A5 - 549-23-723 SPECIFICATIONS Part 3.pdf

VETERANS AFFAIRS NORTH TEXAS

VA GRAND PRAIRIE UTILITY UPGRADE

VA Project No. 549-23-723 SITE CLEARING EA Project No. 02.0702 October 13, 2023

31 10 00 - 1

SECTION 31 10 00

SITE CLEARING

PART 1 - GENERAL

1.1 RELATED CONDITIONS

A. Provisions established within the 00 72 00 General Conditions and 00 73 00 Supplementary Conditions, Division 1 - General Requirements, and the Drawings are collectively applicable to this Section.

1.2 SUMMARY

A. This Section includes the following:

1. Protection of existing trees.

2. Removal of trees and other vegetation.

3. Topsoil stripping.

4. Clearing and grubbing.

5. Removing above-grade improvements.

6. Removing below-grade improvements.

1.3 PROJECT CONDITIONS.

A. Traffic: Conduct site clearing operations to ensure minimum interference with roads, streets, walks, and other adjacent occupied or used facilities. Do not close or obstruct streets, walks or other occupied or used facilities without permission from authorities having jurisdiction.

B. Protection of Existing Improvements: Provide protection necessary to prevent damage to existing improvements indicated to remain in place.

1. Protect improvements on adjoining properties and on Owner’s property.

2. Restore damaged improvements to their original condition, as acceptable to property owners.

C. Protection of Existing Trees and Vegetation: Protect existing trees and other vegetation indicated to remain in place, against unnecessary cutting, breaking or skinning of roots, skinning or bruising of bark, smothering of trees by stockpiling construction materials or excavated materials within drip line, excess foot or vehicular traffic, or parking of vehicles within drip line. Provide temporary guards to protect trees and vegetation to be left standing.

1. Water trees and other vegetation to remain within limits of contract work as required to maintain their health during course of construction operations.

2. Provide protection for roots over 1-1/2" diameter that are cut during construction operations. Coat cut faces with an emulsified asphalt, or other acceptable coating, formulated for use on damaged plant tissues. Temporarily cover exposed roots with wet burlap to prevent roots from drying out; cover with earth as soon as possible.

3. Repair or replace trees and vegetation indicated to remain which are damaged by construction operations, in a manner acceptable to Architect. Employ a licensed arborist to repair damages to trees and shrubs.

PART 2 – PRODUCTS (Not Used)

PART 3 - EXECUTION

VA Project No. 549-23-723 SITE CLEARING EA Project No. 02.0702 October 13, 2023

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3.1 SITE CLEARING

A. General: Remove trees, shrubs, grass and other vegetation, improvements, or obstructions as required to permit installation of new construction. Remove similar items elsewhere on site or premises as specifically indicated. “Removal” includes digging out and off-site disposing of stumps and roots.

1. Cut minor roots and branches of trees indicated to remain in a clean and careful manner, where such roots and branches obstruct installation of new construction.

B. Topsoil: Topsoil is defined as friable clay surface soil found in a depth of not less than 4”. Satisfactory topsoil is reasonably free of subsoil, clay lumps, stones, and other objects over 2" in diameter, and without weeds, roots, and other objectionable material.

1. Strip topsoil to whatever depths encountered in a manner to prevent intermingling with underlying subsoil or other objectionable material.

a. Remove heavy growths of grass from areas before stripping.

b. Where existing trees are indicated to remain, leave existing topsoil in place within drip lines to prevent damage to root system.

2. Stockpile topsoil in storage piles in areas indicated or directed. Construct storage piles to provide free drainage of surface water. Cover storage piles, if required, to prevent wind erosion.

3. Dispose of unsuitable or excess topsoil same as specified for disposal of waste material.

C. Clearing and Grubbing: Clear site of trees, shrubs and other vegetation, except for those indicated to be left standing.

1. Completely remove stumps, roots, and other debris protruding through ground surface.

2. Use only hand methods for grubbing inside drip line of trees indicated to remain.

3. Fill depressions caused by clearing and grubbing operations with satisfactory soil material, unless further excavation or earthwork is indicated.

4. Place fill material in horizontal layers not exceeding 6” loose depth, and thoroughly compact to a density equal to adjacent original ground.

D. Removal of Improvements: Remove existing above-grade and below-grade improvements as indicated and as necessary to facilitate new construction.

1. Abandonment or removal of certain underground pipe or conduits may be indicated.

3.2 DISPOSAL OF WASTE MATERIALS

A. Burning on Owner’s Property: Burning is not permitted on Owner’s property.

B. Removal from Owner’s Property; Remove waste materials and unsuitable or excess topsoil from Owner’s property.

END OF SECTION

VA Project No. 549-23-723 EARTH MOVING EA Project No. 02.0702 October 13, 2023

31 20 00 - 1

SECTION 31 20 00

EARTH MOVING

PART 1 – GENERAL

A. Provisions established within the 00 72 00 General Conditions and 00 73 00 Supplementary Conditions, Division 1 - General Requirements, and the Drawings are collectively applicable to this Section.

B. Obtain copies of the Geotechnical Report for this project and comply with specific recommendations for subgrade preparation and site drainage described therein.

1.2 GENERAL DESCRIPTION OF WORK INCLUDED

A. Coordinate work of this Section with work of other sections as required to properly execute work and as necessary to maintain satisfactory progress of work of other Sections.

