Attachment_1_Statement_of_Work_Pavement_Preservation.pdf

P17PS02249 North Cascades NPS Complex Attachment 1: Statement of Work

Introduction

1. Summary: This contract is for perform pavement preservation maintenance at North Cascades

NPS Complex, Newhalem visitor center parking lots and service road, and Goodell Creek Campground, parking lot, and raft launch. Maps and drawings are in Attachment 2.

2. Background: North Cascades National Park (NOCA) requires periodic cyclic pavement preservation and maintenance to extend the pavement life of paved roads and parking lots.

3. Requirements: Work consists of cleaning, filling, preparing and sealing any surface cracks, applying slurry seal on entire surface, and repainting traffic control markings in the Goodell campground and Newhalem visitor center paved areas. Work shall conform to the Road Maintenance Specifications on the following pages.

4. Schedule: The period of performance (PoP) is 30 days, starting upon issuance of the Notice to

Proceed. On-site work is not allowed before September 5, 2017; target completion is on or prior to October 20, 2017. Note: the Skagit River bridge (access to the Newhalem visitor center) will be closed for repairs 9/19 to 9/22 or 9/25 to 9/29, and the visitor center portion of this contract may not occur while the repair work is in progress. Work at Goodell may occur any time during the PoP.

5. Place of Performance: Newhalem visitor center parking lots and service road, and Goodell Creek

Campground loops, parking lot, and raft launch. Both locations are near the town of Newhalem, WA. Goodell Creek Campground is at mile post 119.5 on State Route 20 and the North Cascades Visitor Center is on Newhalem Creek Road 0.7 mile south of State Route 20 milepost 119.9. Maps and drawings are in Attachment 2; additional maps and information may be found at https://www.nps.gov/noca/index.htm

6. Parking Construction Vehicles: Park vehicles only on existing roads, in legally designated areas, and within approved staging area(s).

https://www.nps.gov/noca/index.htm

National Park Service Pacific West Region

Road Maintenance Specifications

(Including asphalt crack repair, slurry seal surfacing, and reapplying traffic markings)

P17PS02249 North Cascades NPS Complex Attachment 1: Statement of Work

SECTION 01010 GENERAL REQUIREMENTS

PART 1: DESCRIPTION OF WORK

1.1 The work of this project consists of cleaning and filling cracks in asphalt pavement with hot rubberized crack sealer, applying slurry seal, and reapplying all pavement markings with traffic control and incidentals, complete and ready for use at various park locations.

1.2 All work will be performed under a single contract.

PART 2: EXISTING UTILITIES

2.1 There may be underground electricity, phone and water lines in the project area.

Contractor is responsible for identifying all utility lines prior to construction. If a contractor damages a known utility the cost of repair will be the responsibility of the contractor. If Contractor damages unknown utility, repair utility, and equitable adjustments will be made in accordance with the changes clause.

PART 3: CONTRACTOR’S USE OF PREMISES

3.1 CONSTRUCTION CAMP: Establishment of a camp within the park will not be permitted.

However, public camping at Newhalem Creek Campground is available on a first come first serve basis during open season. During non-work hours, Contractors are treated and can enjoy the same benefits as the visiting public when in the park. Camping in the park is limited to a total of not more than 30 days in a calendar year. The Contractor must follow the same rules and pay the same fees as other members of the public. A valid front-country Campground Permit is required for camping at Colonial Greek, Gorge Creek, Newhalem Creek, Goodell Creek, and Upper and Lower Goodell Campgrounds (see http://www.nps.gov/noca/planyourvisit/camping.htm). Additional lodging options, including RV parks and cabins, are available in Marblemount.

3.2 CLOSURES: Contractor shall at all times conduct operations in a safe manner and to ensure the least inconvenience to the public. One lane of the project roads may be closed at a time. Provide alternating one way traffic in the remaining lane. Maximum delay for traffic in any one direction shall not exceed 15 minutes. No night, weekend or federal holiday work will be permitted, unless prior approval is sought from and granted by the Contracting Officer’s Representative (COR).

3.3 STORAGE - STAGING AREAS: Confine storage of materials to the immediate project area, road shoulders, and adjacent parking areas. Aggregate chips may be stockpiled in location(s) as directed and approved by the Contracting Officer. Limits of use and control shall be subject to Contracting Officer's approval. Care must be taken to not damage any pavement or curbing. Any damage will be repaired at contractor expense.

3.4 FIELD OFFICE: Should Contractor elect to utilize a field office on the project, the size, location, and construction is subject to Contracting Officer's approval.

3.5 PRESERVATION OF NATURAL FEATURES: Confine all operations to work limits of the project. Heavy equipment will be confined to use on the road bench, and within excavation limits. Prevent damage to natural surroundings. Avoid unnecessary soil compaction, disturbance of ground cover, and creation of wheel ruts. Restore damaged areas, repairing or replacing damaged trees and plants, at no additional expense to the Government. Do not fasten ropes, cables, or guys to existing trees. All equipment shall be thoroughly washed prior to transport to the park to prevent unintentional importation of weed seed material into the National Park.

