J.1 - Statement of Work (SOW) - July 2024 Updated Version.docx

STATEMENT OF WORK

GAOA VIRGINIA LAKES RESTROOM REPAIR

1.1 SCOPE OF CONTRACT

Description of work: To repair the double vault style restroom located in the parking lot of Virginia Lakes in the Bridgeport Ranger District on the Humboldt-Toiyabe National Forest. This work includes removal and replacement of all roof flashing (or partial replacement if similar flashing can be found), treatment of shake roof shingles (as well as replacement of individual rotten shingles), replacement of 2 metal doors and door frames (along with the new door hardware), trimming excess bolt studs, painting existing 4” x 6” posts, replacing 2 manhole covers, and the construction of 3 gravel based ADA accessible parking spaces with a concrete path leading from the parking spaces to the restroom.

Option items include:

1. Replacement of the two 12” x 10’ logs supporting the “No Swimming” sign,

2. Painting 4 picnic tables (5 wooden boards measuring 2” x 12” x 8’), and

3. Replacement of 4 pedestal style cooking grills.

1.2 PROJECT LOCATION

The project is located on the Humboldt‐Toiyabe National Forest, Bridgeport Ranger District, approximately 15 miles south of Bridgeport, CA on Virginia Lakes Rd W. The project location is at coordinates 38.04810 N, 119.26530 W.

1.3 SITE INFORMATION AND LIMITATIONS

The following site conditions are considered incidental to the contract and the contractor will not be paid directly for any of the following items:

1) Parking lot will be open to visitors during construction.

2) Contractor shall provide two porta-potties that will be serviced once a week for use by the public during construction.

3) Permits required by County, State, or Federal laws or regulations shall be obtained by the Contractor.

4) Contractor shall provide adequate signing and barricades and take necessary safety measures to protect the public during all construction operations. Contractor shall minimize disturbance of all undisturbed areas.

5) Contractor shall dispose construction debris and/or waste materials off-site at an approved waste facility.

6) Work will not occur on the weekends near Memorial Day, July 4th, and Labor Day.

1.4 WORK CAMPS, STAGING AND STORAGE AREAS

Areas for staging operations and storage of materials shall be approved by the COR. The Contractor must request in writing for approval from the COR to stage trailers on site. No overnight camping will be allowed on site unless approved by the COR.

1.5 INSPECTION OF WORKSITE

The contractor acknowledges they have taken the necessary steps to ascertain the nature and location of work and have investigated and satisfied themselves as to the general and local conditions that can affect the work or its cost. Any failure of the contractor to take the actions described and acknowledged in this paragraph will not relieve the Contractor from the responsibility of estimating properly the difficulty and cost of successfully performing the work, or for proceeding to successfully perform the work without additional expenses to the government.

1.6 START DATE

September 18, 2024, to November 03, 2024 (After notice to proceed)

1.7 CONTRACT TIME

Base Bid: 46 Calendar Days (estimated)

1.8 SPECIFICATIONS

Below is a list of specifications specific to each aspect of the project. Some sections in the schedule of items refer to other sections not listed and are subsidiary to or are included in payment for other pay items in this contract. These items are considered incidental, and no additional compensation will be made.

Section 011250 – Measurement and Payment Section 011900 – Mobilization Section 013300 – Submittal Procedures Section 014100 – Quality Control Section 022450 – Grading Section 024100 – Waste Material Disposal Section 033540 – Concrete Sidewalk Section 073129 – Wood Shingles and Shake Section 076200 – Sheet Metal Flashing and Trim Section 081110 – Standard Steel Doors and Frames and Manhole Cover Section 087100 – Door Hardware Section 099111 – Exterior Painting Section 101400 – Signs Section 129300 – Site Furnishings Section 322622 – Precast Concrete Curb Stop

SECTION 011250 - MEASUREMENT AND PAYMENT

GENERAL

SUMMARY

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, labor, materials, equipment, and incidentals necessary to successfully complete the project will be considered as included in the payment for items shown. This section defines the method of measurements and basis of payment for work items listed in the Schedule of Items.

DETERMINATION OF QUANTITIES

The following measurements and calculations shall be used to determine contract quantities for payment.

For individual construction items, longitudinal and lateral measurements for area computations shall be made horizontally or corrected to horizontal measurement unless otherwise specified. Measurements for geotextiles, netting and erosion control blankets shall be along slope lines.

For Structures, they shall be measured according to neat lines shown on the drawings or as altered by the CO, in writing, to fit field conditions.

For items that are measured by the linear foot, such as pipe culverts, fencing, guardrail, piping, utilities, and underdrains, measurements shall be made parallel to the base or foundation upon which the structures are placed.

For aggregates weighed for payment, the tonnage shall not be adjusted for moisture content, unless otherwise provided for.

For standard manufactured items (such as fence, wire, plates, rolled shapes, pipe conduits) identified by gauge, weight, section dimensions, and so forth, such identifications shall be considered the nominal weights or dimensions. Unless controlled by tolerances in cited specifications, manufacturer's tolerances shall be accepted.

UNITS OF MEASUREMENT

Payment shall be by units defined and determined according to U.S. Standard measure and by the following:

Acre: Make longitudinal and transverse measurements for area computations horizontally.

50lb Bag: Measurement will be for the actual number of 50lb bags of standard bentonite grout.