B. Excavate materials to required subgrades or to effect moisture conditioning as noted on plan by civil engineer.

C. Removal of existing below grade improvements that occur within excavations.

D. Filling, backfilling, compaction, and rough grading of site to required subgrades.

E. Providing off-site suitable fill materials.

F. Dewatering, until permanent drainage system is operational.

G. Disposal of excess and unsuitable excavated materials.

H. Providing adequate dust control measures as necessary to maintain streets in clean condition from excavation site to disposal location.

I. Providing adequate protective measures for public, workmen, adjacent streets, buildings and utilities.

J. Lime stabilization for pavement and as a cap to moisture loss in conditioned soils, as specified in the Geotechnical Report, if required.

1.3 REFERENCES

A. American Society for Testing and Materials: (Latest Editions)

1. ASTM C 33, Concrete Aggregates.

2. ASTM D698, Moisture-Density Relations of Soils and Soil-

Aggregate Mixtures, Using 5.5-lb. (2.5 kg.) Rammer and 12-in.

(304.8-mm) Drop.

3. ASTM D 1556, Density of Soil in Place by the Sand- Cone Method.

4. ASTM D2167, Density of Soil in Place by the Rubber-Balloon

Method.

5. ASTM D 2922, Density of Soil and Soil-Aggregate in Place by

Nuclear Methods (Shallow Depth.)

6. ASTM D 3017, Moisture Control of Soil and Soil-Aggregate in Place by Nuclear Methods (Shallow Depth.)

1.4 REGULATORY REQUIREMENTS

A. Comply with rules, regulations, laws, and ordinances of authorities having jurisdiction.

B. Notify Department of Public Works - Field Operations, Director of Traffic Control, and Police Department. Make necessary arrangements and obtain their approval of routes used by hauling equipment. Obtain required permits for traffic control during hauling operations.

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1.5 QUALITY ASSURANCE

A. Testing Laboratory Services:

1. A soil testing and inspecting service is to be engaged for quality control testing during fill and backfill operations. The Contractor shall provide the Testing Laboratory with a copy of the Geotechnical Report prepared for this project to be used as a reference.

2. Submit soil materials proposed for backfill to laboratory for testing.

a. Laboratory will determine suitability of materials to be used.

b. Laboratory will submit test results and recommendations.

3. Advise testing laboratory two days in advance of operations.

4. Tests will be executed immediately prior to covering of compacted areas.

5. When tests indicate compaction does not meet requirements, remove fill and backfill completely, dry out or moisten as necessary and recompact.

a. Retest recompacted areas.

b. Repeat until tests indicate compliance with specified requirements.

c. Provide reworking and retesting at no additional compensation.

6. Permissible Tolerations: Finish excavations, fills, and grade within a tolerance of 0.05 foot above or 0.10 foot below required grades. Do not leave depressions in graded areas.

1.6 SUBMITTALS

A. Product Data: Submit manufacturer's descriptive literature and recommended installation instructions for filter fabric, and drainage matting.

B. Samples: Submit minimum, 10 lb., samples of each type of fill material to be used. Forward samples to testing laboratory, packed tightly in containers to prevent contamination.

C. Test Reports: If recent test results are available for proposed fill materials, submit to testing laboratory in lieu of samples. Test results are to clearly indicate types of materials and composition, hardness, compatibility and suitability for proposed usage.

D. Laboratory Test Reports for following:

1. Test reports on borrow material.

2. Field density reports.

3. One optimum moisture-maximum density curve for each type soil encountered.

4. Materials certificate stating materials acceptable for fill and backfill.

1.7 SUBSURFACE INVESTIGATION

A. Owner and Architect make no representation regarding character and extent of soil data or other surface or subsurface data and conditions which may be encountered during work and no guarantee as to accuracy or validity of interpretation of such data or conditions is made or intended.

1.8 PROTECTION

A. Provide, erect, and maintain all lights, barricades, warning signs, VA Project No. 549-23-723 EARTH MOVING EA Project No. 02.0702 October 13, 2023

31 20 00 - 3 and guards as necessary.

B. Provide adequate protective measures to protect existing adjacent construction, including buildings, streets, walks, utility lines, the public and workmen.

C. Protect all reference points, bench marks, and monuments from dislocation, damage, or being destroyed.

D. Survey adjacent structures and improvements, establishing exact relocations at fixed points to act as bench marks. Clearly identify bench marks and record existing elevations. Locate datum level used to establish bench mark elevations sufficiently distant so as to be not affected by movement resulting from excavation operations.

E. During excavation, resurvey bench marks, employing a Registered Professional Land Surveyor. Maintain accurate log of surveyed elevations for comparison with original elevations.

F. Exercise care during excavations as excessive withdrawal of ground water and lowering of ground water table may adversely affect stability and integrity of existing buildings and structures in vicinity or induce settlement in them through loss of ground (soil or earth), or settlement due to lowering of ground water under them.

G. Damage to buildings, structures, utilities, sidewalks, pavements, and other facilities in vicinity resulting from these operations will be Contractor's responsibility; provide whatever measures as necessary to prevent damages from occurring.

H. Keep adjacent streets and hauling routes free from soils and debris deposited thereon as results of this work. Clean debris as necessary.

I. Repair or replace work damaged or destroyed while performing work of this Section.

1.9 PROTECTION OF EXCAVATIONS

A. Protect excavations to prevent cave-ins or loose dirt from falling into excavations and to ensure against damage to existing streets, paving buildings, other structures, and utility lines when excavation and grading work occurs adjacent to or below same.

B. Protect bottom of excavations and soil around and beneath foundations from frost and water.

C. Grade around excavation to prevent surface water runoff into excavated area.

D. Provide dewatering system as necessary to keep excavations dry at all times until permanent pumping and discharge systems are fully operational.

