CSI_Specifications_-_Midgely_Bridge_Toilet_Project.docx

CSI SPECIFICATION INDEX

FOR

Coconino National Forest Red Rock Ranger District Midgely Bridge Toilet Installation

END OF SPECIFICATION INDEX

DIVISION 1 - GENERAL REQUIREMENTS

01010 – SUMMARY OF WORK

PART 1 - GENERAL

1.1 – Location

This project is located at the Midgley Bridge Observation site. This site is located on Hwy 89A approximately 30 miles south of Flagstaff and 1.5 miles north of Sedona.

1.2 – General

1. All work shall be completed in accordance with project specifications and construction drawings. The work includes all labor, material, and equipment necessary to perform all the operations for the work specified herein and as stated in the construction drawings.

2. The purpose of this project is to place a new toilet facility for public use at the Midgley Bridge observation site, provide a firm and stable access path, refurbish existing gate and relocate 1 existing trail sign.

The Contractor shall be responsible for any necessary site investigations, detailed and accurate material lists, and all field measurements necessary in order to complete the construction and placement of the toilet building.

3. The drawings which accompany this project are meant for reference and bidding purposes only. Although the requirements of these drawings are binding, the plans and elevations shown on them are not meant to be relied upon for construction.

It is anticipated that the Contractor will field measure existing items and field fabricate the replacement items on-site to the greatest extent possible in order to ensure accuracy and minimize fabrication errors.

1.3 – Description of Work

A. Work under this contract will be as follows:

a) Excavation, preparation and backfill of vault hole.

b) Preparation and compaction of vault hole bedding.

c) Excavation and placement of accessible path

d) Refurbish existing gate

1.7 – Examination of Sites

A. Bidders are encouraged to visit the site, compare the drawings and specifications with any work in place, and inform themselves of all conditions, including other work, if any, being performed. Failure to visit sites will in no way relieve the successful bidder from the necessity of furnishing any materials or performing any work that may be required to complete work in accordance with drawings and specifications, without additional cost to the Government.

B. Information regarding the site of the work provided in drawings or specifications is believed to be reasonably correct, but the Government does not warrant either the completeness or accuracy of such information, and it is the responsibility of the contractor to verify all information independently and to make other examinations of the conditions to be encountered during construction.

C. The contractor acknowledges that he/she has investigated and satisfied himself/herself as to the conditions affecting the work, including, but not restricted to, those bearing upon transportation, disposal, handling and storage of materials, availability of labor, water, electric power, roads, and conditions of the ground, the character of equipment and facilities needed prior to and during prosecution of the work. The contractor further acknowledges that he/she is satisfied as to the character, quality, and quantity of surface and subsurface materials or obstacles to be encountered insofar as this information is reasonably ascertainable from an inspection of the site. Any failure by the contractor to acquaint himself/herself with the available information will not relieve him/her from the responsibility for estimating properly the difficulty or cost of successfully performing the work. The Government assumes no responsibility for any conclusions or interpretations made by the contractor based on the information made available by the Contracting Officer’s Representative.

1.8 – Timing of Work

Work under this contract is scheduled to begin April 1, 2013. No restrictions are placed on weekend work.

The time to complete the work and all associated payments in this contract is set to be completed no later than April 30, 2014.

1.09 – Government – Furnished Facilities

The site is available to the Contractor for staging and storage during the project. Any damage resulting from the Contractor’s use of the sites will be repaired or replaced at the Contractor’s expense at the direction of the Contracting Officer’s Representative.

Electricity and water are not available. Cell phone operation may be possible at the site. All temporary services and use areas shall be completely removed and the areas restored upon completion of use. Transportation to and from the work site for the Contractor's personnel and materials will be provided at the Contractor's expense.

1.10 – Government – Furnished Products

The toilet will be government-furnished and delivered to the construction site. The toilet is manufactured by CXT Precast, Spokane, Wa. (1-800-696-5766). Contractor is responsible for contacting CXT and coordinating delivery and traffic control.

1.11 – Material Sources

A. All materials shall be obtained from commercial sources unless noted otherwise. Materials referred to by trade name, make, or catalog number shall be regarded as establishing a standard of quality; substitutions of equal quality can be made by submitting a data sheet of the proposed substituted item to the Contracting Officer’s Representative, for approval.

1.12 – Clean up and Disposal

A. Waste accumulation in approved containers and material staging is allowed at the site. Disposal of waste material will be off National Forest Land and in compliance with local, state, and federal laws regarding disposal of construction waste. Before final acceptance of the project by the Government, the Contractor shall remove from Government land all waste materials and rubbish resulting from this work.