3.6 HAULING RESTRICTIONS: Comply with all legal load restrictions for hauling materials.

Load restrictions on park roads are identical to the state load restrictions.

3.7 HOUSEKEEPING:

A. Keep projects neat, orderly, and in a safe condition at all times. Store and use equipment, tools, and materials in a manner that does not present a hazard.

Immediately remove all hazardous rubbish. Do not allow rubbish to accumulate.

Provide on-site containers for collection of rubbish and dispose of it outside of the National Park boundary at frequent intervals during progress of work.

B. Wet down dry materials and rubbish to prevent blowing dust.

C. Do not bury refuse inside the park. Dispose of waste materials legally at public or private dumping areas outside the park.

PART 4: COMMENCEMENT, PROSECUTION, AND COMPLETION

4.1 The Contractor shall commence work within five (5) calendar days after the date of receipt of the "Construction Notice to Proceed." Construction work shall progress in an orderly and diligent manner, and shall be completed within 30 calendar days from the Construction Notice to Proceed. Contractor shall note that acceptable temperature seasons are short. Contractor will be responsible for scheduling work at individual project sites when temperatures fall within allowable ranges as specified in the following sections.

PART 5: EXAMINATION OF THE SITE

5.1 All prospective quoters are encouraged to visit the job sites and examine existing conditions before submitting quotes. All quoters will be held to have the same knowledge concerning the site and the on-ground conditions as if they had inspected the job site.

PART 6: ABBREVIATIONS

6.1 The following list of abbreviations, which may be used in the Construction Specifications or Special Provisions, refer to the organizations and specifications of the organizations listed below:

AAN - American Association of Nurseryman

AASHTO - American Association of State Highway and Transportation Officials ACI - American Concrete Institute AISC - American Institute of Steel Construction AI - Asphalt Institute ANSI - American National Standards Institute ASTM - American Society for Testing and Materials AWWA - American Water Works Association Caltrans - State of California Department of Transportation FHWA - Federal Highway Administration FS - Federal Specifications IDT - Idaho Department of Transportation MSHA - Mine Safety and Health Administration MUTCD - Manual on Uniform Traffic Control Devices NEC - National Electric Code NEMA - National Electrical Manufacturers Association NFPA - National Fire Protection Association NIOSH - National Institute of Occupational Safety and Health NPS - National Park Service NSF - National Sanitation Foundation ODOT - Oregon Department of Transportation OSHA - Occupational Safety and Health Administration PCA - Portland Cement Association UBC - Uniform Building Code UL - Underwriters Laboratories, Inc.

WSDOT - Washington State Department of Transportation

PART 7: FIELD ENGINEERING

7.1 LAYOUT OF WORK: The Contractor shall layout the work in consultation with the

Contracting Officer's Representative. Locations on drawings are conceptual and subject to final adjustment on site as the work progresses.

7.2 FIELD CONTROLS: Locations and elevations shown on the drawings are subject to final field adjustment by COR before construction.

7.3 SPECIFICATIONS: In addition to the project specifications, the contractor is required to meet local, county, and/or state Department of Transportation requirements where the project work is located. Contractor may, at their discretion, submit for approval by the Contracting Officer, equivalent requirements which conform to the Washington Department of Transportation (WDSOT).

PART 8: ACCIDENT PREVENTION

8.1 DESCRIPTION: The work of this section consists of establishing and implementing an effective accident prevention program and providing a safe environment for all personnel and visitors. See also FAR clause 52.236-13, Alt. 1.

8.2 SUBMITTALS:

A. ACCIDENT PREVENTION PROGRAM: Prior to the preconstruction conference, submit for approval an accident prevention program. The program shall include:

Name of responsible supervisor to carry out the program.

First aid procedures.

Training, both initial and continuing.

Planning for possible emergency situations.

Certificates: Provide certificates from a mechanic that all mechanical equipment has been inspected and meets OSHA requirements.

B. MEETING AND INSPECTION REPORTS: Submit a report of safety meetings and of inspections.

8.3 QUALIFICATIONS OF EMPLOYEES:

A. Ensure that employees are physically qualified to perform their assigned duties in a safe manner.

B. Do not allow employees to work whose ability or alertness is impaired because of drugs, fatigue, illness, intoxication, or other conditions that may expose themselves or others to injury.

C. Operators of vehicles, mobile equipment, hoisting equipment, and hazardous plant equipment shall be able to understand signs, signals, and operating instructions, and be capable of operating such equipment. Provide operating instructions for all equipment.

D. Newly hired operators shall be individually tested by an experienced operator or supervisor to determine if they are capable of safely operating equipment.

