire a utility locator to preserve the utility lines?

Answer 20: We think that any underground utilities are abandoned and any encountered conduits should be capped as noted. However, the contractor should follow the details about locating utilities that are in Section 01 71 23 - 1 FIELD ENGINEERING AND LAYOUT of the plan specifications.

Question 21:

The Demolition plan sheet G0.3 calls out the removal of two concrete headwalls and one Rock headwall; however, note 4 calls out the removal of the existing two concrete headwalls. Can you please verify the quantity of headwalls needing to be removed for estimating purposes.

Answer 21:

There are two concrete headwalls and one rock headwall requiring removal and disposal. There may be poured concrete securing the metal trash rack that should be removed with the trash rack.

We revised Note 4 to read “4. Remove and dispose of headwalls offsite (3 each)”

Question 22:

Is the overhead utility line that is attached to the tree called out on plan sheet C1.1 de-energized?

Answer 22:

See Answer to Question 8.

Questions & Answers REVISED 17 June 2026 Golden Gate National Recreation Area

Question 23:

Will the project require a bio-monitor or tribal monitor and who will be responsible for acquiring services if needed throughout the project duration?

Answer 23:

The project will require a biomonitor during any dewatering and initial ground disturbance activities. The park will provide biomonitoring support. There will be no need for a tribal monitor.

Question 24:

Is there a local water source available for fire suppression equipment nearby or on the project site?

Answer 24:

See answer to Question 17.

Question 25:

Is the awarded contractor responsible for providing a water meter for hydrant use and paying for water, or does the client supply water at no cost to the contractor?

Answer 25:

See answer to Question 17. We don’t anticipate a need for access to large quantities of water. If this changes, the contractor needs to contact the CO

Question 26:

Can you Please provide a Class V-VIII RSP gradation table so that contractors can order the correct amount of each rock species for the mix desired by the engineer.

Answer 26:

A rock graduation table (Caltrans) is provided in Section 31 05 16 - 3 ROCK WORK of the plan specifications.

Please note that the design plans and specifications call for nine 48” diameter rock for placement in the rock ramp to roughen the surface and make it easier for adult steelhead to swim up the ramp under high flows (Sheet C1.2). Unfortunately, it does not look like the volumes are listed in the

Quantities section of Sheet G0.2.

Questions & Answers REVISED 17 June 2026 Golden Gate National Recreation Area

Question 27:

Can rock mix be rounded and smaller than 2” and angular for larger rock?

Answer 27:

Yes. Angular rock for weirs will aid in their stability over rounded rock.

Question 28:

Section 01 11 00-3 Summary of Work Part 1.2 A states that NPS has an existing stockpile of riprap and backing rock (class 1-2). The section states that contractors can use the backing rock currently stockpiled. Can the awarded contractor use the rip rap stockpiled and called out on plan sheet G0.2

Legend and Notes Construction Drawings?

Answer 28:

No. The Park made a recent change after the pre-bid site visit to retain all stockpiled rock and soil for future Muir Woods facility repair and rehab work. Language in the plans and specs that refer to use of stockpile rock will be removed.

Question 29:

Can the contractor use wood wedge stakes made from 2 x 4 lumber instead of the 12” Eco-Stakes to secure the erosion control matting along the top of the banks called out on the Details

Construction Drawings sheet C1.4?

Answer 29:

Yes

Question 30:

Is the current dewatering system called out on plan sheet C1.1 Proposed Conditions Construction

Drawings sufficient for contractors to maintain the project site during construction activities or is the stream expected to be dry?

Answer 30:

The dewatering system described in C1.1 is what the A/E contractor had proposed should flowing water be present throughout the worksite. Based on our recent pre-bid site visit, it is likely that there will be just a trickle (<0.1 cfs) or subsurface flows. In this scenario, occasional sumps and trash pumps may be sufficient to keep the project area dry enough to work. The contractor will still be required to install and maintain fish screens at the upstream and downstream project limits in case of a storm event during construction.