Amendment_2.pdf

East Campus Demolition and Roadway VAMC Jefferson Barracks Division, St. Louis, Missouri VA Solicitation No.: 36C10F18R0688 VA Project No.: 657-313J

AMENDMENT NO. 0002 January 14, 2019

The following summarizes revisions or clarifications to VA Solicitation No. 36C10F18R0688 issued December 13, 2018. Drawings or Specifications referenced and included herein shall replace and supersede only the corresponding documents previously issued. All other documents not changed, replaced, or retracted by this or any subsequent amendment, remain a part of the solicitation. Offerors’ proposals shall acknowledge Offerors’ receipt and inclusion of this Amendment No. 0002.

DRAWING REVISIONS INCLUDE THE FOLLOWING:

East Campus Demolition and Roadway Volume 1

Sheet C110 ADDED pavement hatching for accessible parking spaces.

SPECIFICATION REVISIONS INCLUDE THE FOLLOWING:

Specifications Volume 2

31 20 00 Earth Moving REVISED Section 3.6

32 12 16 Asphalt Paving REVISED Section 2.4

REQUESTS FOR INFORMATION AND RESPONSES:

Q3. Specification Section 32 12 16: Specification’s note prime & tack coats, but drawing detail does not show. Is prime & tack coat required?

A3. Prime and tack coats are required.

Q4. Specification Section 32 12 16: Specification’s note sealer, sealers need 4-6 week cure on asphalt before placement, specs call for 1 year cure, is sealer required?

A4. Sealer is only required for pavement repair areas that may be required adjacent to new work.

The new pavement will not require a sealer.

Q5. Specification Section 32 12 16: Specification’s note Registered Professional Land Surveyor required for alignment and grade control. Is it required?

A5. Yes. Refer to Specification Section 01 00 00, GENERAL REQUIREMENTS (paragraphs 1.11 and 1.12), included in the VA solicitation documents, for additional information.

Q6. Specification Section 32 17 23: Specification’s call for 14 day cure on asphalt before placement of pavement markings, is this going to be required?

A6. Yes

Q7. Specification Section 32 17 23: Specifications call for pavement markings on curbs. Are there any curbs to have markings?

A7. No.

Q8. Drawing C-110 Site Geometric & Layout Plan: Sheet does not show pavement type at handicap spots at the North East side of Building 52?

A8. These spaces will require light duty vehicular asphalt pavement, similar to all other parking spaces.

Q9. 31 20 00 Paragraph 3.6 Point A, Page 15: Section mentions “a Designated storage area on medical center property will be provided for surplus satisfactory soil.” Does this imply that the medical center is providing a dump site for satisfactory surplus soils at the end of the project or will all surplus materials need to be removed from the site?

A9. The medical center will not be providing a dump site for satisfactory surplus soils at the end of the project. All surplus materials shall be removed from the site and legally disposed of by the successful Offerer once final grades have been achieved.

Q10. 01 33 23, Paragraph 1-9, Page 3: Is there a cost associated with obtaining/using the Tririga Project Management System?

A10. No

Q11. Plan Sheet GC100: Does ALL work described in sequence 4 on plan sheet GC100 need to be completed 6pm to 6am and on weekends or is this just for the corridor enclosure work?

A11. With respect to sequence 4, this requirement applies only to the corridor enclosure work.

Q12. 01 35 26, Paragraph C, Page 32: Will the Missouri One Call system locate any utilities on the VA property?

A12. In accordance with the solicitation documents, it is the successful Offeror’s responsibility, prior to preforming any ground disturbance work, to locate, and document the location of, all existing utilities within the project boundary using ground penetrating radar. (Refer to Specification Section 01 00 00, GENERAL REQUIREMENTS included in the VA solicitation documents.)

Q13. Plan Sheet C103: Plan sheet notes “Site grading shall include full depth fill remediation and high plastic clay remediation pavement areas per the geo report”. The geo report vaguely mentions that 1’ of remediation “may” be necessary but does not describe what needs to take place (IE lime stabilization, percent of lime, etc.). Please define and clarify what fill and high plastic clay remediation needs to take place if any?

A13. The result of the geotechnical investigation concluded that the existing soil conditions are such that remediation is not required to achieve a stabilized condition for the pavement area. It is the contractor’s responsibility to implement means and methods whereby the existing soil conditions are protected and maintained for performance of the work. Should the contractor schedule or perform subgrade preparation during likely periods when adverse impact can occur as a result of wet weather conditions, it shall be the contractor’s responsibility to mitigate any unacceptable conditions that result at no additional cost to the Government.