8.4 ACCIDENT REPORTING: The Contractor shall report all accidents to the Contracting

Officer as soon as possible and assist the Contracting Officer and other officials as required in the investigation of the accident.

8.5 FIRST AID FACILITIES: Provide adequate facilities for the number of employees and the type of construction at the site.

8.6 EMERGENCY INSTRUCTIONS: Post telephone numbers and reporting instructions for ambulance, physician, hospital, fire department, and police in conspicuous locations at the work site.

8.7 PROTECTIVE EQUIPMENT:

A. Meet requirements of NIOSH and MSHA, where applicable, as well as ANSI.

B. Inspect personal protective equipment daily and maintain in a serviceable condition.

Clean, sanitize, and repair, as appropriate, personal items before issuing them to another individual.

C. Inspect and maintain other protective equipment and devices before use and on a periodic basis to ensure safe operation.

D. It is the Contractor's responsibility to require all those working on or visiting the site to wear hard hats and other necessary protective equipment at all times. Change liners before reissuing hats.

8.8 SAFETY MEETINGS: As a minimum, conduct weekly 15 minute "toolbox" safety meetings. These meetings shall be conducted by the site superintendent and attended by all construction personnel at the worksite.

8.9 HAZARDOUS MATERIAL ACTION: It shall be the responsibility of all operators and contractors, functioning within the park to properly clean up, mitigate, and remediate if necessary, all unauthorized discharges of hazardous materials or non-hazardous chemical and biological products released from fleet and/or other support vehicles or stationary sources. Response shall be consistent with guidelines established by federal, state and local regulations, and as outlined within the operator's Safety or Hazardous Materials Business Plan.

A. If a spill, leak or other release occurs, the operator shall as soon as possible, without impeding cleanup, notify the National Park Service Communications Center (“dispatch”).

B. All vehicles with a load rating of two (2) tons or greater should carry, at minimum, enough absorbent materials to effectively immobilize the total volume of fluids contained within the vehicle. Sand or soil are not approved absorbent materials.

C. Vehicles and operators transporting hazardous materials must be certified and/or registered by the Washington Department of Transportation. Operators must be state-licensed and knowledgeable of local emergency response and personal safety protocol.

D. Oil leaks from the various pieces of equipment shall be repaired immediately on discovery. Repairs shall be performed at the site of discovery or breakdown. Oil pans and absorbent material shall be in place prior to beginning repair work.

E. Absorbent materials may be ordered from:

Lab Safety Supply P.O. Box 1368 Janesville, WI 53547-1368

(800) 356-0722

Polysorb Blankets JB-17-921 Universal Sorbent Rolls JB-8617

New Pig Corporation 1 Pork Avenue Tripton, PA 16684

(800) 468-4647

F. Oil pans and absorbent materials shall be used to prevent leaks, spills and draining of petroleum fluids from falling onto bare ground and paved surfaces during servicing of equipment. Soils contaminated with such fluids shall be dug up and placed in appropriate safety containers, removed from the Park and disposed of according to state regulations in the state for which the work is done.

G. Puddles of oil, gas, hydraulic or other similar petroleum based fluids of one (1) gallon or more or affected areas of more than one (1) square foot shall be considered "Road Damage" on paved surfaces.

H. Loss of any petroleum fluid of forty (40) gallons or greater shall be reported through the 911 emergency phone system immediately to initiate emergency response actions. Clean up shall be according to state regulations.

PART 9: PRECONSTRUCTION CONFERENCE:

9.1 PRECONSTRUCTION CONFERENCE: Before start of construction, Contracting Officer will arrange an on-site meeting or telephone conference call with Contractor and COR.

PART 10: SUBMITTALS

10.1 DESCRIPTION: The work of this section consists of submittal requirements before and during construction.

10.2 SHOP DRAWINGS, PRODUCT DATA, AND SAMPLES:

A. As specified in the individual sections, forward submittals to Contracting Officer at least 15 days before need for approval.

B. After approving submittals, Contracting Officer will return one copy to the

Contractor.

C. If submittals are not approved; Contracting Officer will return all copies to

Contractor with reasons for rejection. Resubmit, identifying changes.

D. Any work done before approval shall be at Contractor's own risk.

10.3 APPROVED EQUALS: A request for approval constitutes a representation that

Contractor:

A. Has investigated the proposed item and determined that it is equal or superior in all respects to that specified.

B. Will provide the same warranties for the proposed item as for the item specified.

C. Has determined that the proposed item is compatible with interfacing items.

D. Will coordinate the installation of an approved item and make all changes required in other elements of the work because of the substitution.

E. Waives all claims for additional expenses that may be incurred as a result of the substitution.

10.4 PROGRESS SCHEDULES: As soon as possible after Notice of Award and before beginning any work, submit Progress Schedule showing estimated starting and completion dates for each phase of the work.