PART 2 - PRODUCTS

2.1 MATERIALS

A. Below Grade Wall Backfill: Free draining sand or sandy gravel, with a maximum particle size of 2 inches and less than 5 percent passing the

no. 200 sieve.

B. Select fill: A sandy clay or clayey sand with a liquid limit less than 35 and a plasticity index between 5 and 15.

C. Onsite Fill: On-site material approved by the soils Engineer.

D. Imported Fill: Soil with a liquid limit less than 50 with no roots, vegetation on other undesirable matter, and no rocks large than 4 inches in diameter.

VA Project No. 549-23-723 EARTH MOVING EA Project No. 02.0702 October 13, 2023

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E. Filter Fabric: Permeable polypropylene or polyester construction, not less than 4.0 oz/sq.yd., 140N or 700X Drainage Fabric by Mirafi, Inc., Type T-140-N Stabilenka by American Enka Company, Typar Style 3401 by Dupont, or approved equivalent.

F. Drainage Matting:

1. High-impact polystyrene waffle-like core with filter fabric bonded on one side, and core perforated in areas of foundation weeps; Miradrain by Mirafi Inc., Charlotte, North Carolina, or Eljen Prefabricated Drainage Structures by Eljen Development Corporation, Storrs, Connecticut or approved equivalent

2. Compression-resistent open nylon matting with filter fabric bonded on one side, Type 9120 Enkadrain by American Enka Company, Enka, North Carolina.

G. Topsoil: Fertile, friable, natural loam surface soil free of subsoil, clay lumps, brush, weeds, roots, stones and other litter.

3.1 PREPARATION AND LAYOUT

A. Work shall be laid out by a Registered Professional Land Surveyor.

Establish extent of site grading by area and elevation; designate and identify datum elevation. Set required lines and levels.

B. Verify elevations, dimensions, and actual conditions at site. Refer discrepancies to Architect for interpretation or necessary modifications.

C. Maintain bench mark, monuments, and other reference points.

3.2 UTILITIES

A. Before starting site grading, establish location and extent of underground utilities occurring in work area.

B. Notify utility companies to remove and relocate lines which are in way of site grading.

C. Remove abandoned utility service lines from areas of site grading;

cap, plug or seal such lines and identify their location and grade.

D. On Project Record Documents accurately locate and record abandoned and active utility lines rerouted or extended.

3.3 PUMPING AND DRAINAGE

A. Provide adequate provisions for prompt removal of water accumulating in excavations, including temporary sumps, well points, pumps, drain lines, and other equipment or appurtenances as necessary.

B. Keep excavations free from water at all times and prevent water from interfering with progress or quality of work.

C. Drain site to temporary sumps and silt settling basins, and remove accumulated water by pumping to storm sewers. Excavate in sequence that will provide drainage to sumps at all times.

D. When pumping water from excavated areas, take special precautions to avoid undermining of contiguous property by withdrawal of sand, soil, or any other supporting materials from areas below surfaces of such property.

3.4 EXCAVATION

A. Excavate subsoil in accordance with lines and levels required for construction of site work. In areas where soil is to be moisture – conditioned remove existing soil to the top of the limestone or clayey

VA Project No. 549-23-723 EARTH MOVING EA Project No. 02.0702 October 13, 2023

31 20 00 - 5 sand layer.

B. Remove existing foundation, foundation mats, footings, catch basins, manholes, underground piping, abandoned utilities, and other below grade improvements that occur within excavated areas.

3.5 BACKFILLING

A. Ensure areas are free from debris, snow, ice and water, and that ground surfaces are not in frozen condition.

B. Backfill areas to grades, contours, levels, and elevations indicated.

C. Backfill systematically and as early as possible to allow maximum time for natural settlement and compaction.

D. Place fill materials in horizontal layers not exceeding 9" loose depth and uniformly compact. Use a method so as not to disturb or damage building drainage systems and waterproofing systems.

E. Maintain optimum moisture content of backfill materials to attain specified compaction density. Moisten materials as necessary.

F. Settlement or washing that occurs in backfilled areas prior to acceptance of work shall be repaired and grades re-established to required elevations and slopes.

3.6 RECONDITIONING SUBGRADE

A. Prior to beginning paving operations, any vegetation should be removed to a depth of at least 6”.

B. The exposed surface should then be scarified to a minimum depth of 6” and recompacted to a minimum of 95% of the maximum dry density as determined by ASTM D 698 (Standard Proctor Test) at a moisture content between the optimum moisture value and 4% above optimum, unless other wise specified in the Geotechnical Report.

C. In the event that additional fill is necessary to bring parking areas to grade, it should be placed in less than 8” loose lifts and compacted as indicated above.

D. The subgrade should be in a moist condition at the time concrete is deposited thereon.

E. Using coarse sand (sand cushion) as a leveling material is not allowed.

3.7 FULL DEPTH RECONDITIONING

A. Site clay soils shall be reconditioned to their full depth adjacent to the perimeter of the building where there is no basement or underground parking. This shall extend out from the building foundation a minimum of 5 feet (farther where shown on the drawings).

B. This reconditioning of site clay soils is in addition to that specified elsewhere under the building.

C. Remove the clay to expose limestone or clayey sand (typically 7 to 9 feet below existing grade).

D. The excavated clays shall be moisture conditioned, replaced in loose lifts not exceeding 9 inches and compacted.

E. Compaction shall be 92 to 96 percent of the materials maximum standard proctor dry density (ASTM D-698) at a workable moisture content of at least 3 percent above optimum.