94lb Bag: Measurement will be for the actual number of 94lb bags of standard cement or grout.

Cubic Yard (CY): A measurement computed by one of the following methods:

Excavation, Embankment, or Borrow. The measurement computed by the average end area method from measurements made longitudinally along a centerline or reference line.

Material in Place or Stockpile. The measurement computed using the dimensions of the in-place material.

Material in the Delivery Vehicle. The measurement computed using measurements of material in the hauling vehicles at the point of delivery. Vehicles shall be loaded to at least their water level capacity. Leveling of the loads may be required when vehicles arrive at the delivery point.

Each (EA): One complete unit, which may consist of one or more parts.

Gallons (GAL): The quantity shall be measured by any of the following methods:

Measured volume in container.

Metered volume by approved metering system.

Commercially package volume.

Hour (HR): Measurement will be for the actual number of hours (or fraction thereof) ordered by the Contracting Officer and performed by the contractor.

Linear Foot (LF): Measurement of work along its length from point-to-point; parallel to the base or foundation. Do not measure overlaps.

Lump Sum (LS): One complete unit.

Mile: Measured horizontally along the centerline of each roadway, approach, or ramp.

Pound (LB): For sacked or packaged material, measurement will be the net weight as packed by the manufacturer.

Square Foot (SF): Measured on a plane parallel to the surface being measured.

Square Yard (SY): Measured on a plane parallel to the surface being measured.

Ton: Measured as a short ton consisting of 2,000 pounds.

METHOD OF MEASUREMENT

One of the following methods of measurement for determining final payment is designated on the Schedule of Items for each pay item:

ACTUAL QUANTITIES (AQ) - These quantities are determined from actual measurements of completed work.

DESIGNED QUANTITIES (DQ) - These quantities denote the final number or units to be paid for under the terms of the contract. They are based upon the original design data available prior to advertising the project. Original design data include the preliminary survey information, design assumptions, calculations, drawings, and the presentation in the contract. Changes in the number of units shown in the Schedule of Items may be authorized under any of the following conditions:

As a result of changes in the work authorized by the CO.

As a result of the CO determining that errors exist in the original design that cause a pay item quantity to change by 15 percent or more.

As a result of the Contractor submitting to the CO a written request showing evidence of errors in the original design that cause a pay item quantity to change by 15 percent or more. The evidence must be verifiable and consist of calculations, drawings, or other data that show how the designed quantity is believed to be in error.

LUMP SUM QUANTITIES (LSQ) - These quantities denote one complete unit of work as required by or described in the contract, including necessary materials, equipment, and labor to complete the job. They shall not be measured.

STAKED QUANTITIES (SQ) - These quantities are determined from staked measurements prior to construction.

VEHICLE QUANTITIES (VQ) - These quantities are measured or weighed in hauling vehicles.

END OF SECTION 011250

SECTION 011900 - MOBILIZATION

PART 1 - GENERAL

1.1 SUMMARY

0. This item is intended to compensate the Contractor for operations including, but not limited to, those necessary for the movement of personnel, equipment, supplies, and incidentals to the project site; for payment of premiums for bonds and insurance for the project; and for any other work and operations which must be performed or costs that must be incurred incident to the initiation of meaningful work at the site and for which payment is not otherwise provided for under the contract.

MEASUREMENT AND PAYMENT

The measurement shall be lump sum for mobilization. Payment shall be as follows:

Bond premiums will be reimbursed after receipt of the evidence of payment.

50% of the lump sum, not to exceed 5% of the original contract amount, will be paid following completion of 5% of the original contract amount not including mobilization and bond premiums.

Payment of the remaining portion of the lump sum, up to 10% of the original contract amount, will be paid following completion of 10% of the original contract amount not including mobilization and bond premiums.

Any portion of the lump sum in excess of 10% of the original contract amount will be paid after final acceptance.

Progress payments for mobilization and preparatory work shall be subject to retainage.

END OF SECTION 011900

SECTION 013300 - SUBMITTAL PROCEDURES

1. GENERAL

SUMMARY

This Section includes administrative and procedural requirements for submitting Product Data, and other miscellaneous submittals. See Table 013300-1 for a summary of required submittals.

See other specification section within this package for additional requirements on submittal.

SUBMITTAL PROCEDURES

Coordination: Coordinate preparation and processing of submittals with performance of construction activities.

Coordinate transmittal of different types of submittals for related parts of the Work so processing will not be delayed because of need to review submittals concurrently for coordination.

The Contracting Officer (CO) reserves the right to withhold action on a submittal requiring coordination with other submittals until related submittals are received.

Processing Time: Allow enough time for submittal review, including time for re-submittals, as follows. Time for review shall commence on CO's receipt of submittal.

Initial Review: Allow 14 days for initial review of each submittal. Allow additional time if processing must be delayed to permit coordination with subsequent submittals. CO will advise Contractor when a submittal being processed must be delayed for coordination.

If intermediate submittal is necessary, process it in same manner as initial submittal.

Allow 14 days for processing each re-submittal.

No extension of the Contract Time will be authorized because of failure to transmit submittals enough in advance of the Work to permit processing.

Identification:

Indicate name of firm or entity that prepared each submittal on label or title block.

Provide a space on label or beside title block to record Contractor's review and approval markings and action taken by CO.