B. Clean excavated material shall be hauled to Forest Service pit located of FSR 525 approximately 13 miles from the site.

1.13 – Precautionary Measures

A. Protection of Work: The Contractor shall take precautions to protect all work during the construction period. The Contractor shall provide and maintain adequate protection during the course of the work to ensure the public does not tamper with or vandalize any equipment or project work.

B. Safety: The Contractor is responsible for safeguarding employees, public, existing facilities, and forest resources from his/her operations. All operations shall comply with the requirements and restrictions of OSHA, the Arizona Occupational Safety and Health Code, and the Workman’s Compensation Board. The Contractor shall erect signs and barricades to make unguarded operations safe as required. Signs and barricades shall be maintained at night and on weekends. Precautions such as safely storing materials shall be practiced to prevent injury to others in the area.

C. Security: Security is not provided by the Government. The Contractor shall take all precautions deemed necessary to secure the worksites, improvements and equipment. This may include security fencing at the Contractor’s discretion.

1.14 – Applicable Codes and Standards

All work shall conform to the latest editions of the American Welding Society Code, the American Institute of Steel Construction, the Forest Service Accessibility Guidelines, and all OSHA regulations. All environmental codes shall be adhered by the Contractor.

1.15 – Subsurface Soils and Investigations

No auger boring tests were made in the area. Under supervision of the Engineer, the Contractor shall undertake any site investigations necessary to ascertain subsurface conditions.

END OF SPECIFICATION 01010

01030 – NOXIOUS WEED CONTROL

PART 1 - GENERAL

1.1 – Description

This work consists of incorporating weed prevention and control within the project site. The Contractor shall prevent new weed infestations and the spread of existing weed infestations within the project site as specified herein.

PART 2 - PRODUCTS

None.

PART 3 - EXECUTION

3.1 – Equipment

The Contractor shall ensure all equipment brought onto the Forest is thoroughly washed/cleaned in order to remove all soil, vegetative matter, and other debris prior to entering the forest. Particular attention shall be given to the under carriage and any other surface where soil containing weed seed and propagules may exist. All equipment shall be inspected by the Forest Service. Only construction and maintenance equipment, and the equipment necessary to transport said equipment shall be allowed to operate within the project area after it has been cleaned by the Contractor and inspected by the Forest Service. All subsequent move-ins of equipment to the project area shall be treated in the same manner as the initial move-in.

The Contractor shall employ cleaning methods, approved by the Forest Service, to ensure that construction and maintenance equipment is free of noxious weeds. Equipment shall be considered free of soil, seed, and other such debris when a visual inspection does not disclose such material. Equipment or component disassembly, or the need for specialized tools, are not required.

Unless otherwise agreed, the Contractor shall give the Forest Service at least 24 hour notice when equipment is ready for inspection. Notification will include an agreed upon location where the equipment will be available for inspection by the Forest Service. Inspection will be required after every cleaning.

3.2 – General Project Work

The Contractor shall minimize soil surface disturbance wherever possible.

New infestations of noxious weeds of concern to Forest Service and identified by either Contractor or Forest Service, on the project site or on haul routes the Contractor plans to use, shall be promptly reported to the other party. Contractor and Forest Service shall agree on treatment methods to reduce or prevent the spread of hazardous, invasive, and noxious plant species when new infestations are found. A current list of hazardous, invasive, and noxious plant species is available at each Forest Service office. A copy of this list as well as the Forest Service’s Best Management Practices will be submitted to the contractor.

A Noxious Weed Summary (“standards and guides”) will be submitted to the Contractor by the Government providing information about hazardous, invasive, and noxious plant species that may be encountered at the project sites or haul roads.

PART 4 - MEASUREMENT AND PAYMENT

4.1 – Measurement

There will be no separate measurement of this item.

4.2 – Payment

This work is incidental to other items in the contract and direct separate payment will not be made.

END OF SPECIFICATION 01030

01103 – MEASUREMENT AND PAYMENT

PART 1 - GENERAL

1.1 – Requirements:

Measurement and payment for contract work will be made only for and under those pay items included in the SCHEDULE OF ITEMS. All other work and materials will be considered incidental to and included in the payment of the pay items in the SCHEDULE OF ITEMS.

1.2 – Measurement Terms and Definitions:

Unless otherwise specified, the following terms are defined as follows:

Each. One entire unit. The quantity is the actual number of units completed and accepted.

Linear foot. As applicable, measure the work along its length from end-to-end; parallel to the base or foundation; along the top; along the front face; or along the invert. Do not measure overlaps.

Lump sum. Do not measure directly. The bid amount is complete payment for all work described in the contract and necessary to complete the work for that item. The quantity is designated as "1." Estimated quantities of lump sum work shown in the contract are approximate.

