Amendment 0001 -GMNF Bridge Replacement Q and A Document.pdf

Green Mountain National Forest FR10-6.9 Bridge Replacement - 12445521R0002 Questions & Answers Document

1. What bid item should we use to cover the costs of dewatering?

Answer: See General Note 11 on Sheet C-02. This work shall be considered incidental to all contract items.

2. General note # 51 A is this tolerance correct? or should it be 1 inch instead of 1 foot.

Answer: Spacing tolerance shall be +/- 1”

3. Can we use rip-rap from Wallingford Crushed Stone?

Answer: Riprap from this supplier may be acceptable as long as it meets the specifications. Riprap on the plans call for 1’-0” grubbing material to be placed over the top of it, see Sheets C-03 and C-04.

4. Can you possibly tell me what type of bridge currently exists at the site, and do you by chance have any photographs of the existing bridge that you could share?

Answer: The existing bridge is a concrete slab. See the pictures below.

5. Also, do you know how far of a hike (or snowmobile ride) it would be to get to the bridge from the end of the maintained portion of roadway?

Answer: the distance on FR 10 from the end of where the town maintains the road on the Mt. Tabor side is approximately 6 miles. Coming from the Landgrove side is approximately 7.5 miles.

6. Is the site accessible by vehicle?

Answer: The road is closed from December 15th to May 1st. Site is accessible by foot or by snowmobile.

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7. Is the contractor safe to assume that the bridges to access the site are load rated for loaded concrete trucks, cranes, equipment etc.? The crane required to set the planks is approximately 139,000lbs spread over 5 axels.

Answer: No, if the Contractor proposes to use equipment that exceeds the Forest Service bridge ratings below, then they shall submit an overload permit request. The site may be accessed from the west from Mt. Tabor or the east from Landgrove. Also, the Contractor will have to coordinate with the applicable jurisdiction for Town or State bridges.

o Forest Road 10 Bridge at milepost 0.953 is open to Vermont Highway Legal Loads o Forest Road 10 Bridge at milepost 3.095 is rated for 24 tons o Forest Road 10 Bridge at milepost 3.143 has the following ratings:

Type 3 = 17 tons, Type 3S2 = 28 tons, Type 3-3 = 37 tons o Forest Road 10 Temporary Bridge at milepost 8.40 is open to

Vermont Highway Legal Loads

8. Is the contractor allowed to widen / modify the access road as needed to allow for material & equipment deliveries?

Answer: Any proposed improvements to the road, outside of the contract plans, shall be reviewed and approved by the COR. The Contractor shall be responsible for all costs associated with road improvements.

9. Is the stream allowed to be redirected or altered during demolition and construction of the new bridge to direct flows away from project via temporary culvert or an open stabilized stream channel?

Answer: See General Note 11 on Sheet C-02.

10. Were there any boring logs done for this project showing bedrock depths?

Answer: Yes, see attached boring log information.

11. Will the awarded contractor be provided the CAD & DWG files upon request?

Answer: Yes

12. Spec section 552 See table 552.1 says it is all 4500 psi concrete just aggregates are different. Drawing C-02 Note 22 says sub-footing is 3000psi class C per 552. Note 30 says 3500psi in abutments and footings? Note 65 says the overlay is 5000psi. There is an overlay section 569 should we use that? What strength concrete do we use?

Answer: Concrete compressive strengths noted on Notes 22, 30 and 65 are correct.

13. Can material be stockpiled on site for haul out later or backfill. Can material be spread on site and topsoiled and seeded or does it need to be hauled off. Is there a dump site?

Answer: Material may be stockpiled on site at locations approved by the COR for haul out later or backfill. See General Note 8 on Sheet C-02.

14. Spec Section 109.02 says Contract quantities are only adjusted when there are errors of more than 15%. Contract quantities not all right. Do we use the quantities on the bid form to come up with a per foot or cy price and adjust to right quantities if we get job or do we put the total estimated cost for the job as drawn and use the per foot or cy prices for any changes that come up?

Answer: Contract quantities are per the Schedule of Items.

15. Spec Section 157.09 Says we may use a temporary culvert pipe to cross stream? Can this be done to build a road so we can go back and forth across the stream. Do we need a temporary road across the stream while constructing the bridge for others access?

Answer: See General Notes 11 & 70 on Sheet C-02. The road will be closed at this location during construction and no temporary road access is required for others.