Include the following information on label for processing and recording action taken:

Project name.

Date.

Name and address of Contractor.

Name of manufacturer.

Unique identifier, including revision number.

Number and title of appropriate Specification Section.

Drawing number and detail references, as appropriate.

If more than one item is shown on submittal sheet, identify item.

Deviations: Highlight, encircle, or otherwise identify deviations from the Contract Documents on submittals.

MEASUREMENT AND PAYMENT

No separate measurement and/or payment will be made for this section. Payment shall be included with work shown in the schedule of items.

PRODUCTS

ACTION SUBMITTALS –

General: Prepare and submit Action Submittals required by individual Specification Sections.

Product Data: Collect information into a single submittal for each element of construction and type of product or equipment.

If information must be specially prepared for submittal because standard printed data are not suitable for use, submit as Shop Drawings, not as Product Data.

Mark each copy of each submittal to show which products and options are applicable.

Include the following information, as applicable:

Manufacturer's written recommendations.

Manufacturer's product specifications.

Manufacturer's installation instructions.

Manufacturer's catalog cuts.

Compliance with recognized trade association standards.

Compliance with recognized testing agency standards.

Contractor's Construction Schedule: The contractor shall submit a Construction Schedule, for approval by CO, in accordance with the contract provisions within 30 days of commencement of work.

EXECUTION

GENERAL

Review each submittal and check for compliance with the Contract Documents. Note corrections and field dimensions. Mark with approval stamp before submitting to CO.

Approval Stamp: Stamp each submittal with a uniform, approval stamp. Include Project name and location, submittal number, Specification Section title and number, name of reviewer, date of Contractor's approval, and statement certifying that submittal has been reviewed, checked, and approved for compliance with the Contract Documents.

Submittals not required by the Contract Documents will not be reviewed and may be discarded.

Substitutions – Whenever materials, products, and equipment are listed by name or brand in the specifications and/or on the drawings, it is used as a measure of quality, utility, or standard. If the Contractor prefers to use any other brand or manufacturer of same quality, appearance and utility to that specified, he shall request substitution as provided below, not less than 30 days before the planned installation of the item. The Contracting Officer will approve or disapprove the request for substitution.

Requests for substitutions will only be considered if contractor submits the following:

Complete technical data including drawings, complete performance specifications, test data, samples and performance tests of the article proposed for substitution. Submit additional information if required by Contracting Officer. All items in the above information shall be circled, tagged, or marked in some way to indicate all deviations or differences which the proposed item differs from the originally specified item.

Similar data as above for item originally specified. All items shall be marked to identify where/how the proposed substitution will differ.

A statement by the Contractor that the proposed substitution is in full compliance with the contract documents, applicable codes, and laws.

The Contractor shall be responsible for any effect upon related work in the project for any substitution and shall pay any additional costs generated by any substitutions.

SUBMITTAL SCHEDULE – Submittals shall be made as required by and called for in the drawings and specifications. The following table is a summary of the required submittals for the project - the table is to assist the Contractor and may not be all inclusive – additional submittals may be required by specific specifications:

TABLE 013000-1

END OF SECTION 013300

SECTION 014100 – QUALITY CONTROL

PART 1 - GENERAL

This work shall consist of providing quality control in conformance with the inspection, testing, and product certification requirements of this contract to ensure compliance with the drawings and specifications. The Contractor shall provide all personnel, equipment, tests, and reports necessary to meet the requirements of the contract.

QUALITY CONTROL

The Contractor shall provide and maintain a quality control system that will ensure all services, supplies, and construction work required under this contract conforms to the contract requirements. The Contractor shall perform, or cause to be performed, the sampling, inspection, and testing required to substantiate that all services, supplies, and construction conform to the contract requirements.

SUBMITTALS

Contractor Quality Control Plan. This plan should include quality of project management, concrete, aggregate, compaction, and safety.

MEASUREMENT AND PAYMENT

No separate payment will be made for the work included under this section; rather payment shall be considered to be included in the items of work listed in the Schedule of Items.

EXECUTION

QUALITY CONTROL SYSTEM

General: Perform required testing, inspections, sampling, and similar services per direction specified in the contract drawings and specifications and in accordance with established industry standards.

CONTRACTOR QUALITY CONTROL PLAN

At the time of the preconstruction conference, the Contractor shall submit for approval a written Contractor Quality Control Plan.

If the plan requires any revisions or corrections, the Contractor shall resubmit the plan within 10 days.

The Government reserves the right to require changes in the plan during the contract period as necessary.

No change in the approved plan may be made without written concurrence by the Contracting Officer.

At a minimum, the plan shall include the following:

A list of personnel responsible for quality control and assigned duties. Include each person's qualifications.

A copy of a letter of direction to the Contractor's Quality Control Supervisor outlining assigned duties.

Names, qualifications, and descriptions of laboratories to perform sampling and testing, and samples of proposed report forms.

Methods of performing, documenting, and enforcing quality control of all work.

Methods of monitoring and controlling environmental pollution and contamination as required by all applicable regulations and laws.

PERMITS, LICENSES, AND CERTIFICATES

For Contracting Officer’s records, submit copies of permits, licenses, certifications, inspection reports, releases, jurisdictional settlements, notices, receipts for fee payments, judgments, correspondence, records, and similar documents, established for compliance with standards and regulations relevant to the on performance of the work.