Square yard. 9 square feet. Longitudinal and transverse measurements for area computations will be made horizontally. No deductions from the area computation will be made for individual fixtures having area of 9 square feet or less.

1.3 – Units of Measurement

Payment will be by units defined and determined according to U.S. Standard measure.

END OF SPECIFICATION 01103

MOBILIZATION – 01200 24

01300 – SUBMITTALS

PART 1 - GENERAL

1.1 – Requirements

It will be the Contractor's responsibility to submit all items with such promptness as to cause no delay in the work. Approvals must be obtained before starting work which involves the item. Contractor shall allow ten (10) days for processing of submittals by the Government.

Submittals may also be referred to as SHOP DRAWINGS.

1.2 - Manufacturer's Literature and Shop Drawings

Submit two (2) copies to the Engineer for approval on the items required herein.

Submittal specifications are to be submitted in the following format:

A. The specifications and salient qualities of the item specified in the contract.

B. The specifications and salient qualities of the submittal item.

C. A listing of the differences and a comparison between the two, including but not limited to the structural qualities, operational qualities, any modifications necessary to accomplish installation of unit, and guarantee and warranty.

D. A cost comparison between the specified and submitted item(s) with the cost reduction benefit to the government or adequate justification for a cost increase to the government.

E. Shop drawings of submitted item(s) including wiring or layout diagrams.

If there are any modifications necessary to facilitate installation, a set of drawings showing installation of specified item and a set showing how the submittal item will be installed shall be submitted to the C.O.R.

If the specified item is to be accessible, the submittal item needs to meet current Americans with Disabilities Act Accessibility Guidelines (ADAAG) or Forest Service Accessibility Guidelines and show to be installed for accessibility on submitted drawings, not just state it is available as accessible.

Submittals will be waived if Contractor furnishes exact item used for design when manufacturer's model, size, etc. are shown in the contract.

Submittals are required per the following sections:

1. 02090 – Blasting Plan

Other required submittals include all those as specified in the referenced Forest Service Specifications for this project.

END OF SPECIFICATION 01300

DIVISION 1-GENERAL REQUIREMENTS

01500 – TEMPORARY FACILITIES AND CONTROLS

PART 1 – GENERAL

1.1 – Summary A. This Section includes requirements for temporary facilities and controls, including temporary utilities, support facilities, and security and protection facilities.

PART 2 – PRODUCTS

PART 3 – EXECUTION

B. Site Enclosure Fence: When excavation begins, install enclosure fence. Locate where indicated, or enclose entire Project site or portion determined sufficient to accommodate construction operations. Install in a manner that will prevent people, dogs, and other animals from easily entering sites.

C. Barricades, Warning Signs, and Lights: Comply with standards and code requirements for erecting structurally adequate barricades. Paint with appropriate colors, graphics, and warning signs to inform personnel and public of possible hazard. Where appropriate and needed, provide lighting, including flashing red or amber lights.

END OF SECTION 01500

01601 – MOBILIZATION

PART 1 – GENERAL

1.1 - Description This work shall consist of preparatory work and operations necessary for the movement of personnel, equipment, supplies, and incidentals to the project site, and for all other work and operations that must be performed or that cause costs to be incurred prior to beginning work on the various items on the project site.

PART 2 – PRODUCTS

None

PART 3 – EXECUTION

None

PART 4 – MEASUREMENT AND PAYMENT

Progress payments will be made as follows:

The Contractor may request payment for payment bond. The amount of the premium, including coinsurance and reinsurance agreements, will be paid upon receipt of evidence of full payment to the surety. When separate payment for bonding cost is made, the bonding cost will be subtracted from the total contract amount for this pay item and the balance paid in accordance with the progress payment schedule outlined below.

(a) When 5 percent or more of the original contract amount is earned from other pay items, 50 percent of the amount for mobilization, or 5 percent of the original contract amount, whichever is less, will be paid.

(b) When 10 percent or more of the original contract amount is earned from other pay items, 100 percent of the amount for mobilization, or 10 percent of the original contract amount, whichever is less, will be paid.

(c) Upon completion of all work on the project, any unpaid amount for mobilization will be paid.

Any bonding costs in excess of the total contract amount of this pay item will be paid under one or more other pay items under this contract as determined by the Contracting Officer. In no circumstance will the total amount of this contract be increased as a result of bonding costs exceeding the total contract amount of this pay item.

The total of all payments shall not exceed the original contract amount for this item.