PART 11: TEMPORARY SERVICES

11.1 DESCRIPTION: The work of this section consists of providing temporary services required for Contractor's performance of the work of this Contract.

11.2 SANITARY FACILITIES: The Contractor’s employees may use public restrooms at pullouts, campgrounds, visitor center, and trailheads, but they may be some distance from the work sites. Contractor may furnish portable toilets and place in location(s) acceptable to the COR.

11.3 DRINKING WATER: Provide sufficient quantity of good drinking water in sturdy, sanitary containers. Containers shall be located so they would not be subjected to contamination. Water shall be changed at least once a day.

11.4 FIRE PREVENTION AND PROTECTION:

A. Hazard Control: Take all necessary precautions to prevent fire during construction.

Provide adequate ventilation during use of volatile or noxious substances.

B. Equipment Required: UL Class 2A, 2-1/2-gallon, water-type, stored pressure extinguisher and UL Class 10, Type I, 15-pound, C. Carbon dioxide extinguisher. Furnish a minimum of one of each type of extinguisher for each area of work. Travel distance from any workstation to the nearest extinguisher shall not exceed 100 feet.

D. Spark Arresters: Equip all gasoline or diesel powered equipment used in potential forest or grass fire locations with spark arresters approved by the U.S. Forest Service. Exceptions will be made for diesel equipment equipped with a turbo-charger. Written determinations of areas and period of potential fire hazard will be issued by Contracting Officer.

E. Welding: Welding or cutting by torch shall be performed only when adequate fire protection is provided.

11.5 TELEPHONE: The Contractor may use the Newhalem visitor center phone for emergencies only. Cell phone reception is uncertain in the project areas.

PART 12: PROTECTION OF PUBLIC

12.1 Construction and traffic control signing shall be installed in accordance with WA

Department of Transportation and the Manual of Uniform Traffic Control Devices (MUTCD) by the Federal Highway Administration (FHWA).

12.2 Traffic control personnel shall be attired and perform their work in compliance with

MUTCD.

12.3 Provide three Type II barricades on each side of any excavation to further warn any vehicles that are on the road of the obstruction.

12.3 Coordinate construction efforts such that there is minimal impact to the work of

National Park Service personnel and the visiting public.

PART 13: PROJECT CLOSEOUT

13.1 DESCRIPTION: The work of this section consists of final cleanup, closeout submittals, final inspection procedures, and safety precautions.

13.2 CLEANING: Remove all tools, equipment, surplus materials, and rubbish. Sweep paved areas and restore natural areas to original condition. At time of final inspection, project shall be thoroughly clean and ready for use.

13.3 AS-CONSTRUCTED DRAWINGS: Show all changes and revisions to the original design that affect the permanent structures and will exist in the completed work.

13.4 SUBSTANTIAL COMPLETION AND FINAL INSPECTION: Submit written certification that project is substantially complete, and a final inspection is requested.

Contracting Officer will make an inspection within 10 days of receipt of request.

A. When Contracting Officer determines that the work is substantially complete, s/he will prepare a list of deficiencies to be corrected before final acceptance and issue a Letter of Substantial Completion.

B. If Contracting Officer determines that the work is not substantially complete, s/he will immediately notify Contractor in writing, stating reasons. After completing work, Contractor shall resubmit certification and request a new final inspection.

13.5 ACCEPTANCE OF THE WORK: After all deficiencies have been corrected, a Letter of Acceptance will be issued by the Contracting Officer.

END OF SECTION 01010

SECTION 02711 HOT RUBBERIZED CRACK SEALING

PART 1 GENERAL

1.1 DESCRIPTION

A. The work of this section consists of preparing, filling and sealing cracks in Asphalt Concrete (AC) pavements with hot rubberized pourable crack sealer material. All cracks ¼-inch or greater in width shall be cleaned and filled by the Contractor. The work includes a furnishing and applying blotter material if necessary. Routing of cracks is not required.

1.2 SUBMITTALS

A. As specified in Section 01010.

B. Manufacturer's certification certifying the crack sealant material is of the type, grade, and quality specified, e-mailed to COR.

1.3 PROJECT CONDITIONS

A. Apply crack sealant material only during daylight hours, when pavement surface is dry and weather is not foggy or rainy. Air temperature shall be 40 degrees (F) or higher. Cracks and fissures be filled when contraction or shrinkage of pavement is at its maximum.

PART 2 PRODUCTS AND EQUIPMENT

2.1 CRACK SEALANT

A. HOT POURABLE RUBBERIZED CRACK SEALANT, RoadSaver 221 as manufactured by Crafco Inc. Chandler, AZ, (800) 528-8242, (www.crafco.com) or approved equal meeting or exceeding AASHTO M 173 and ASTM D 1190.