END OF SECTION 014100

SECTION 022450 - GRADING

SUMMARY

Includes grading and shaping the approximate 900 square foot accessible gravel parking area next to the restroom.

MEASUREMENT AND PAYMENT

The measurement shall be lump sum for grading.

PRODUCTS

FILLS AND EMBANKMENTS

Use existing gravel in parking lot to shape and surface the 3 accessible parking areas. Material used must be clean and free from vegetation, pieces of timber, muck, and other foreign material.

Rocks over 6 inches in largest dimension not permitted in the top 2 feet of fill. Rocks over 4 inches in largest dimension not permitted in the top 6 inches of fill.

No frozen material permitted in the fill.

EXECUTION

ROUGH GRADING

Uniformly smooth grade excavated and filled sections and adjacent transition areas.

Grade to 4 inches below finish grade elevation for all areas to be finished with top soil.

Grade finished surface for other areas reasonably smooth, compacted, and free from irregular surface changes.

The degree of finish shall be that ordinarily obtainable from either blade-grader or scraper operations.

The finished surface on which roadway or parking areas are to be placed shall not vary more than 0.05 foot from the established grade. Elevation shall provide for 4 inch compacted aggregate surfacing.

Other surfaces shall not vary more than 0.10 foot from the established grade.

Slope grade away from structures minimum 6 inches in 10 feet for a distance of 10 feet minimum.

END OF SECTION 022450

July 2024

SECTION 024100 - WASTE MATERIAL DISPOSAL

PART 1 – GENERAL

0. SUMMARY

0. This section includes the loading, handling, hauling, and placing of excess construction and demolition debris to an approved landfill.

MEASUREMENT AND PAYMENT

There will be no separate measurement or payment for work in this Section. Waste material disposal is considered incidental to other items of work shown in the Schedule of Items.

EXECUTION

WASTE MATERIAL TO BE HAULED TO A LANDFILL

All demolition materials, garbage, and other refuse generated shall be removed from the project site and legally disposed off of Government property in an approved landfill.

END OF SECTION 024100

SECTION 033540 - CONCRETE SIDEWALK

SUMMARY

This work includes the construction of an approximately 4 ft by 70 ft by 4-inch-thick concrete ramp that begins at the edge of the furthest ADA parking slip and terminates at the northern entrance of the double vault restroom building in the Virginia Lakes parking lot. The sidewalk is to join the existing concrete slab at the entrance of the building and is intended to accommodate less-able recreationists. Dowelling is to be added between the new walkway and existing concrete to alleviate frost heaving.

SUBMITTALS

Product Data:

Concrete mix design Aggregate for concrete Aggregate for sidewalk base and Sidewalk backfill

PRODUCTS

2.1 CONCRETE

Concrete shall be composed of Portland cement, fine aggregate, coarse aggregate, air entraining agent, and water mixed in proportions approved by the Contracting Officer. The concrete shall have a minimum compressive strength of 3750 psi at 28 days.

All concrete shall be "Class A" concrete, unless otherwise specified.

Class A Concrete Mix

330 lb. rounded CA or 305 lb. angular CA

*Aggregate weight given in saturated surface dry condition. (Specific gravity of aggregate to be approximately 2.65 and fineness modulus to be 2.75.)

*Aggregate weight given in saturated surface dry condition. (Specific gravity of aggregate to be approximately 2.65 and fineness modulus to be 2.75.)

The amount of water to be added to the mix shall be reduced by the amount of any excess moisture content in the fine aggregate to obtain the net water content.

Weight proportioning by the Contractor will be required for all concrete. Unless otherwise permitted, the cement shall be packed in bags containing 94 pounds net weight. Batches shall be used which do not require fractional bags of cement, except when a half-bag mix is permitted. The fine and coarse aggregate shall be weighed separately.

CEMENT

The cement shall be Portland cement, Type I, or Type II, and shall comply with ASTM C150. When high early strength cement is required, or permitted, it shall comply with ASTM C150, Type III.

The cement shall be shipped in the original manufacturer's packages and shall be in good condition when inspected by the Contracting Officer. The name and brand of the manufacturer and the type shall be plainly indicated thereon.

The Contractor shall add an air entraining agent to Type I, Type II, or Type III Portland cement. The Contracting Officer shall approve in writing the air entraining agent as well as the measuring and mixing procedure used by the Contractor. The Contracting Officer may require the Contractor to furnish a sample of the air entraining agent for testing purposes. All air entraining agents used shall be delivered in sealed containers with the manufacturer's name and type plainly indicated thereon.

The cement must be protected from rain and moisture, and any cement damaged by moisture or failure to meet any of the requirements of ASTM specifications shall be rejected and immediately removed from the work. All broken bags shall be rejected. Cement stored by the Contractor for a period longer than 60-days shall be inspected by the Contracting Officer before used on the work.

FINE AGGREGATE FOR SIDEWALK CONCRETE

Fine aggregate shall consist of clean, hard, durable, uncoated grains of sand, and shall be washed when necessary to obtain conformity with these specifications. Fine aggregate shall be well graded and when tested by means of laboratory sieves according to AASHTO T27 shall conform to the following requirements:

Fine Aggregate Grading

Fine aggregate shall not have deleterious substances in excess of the following percentages:

The above gradation represents the extreme limits which shall determine suitability for use from all sources of supply. The gradation from any one source shall be reasonably uniform and not subject to the extreme percentages of gradation specified above. Fine aggregate from different sources of supply shall not be mixed or stored in the same pile nor used alternately in the same class of construction or mix, without approval of the Contracting Officer.