4.2 – Payment

Payment will be made under:

PAY ITEM DESCRIPTION PAY UNIT

01601(01) Mobilization LS

END OF SPECIFICATION 01601

01620 – STORAGE AND PROTECTION

PART 1 - GENERAL

1.1 - Description This section of work covers storage and protection procedures for the products scheduled for use.

1.2 - Related Work Specified Elsewhere 01300 - Submittals

PART 2 - PRODUCTS

None

PART 3 - EXECUTION

3.1 – Manufacturer’s Recommendations Except as otherwise approved by the Engineer, determine and comply with manufacturer’s instructions on product handling, storage and protection.

3.2 - Packing Deliver products to the job site in the manufacturer’s original container, with the labels intact and legible.

1. Maintain packaged materials with seals unbroken and labels intact until time of use.

2. Promptly remove damaged material and unsuitable items from the job site, and promptly replace with material meeting the specified requirements at no additional cost to the Forest Service.

The Engineer may reject as non-complying such material and products that do not bear identification satisfactory to the Forest Service as to the manufacturer, grade, quality and other pertinent information.

All product literature, warranties and operating instructions must be intact and placed in a binder and transmitted to the Forest Service.

3.3 – Protection Maintain finished surfaces clean, unmarred and suitably protected until accepted by the Forest Service.

3.4 – Repairs and Replacements In event of damage, promptly make replacements and repairs to the approval of the Forest Service and at no additional cost to the Forest Service.

PART 4 - MEASUREMENT AND PAYMENT

4.1 - Measurement There will be no separate measurement for this section.

4.2 - Payment This work is incidental to other items in the contract and direct separate item payment will not be made.

END OF SPECIFICATION 01620

01710 – CLEANING

PART 1 - GENERAL

1.1 - Description Throughout the construction period, maintain the construction site and facilities in an orderly and clean manner as described in this Section.

PART 2 - PRODUCTS

2.1 – Cleaning Materials and Equipment Provide required personnel, equipment and materials as needed to maintain the specified standard.

2.2 – Compatibility Use only the cleaning materials and equipment, which are compatible with the surface being cleaned, as recommended by the manufacturer of the cleaning material.

PART 3 - EXECUTION

3.1 – Progress Cleaning Retain stored items in an orderly arrangement allowing maximum access, not impeding traffic or drainage, and providing required protection of materials.

Do not allow accumulation of scrap, debris, waste material and other items not required for construction of this work.

Provide adequate storage for all items awaiting removal from the job site, observing requirements for fire protection and protection of the ecology.

3.2 – Site Daily, and more often if necessary, inspect the site and pick up all scrap, debris and waste material. Remove such items to the place designated for their storage.

Maintain the site in a neat and orderly condition at all times.

Clean mud and debris from roadways or highways adjacent to the project site daily.

3.3 – Structure At least weekly, inspect the structures and pick up all scrap, debris and waste material and remove them to the place designated for their storage.

“Clean” for the purpose of this paragraph shall be interpreted a meaning free from material capable of being removed by reasonable effort with a handheld broom.

3.4 – Final Cleaning Prior to completion of the work, remove from the job site all tools, surplus materials, equipment, scrap, debris and waste.

Structures:

Final cleaning of the project site shall be approved by the Forest Service prior to final acceptance of the work.

END OF SECTION 01710

DIVISION 2 – SITE WORK

02090 – BLASTING CONTROLS

PART 1- GENERAL

1.1 – Definitions

A. Air Blast: A transient air pressure impulse generated by explosions.

B. Blast Consultant: The Blast Consultant shall be a person with extensive knowledge of noise vibration, and visual impacts of blasting operations, and who is specialized in the detonation of explosives, particularly in the field of rock quarry operations. The Blast Consultant shall be provided by the Contractor.

1. The Blast Consultant must have at least 20 years of experience in construction blasting. They must be able to demonstrate involvement in at least five (5) projects with blasting within 200 feet of residential structures. The Blast Consultant must be able to demonstrate attendance in at least ten (10) short courses, seminars, conferences on blasting technology, or engineering class studies during the past 15 years. For the past five (5) years, the Blast Consultant must have derived their primary source of income from providing specialized blasting consulting services.

C. Blast Control Specialist: Person authorized to act on behalf of the Contractor and licensed by the state or local regulatory agency to possess, transport, and use explosives.

D. Fly Rock: Debris that is ejected or propelled through the air by the blast

E. Frequency: Ground vibration oscillation at peak event, expressed in Hertz.

F. Peak Ground Particle Velocity (PGPV): Maximum of three (3) velocity components measured in three (3) mutually perpendicular directions at a point.