3.8 GRADING

A. Establishment of grades: The Contractor shall be responsible for establishment of all grades by means of grade stakes placed at pavement corners at all abrupt changes of grade and elsewhere as

VA Project No. 549-23-723 EARTH MOVING EA Project No. 02.0702 October 13, 2023

31 20 00 - 6 required.

B. Grading: Grade to elevations required by drawings. Remove soft and unstable material which will not readily compact when rolled or tamped. Fill resulting depressions with stable material and roll until required compaction is obtained. At intermediate points for which finish grades are not indicated, finish grades shall be of uniform level or slope between points for which elevations are given.

Make certain that finish grades slope away from buildings in all directions to assure positive drainage as specified in the Geotechnical Report.

3.9 SURPLUS MATERIALS

A. Remove excavated and excess materials from site. Legally dispose of off construction site.

3.10 FIELD QUALITY CONTROL

A. Testing of compacted fill materials will be performed by testing laboratory. Refer to Division 1. Testing will be performed to least encumber performance of work.

B. Coordinate provisions for and sequence of testing with Testing Laboratory. Notify testing laboratory and allow sufficient time to perform density tests.

C. Testing Laboratory will establish moisture density relationships of soils in accordance with ASTM D 698, D 3017, or D 3017.

D. Testing Laboratory will perform in-place density test in accordance with ASTM D 1556, D 2167, D 2922, or other acceptable density tests.

E. If, during progress of work, tests indicate that compacted materials do not meet specified requirements, remove defective work, replace and retest.

F. Ensure compacted fills are tested before proceeding with placement of surface materials.

3.11 CLEANING

A. Clean debris caused by excavation and backfill work. Keep premises and adjacent streets clean and neat.

B. Leave stockpile areas completely free of excess fill materials.

VA Project No. 549-23-723 GRADING EA Project No. 02.0702 October 13, 2023

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SECTION 31 22 00

GRADING

1.1 RELATED REQUIREMENTS

A. Comply with Conditions of the Contract, Division 1 - General Requirements, and referenced documents.

B. Related Conditions: Provisions established within the 00 72 00 General Conditions and 00 73 00 Supplementary Conditions, Division 1 - General Requirements, and the Drawings are collectively applicable to this Section.

C. Obtain copies of the Geotechnical Report for this project and comply with specific recommendations for subgrade preparation and site drainage described therein.

1.2 GENERAL DESCRIPTION OF WORK INCLUDED

A. Coordinate work of this Section with work of other sections as required to properly execute work and as necessary to maintain satisfactory progress of work of other Sections.

B. Excavate materials to required subgrades as noted on plan by civil engineer.

C. Removal of existing below grade improvements that occur within excavations.

D. Filling, backfilling, compaction, and rough grading of site to required subgrades.

E. Providing off-site suitable fill materials.

F. Dewatering, until permanent drainage system is operational.

G. Disposal of excess and unsuitable excavated materials.

H. Providing adequate dust control measures as necessary to maintain streets in clean condition from excavation site to disposal location.

I. Providing adequate protective measures for public, workmen, adjacent streets, buildings and utilities.

J. Lime stabilization for pavement, as specified in the Geotechnical

Report, if required.

1.3 REFERENCES

A. American Society for Testing and Materials: (Latest Editions)

1. ASTM C 33, Concrete Aggregates.

2. ASTM D698, Moisture-Density Relations of Soils and Soil-

Aggregate Mixtures, Using 5.5-lb. (2.5 kg.) Rammer and 12-in.

(304.8-mm) Drop.

3. ASTM D 1556, Density of Soil in Place by the Sand- Cone Method.

4. ASTM D2167, Density of Soil in Place by the Rubber-Balloon

Method.

5. ASTM D 2922, Density of Soil and Soil-Aggregate in Place by

Nuclear Methods (Shallow Depth.)

6. ASTM D 3017, Moisture Control of Soil and Soil-Aggregate in Place by Nuclear Methods (Shallow Depth.)

1.4 REGULATORY REQUIREMENTS

A. Comply with rules, regulations, laws, and ordinances of authorities having jurisdiction.

B. Notify Department of Public Works - Field Operations, Director of Traffic Control, and Police Department. Make necessary arrangements

VA Project No. 549-23-723 GRADING EA Project No. 02.0702 October 13, 2023

31 22 00 - 1 and obtain their approval of routes used by hauling equipment. Obtain required permits for traffic control during hauling operations.

A. Testing Laboratory Services:

1. A soil testing and inspecting service is to be engaged for quality control testing during fill and backfill operations. The Contractor shall provide the Testing Laboratory with a copy of the Geotechnical Report prepared for this project to be used as a reference.

2. Submit soil materials proposed for backfill to laboratory for testing.

a. Laboratory will determine suitability of materials to be used.

b. Laboratory will submit test results and recommendations.

3. Advise testing laboratory two days in advance of operations.

4. Tests will be executed immediately prior to covering of compacted areas.

5. When tests indicate compaction does not meet requirements, remove fill and backfill completely, dry out or moisten as necessary and recompact.

a. Retest recompacted areas.

b. Repeat until tests indicate compliance with specified requirements.

c. Provide reworking and retesting at no additional compensation.

6. Permissible Tolerations: Finish excavations, fills, and grade within a tolerance of 0.05 foot above or 0.10 foot below required grades. Do not leave depressions in graded areas.

1.6 SUBMITTALS

A. Product Data: Submit manufacturer's descriptive literature and recommended installation instructions for filter fabric, and drainage matting.

B. Samples: Submit minimum, 10 lb., samples of each type of fill material to be used. Forward samples to testing laboratory, packed tightly in containers to prevent contamination.