16. Spec Section 104.05 says do not exceed load ratings on bridges and roads.

What is the load rating on the steel bridge that crosses Big Branch stream?

The two concrete bridges that cross Big Black brook are under rated for concrete trucks, precast plank delivery truck and trailer and the crane required to set the concrete plank. Do we need to build roads with temporary culverts in order to get the vehicles in there and bypass the bridges?

Answer: If the Contractor proposes to use equipment that exceeds the Forest Service bridge ratings below, then they shall submit an overload permit request.

• Forest Road 10 Bridge at milepost 0.953 is open to Vermont Highway Legal Loads

• Forest Road 10 Bridge at milepost 3.095 is rated for 24 tons

• Forest Road 10 Bridge at milepost 3.143 has the following ratings: Type 3 = 17 tons, Type 3S2 = 28 tons, Type 3-3 = 37 tons

• Forest Road 10 Temporary Bridge at milepost 8.40 is open to Vermont Highway Legal Loads

KEY TO THE NOTES & SYMBOLS

Test Boring and Test Pit Explorations

All stratification lines represent the approximate boundary between soil types and the transition may be gradual.

Key to Symbols Used:

w - water content, percent (dry weight basis) qu - unconfined compressive strength, kips/sq. ft. - laboratory test Sv - field vane shear strength, kips/sq. ft.

Lv - lab vane shear strength, kips/sq. ft.

qp - unconfined compressive strength, kips/sq. ft. – pocket penetrometer test O - organic content, percent (dry weight basis) WL - liquid limit - Atterberg test WP - plastic limit - Atterberg test WOH - advance by weight of hammer WOM - advance by weight of man WOR - advance by weight of rods HYD - advance by force of hydraulic piston on drill RQD - Rock Quality Designator - an index of the quality of a rock mass.

T - total soil weight B - buoyant soil weight

Description of Proportions: Description of Stratified Soils

Parting: 0 to 1/16” thickness Trace: 0 to 5% Seam: 1/16” to ½” thickness Some: 5 to 12% Layer: ½” to 12” thickness “Y” 12 to 35% Varved: Alternating seams or layers And 35+% Occasional: one or less per foot of thickness With Undifferentiated Frequent: more than one per foot of thickness

REFUSAL: Test Boring Explorations - Refusal depth indicates that depth at which, in the drill foreman's opinion, sufficient resistance to the advance of the casing, auger, probe rod or sampler was encountered to render further advance impossible or impracticable by the procedures and equipment being used.

REFUSAL: Test Pit Explorations - Refusal depth indicates that depth at which sufficient resistance to the advance of the backhoe bucket was encountered to render further advance impossible or impracticable by the procedures and equipment being used.

Although refusal may indicate the encountering of the bedrock surface, it may indicate the striking of large cobbles, boulders, very dense or cemented soil, or other buried natural or man-made objects or it may indicate the encountering of a harder zone after penetrating a considerable depth through a weathered or disintegrated zone of the bedrock.

Job No.

Date:

19-0381 07/02/2019

Scale Sheet

1" = 40'

EXPLORATION LOCATION PLAN

EIV TECHNICAL SERVICES

FOREST ROAD 10-6.9 BRIDGE REPLACEMENT

SEASONAL FOREST ROAD 10

MOUNT TABOR, VERMONT

@A

@A

B-1

B-2

NOTES:

1. EXPLORATION LOCATION PLAN WAS PREPARED FROM

IMAGERY FROM VERMONT CENTER FOR GEOGRAPHIC

INFORMATION ENTITLED VCGI COLOR IMAGERY SERVICE.

2. THE BORINGS WERE LOCATED IN THE FIELD BY

RECREATIONAL GRADE GPS OBSERVATIONS BY S. W. COLE

ENGINEERING, INC.

3. THIS PLAN SHOULD BE USED IN ONJUNCTION WITH THE

ASSOCIATED S. W. COLE ENGINEERING, INC. GEOTECHNICAL

REPORT.

4. THE PURPOSE OF THIS PLAN IS ONLY TO DEPICT THE

LOCATION OF THE EXPLORATIONS IN RELATION TO THE

EXISTING CONDITIONS AND PROPOSED CONSTRUCTION AND

IS NOT TO BE USED FOR CONSTRUCTION.

LEGEND

@A APPROXIMATE BORING LOCATION