COARSE AGGREGATE FOR SIDEWALK CONCRETE

Shall consist of gravel and be washed when necessary to obtain conformity with these specifications.

The maximum amounts of individual deleterious substances shall not exceed the following values:

Deleterious Substance Percentage by Weight

Other (such as alkali coated, friable, shale, or laminated) 3.0

An elongated piece is one whose length is more than five times its average thickness.

The maximum amount of any combination of the deleterious substances, other than thin or elongated pieces listed above, shall not exceed five percent by weight.

Coarse aggregate shall be well graded, and unless otherwise provided in the supplemental specifications, shall conform to the following grading requirements when tested with laboratory sieves, according to AASHTO T27.

Coarse Aggregate - "Standard" Gradation

Passing Sieves

Coarse Aggregate - "Alternate" Gradation (For use in heavily reinforced walls and walls less than 8" thick)

Sieve Designation Square Openings Percentage (%) by Weight Passing Sieves

If the alternate gradation for coarse aggregate is used, the Contractor must obtain prior approval in writing from the Contracting Officer.

WATER

Water shall be fresh, clean, and free from alkali (and other deleterious materials).

AGGREGATES FOR SIDEWALK SUBGRADE AND BACKFILL

Aggregate grade selection shall be Grading C with 75 % minimum Fractured faces meeting ASTM D5821 for the surface course of the parking area and Grading D for the base course under the sidewalk.

Table 033540-1, Crushed Aggregate Grading Requirements for Subbase and Base.

Percent Passing (AASHTO T27 and T11)

(Subbase) Grading B (Subbase) Grading C (Base) Grading D (Base) Grading E (Base)

1-1/2-inch

97-100

3/4-inch

3/8-inch

() The value in the parentheses is the allowable deviation (+ / - ) from the target values.

Liquid Limit, AASHTO T89 = 25 max. Plastic Limit, AASHTO T-90 = nonplastic.

Table 033540-2, Crushed Aggregate Grading Requirements for Surface Course.

Percent Passing (AASHTO T27and T11)

(Surface Course) Grading G (Surface Course)

1/2-inch

No. 8

() The value in the parentheses is the allowable deviation (+ / - ) from the target values.

Liquid Limit, AASHTO T 89 = 35 max, Plastic Index, AASHTO T90 = 2 to 9 if percent passing the No. 200 sieve is less than 12% and less than 2 if the percent passing the No. 200 sieve is greater than 12%.

If the plasticity index (PI) is greater than 0, the TV range for the No. 200 sieve size is 8-12 (4).

2.7 JOINTS

The sidewalk shall be divided into sections by control joints formed by a jointing tool. The control joints shall extend into the concrete at least 1/4 of the slab thickness. Joints shall match as nearly as possible adjacent joints in curb or pavements, be equally spaced, and not be spaced more than 10 feet. Spacing of expansion joints with 1/2 inch thick polyurethane sealant extending the full depth of the sidewalk shall not exceed 50 feet unless otherwise shown on the drawings. Approved polyurethane sealant is Sikaflex 1c-SL or approved equal.

Construction joints shall be formed around all appurtenances, such as manholes, utility poles, etc., which extend into and through the sidewalks. Premolded expansion joint filler 1/2 inch thick shall be installed in these joints. Expansion joint filler shall be installed between concrete sidewalks and any fixed structure such as a building or bridge. This expansion joint material shall extend to the full depth of the walk.

PART 3 – EXECUTION

GENERAL

1. The area for construction of the sidewalk shall be cleared and grubbed. The subgrade for the sidewalk shall be ripped 4 inches deep, compacted until there is no visible evidence of further consolidation, and shaped. Suitable material for subgrade shall be granular material or fine compatible soil free of excess moisture muck, frozen lumps, roots, sod, and other deleterious material. Remove all rock particles and hard earth clods larger than 3 inches in the longest dimension.

2. The aggregate base course shall be constructed and compacted to the thickness shown on the drawings. Minimum thickness shall be 4 inches compacted depth unless noted otherwise. When embankment or fill is necessary, subgrade shall be place incompacted layers not exceeding 6 inches.

3. MIXING AND SPREADING

A. Mix the aggregate and adjust the moisture content to obtain uniform moisture. Spread and shape the mixture on the prepared surface in a uniform layer not to exceed 6 inches in compacted thickness.

4. COMPACTING

A. Compact each layer of aggregate full width. Adjust the moisture content to a level suitable for compaction. Fill the interstices around rock with earth or other fine material as practical. Compact with four roller passes of a vibratory roller having a minimum dynamic force of 40,000 pounds (180 kilonewtons) impact per vibration and a minimum frequency of 1000 vibrations per minute. Compact until there is no visible evidence of further consolidation.

5. FINISH GRADING AND CLEANUP

A. Backfill and finish grade around sidewalk. Finish grading shall be crushed aggregate Grading C placed next to sidewalk from top of sidewalk and graded away for a minimum of 2 feet at a 2 to 5 percent slope. Blend into adjacent area beyond 2 feet.