C. Test Reports: If recent test results are available for proposed fill materials, submit to testing laboratory in lieu of samples. Test results are to clearly indicate types of materials and composition, hardness, compactibility and suitability for proposed usage.

D. Laboratory Test Reports for following:

1. Test reports on borrow material.

2. Field density reports.

3. One optimum moisture-maximum density curve for each type soil encountered.

4. Materials certificate stating materials acceptable for fill and backfill.

1.7 SUBSURFACE INVESTIGATION

A. Owner and Architect make no representation regarding character and extent of soil data or other surface or subsurface data and conditions which may be encountered during work and no guarantee as to accuracy or validity of interpretation of such data or conditions is made or intended.

VA Project No. 549-23-723 GRADING EA Project No. 02.0702 October 13, 2023

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1.8 PROTECTION

A. Provide, erect, and maintain all lights, barricades, warning signs, and guards as necessary.

B. Provide adequate protective measures to protect existing adjacent construction, including buildings, streets, walks, utility lines, the public and workmen.

C. Protect all reference points, bench marks, and monuments from dislocation, damage, or being destroyed.

D. Survey adjacent structures and improvements, establishing exact relocations at fixed points to act as bench marks. Clearly identify bench marks and record existing elevations. Locate datum level used to establish bench mark elevations sufficiently distant so as to be not affected by movement resulting from excavation operations.

E. During excavation, resurvey bench marks, employing a Registered Professional Land Surveyor. Maintain accurate log of surveyed elevations for comparison with original elevations.

F. Exercise care during excavations as excessive withdrawal of ground water and lowering of ground water table may adversely affect stability and integrity of existing buildings and structures in vicinity or induce settlement in them through loss of ground (soil or earth), or settlement due to lowering of ground water under them.

G. Damage to buildings, structures, utilities, sidewalks, pavements, and other facilities in vicinity resulting from these operations will be Contractor's responsibility; provide whatever measures as necessary to prevent damages from occurring.

H. Keep adjacent streets and hauling routes free from soils and debris deposited thereon as results of this work. Clean debris as necessary.

I. Repair or replace work damaged or destroyed while performing work of this Section.

1.9 PROTECTION OF EXCAVATIONS

A. Protect excavations to prevent cave-ins or loose dirt from falling into excavations and to ensure against damage to existing streets, paving buildings, other structures, and utility lines when excavation and grading work occurs adjacent to or below same.

B. Protect bottom of excavations and soil around and beneath foundations from frost and water.

C. Grade around excavation to prevent surface water runoff into excavated area.

D. Provide dewatering system as necessary to keep excavations dry at all times until permanent pumping and discharge systems are fully operational.

A. Controlled Backfill and Engineered Fill: Free-draining granular material with less than 3% passing a No. 200 sieve and less than 30% passing No. 40 sieve, non plastic. All granular backfill shall be approved by the testing laboratory.

B. Filter Fabric: Permeable polypropylene or polyester construction, not less than 4.0 oz/sq.yd., 140N or 700X Drainage Fabric by Mirafi, Inc., Type T-140-N Stabilenka by American Enka Company, Typar Style 3401 by Dupont, or approved equivalent.

C. Drainage Matting:

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1. High-impact polystyrene waffle-like core with filter fabric bonded on one side, and core perforated in areas of foundation weeps; Miradrain by Mirafi Inc., Charlotte, North Carolina, or Eljen Prefabricated Drainage Structures by Eljen Development Corporation, Storrs, Connecticut or approved equivalent

2. Compression-resistent open nylon matting with filter fabric bonded on one side, Type 9120 Enkadrain by American Enka Company, Enka, North Carolina.

D. Topsoil: Fertile, friable, natural loam surface soil free of subsoil, clay lumps, brush, weeds, roots, stones and other litter.

3.1 PREPARATION AND LAYOUT

A. Work shall be laid out by a Registered Professional Land Surveyor.

Establish extent of site grading by area and elevation; designate and identify datum elevation. Set required lines and levels.

B. Verify elevations, dimensions, and actual conditions at site. Refer discrepancies to Architect for interpretation or necessary modifications.

C. Maintain bench mark, monuments, and other reference points.

3.2 UTILITIES

A. Before starting site grading, establish location and extent of underground utilities occurring in work area.

B. Notify utility companies to remove and relocate lines which are in way of site grading.

C. Remove abandoned utility service lines from areas of site grading;

cap, plug or seal such lines and identify their location and grade.

D. On Project Record Documents accurately locate and record abandoned and active utility lines rerouted or extended.

3.3 PUMPING AND DRAINAGE

A. Provide adequate provisions for prompt removal of water accumulating in excavations, including temporary sumps, well points, pumps, drain lines, and other equipment or appurtenances as necessary.

B. Keep excavations free from water at all times and prevent water from interfering with progress or quality of work.

C. Drain site to temporary sumps and silt settling basins, and remove accumulated water by pumping to storm sewers. Excavate in sequence that will provide drainage to sumps at all times.

D. When pumping water from excavated areas, take special precautions to avoid undermining of contiguous property by withdrawal of sand, soil, or any other supporting materials from areas below surfaces of such property.

3.4 EXCAVATION

A. Excavate subsoil in accordance with lines and levels required for construction of site work.

B. Remove existing foundation, foundation mats, footings, catch basins, manholes, underground piping, abandoned utilities, and other below grade improvements that occur within excavated areas.