B. Sealant shall be supplied pre-blended, pre-reacted, and prepackaged. If supplied in solid blocks the material shall be cast in a plastic or other dissolvable liner having the capability of becoming part of the crack sealing liquid. The sealant shall be delivered in the manufacturers sealed containers. Each container shall be legibly marked with the manufacturer's name, and trade name of the material. Material from different manufacturers or different types of materials shall not be intermixed.

2.2 PREPARATION AND APPLICATION EQUIPMENT

A. MELTER POT AND APPLICATION WAND: The melter pot shall be an indirect double boiler type using oil or other heat transfer medium. No direct-fired pots will be allowed.

The heating pot shall be capable of controlling the temperature of the sealant within the manufacturers recommended application range. A thermometer calibrated within +/- 50F for a range of 200 to 5000F shall be provided. The heating pot shall be capable of constantly agitating the material. A pump shall feed the application wand, as gravity flow of the sealant is not acceptable.

http://www.crafco.com/

B. AIR COMPRESSOR: Shall be capable of providing compressed air at a minimum of 90 pounds per square inch (620KPa), and 150 cubic feet per minute. The compressor shall be equipped with moisture and oil filters to avoid the introduction of oil and water into pavement cracks.

C. HOT AIR LANCE: A hand held, propane-fired, compressed air lance producing 2,500 Degree (F) air at a velocity of 1,970 feet per second shall be used to dry cracks if moisture is present. A direct flame heat lance shall not be used.

2.3 BLOTTER MATERIAL

A. Clean durable particles of crushed or natural sand. Maximum size of aggregate not to exceed 3/16 inch.

PART 3 EXECUTION

3.1 GENERAL

A. All cracks ¼-inch, to 1-1/2-inches in width shall be cleaned, filled and sealed as described below.

B. For cracks with a width greater than 1-1/2 inch, fill flush to the existing surface with industry-standard asphalt mix or approved filler. Provide CO with product information for approval prior to its use.

3.2 CRACK PREPARATION

A. Remove any loose chunks of pavement from crack as directed by Contracting Officer’s. Scrape all grass or vegetation from cracks with a sharp pointed tool. Using compressed air, blast all loose dirt, dust, and debris from cracks. Clean all cracks with an average opening of ¼ inch or more to make a sealant reservoir to the depth of the crack or at least ¾ inch deep. Do not clean the crack any deeper than the pavement is thick. Direct all dirt and debris away from traffic and pedestrians, or provide a plywood panel to protect traffic from blowing debris. All workers in vicinity of the blasting operation shall where eye protection.

B. If moisture is present in cracks, the hot air lance must be used to dry cracks prior to filling and sealing. Do not allow lance to overheat and deteriorate edges of AC pavement.

C. Do not allow crack cleaning operation to get far ahead of crack sealing operation. Any cleaned cracks left unfilled overnight shall be cleaned again, and if necessary, dried the next morning prior to sealing and filling.

3.3 CRACK SEALANT APPLICATION

A. For cracks with a 1-1/2-inch width or less, seal with a hot-poured elastic sealant.

Immediately screed the joint sealant to 1/8 inch to 1/4 inch below the elevation of the existing surface. A tack preventative material may be used to allow easier opening for traffic. Provide CO with product information for approval prior to its use.

B. Melt and install crack sealant material as directed by manufacturer. Do not overheat sealant. Apply sealant in a continuous motion so that sealant fills the crack from the bottom up without trapping air bubbles. Use a V-shaped squeegee or a shoe attached to the applicator wand to concentrate material over the crack. Finished application should fill entire crack and leave an overband or band aid of sealant on the pavement surface over the crack. Width of overbands shall not exceed two inches on either side of the crack, and not exceed 1/8inch in depth on surface of pavement. Do not leave overbands in parking areas or areas frequently walked on by pedestrians. Any crack sealer showing settling, shrinkage, or a depression in excess of 1/4 inch below the pavement surface shall be refilled.

C. Sealant shall be protected from being picked up or pulled out of cracks. Protect curing sealant from construction traffic. Reopen lane to traffic only after material has cured sufficiently to be stable under traffic. Apply blotter agents as required to keep material from tracking after lane has been reopened to traffic.

END OF SECTION 02711

SECTION 02713 SLURRY SEAL

1.1 DESCRIPTION

A. The work of this section consists of mixing and applying slurry seal surfacing to the prepared road surfaces.

1.2 REFERENCES

A. This specification is based on the State of California, Department of Transportation Standard Specifications, July 1995 or latest edition. Contractor shall have a copy of this document (or equivalent standard specifications from the WA Department of Transportation) available on the job site.

PART 2 PRODUCTS

2.1 ASPHALTIC EMULSION

A. Asphaltic emulsion shall be a quick-setting type, Grade QS1h (anionic) or Grade CQS1h (cationic) conforming to the requirements of Section 94, “Asphaltic Emulsions”, State of California, Department of Transportation, Standard Specifications, July 1995 or latest edition. The Contractor has the option of selecting the grade of asphaltic emulsion.