1.2 - Submittals

A. Quality Control Submittals

1. Qualifications of Blast Control Specialist: Submit at least 30 days prior to blasting WORK.

2. Rock excavation plan describing details for Contractor’s proposed rock excavation methods. Submit at least 30 days prior to start of WORK.

3. Detailed blasting plan for each blast shall be submitted at least 48 hours prior to beginning any WORK for that blast.

4. Vibration and air-blast monitoring plan. Submit at least 30 days prior to blasting WORK.

5. Qualifications of Blast Consultant. Submit at least 30 days prior to blasting WORK.

B. Blasting Plan and Blasting Schedule.

1. One (1) week prior to commencing drilling and blasting operations, the Contractor shall submit a “Blasting Plan”, reviewed and approved by the Blasting Consultant, to the Engineer for review. The Blasting Plan shall contain the details of the drilling and blasting patterns and controls proposed for both the controlled and production blasting. The Blasting Plan shall contain the following minimum information:

a. Station limits of proposed shot, the number of blasts, time of each blast.

b. Plan and section views of proposed drill pattern indicating hole size, hole depths and angles hole pattern and spacing and expected rock types.

c. Drill hole diameters (preshear, productions) and depth including subdrilling depths.

d. Drill steel diameter and bit types.

e. Stemming length and type of material used for stemming.

f. Loading details and including trade names, types, sizes of explosives.

g. Average bench height.

h. Proposed initiation and delay sequence of blast holes.

i. Weight of explosives per hole and per delay and powder factors, including weight of explosives per square yard of finished backslope.

j. Anticipated vibration levels and peak particle velocities at locations specified by Engineer.

k. Anticipated blasé decibel level at nearest dwelling.

2. At any time the Contractor porposes to change the drilling or blasting methods, the Contractor shall submit a revised Blasting Plan for the affected WORK not later than one (1) week prior to the proposed commencement of the change in the WORK.

3. The Blasting Plan submittal is for quality control and record-keeping purposes. Review of the Blasting Plan by the Engineer or Blasting Consultant shall not relieve the Contractor of their responsibility for the accuracy and adequacy of the plan when implemented in the field.

C. Project Closeout Submittals.

1. Summary Report: Submit within 30 days of completion of blasting.

1.3 – Quality Assurance

A. Blast Control Specialist: Must have a minimum of ten (10) years experience with blast design and vibration and air-blast monitoring, and significant involvement as the Blast Control Specialist in a minimum of ten (10) previous projects of similar nature. The Blast Control Specialist shall be a licensed blaster in the State of Arizona and shall be subject to the approval of the Blast Consultant.

1.4 – Sequencing and Scheduling

A. Blasting shall be restricted to the times between 9 AM and 9 PM

B. Blast only with direct written approval for each blast by the Blast Consultant.

C. Warning signs and public notification are required to avoid all risks to the public that use the roadway. The Contractor shall be responsible for provide to the Forest Service and to the Arizona Department of Transportation (ADOT) with its proposed traffic control plan for review and approval prior to any blasting or hauling.

D. The Contractor shall provide the Sedona Airport, the Sedona Police Department and the Sedona Fire Department with written notice of blasting a minimum of 24 hours in advance of each blast.

1.5 – Controlled Blasting

A. Material which would classify as rock and which requires drilling and blasting to remove will be accomplished by controlled blasting. Controlled blasting is defined as the establishment of a free surface or shear plane in rock along the lines of the specified backslope by the controlled usage of explosives and blasting accessories in appropriately aligned and spaced drill holes.

B. The Contractor shall perform short test lines of holes consisting of presplit or cushion blasting if changes in conditions warrant, to determine the loading, spacing and depth or lift required to obtain desired PGPV, air blast pressures and excavation geometry. These tests will be monitored by the Blast Consultant using Contractor supplied seismographs. As part of the blasting plan, the Contractor shall prepare graphs depicting the PGPV as function of the distance from the detonation point, for each explosion loading. Explosive loading for production blasting will then be selected from the graph to limit PGPV to less than two inches per second measured next to the closest structure adjacent to the blast.

C. The Contractor shall submit a copy of the Blast Consultant-approved general blast plan description and a copy of each Blast Consultant-approved individual blast plan to the Engineer prior to blasting. The Contractor shall also submit a copy of their ADOT-approved traffic control plan to the ENGINEER prior to any blasting.

PART 2 – PRODUCTS (Not Used)

PART 3 - EXECUTION

3.1- Construction

A. All explosives shall be of such character and in such amount as permitted by the state and local laws and ordinances and all respective agencies having jurisdiction over them.

B. The Contractor shall implement a blast notification program, as approved by the Engineer, and in accordance with applicable standards.

C. The Contractor shall use the utmost care so as not to endanger life or property, or disturb materials outside the limits of the excavation..