Q14. Plan Sheet C103: If any soil remediation needs to take place, will it only be required under asphalt and concrete drive pavement areas?

A14. See response to Q13.

Q15. Plan Sheets C101 and C102: Plans sheets show TBR on the majority of the utilities. Can any of these utilities be marked TBR be grout filled in Lieu of removal?

A15. No.

Q16. Plan Sheet C129: The plantings listed on this plan sheet are for what basin?

A16. This is bio-retention area #19, as noted on the plans.

Q17. Will temporary walkways be required and if so where? Could a map or drawing be provided showing the path for temp walkways if required?

A17. Offeror’s should include in their CLIN 1 price temporary walks to accommodate the occupants of the Engineering/Warehouse (Building 57). The location and routing of such walks is dependent on the performance of the work within the project boundary and their location and routing should be such to afford the occupants safe passage and access from and to the building. Offeror’s should anticipate, in their pricing, the need to relocate or reroute such temporary walks as performance of the work progresses. The location and routing of temporary walks will be subject to the approval of the Resident Engineer.

Q18. 01 74 19 Paragraph 1.3, Section C, Page 2: It was mentioned at the pre-bid meeting that any LEED requirements for the demolition or new work on this project will not be necessary. Please verify.

A18. It is not intended that the project will be submitted for LEED certification. It is intended that LEED requirements be followed on the basis that such requirements establish best practice for performance of the work.

Q19. 31 20 00 Page 5: This specification section makes mention of rock excavation. This bid form provides unit pricing for rock excavation. Should the contractor assume in the base bid that NO rock excavation will take place and if any rock is encountered it will be paid for by the unit pricing?

A19. No. Offeror’s shall determine from the solicitation documents that quantity of rock removal required for performance of the work and include cost for such rock removal in their CLIN 1price. The intent of the unit pricing is to establish, for contract award purposes, a cost basis for change order adjustments to the accepted contract price for additional unforeseen rock removal that could not have been anticipated from the information in the solicitation documents.

Q20. 31 20 00, Page4: This specification mentions that earthwork will be paid for by the unit (CY).

Please clarify if earthwork will be part of the lump sum bid or if unit pricing needs to be provided.

A20. Offeror’s shall determine from the solicitation documents the quantity of earthwork required for the performance of the work and include cost for such earthwork in their CLIN 1 price. The intent of the unit pricing is to establish, for contract award purposes, a cost basis for change order adjustments to the accepted contract price for additional unforeseen rock removal that could not have been anticipated from the information in the solicitation documents.

- - - END - - -

36C10F18R0688 East Campus Demolition & Roadwork VAMC St. Louis, MO-JB Division VA Project 657-313J

31 20 00-1

SECTION 31 20 00

EARTH MOVING

PART 1 - GENERAL

1.1 DESCRIPTION OF WORK

A. This section specifies the requirements for furn ishing all equipment, materials, labor, tools, and techniques for earthwo rk including, but not limited to, the following:

1. Site preparation.

2. Excavation.

3. Underpinning.

4. Filling and backfilling.

5. Grading.

6. Soil Disposal.

7. Clean Up.

1.2 DEFINITIONS:

A. Unsuitable Materials:

1. Fills: Topsoil; frozen materials; construction m aterials and materials subject to decomposition; clods of clay a nd stones larger than 75 mm (3 inches); organic material, including silts, which are unstable; and inorganic materials, including silts, too wet to be stable and any material with a liquid limit and pla sticity index exceeding 45 and 15 respectively. Unsatisfactory s oils also include satisfactory soils not maintained within 3 percent of optimum moisture content at time of compaction, as defined by ASTM D 1557.

2. Existing Subgrade (Except Footing Subgrade): Sam e materials as

1.2.A.1, that are not capable of direct support of slabs, pavement, and similar items with possible exception of improv ement by compaction, proofrolling, or similar methods.

3. Existing Subgrade (Footings Only): Same as parag raph 1, but no fill or backfill. If materials differ from reference bor ings and design requirements, excavate to acceptable strata subject to Resident

Engineer's approval.

B. Building Earthwork: Earthwork operations require d in area enclosed by a line located 1500 mm (5 feet) outside of principal building perimeter.

It also includes earthwork required for auxiliary s tructures and buildings.

C. Trench Earthwork: Trenchwork required for utilit y lines.

31 20 00-2

D. Site Earthwork: Earthwork operations required in area outside of a line located 1500 mm (5 feet) outside of principal build ing perimeter and within new construction area with exceptions noted above.