2.2 WATER

A. Water shall be of such quality that the asphalt will not separate from the emulsion before the slurry seal is in place in the work. If necessary for workability, a set-control agent that will not adversely affect the slurry seal may be used.

2.3 AGGREGATE

A. Aggregate shall consist of rock dust and plaster sand or other sands of similar nature, except that 100% of any aggregate or combination of aggregates, larger than the No.

50 sieve size, used in the mixture, shall be obtained by crushing rock. The material shall be free from vegetative matter and other deleterious substances. Aggregate shall be free of caked lumps and oversize particles.

B. The percentage composition, by mass of the aggregate, shall conform to the following gradings as determined by California Test 202, modified by California Test 105, when there is a difference in specific gravity of 0.2 or more between blends of difference aggregates.

AGGREGATE GRADATION

Percentage Passing

Sieve Sizes Type I Type II Type III 3/8 in. - 100 100 No. 4 100 94 -100 70 - 90

No. 8 90 -100 65 - 90 45 - 70 No. 16 60 - 90 40 - 70 28 - 50 No. 30 40 - 65 25 - 50 19 - 34 No. 200 10 - 20 5 - 15 5 - 15

C. The aggregate shall also conform to the following:

QUALITY REQUIREMENTS

California Requirements

Tests Test Type I Type II Type III Sand

Equivalent 217 45 min. 55 min. 60 min.

Durability Index 229 55 min. 55 min. 55 min.

D. Alternative Quality Requirements: Contractor may at his/her discretion, submit for approval by the Contracting Officer, equivalent quality requirements which conform to the Department of Transportation in the state in which the work will be completed.

E. If the results of the aggregate grading do not meet the gradation specified, the slurry seal represented by the test shall be removed.

F. If the result of the Sand Equivalent test for aggregate does not meet the requirement specified, the slurry seal represented by the test shall be removed.

2.4 MIX DESIGN

A. The Contractor shall submit a laboratory report of tests and the proposed mix design, covering the specified material to be used on the project, to the Contracting Officer for approval. The percentage of asphalt emulsion proposed in the mix design shall be within the percentage range specified in paragraph 2.5, Proportioning.

B. The tests and mix design shall be performed by a laboratory capable of performing the applicable International Slurry Seal Association (ISSA) tests. The proposed slurry seal mixture shall conform to the requirements specified when tested in accordance with the following tests:

SLURRY SEAL MIXTURE REQUIRMENTS

Test ISSA Test Requirement

Slurry Seal Consistency, cm T 106 30 max.

Wet Stripping T 113 Pass Compatibility T 115 Passa Cohesion Testb, kg - cm within one hr.

T 139 20 min.

Wet Track Abrasion, gm/ft2 T 100 75 max.

a Mixing test must pass at the maximum expected air temperature at the project site during application.

b Using project source aggregate and asphaltic emulsion and set-control agents if used.

C. The original laboratory report shall be signed by the laboratory that performed the tests and mix design and shall show the results of the tests on individual materials, comparing the test results to those required by the specifications. The report shall clearly show the proportions of aggregate, filler (as determined from the tests, minimum and maximum), water (minimum and maximum), asphalt solids content, based on the dry weight of aggregate, and set-control agent usage. Previous laboratory reports covering the same materials may be accepted provided they are made during the same calendar year.

D. Once the proportions of materials to be used are approved by the Contracting Officer, no substitution of other material will be permitted unless the materials proposed for substitution are first tested and a laboratory report is submitted for the substituted design as specified above. Substituted materials shall not be used until the mix design for those materials is approved by the Contracting Officer.

2.5 PROPORTIONING

A. Aggregate, asphaltic emulsion, water and additives, including set-control agent if used, shall be proportioned, by volume, utilizing the mix design approved by the Contracting Officer. If more than one kind of aggregate is used, the correct amount of each kind of aggregate used to produce the required grading shall be proportioned separately, prior to adding the other materials of the mixture, in a manner that will result in a uniform and homogeneous blend.

B. The completed mixture, after addition of water and any set-control agent used, shall be such that the slurry seal mixture has proper workability and (a) will permit traffic, not controlled with pilot cars, on the slurry seal within one hour after placement without the occurrence of bleeding, raveling, separation or other distress, and (b) prevent development of bleeding, raveling, separation or other distress within 15 days after placing the slurry seal.

C. Asphaltic emulsion shall be added at a rate within the following ranges of percent, by weight of dry aggregate shown below. The exact rate will be determined by the Contracting Officer from the approved design asphalt binder content, and the asphalt solids content of the asphaltic emulsion furnished.