VA Project No. 549-23-723 GRADING EA Project No. 02.0702 October 13, 2023

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3.5 BACKFILLING

A. Ensure areas are free from debris, snow, ice and water, and that ground surfaces are not in frozen condition.

B. Backfill areas to grades, contours, levels, and elevations indicated.

C. Backfill systematically and as early as possible to allow maximum time for natural settlement and compaction.

D. Place fill materials in horizontal layers not exceeding 9" loose depth and uniformly compact. Use a method so as not to disturb or damage building drainage systems and waterproofing systems.

E. Maintain optimum moisture content of backfill materials to attain specified compaction density. Moisten materials as necessary.

F. Settlement or washing that occurs in backfilled areas prior to acceptance of work shall be repaired and grades re-established to required elevations and slopes.

3.6 RECONDITIONING SUBGRADE

A. Prior to beginning paving operations, any vegetation should be removed to a depth of at least 6”.

B. The exposed surface should then be scarified to a minimum depth of 6” and recompacted to a minimum of 95% of the maximum dry density as determined by ASTM D 698 (Standard Proctor Test) at a moisture content between the optimum moisture value and 4% above optimum, unless other wise specified in the Geotechnical Report.

C. In the event that additional fill is necessary to bring parking areas to grade, it should be placed in less than 8” loose lifts and compacted as indicated above.

D. The subgrade should be in a moist condition at the time concrete is deposited thereon.

E. Using coarse sand (sand cushion) as a leveling material is not allowed.

3.7 GRADING

A. Establishment of grades: The Contractor shall be responsible for establishment of all grades by means of grade stakes placed at pavement corners at all abrupt changes of grade and elsewhere as required.

B. Grading: Grade to elevations required by drawings. Remove soft and unstable material which will not readily compact when rolled or tamped. Fill resulting depressions with stable material and roll until required compaction is obtained. At intermediate points for which finish grades are not indicated, finish grades shall be of uniform level or slope between points for which elevations are given.

Make certain that finish grades slope away from buildings in all directions to assure positive drainage as specified in the Geotechnical Report.

3.8 SURPLUS MATERIALS

A. Remove excavated and excess materials from site. Legally dispose of off construction site.

3.9 FIELD QUALITY CONTROL

A. Testing of compacted fill materials will be performed by testing laboratory. Refer to Division 1. Testing will be performed to least encumber performance of work.

VA Project No. 549-23-723 GRADING EA Project No. 02.0702 October 13, 2023

31 22 00 - 1

B. Coordinate provisions for and sequence of testing with Testing Laboratory. Notify testing laboratory and allow sufficient time to perform density tests.

C. Testing Laboratory will establish moisture density relationships of soils in accordance with ASTM D 698, D 3017, or D 3017.

D. Testing Laboratory will perform in-place density test in accordance with ASTM D 1556, D 2167, D 2922, or other acceptable density tests.

E. If, during progress of work, tests indicate that compacted materials do not meet specified requirements, remove defective work, replace and retest.

F. Ensure compacted fills are tested before proceeding with placement of surface materials.

3.10 CLEANING

A. Clean debris caused by excavation and backfill work. Keep premises and adjacent streets clean and neat.

B. Leave stockpile areas completely free of excess fill materials.

VA Project No. 549-23-723 EROSION & SEDIMENTATION CONTROLS EA Project No. 02.0702 October 13, 2023

31 25 00 - 1

SECTION 31 25 00

EROSION & SEDIMENTATION CONTROLS

A. Provisions established within the 00 72 00 General Conditions and 00

1.2 DESCRIPTION OF WORK

A. This section will consist of the completion and implementation of a Storm Water Pollution Prevention Plan (SWPPP).

A. All materials shall be as specified or meeting the specifications as outlined in the North Central Texas Council of Governments Manual – “Storm Water Quality Best Management Practices for Construction Activities and the Standard Specifications for Public Works Construction.”

B. All procedures and materials used for erosion control shall be approved by the City.

3.1 GENERAL

A. It shall be the contractor’s responsibility to use whatever means are necessary to control and limit silt and sediment leaving this site.

Specifically, the contractor shall protect all public street, alleys, streams, storm drain systems and inlets from erosion deposits. The contractor shall comply with storm water pollution prevention management practices per the City and Texas Commissions on Environmental Quality.

B. Prior to commencing any construction, perimeter silt fence shall be installed at the locations shown on the plans and a stabilized construction entrance will be constructed per the Erosion Control and Storm Water Pollution Prevention Plans as applicable.

3.2 INSTALLATION

A. Grasses used to vegetate the site must be suitable for use under local climate and soil conditions. In general, hydro seeding or sodding bermuda grass is acceptable during the summer months (May 1 to August 30). Winter rye or fescue grass may be planted during times other than the summer months as a temporary measure until such time as the permanent planting can be made.

B. As inlets are completed, temporary sediment barriers and inlet protection shall be installed in accordance with the City Specifications.

C. At the completion of the paving and final grading, the disturbed area(s) shall be revegetated in accordance with the plans and specifications.

D. Silt fence and inlet sediment barriers shall remain in place until revegetation has been completed.

VA Project No. 549-23-723 EROSION & SEDIMENTATION CONTROLS EA Project No. 02.0702 October 13, 2023

31 25 00 - 1

E. Disturbed areas that are seeded or sodded shall be checked periodically to see that grass coverage is properly maintained.

Disturbed areas shall be watered, fertilized, and reseeded and resodded, if necessary.

F. If the erosion control is removed for construction and/or access purposes, the contractor shall replace it at the end of each work day.