B. When the installation has been completed, all debris and material not utilized shall be removed.

6. CONCRETE MIXING

A. Ready-Mixed Concrete: Measure, batch, mix, and deliver concrete according to ASTM C 94/C 94M and ASTM C 1116 and furnish batch ticket information.

a. When air temperature is between 85 and 90 deg F (30 and 32 deg C), reduce mixing and delivery time from 1-1/2 hours to 75 minutes; when air temperature is above 90 deg F (32 deg C), reduce mixing and delivery time to 60 minutes.

B. Project-Site Mixing: Measure, batch, and mix concrete materials and concrete according to ASTM C 94/C 94M. Mix concrete materials in appropriate drum-type batch machine mixer.

a. For mixer capacity of 1 cu. yd. (0.76 cu. m) or smaller, continue mixing at least 1-1/2 minutes, but not more than 5 minutes after ingredients are in mixer, before any part of batch is released.

b. For mixer capacity larger than 1 cu. yd. (0.76 cu. m), increase mixing time by 15 seconds for each additional 1 cu. yd. (0.76 cu. m).

c. Provide batch ticket for each batch discharged and used in the Work, indicating Project identification name and number, date, mixture type, mixture time, quantity, and amount of water added. Record approximate location of final deposit in structure.

7. FORMWORK

A. Design, erect, shore, brace, and maintain formwork, according to ACI 301, to support vertical, lateral, static, and dynamic loads, and construction loads that might be applied, until structure can support such loads.

B. Construct forms tight enough to prevent loss of concrete mortar.

C. Fabricate forms for easy removal without hammering or prying against concrete surfaces. Provide crush or wrecking plates where stripping may damage cast concrete surfaces. Provide top forms for inclined surfaces steeper than 1.5 horizontal to 1 vertical.

a. Install keyways, reglets, recesses, and the like, for easy removal.

b. Do not use rust-stained steel form-facing material.

8. JOINTS

A. General: Construct joints true to line with faces perpendicular to surface plane of concrete.

B. Contraction Joints in Slabs-on-Grade: Form weakened-plane contraction joints, sectioning concrete into areas as indicated. Construct contraction joints for a depth equal to at least one-fourth of concrete thickness as follows:

C. Grooved Joints: Form contraction joints after initial floating by grooving and finishing each edge of joint to a radius of 1/8 inch (3.2 mm). Repeat grooving of contraction joints after applying surface finishes. Eliminate groover tool marks on concrete surfaces.

9. CONCRETE PLACEMENT

A. Before placing concrete, verify that installation of formwork, reinforcement, and embedded items is complete and that required inspections have been performed.

B. Cold-Weather Placement: Comply with ACI 306.1 and as follows. Protect concrete work from physical damage or reduced strength that could be caused by frost, freezing actions, or low temperatures.

a. When average high and low temperature is expected to fall below 40 deg F (4.4 deg C) for three successive days, maintain delivered concrete mixture temperature within the temperature range required by ACI 301.

b. Do not use frozen materials or materials containing ice or snow. Do not place concrete on frozen subgrade or on subgrade containing frozen materials.

c. Do not use calcium chloride, salt, or other materials containing antifreeze agents or chemical accelerators unless otherwise specified and approved in mixture designs.

C. Hot-Weather Placement: Comply with ACI 301 and as follows:

a. Maintain concrete temperature below 90 deg F (32 deg C) at time of placement. Chilled mixing water or chopped ice may be used to control temperature, provided water equivalent of ice is calculated to total amount of mixing water. Using liquid nitrogen to cool concrete is Contractor's option.

b. Fog-spray forms, steel reinforcement, and subgrade just before placing concrete. Keep subgrade uniformly moist without standing water, soft spots, or dry areas.

10. FINISHING FORMED SURFACES

A. As-cast concrete texture imparted by form-facing material, arranged in an orderly and symmetrical manner with a minimum of seams. Repair and patch tie holes and defects. Remove fins and other projections that exceed specified limits on formed-surface irregularities.

B. Broom Finish: Apply a broom finish to exterior concrete platforms, steps, and ramps, and elsewhere as indicated.

a. Immediately after float finishing, slightly roughen trafficked surface by brooming with fiber-bristle broom perpendicular to main traffic route. Coordinate required final finish with Contracting Officer before application.

11. CONCRETE PROTECTING AND CURING

A. General: Protect freshly placed concrete from premature drying and excessive cold or hot temperatures. Comply with ACI 306.1 for cold-weather protection and ACI 301 for hot-weather protection during curing.

12. CONCRETE SURFACE REPAIRS

A. Defective Concrete: Repair and patch defective areas when approved by Contracting Officer. Remove and replace concrete that cannot be repaired and patched to Contracting Officer's approval.

PART 4 - MEASUREMENT AND PAYMENT

The measurement shall be lump sum for the construction of the concrete ramp in Item Number 033540.

END OF SECTION 033540

SECTION 073129 - WOOD SHINGLES AND SHAKES

SUMMARY

This work includes cleaning, treating, and replacing sections of rotten wood shakes on the roof of the restroom at the Virginia Lakes parking lot. The replacement shakes should match the existing shakes in terms of size, shape, color, type, and quality as best as possible. Assume 10% of the shakes on this 13 foot by 13 foot building need replacing.