Type of Slurry

Seal Mixture

Range (%)

I 15 - 20

II 12 - 18

III 10 - 15

D. The Contractor shall furnish an aggregate moisture determination for every 2 hours of operation or maintain the moisture content to within a maximum daily variation of ±0.5%.

E. The aggregate shall be proportioned using a belt feeder operated with an adjustable cutoff gate. The height of the gate opening shall be readily determinable. The emulsion shall be introduced into the mixer by a positive displacement pump. Variable rate emulsion pumps, if used, shall be equipped with a means to seal the adjusting unit in its calibrated condition. Water shall be introduced into the mixer through a meter registering in gallons delivered.

F. Uniformity of distribution of asphalt will be determined by extraction tests in accordance with California Test 310. The bitumen ratio (pounds of asphalt per 100 pounds of dry aggregate) shall not vary more than 0.5-pounds of asphalt above or 0.5-pounds of asphalt below the amount designated by the Contracting Officer. This requirement shall apply to samples taken from any location or operation designated by the Contracting Officer.

G. The delivery rate of aggregate and emulsion, per revolution of the aggregate feeder, shall be calibrated at the appropriate gate settings for each mixer-spreader truck used on the project in accordance with California Test 109 and the requirements of these specifications.

H. The aggregate belt feeder shall deliver aggregate to the pug mill mixer with such volumetric consistency that the deviation for any individual aggregate delivery rate check-run shall not exceed 2.0% of the average of three (3) runs of at least three (3) tons each in duration. The emulsion pump shall deliver emulsion to the pug mill with such volumetric consistency that the deviation for any individual delivery rate check-run shall be within 2.0% of the mathematical average of three (3) runs of at least 500 gallons each in duration.

I. Check-runs shall be performed for each aggregate using a vehicle scale that has been tested and approved in accordance with California Test 109.

J. The emulsion storage, located immediately before the emulsion pump, shall be equipped with a device, which will automatically shut down the power to the emulsion pump and aggregate belt feeder when the level of stored emulsion is lowered.

K. A temperature-indicating device shall be installed in the emulsion storage tank at the pump suction level. The device shall indicate temperature of the emulsion and shall be accurate to ±5º F.

L. The belt delivering the aggregate to the pug mill shall be equipped with a device to monitor the depth of aggregate being delivered to the pug mill. The device for monitoring depth of aggregate shall automatically shut down the power to the aggregate belt feeder whenever the depth of aggregate is less that 70% of the target depth of flow. An additional device shall monitor movement of the aggregate belt by detecting revolutions of the belt feeder. The devices for monitoring no flow or belt movement, as the case may be, shall automatically shut down the power to the aggregate belt when aggregate belt movement is interrupted. The device to detect revolutions of the belt feeder will not be required when aggregate delivery belt in an integral part of its drive chain.

M. To avoid shutdowns caused by normal fluctuations in delivery rates, a delay of three

(3) seconds between sensing less than desirable storage levels of aggregate or emulsion and shutdown of the proportioning operation will be permitted.

2.6 MIXING AND SPREADING EQUIPMENT

A. The slurry seal shall be mixed in continuous pug mill mixers of adequate size and power for the type of slurry seal to be placed. All indicators required in paragraph 2.5, Proportioning, shall be in working order prior to commencing mixing and spreading operations.

B. Mixer-spreader trucks shall be equipped to proportion emulsion, water, aggregate and set-control additives by volume. All rotating and reciprocating equipment on mixer-spreader trucks shall be covered with metal guards.

C. The mixer-spreader truck shall not be operated unless all low-flow and no-flow warning devices and revolution counters are in good working condition and functioning and all metal guards are in place. All indicators required by these special provisions shall be visible while walking alongside the mixer-spreader truck.

D. Aggregate feeders shall be connected directly to the drive on the emulsion pump. The drive shaft of the aggregate feeder shall be equipped with a revolution counter reading to the nearest full revolution of the aggregate delivery belt.

E. At least two (2) operational spreader trucks shall be available at the job site during the spreading operation except when continuous placement type mixer-spreader trucks are used.

F. The slurry mixture shall be uniformly spread by means of a controlled spreader box conforming to the following requirements:

1. The spreader shall be capable of spreading a traffic lane width and shall have strips of flexible rubber belting or similar material on each side of the spreader box and in contact with the pavement to positively prevent loss of slurry from the box. Spreader boxes over 7.5 feet in width shall have baffles, reversible motor driven augers, or other suitable means, to ensure uniform application on super-elevated sections and shoulder slopes. Spreader box skids shall be maintained in such manner as to prevent chatter (wash boarding) in the finished mat.

2. Rear flexible strike-off blades shall make close contact with the pavement and shall be capable of being adjusted to the various crown shapes so as to apply a uniform slurry seal.

3. Flexible drags, to be attached to the rear of the spreader box, shall be provided as directed by the Contracting Officer. All drags and strike-off blades shall be cleaned or changed daily if problems with cleanliness and longitudinal scouring occur.