D. Explosives, including blasting caps, shall be transported and stored in a safe, secure manner in accordance with the requirements of the appropriate public body having jurisdiction in such matters. Only persons experienced in the handling of explosives are to be allowed to use them on the WORK. Where state or local laws require, explosives are to be handled only by licensed personnel.

E. The Contractor shall provide all necessary approved types of tools and devices required for handling and using explosives, blasting caps, and accessories. The Contractor shall conform to and obey all federal, state and local laws that may be imposed by any public authority having legal jurisdiction.

F. When blasting, ample warning shall be given to all persons within the vicinity prior to blasting. Warning signs shall be erected a minimum of 24 hours prior to the blast time, and workers shall be stationed to warn people before firing any blasts. The warning signs will state the time and date of each blast.

G. After a blast has been fired, the Blast Control Specialist shall make a careful inspection to determine that all charges have exploded before employees are allowed to return to the operation. Misfires shall be corrected in accordance with the requirements of the applicable portions of the federal, state, or local safety codes for blasting. The Contractor shall be responsible for any and all damage to property or injury to persons resulting from blasting or accidental or premature explosions that may occur in connection with his use of explosives.

H. All rock that is loose, hanging or creating a dangerous situation shall be removed or stabilized, to the Blast Consultant's satisfaction, during or upon completion of the excavation in each lift as an integral sequence in each cycle of excavation. Drilling of the next lift will not be permitted until this WORK, and any rock stabilization that is necessary has been completed.

I. Material outside of the planned neatline slopes which, in the opinion of the Blast Consultant, is unstable and constitutes potential slides shall be excavated and removed.

J. No blast shall exceed an in-place volume of 5,000 cubic yards.

3.2- General

A. The Contractor shall be required to submit a description of the blast plan to the Blast Consultant no less than 21 days prior to the blasting operation. The proposed method shall be subject to the approval of the Blast Consultant. The description shall include at least the following:

1. Limits of cut or lift

2. Average bench height

3. Hole positions, including angle and depth

4. Blast hole diameters

5. Type and quantity of explosives (including manufacturer's data sheets)

6. Method of initiation and firing sequences

7. Powder factor

8. Depth and type of stemming.

B. Review of the blast plan by the Blast Consultant shall not relieve the Contractor of responsibility for the accuracy and adequacy of the blast plan when implemented in the field. This includes, but is not limited to, obtaining adequate fragmentation, using proper detonation procedures and following proper safety procedures prior to and after the blast.

C. The WORK shall be conducted in such a manner that rock outside the excavation limits will be undisturbed, nearby structures will not be disturbed in any way, and the shape of the excavation will conform as nearly as possible to the lines and grades shown on the Drawings.

D. It is imperative that the blasting WORK does not disturb or impair the existing overhead electrical lines in any way. Any damage shall be immediately repaired. To help ensure against potential damage beyond the lines of intended excavation, the Contractor shall employ the best modern practice of controlled blasting methods.

E. The Contractor shall assign a supervisor of mature experience specialized in the use of explosives to the blasting operations, who shall be maintained on a full-time basis during the time that blasting is in progress.

F. The Contractor is forewarned that existing residential and commercial properties may be located in close proximity of the blast and that these properties shall be protected. The Contractor shall be responsible for all damage to these properties, including providing suitable temporary housing to residents or business occupants until repair WORK is completed.

G. Blasting shall be monitored by the Blast Consultant using Contractor-furnished monitoring devices. The Blast Consultant will be responsible for the location and placement of these monitoring devices. The Contractor will be responsible for the protection of these monitoring devices from its equipment and operations.

H. To ensure the accuracy of firing times of blasting caps, it is required that each cap period come from one lot number. Mixing lot numbers for any one cap period is prohibited.

3.3- Controlled Blasted Surfaces

A. For all rock slopes the Contractor shall use controlled blasting along the lines of the final rock cut slope face.

B. Controlled blasting refers to the controlled use of explosives and blasting accessories in carefully spaced and aligned drill holes to produce a free surface or shear plane in the rock along the specified excavation backslope. Controlled blasting techniques covered by this Specification includes pre-splitting and cushion (trim) blasting.

C. The purpose of controlled blasting is to ensure long-term rock slope stability by minimizing damage to the rock backslope. The Engineer may require the Contractor to use controlled blasting to form the faces of slopes, even if the main excavation can be ripped.

D. Prior to drilling the control blast holes, all overburden and/or loose disintegrated rock shall be removed down to solid rock in the vicinity of the holes.