G. Erosion protection may be added or deleted per the City.

H. If off-site soil borrow or spoil sites are used in conjunction with this project, this information shall be disclosed and shown on the Erosion Control Plan. Off-site borrow and spoil areas are considered a part of the project site and therefore shall comply with the City erosion control requirements. These areas shall be stabilized with permanent ground cover prior to final approval of the project.

I. Erosion control facilities and stabilization measures shall be provided and maintained by a qualified contractor or contractors experienced in providing said facilities and services.

J. Accumulated sediment shall be periodically removed from silt fences as required in order to maintain the effectiveness of the installation.

K. Silt fencing, when used, shall be installed in accordance with the manufacturers recommendations and in accordance with the details on these plans.

L. Upon completion of paving and drainage construction, final lot grading and general cleanup, all on-site street parkways (the area from the back of curb to the R.O.W. line) and adjacent street parkways disturbed by the construction shall be stabilized by Sod, Seeding or Hydromulching and shall conform to local City Standards and Specifications or Texas Department of Transportation Specifications.

Stabilized parkways subsequently disturbed by utility comply contractors shall be repaired by the utility company or its contractor.

M. Off-site utility construction shall be performed in a manner consistent with the requirements of this plan relative to preventing storm water pollution. Upon completion of trench backfilling and general cleanup, and soil areas disturbed by the construction shall be promptly stabilized.

N. Upon completion of all utility and paving construction and prior to finish grading, all soil contaminated by construction operations and construction waste material shall be removed from the site and disposed of at an appropriate authorized landfill or waste disposal facility.

O. If any contractor sees any violation of this plan by an operator or another contractor, he shall then notify the operator or contractor in violation as well as the facility operator.

P. A copy of the Notice of Intent (NOI) and a copy of the Storm Water Pollution Prevention Plan must be kept and maintained on the construction site.

Q. Stabilization measures are to be inspected at a minimum once every 14 days and within 24 hours after any rainfall greater than 0.5 inches.

Inspection reports shall be maintained by the contractor and made part of the plan.

R. The contractor shall adopt appropriate construction site management practices to prevent the discharge of oils, grease, paints, gasoline, VA Project No. 549-23-723 EROSION & SEDIMENTATION CONTROLS EA Project No. 02.0702 October 13, 2023

31 25 00 - 1 and other pollutants to the storm water system.

S. The Storm Water Pollution Prevention Plan (SWPPP) must be signed by the owner and contractor (as co-permittees) and retained on-site. The permittee shall post a notice near the main entrance of the construction site with the following information: 1) the NPDES permit number for the project or a copy of the NOI if a permit number has not been assigned; 2) the name and contact of the location contact person;

3) a brief description of the project; and 4) the location of SWPPP if the site is inactive or does not have an on-site location to store the plan.

T. The permittee is also responsible for amending or updating the SWPPP as construction activities progress and site conditions change.

U. Both the owner and contractor are responsible for reviewing the rules and requirements as outlined in the Texas Pollutant Discharge Elimination System General Permit No. TXR 150000 issued on February 19, 2013.

V. The permittee is also responsible for notifying the Texas Commission on Environmental Quality Director of the “person or specifically described position as an authorized person for signing reports, storm water pollution prevention plans, certificates, or other information requested by the Director or required by the permit” other than the NOI.Referenced tests, Material standards and specifications are the minimum requirements. The Contractor will meet the requirements and recommendations of the applicable portions of the standards listed.

Where compliance with two (2) or more industry standards or requirements are specified, and the overlapping of those different or conflicting minimums for levels of quality, the most stringent requirements is intended and will be enforced. The Contractor shall notify the Owner of any conflicts that are to be resolved.

1. City Standard Specifications and Details, Current Edition.

2. North Central Texas Council of Governments (COG) Standard

Specifications for Public Works Construction, Current Edition and Amendments.

3. Texas Highway Department Standard Specification for Construction of Highways, Streets and Bridges, Current Addition and Amendments.

4. American Associations of State Highway and Transportation Officials (AASHTO), Current Editions.

5. American Water Works Associations (AWWA), Current Editions.

6. American Society for Testing and Materials (ASTM), Current

Edition.

Any Reference to Methods of Measurement or Payment in Reference Standards or Specifications are not applicable.

VA Project No. 549-23-723 LIME STABILIZATION EA Project No. 02.0702 October 13, 2023

31 32 13.13 - 1

SECTION 31 32 13.13

LIME STABILIZATION

PART 1 – GENERAL

A. Provisions established within the 00 72 00 General Conditions and 00

1.2 DESCRIPTION

A. Work included:

1. Scope of work shall be as described in the contract drawings.

2. The top 6" of subgrade under drives and parking areas shall be stabilized to a distance of 1' - 0" beyond the edge of the paving.

B. Related work described elsewhere:

1. Earthwork and other fill preparation Section 31 22 00

2. Concrete Pavement Section 32 13 13

1.3 JOB CONDITIONS

A. Coordination: If separate contractors are involved with the lime stabilization and the general fill operations, the General Contractor shall be responsible for the proper coordination of the work to insure full compliance with all portions of the specifications, and shall be the single source of responsibility.

B. Existing Conditions: If conditions are other than shown on the drawings or contract documents, the Architect/Engineer shall be notified immediately.

C. Precautions: Extreme precautions shall be taken to prevent contamination of areas of the site where existing trees or other vegetation is to remain and where future planting is to be placed which is not sufficiently covered with additional topsoil material to prevent contamination. Similar precautions shall be taken to protect adjacent property and traffic.