4. The spreader box shall be clean, free of all slurry seal and emulsion, at the start of each work shift.

5. Slurry mixture, to be spread in areas inaccessible to the controlled spreader box, may be spread by other approved methods.

PART 3 EXECUTION

3.1 SURFACE PREPARATION

A. Remove existing pavement markers in the centerline. Existing markers shall be masked off and protected during the seal coat operations.

B. Before placing the slurry seal, the pavement surface shall be cleaned by sweeping, flushing or other means necessary to remove all loose particles of paving, all dirt and all other deleterious material.

C. Delineate the existing striping with temporary raised pavement markers before placing the slurry seal and after the brooming operation. See Section 02765 - Traffic Markings.

3.2 PLACING

A. The slurry mixture shall be uniformly spread on the existing surfacing within the rate specified, without spotting, re-handling or otherwise shifting of the mixture.

B. Slurry seal shall not be placed when the atmospheric temperature is below 50º F or during unsuitable weather.

C. Slurry seal shall be spread at a rate within the following ranges shown below, in pounds of dry aggregate per square yard. The exact rate shall be determined by the Contracting Officer. The completed spread shall be within 10% of the rate determined by the Contracting Officer.

SLURRY SEAL APPLICATION RATE

Type of Slurry Seal Mixture

Range (pounds of aggregate per yd2)

I 8 - 12

II 10 - 15

III 20 - 25

D. Longitudinal joints shall correspond with the edges of existing traffic lanes. Other patterns of longitudinal joints may be permitted, if the patterns will not adversely affect the quality of the finished product, as determined by the Contracting Officer.

E. Through traffic lanes shall be spread in full lane width units only. Longitudinal joints, common to two (2) traffic lanes, shall be butt joints with overlaps not to exceed 3 inches. Building paper shall be placed at transverse joints, over previously placed slurry seal, or, other suitable methods shall be used to avoid double placement of slurry seal. Hand tools shall be available in order to remove spillage. Ridges or bumps in the finished surface will not be permitted.

F. The mixture shall be uniform and homogeneous after spreading on the existing surfacing and shall not show separation of the emulsion and aggregate after setting.

G. Adequate means shall be provided to protect the slurry seal from damage by traffic until such time that the mixture has cured sufficiently so that the slurry seal will not adhere to and be picked up by the tires of vehicles.

END OF SECTION 02713

SECTION 02765 TRAFFIC MARKINGS

1.1 DESCRIPTION

A. The work of this section consists of marking all traffic markings prior to applying seal coats so that they can be reapplied in same locations after seal coating work is complete. Contractor shall furnish and reapply all traffic markings disturbed by seal coat work.

1.2 SUBMITTALS

A. As specified in Section 01010.

B. Certificate from manufacturer that materials meet requirements specified.

1.3 QUALITY ASSURANCE

A. Traffic markings shall be in accordance with ANSI D6.1-89 (MUTCD).

1.4 PROJECT CONDITIONS

A. Apply traffic markings only during daylight hours, when air and pavement temperatures exceed 50 degrees F, weather conditions are favorable, and surface is clean and dry.

PART 2 PRODUCTS

2.1 PAINT

AASHTO M248-86, white, yellow or blue traffic paint as specified in WA State Department of Transportation requirements.

2.2 GLASS BEADS

AASHTO M247-81, Type 1, moisture resistant with flotation properties.

PART 3 EXECUTION

3.1 PREPARATION

A. Clean area by brooming, airblasting, or other acceptable method.

3.2 PATTERNS

A. Lines shall be 4, 6, or 12 inches wide, plus or minus 1/4 inch. Reestablish all existing markings using same locations, symbols size and dimensions following paving work.

3.3 PAINT

A. Line Location: Before placing paint, mark location by placing spots of paint at designated intervals or use temporary raised traffic markers to ensure accurate location of traffic lines.

B. Equipment: Spray machine equipped with mechanical agitator, multiple applicators, and automatic skip control, capable of painting a clean-edged stripe of the designated width. Bead dispenser shall be directly behind and synchronized with paint applicator. Spray nozzle and bead dispenser shall be shielded to prevent over spraying. Use adequate hand operated equipment in areas not accessible to striping machine.

C. Minimum Application Rates:

A. 4-Inch Traffic Stripes: Solid, 16.5 gallons per mile; broken, 6.2 gallons per mile.

B. Legends and Symbols: 0.01 gallon per square foot.

C. Glass beads: 5.5 pounds for each gallon of paint.

3.4 ACCEPTANCE

A. Markings shall be accurately placed, and appear clean and uniform day and night.

Unsatisfactory markings shall be corrected at no additional expense to the Government.

3.5 PROTECTION

A. Protect pavement markings until dry or bonded.

END OF SECTION 02765