E. All rock backslope faces shall be scaled of loose fragments.

F. Blast holes for controlled blasting shall be drilled within three-inches of the staked collar location. If more than five percent of the holes are outside of the three inch tolerance, they shall be filled with crushed stone and re-drilled at the proper location.

G. The Contractor will be required to drill from the top of the cut downward for rock cuts greater than ten (10) feet in height.

H. The diameter of the control blast holes shall not be smaller than two and one half inches or greater than three inches. The deviation of these drill holes either parallel or normal to the backslope shall not exceed eight inches. If greater than five percent of the controlled blast holes are misaligned in any one lift, the Contractor shall reduce the height of the lifts until the eight inch alignment tolerance is met.

I. Buffer holes shall be drilled three feet out from the controlled blast holes on four foot centers. The buffer holes shall be drilled parallel to the controlled blast holes. The load per buffer holes shall not exceed 50 percent of the average load per production hole next to the buffer line.

J. All drilling equipment used to drill the control blast shall have mechanical devices affixed to that equipment to accurately determine the precise angle at which the drill steel enters the rock. Control blast hole drilling will not be permitted if these devices are either missing or inoperative. Hand held devices, including levels, shall not be used.

3.4- Line Drilling, Cusiion Blasting, Presplitting

A. Methods such as line drilling, cushion blasting, or pre-splitting shall be used to control damage beyond the final cut faces shown on the Drawings. Methods such as line drilling and pre-splitting are used to ensure that a shear plane is established between the periphery holes, thus minimizing strain or cracks in the rock beyond the blasting perimeter. Except as otherwise directed by the Blast Consultant, pre-splitting and line-drilled holes shall not be larger than three inches in diameter, and spaced no more than two feet and six inches apart, center to center, respectively.

B. Cushion blasting is similar to pre-splitting, except that the detonation along the cut face shall be performed after the detonation of the production holes.

C. The Contractor shall line drill, perform cushion blasting, or pre-split all native, permanently exposed, or steeply inclined cut faces (1H to 1V, or steeper).

D. The line drilling, cushion blasting or pre-splitting blast holes shall be between two and one half and three inches in diameter.

E. Cuts with a vertical height greater than ten feet and an average horizontal thickness of greater than 25 feet as measured from the free face to the back row of blast holes shall be "Pre-split" blasted.

1. Pre-splitting shall be performed for all rock slopes over ten feet in height. It shall consist of drilling holes on the plane of the final backslope then loading the holes with a continuous or well disturbed explosive charge, and then firing the holes to create a crack along the line of the backslope. Ground vibration is a consideration. The Contractor shall delay the pre-split holes no more than 25 milliseconds along the pre-split line. The detonation of the pre-split line must precede the detonation of all other blasting in the cut. The pre-split line may be detonated in advance of the main production blasting or fired along with the production blasting, providing that the pre-split line is detonated a minimum of 25 milliseconds ahead of all other blasting.

2. The pre-split holes shall be drilled initially on 30-inch center spacing. Prior to loading these pre-split holes, each hole shall be inspected and tested for the entire length to determine that the hole is free and clear of obstructions. If the hole is obstructed, the hole shall be cleaned prior to loading. All necessary precautions shall be exercised so as to prevent debris from falling into the holes prior to loading, and that the placing of the charge shall not cause caving of materials from walls of the hole.

3. The maximum initial explosive charge used in these holes shall be no more the 0.14 pounds per square foot of rock surface of the final slope face. Ammonium nitrate and fuel oil (ANFO) shall not be allowed to be loaded in the pre-split hole. Depending on the condition of the rock encountered and the smoothness of the final slope face, the explosive loads per square foot and the spacing of the presplit holes may be altered, as required, after an inspection and evaluation by the Engineer.

4. The space in each pre-split hole not occupied by explosives may or may not be stemmed depending on the condition of the rock encountered. In all cases, the top three feet of the pre-split holes shall be stemmed.

5. The maximum diameter of the explosives used in pre-split holes shall not be greater than one-half the diameter of the pre-split hole.

6. Only standard explosives manufactured especially for pre-splitting shall be used in pre-split holes, unless otherwise approved by the Engineer.

7. If fractional portions of standard explosive cartridges are used, they shall be firmly affixed to the detonating cord in such a manner that the cartridges shall not slip down the detonating cord nor bridge across the holes. Spacing of fractional cartridges along the length of the detonating cord shall not exceed 30 inches center to center, and shall be adjusted to give the desired results.

8. Continuous column cartridge-type of explosives used with detonating cord shall be assembled and affixed to the detonating cord in accordance with the explosive manufacture's instructions; a copy of which shall be furnished to the Engineer. No detonating cord shall be used on the surface.