PART 2 - MATERIALS

2.1 HYDRATED LIME

A. General: Hydrated lime shall be a dry powder obtained by treating quick-lime with enough water to satisfy its chemical affinity for water under the conditions of its hydration. This material should consist essentially of calcium hydroxide, magnesium oxide, and magnesium hydroxide, which are the active constituents of lime.

B. Lime Concentration: Two alternative requirements based on difference tests are permissible:

1. Total Oxides: For either high calcium or dolomitic hydrated lime, a minimum of 95% total oxide content (CaO + MgO) on a non-volatile basis is required.

If this test is elected, the hydrate must contain no more than 5% carbon dioxide content, if sampled at lime plat, or no more than 7%, if sampled at destination.

Determination of total oxide and carbon dioxide contents shall

VA Project No. 549-23-723 LIME STABILIZATION EA Project No. 02.0702 October 13, 2023

31 32 13.13 - 2 conform to ASTM Specification C25, “Chemical Analysis of Limestone, Quicklime, and Hydrated Lime.”

2. Available Lime: For high calcium hydrated lime a minimum available lime (Ca O) content of 90% is required, on a non-volatile basis (corresponding to a minimum of 68.1% on a volatile basis.

C. Particle Size: All hydrated lime shall conform to the following gradation requirement: At least 85% passing a #200 sieve.

Determination of particle size shall conform to the provision for wet sieving in ASTM C110 “Methods of Physical Testing for Quicklime and Hydrated Lime.”

2.2 WATER

A. Water shall be clean, potable, and free of impurities.

2.3 OTHER MATERIALS

A. All other materials not specifically described but required for proper completion of the work in this section, shall be as selected by the Contractor, subject to the approval of the Architect/Engineer.

3.1 GENERAL

A. The hydrated lime should be applied only in the area where the first mixing operations can be completed during the same work day. The hydrated lime can be placed by either the dry method or the slurry method. However, the dry method of placing hydrated lime has been prohibited by some municipalities since the lime is very easily blown by the wind. The Contractor is responsible for checking all local ordinances prior to commencement of work. The lime should not be applied when wind conditions are such that blowing lime becomes objectionable to traffic or adjacent property owners. A motor grader should not be used to spread the lime. The material should be sprinkled until the proper moisture content has been obtained.

If the situation is such that the hydrated lime cannot be placed by the dry method, then the slurry method will have to be used. The hydrated lime should be mixed with water in trucks or in tanks and applied as a thin water suspension or slurry. The distributor truck or tank should be equipped with an agitator which will keep the lime and water in a uniform mixture. The Contractor shall be responsible for calculating the number of square yards in each area and the amounts (pounds) per truck load, so that the rate of application can be checked very closely.

3.2 MIXING

A. The soil material and hydrated lime shall be thoroughly mixed by a rotary mixer or other device to obtain a homogeneous, friable mixture of soil material and lime, free from all clods or lumps, and left to cure from 1 to 4 days. Generally, a curing period of 48 to 72 hours is adequate. During the curing period, the material shall be kept moist.

3.3 FINAL MIXING

VA Project No. 549-23-723 LIME STABILIZATION EA Project No. 02.0702 October 13, 2023

31 32 13.13 - 3

A. After the required curing time, the material shall be uniformly mixed with a rotary mixer capable of reducing the size of the particles so that when all non-slaking aggregates (asphalt particles) retained on the No. 4 sieve are moved, the remainder of the material shall meet the following requirements when tested dry by laboratory sieves:

minimum passing 1 3/4" sieve - 100% minimum passing No. 4 sieve - 60%

During the interval of time between application and mixing, the hydrated lime should not be exposed to the open air for a period of over 6 hours.

3.4 COMPACTION

A. Compaction of the mixture shall begin immediately after final mixing, and in no case later than 3 calendar days after final mixing. The material should be aerated or sprinkled as necessary to provide the optimum moisture. Compaction shall begin at the bottom and continue until the entire depth of mixture is uniformly compacted. All irregularities, depressions, or weak spots which develop must be corrected immediately by scarifying the areas affected, adding or removing material, and reshaping and recompacting by sprinkling and rolling. The surface should be maintained in a smooth condition -free from undulations and ruts.

The subgrade shall be compacted to between 95% and 100% of the maximum dry density as defined by ASTM D-698 (Standard Proctor Test), at a moisture content between optimum and 4 percentage points above the optimum moisture value. After the required compaction is reached, the subgrade should be brought to the required lines and grades and finished by rolling with a pneumatic tire or other suitable roller sufficiently light to prevent hairline cracking.

The compacted section shall be moist-cured for a minimum of 3 days.

To prevent damage from traffic, the completed section shall not be opened to traffic for 2 days after compaction.

3.5 TESTING

A. Testing shall be conducted as described in Section 31 22 00-3.09 of these specifications.

VA Project No. 549-23-723 DRILLED PIERS

31 63 29 - 1

SECTION 316329

DRILLED PIERS

1.1 DESCRIPTION

A. Perform all work required to complete the Drilled Pier Work indicated by the Contract Documents and furnish all supplementary items necessary for its proper installation.

B. Related Work Specified Elsewhere:

1. Geotechnical Report referred to on the structural drawings.

2. Testing and Inspection Services – Division 1

3. Unit Price Schedule – Division 1

4. Concrete Formwork – Section 031000

5. Concrete Reinforcement - Section 032000

6. Cast-in-Place Concrete - Section 033000

C. Contractor shall study the Geotechnical Investigation Report and the recommendations given therein for the procedures to be followed as they pertain to the work of this Section.

1.2 INSPECTION

A. Before the steel reinforcing cage and concrete is placed, every drilled…