SUBMITTALS

Product Data:

Oil based preservative treatment.

Replacement shakes

PROJECT CONDITIONS

Weather Limitations: Proceed with installation only when existing and forecasted weather conditions permit roofing to be performed according to manufacturer's written instructions and warranty requirements.

Install self-adhering sheet underlayment within the range of ambient and substrate temperatures recommended by manufacturer.

MEASUREMENT AND PAYMENT

The measurement and payment shall be lump sum for the cleaning, treating, and, if necessary, replacement of rotten shake in Item Number 073129.

PRODUCTS

ROOF SHAKES

Contractor will, within reason, match existing shakes in terms of shape, color, and size and submit for approval by the CO. Paragraph and subparagraphs below correspond to CSSB’s Certi-Split shakes.

WOOD TREATMENTS

Clean with diluted bleach if mold is present. If not, power washing with water will be sufficient to remove dust and dirt.

Preservative Treatment: Oil-base exterior wood stain for roofs or decks.

STAIN - Exterior, Semi-Transparent-Color Oil Based Stain:

Basis of Design Product X-100, Roof Grade Natural Seal Wood Protective, by American Building Restoration Products, 9720 South 60th Street, Franklin WI 1-800-346-7532 or a Government approved equal.

APPLICATION – Apply 3 coats with an appropriate brush or spray. Allow for adequate drying prior to applying next coat.

Identification: Attach a label to each bundle of shakes; identify manufacturer, references to model-code approval, type of product, grade, dimensions, and approved grading agency.

Include chemical treatment, method of application, purpose of treatment, and warranties available.

EXECUTION

EXAMINATION

Examine substrates, areas, and conditions, with Installer present, for compliance with requirements for installation tolerances and other conditions affecting performance of work.

Examine roof sheathing to verify that sheathing joints are supported by framing and blocking or metal clips and that installation is within flatness tolerances.

Verify that substrate is sound, dry, smooth, clean, sloped for drainage, and completely anchored; and that provision has been made for flashings and penetrations through roofing.

Proceed with installation only after unsatisfactory conditions have been corrected.

ROOF SHAKE INSTALLATION

Install wood shake roofing according to manufacturer's written instructions, recommendations in CSSB's "Design and Application Manual for New Roof Construction," and recommendations in NRCA's "The NRCA Roofing and Waterproofing Manual."

Install first course of wood shakes directly over starter course and in continuous straight-line courses across roof deck. Install second and succeeding courses of wood shakes in continuous straight-line courses across roof deck. Extend 1 inch (25 mm) over rake edge.

Install 18-inch- (455-mm-) wide strip of roof felt interlayment over top portion of first and each succeeding course. Set bottom edge of roof felt interlayment at a distance of twice the weather-exposure dimension above the shake butt. Stagger fasten to roof deck with felt underlayment nails.

Offset joints between shakes in succeeding courses a minimum of 1-1/2 inches (38 mm). Limit alignment of vertical joints in every third course to not exceed 10 percent of joints.

Space shakes a minimum of 3/8 inch (10 mm) and a maximum of 5/8 inch (16 mm) apart.

Fasten each shake with 2 nails spaced 3/4 to 1 inch (19 to 25 mm) from edge of shake and 1-1/2 to 2 inches (38 to 50 mm) above butt line of subsequent course. Drive fasteners flush with top surface of shakes without crushing wood.

Maintain weather exposure of [5-1/2 inches (140 mm) for 18-inch- (455-mm-)] [7-1/2 inches (190 mm) for 18-inch- (455-mm-)] [7-1/2 inches (190 mm) for 24-inch- (610-mm-)] [10 inches (255 mm) for 24-inch- (610-mm-)] <Insert exposure> long shakes.

END OF SECTION 073129

SECTION 076200 - SHEET METAL FLASHING AND TRIM

SUMMARY

Work Includes:

Install flashing and drip edge where missing that matches the existing material in regard to dimension, grade, and color. It is up to the discretion of the contractor to decide if replacement of all flashing is more efficient.

ACTION SUBMITTALS

Product Data: For both the drip edge and continuous flashing.

MEASUREMENT AND PAYMENT

The measurement shall be lump sum for the flashing in Item Number 076200. PRODUCTS

PRODUCTS

PERFORMANCE REQUIREMENTS

General: Sheet metal flashing and trim assemblies shall withstand wind loads, structural movement, thermally induced movement, and exposure to weather without failure due to defective manufacture, fabrication, installation, or other defects in construction. Completed sheet metal flashing and trim shall not rattle, leak, or loosen, and shall remain watertight.

Thermal Movements: Allow for thermal movements from ambient and surface temperature changes.

MISCELLANEOUS MATERIALS

General: Provide materials and types of fasteners, solder, protective coatings, sealants, and other miscellaneous items as required for complete sheet metal flashing and trim installation and as recommended by manufacturer of primary sheet metal or manufactured item unless otherwise indicated.

Fasteners: Wood screws, annular threaded nails, self-tapping screws, self-locking rivets and bolts, and other suitable fasteners designed to withstand design loads and recommended by manufacturer of primary sheet metal or manufactured item.

General: Blind fasteners or self-drilling screws, gasketed, with hex-washer head.