9. The bottom charge of a pre-split hole may be larger than the line charges, but shall not be large enough to cause overbreak. The top charge of the pre-splitting hole shall be placed far enough below the collar, and reduced sufficiently, to avoid overbreaking and heaving.

F. Cuts with a vertical height greater than ten feet and an average horizontal thickness less than 25 feet as measured from the free face to the back row of blast holes shall be "cushion" blasting.

1. Where the horizontal distance from the cut face to the existing rock face is less than 25 feet, the Contractor may cushion blast in lieu of pre-splitting. Cushion blasting is similar to pre-splitting, except that the detonation along the cut face shall be performed after the detonation of all production holes. The difference in delay time between the trim line and the nearest production row shall not be greater than 75 milliseconds, nor less than 25 milliseconds. With the exception of the above criteria, requirements previously stated for preshearing shall also apply to cushion blasting.

3.5- Silver Cuts

A. For silver cuts, pioneering the top of cuts and preparing a working platform to being the controlled blasting drilling operations may require unusual working methods and use of equipment. The Contractor may use angle drilled holes or fan drilled holes during the initial pioneering operations to obtain the desired rock face. The hole diameter requirements for controlled blasting are applicable for pioneering work. Hole spacing shall not exceed 30 inches.

3.6- Production Blasting

A. Production blasting, as covered herein, refers to the rock fragmentation blasts resulting from more widely spaced production holes drilled throughout the main excavation area, adjacent to the controlled blast line. Production holes shall be detonated in a controlled delay sequence.

B. All production blasting, including that carried out in conjunction with the blasting test section requirements, shall be performed in accordance with the following general requirements:

1. Production blast holes shall be drilled on the patterns submitted by the Contractor and approved by the Engineer. The production blast holes shall be drilled within two blast hole diameters of the staked collar location. If more than five percent of the holes are drilled outside of this tolerance, at the option of the Engineer, the Contractor may be required to refill these holes with crushed stone and re-rill them at the proper location.

2. The production holes shall not exceed four inches in diameter and shall be drilled to a depth that is below the finished surface elevation, such that unbroken rock does not extend above the finish surface.

3. The depth of individual horizontal lifts, the depth of blast holes, and the amount of explosive per hole and per delay shall vary depending on the average thickness of the lift as measured from the cut face to the existing rock face, and shall not exceed the following amounts:

4. If the blast holes are plugged or unable to be fully loaded, the Contractor shall be required to deepen or clean out those holes. The blast holes should all be checked and measured before any explosives are loaded into any of the holes to eliminate any safety hazard resulting from drilling near loaded holes.

5. All blast holes should reach their desired depth, and if more than five percent of the holes are short before loading, the Contractor may be required by the Engineer to re-drill the short holes to proper grade at the Contractor's expense.

6. In order to control blasting effects, the Contractor must maintain a burden distance that is not more than one-half the bench height.

7. Blast holes shall be covered after drilling to deep overburden from falling into the holes.

8. The row of blast holes immediately adjacent to the controlled blast line shall be drilled on a plane approximately parallel to the controlled blast line. Production blast holes shall not be drilled closer than three feet to the controlled blast line, unless approved by the Engineer. The bottom of the projection holes shall not be lower than the bottom of the controlled blast holes, or by approval of the Engineer may be lower than the controlled blast holes by the amount of subdrilling used on the production holes. Detonation of production holes shall be on a delay sequence towards a free face. Stemming material used in production holes shall be crushed stone and shale, not sand or drill cuttings.

9. It is the Contractor's responsibility to take all necessary precautions in the production blasting so as to minimize blast damage to the rock backslope.

10. Do not begin production blasting prior to the line drilling, pre-splitting, or as required to preserve the rock beyond the limits of the excavation.

3.7- Control Criteria, Monitoring and Explosive Product Requirement

A. The Contractor shall submit for review the proposed methods and sequence of blasting for rock excavations. The Contractor shall identify the number, depth, and spacing of holes; stemming and number and type of delays; methods of controlling overbreak at excavation limits, procedures for monitoring the shots and recording information for each shot; and other data that may be required to control the blasting.

B. The Contractor shall submit to the Blast Consultant for review a completely detailed blasting plan of each blast at least 48 hours prior to preparing for, drilling or loading the holes. These details shall include the location of all holes relative to the excavation plans and sections, the size of all holes, the typical loading pattern of each hole, the distribution of charge within each hole, and the number of each delay.

C. The Contractor shall develop a trial blasting technique that identifies and limits the vibrations and damage at varying distances from each shot. This trial blasting information shall be collected and recorded by beginning the WORK at points farthest from areas to remain without damage.