guanella A002.pdf

mcgehee Typewritten Text mcgehee Typewritten Text

I-59

CO PFH 80-2(3)

Guanella Pass Road

AMENDMENT A002

REVISED 04/17/08

9:00 a.m. to 11:00 a.m. and from 1:30 p.m.to 3:30 p.m.on Tuesday, Wednesday, and Thursday of each week during periods of major construction activity, except during the aspen viewing season (assumed to be the last two weeks in September and first week of October). For delays longer than 30 minutes, public notice will be given in advance through the local news media and by informational signs. Allow 48 hours prior to the planned delays for the CO to evaluate the closure need and notify the necessary parties.

Nighttime closures, from 10:00 p.m. to 6:00 a.m., will be allowed provided all restrictions in Section 108 are followed.

Keep the road open on weekends, without construction delays, from 6:00 p.m. Friday to 11:00 p.m. Sunday and on National holidays.

Temporary roads through construction areas will be allowed with a maximum grade of 12%.

(j) Add the following:

Limit the length of area affected as approved by the CO. See Subsection 108.01 for limitations on work.

(k) Add the following:

Notify the CO of all construction activities (including construction hauling, road closures of greater than 30 minutes, extended traffic delays, timing of construction, etc.) that may affect the Town of Georgetown, Clear Creek County, Park County, and business and property owners along Guanella Pass Road. Provide updated notification to the CO on a daily basis, from Memorial Day through Labor Day, and weekly basis the rest of the year. Provide notification at least 48 hours in advance of the operations. Any limited hauling activities occurring between Memorial Day and Labor Day will be coordinated to avoid conflicts, as much as possible, with business activities along the road.

(l) Add the following:

Provide immediate passage through the construction area for all Cabin Creek Hydro Plant personnel in the event of an emergency involving the Cabin Creek Hydro Plant and at times of regular shift changes for the Cabin Creek Hydro Plant. The current shift change schedule for the Cabin Creek Hydro Plant is as follows: 6:30 a.m. to 8:00 a.m. and 6 p.m. to 7:30 p.m.

Contractor shall be notified of any changes in the shift schedule during the term of the project.

156.08 Traffic and Safety Supervisor.

Delete the first paragraph and substitute the following:

Provide a traffic and safety supervisor whose primary responsibility is traffic maintenance and safety and who is certified by the State highway agency or other acceptable certification

I-73

Guanella Pass Road

AMENDMENT A002

REVISED 04/17/08

205.05 Blasting Plans. Add the following:

(c) Typical plan for drilling and blasting of boulders.

205.08 Blasting.

(a) General. Add the following:

Nitroglycerin materials, safety fuse and fuse caps will not be allowed.

When blasting boulders, mudcapping will not be allowed. Drill and load explosives into the core of the boulder.

Measurement

205.11 Delete the second paragraph and substitute the following:

Measure only drilling and blasting of boulders on existing slopes as directed by the CO. Do not measure any other drilling and blasting for direct payment.

Section 270. – INJECTED GROUT

Delete the text of this Section and substitute the following:

Description

270.01 This work consists of injecting low pressure grout into voids at the Rock Bolt Retaining Wall area, Station 31+490 to 31+530.

Material

270.02 Conform to the following Subsections:

Grout 722.02(e) Hydraulic cement 701.01 Water 725.01(a)

Construction Requirements

270.03 Composition of Mix. Design a well-graded, pumpable, mix conforming to Section 722.02(e). Submit test results conducted according to AASHTO T 106 and supplied by a qualified testing lab verifying grout 3-day and 28-day compressive strengths. Previous test results for the same grout mix completed within one year of grouting are acceptable.

Furnish grout capable of reaching a cube strength of 10.5 megapascals in 3 days and 21 megapascals in 28 days.

I-73A

Guanella Pass Road

AMENDMENT A002

REVISED 04/17/08

270.04 General. Perform the work described under Section 260. Furnish all supervision, labor, materials, transportation and plant; all grouting materials and other supplies; all operations and equipment to supply, transport, store, mix and pump grout materials for the purpose of achieving the grouting plan as presented in the plans and specifications 270.05 below. or as amended by the CO during construction. Monitor the work to insure that damage will not occur to any existing structure due to the grouting processes.

270.05 Mixing and Placing Injected Grout. Mix grout by to obtain a uniform mix.

Place injection grouting following the construction of the Rock Bolt Retaining Wall and prior to the construction of the sculpted shotcrete finish. Inject the grout through block-outs or grout tubes though the construction shotcrete facing.

Place injected grout in a manner that does not float or shift the structure.

When placing injected grout at or below an atmospheric temperature of 2 ºC, perform the work under Subsection 552.10(a).

Apply lock-off load to the Rock Bolts after grout has reached the 3 day compressive strength.

270.06 Acceptance. Material for injected grout will be evaluated under Subsections 106.02 and 106.03.

Construction of the injected grout will be evaluated under Subsections 106.02 and 106.04.

270.07 Measure the Section 270 items listed in the bid schedule according to Subsection 109.02 and the following as applicable.

Measure injected grout by the cubic meter complete in place.

Payment

270.08 The accepted quantities will be paid at the contract price per unit of measurement for the Section 270 pay item listed in the bid schedule. Payment will be full compensation for the work prescribed in this Section. See Subsection 109.05.

I-73B

Guanella Pass Road

AMENDMENT A002

REVISED 04/17/08

Section 208. – STRUCTURE EXCAVATION AND BACKFILL

FOR SELECTED MAJOR STRUCTURES

208.13 Delete the text of this Subsection and substitute the following:

Measure the Section 208 items listed in the bid schedule according to Subsection 109.02 and the following.

Measure foundation fill by the cubic meter in place for rockery walls and MSE walls (where placement is directed by the CO). Limit the volume measured to that placed inside vertical (and sloping) planes as shown on the drawing details. Use these planes to determine pay quantities regardless of the amount of material placed outside these planes.

Measure temporary shoring by lump sum for each individual retaining wall. Measure temporary shoring only for shoring required to maintain one 3 meter lane plus temporary barrier.

Do not measure foundation fill at concrete walls for payment.