Exposed Fasteners: Heads matching color of sheet metal using plastic caps or factory-applied coating. Provide metal-backed EPDM or PVC sealing washers under heads of exposed fasteners bearing on weather side of metal.

Blind Fasteners: High-strength aluminum or stainless-steel rivets suitable for metal being fastened.

Spikes and Ferrules: Same material as gutter; with spike with ferrule matching internal gutter width.

Fasteners for Zinc-Coated (Galvanized) Steel Sheet: Series 300 stainless steel or hot-dip galvanized steel according to ASTM A 153/A 153M or ASTM F 2329.

Solder:

For Zinc-Coated (Galvanized) Steel: ASTM B 32, Grade Sn50, 50 percent tin and 50 percent lead or Grade Sn60, 60 percent tin and 40 percent lead.

Sealant Tape: Pressure-sensitive, 100 percent solids, polyisobutylene compound sealant tape with release-paper backing. Provide permanently elastic, nonsag, nontoxic, nonstaining tape 1/2 inch wide and 1/8 inch thick.

Elastomeric Sealant: ASTM C 920, elastomeric silicone polymer sealant; of type, grade, class, and use classifications required to seal joints in sheet metal flashing and trim and remain watertight.

Butyl Sealant: ASTM C 1311, single-component, solvent-release butyl rubber sealant; polyisobutylene plasticized; heavy bodied for hooked-type expansion joints with limited movement.

Bituminous Coating: Cold-applied asphalt emulsion according to ASTM D 1187.

Asphalt Roofing Cement: ASTM D 4586, asbestos free, of consistency required for application.

FABRICATION, GENERAL

General: Custom fabricate sheet metal flashing and trim to comply with details shown and recommendations in cited sheet metal standard that apply to design, dimensions, geometry, metal thickness, and other characteristics of item required. Fabricate sheet metal flashing and trim in shop to greatest extent possible.

Obtain field measurements for accurate fit before shop fabrication.

Form sheet metal flashing and trim to fit substrates without excessive oil canning, buckling, and tool marks; true to line, levels, and slopes; and with exposed edges folded back to form hems.

Conceal fasteners and expansion provisions where possible. Do not use exposed fasteners on faces exposed to view.

Expansion Provisions: Form metal for thermal expansion of exposed flashing and trim.

Form expansion joints of intermeshing hooked flanges, not less than 1 inch deep, filled with butyl sealant concealed within joints.

Use lapped expansion joints only where indicated on Drawings.

Sealant Joints: Where movable, nonexpansion-type joints are required, form metal to provide for proper installation of elastomeric sealant according to cited sheet metal standard.

Fabricate cleats and attachment devices from same material as accessory being anchored or from compatible, noncorrosive metal.

Fabricate cleats and attachment devices of sizes as recommended by cited sheet metal standard for application, but not less than thickness of metal being secured.

Seams: Fabricate nonmoving seams with flat-lock seams. Tin edges to be seamed, form seams, and solder.

1. EXECUTION

INSTALLATION, GENERAL

General: Anchor sheet metal flashing and trim and other components of the Work securely in place, with provisions for thermal and structural movement. Use fasteners, solder, protective coatings, separators, sealants, and other miscellaneous items as required to complete sheet metal flashing and trim system.

Install sheet metal flashing and trim true to line, levels, and slopes. Provide uniform, neat seams with minimum exposure of solder, welds, and sealant.

Install sheet metal flashing and trim to fit substrates and to result in watertight performance. Verify shapes and dimensions of surfaces to be covered before fabricating sheet metal.

Space cleats not more than 12 inches (300 mm) apart. Attach each cleat with at least two fasteners. Bend tabs over fasteners.

Install exposed sheet metal flashing and trim with limited oil canning, and free of buckling and tool marks.

Torch cutting of sheet metal flashing and trim is not permitted.

Metal Protection: Where dissimilar metals contact each other, or where metal contacts pressure-treated wood or other corrosive substrates, protect against galvanic action or corrosion by painting contact surfaces with bituminous coating or by other permanent separation as recommended by sheet metal manufacturer or cited sheet metal standard.

Coat concealed side of sheet metal flashing and trim with bituminous coating where flashing and trim contact wood, ferrous metal, or cementitious construction.

Underlayment: Where installing sheet metal flashing and trim directly on cementitious or wood substrates, install underlayment and cover with slip sheet.

Expansion Provisions: Provide for thermal expansion of exposed flashing and trim. Space movement joints at maximum of 10 feet (3 m) with no joints within 24 inches (600 mm) of corner or intersection.

Form expansion joints of intermeshing hooked flanges, not less than 1 inch (25 mm) deep, filled with sealant concealed within joints.

Use lapped expansion joints only where indicated on Drawings.

Fasteners: Use fastener sizes that penetrate wood blocking or sheathing not less than 1-1/4 inches for nails and not less than 3/4 inch for wood screws.

Conceal fasteners and expansion provisions where possible in exposed work and locate to minimize possibility of leakage. Cover and seal fasteners and anchors as required for a tight installation.

Soldered Joints: Clean surfaces to be soldered, removing oils and foreign matter. Pre-tin edges of sheets with solder to width of 1-1/2 inches; however, reduce pre-tinning where pre-tinned surface would show in completed Work.

Do not solder metallic-coated steel sheet.

Do not use torches for soldering.

Heat surfaces to receive solder, and flow solder into joint.