E. Degree of compaction: Degree of compaction is ex pressed as a percentage of maximum density obtained by laboratory test proc edure. This percentage of maximum density is obtained through u se of data provided from results of field test procedures presented in ASTM D1556, ASTM

D2167, and ASTM D2922.

F. Fill: Satisfactory soil materials used to raise existing grades. In the

Construction Documents, the term “fill” means fill or backfill as appropriate.

G. Backfill: Soil materials or controlled low stren gth material used to fill an excavation.

H. Unauthorized excavation: Removal of materials be yond indicated sub-grade elevations or indicated lines and dimensions withou t written authorization by the Resident Engineer. No payment will be made for unauthorized excavation or remedial work required t o correct unauthorized excavation.

I. Authorized additional excavation: Removal of add itional material authorized by the Resident Engineer based on the de termination by the

Contractor retained testing laboratory that unsuita ble bearing materials are encountered at required sub-grade elevations. R emoval of unsuitable material and its replacement as directed will be pa id on basis of

Conditions of the Contract relative to changes in w ork.

J. Subgrade: The undisturbed earth or the compacted soil layer immediately below granular sub-base, drainage fill, or topsoil materials.

K. Structure: Buildings, foundations, slabs, tanks, curbs, mechanical and electrical appurtenances, or other man-made station ary features constructed above or below the ground surface.

L. Borrow: Satisfactory soil imported from off-site for use as fill or backfill.

M. Drainage course: Layer supporting slab-on-grade used to minimize capillary flow of pore water.

N. Bedding course: Layer placed over the excavated sub-grade in a trench before laying pipe. Bedding course shall extend up to the springline of the pipe.

O. Sub-base Course: Layer placed between the sub-gr ade and base course for asphalt paving or layer placed between the sub-grad e and a concrete pavement or walk.

31 20 00-3

P. Utilities include on-site underground pipes, con duits, ducts, and cables as well as underground services within buildings.

Q. Debris: Debris includes all materials located wi thin the designated work area not covered in the other definitions and shall include but not be limited to items like vehicles, equipment, applianc es, building materials or remains thereof, tires, any solid or l iquid chemicals or products stored or found in containers or spilled o n the ground.

R. Contaminated soils: Soil that contains contamin ates as defined and determined by the Resident Engineer or the Governme nt’s testing agency.

1.3 RELATED WORK

A. Materials testing and inspection during construc tion: Section 01 45 29, TESTING LABORATORY SERVICES.

B. Safety requirements: Section 00 72 00, GENERAL C ONDITIONS, Article, ACCIDENT PREVENTION.

C. Protection of existing utilities, fire protectio n services, existing equipment, roads, and pavements: Section 01 00 00, GENERAL REQUIREMENTS.

D. Subsurface Investigation: Section 01 00 00, GENE RAL REQUIREMENTS, Article, PHYSICAL DATA.

E. Erosion Control: Section 01 57 19, TEMPORARY ENV IRONMENTAL CONTROLS, and

Section 32 90 00, PLANTING.

F. Site preparation: Section 31 23 19, DEWATERING, and Section 02 41 00, DEMOLITION.

G. Foundation system requirements: Section 31 23 23 .33, FLOWABLE FILL.

H. Paving sub-grade requirements: Section 32 12 16, ASPHALT PAVING, and

Section 32 05 23 CEMENT AND CONCRETE FOR EXTERIOR I MPROVEMENTS.

1.4 CLASSIFICATION OF EXCAVATION:

A. Unclassified Excavation: Removal and disposal of pavements and other man-made obstructions visible on surface; utilities , and other items including underground structures indicated to be de molished and removed;

together with any type of materials regardless of c haracter of material and obstructions encountered.

B. Classified Excavation: Removal and disposal of a ll material except that material not defined as Rock.

C. Rock Excavation:

1. Trenches and Pits: Removal and disposal of solid , homogenous, interlocking crystalline material with firmly cemen ted, laminated, or foliated masses or conglomerate deposits that canno t be excavated with a late-model, track-mounted hydraulic excavato r; equipped with a

1050 mm (42 inch) wide, short-tip-radius rock bucke t; rated at not less than 103 kW (138 hp) flywheel power with bucke t-curling force of

31 20 00-4 not less than 125 kN (28,090 lbf) and stick-crowd f orce of not less than 84.5 kN (19,000 lbf); measured according to SA E J-1179. Trenches in excess of 3000 mm (10 feet) wide and pits in exc ess of 9000 mm (30 feet) in either length or width are classified as o pen excavation.

2. Open Excavation: Removal and disposal of solid, homogenous, interlocking crystalline material firmly cemented, laminated, or foliated masses or conglomerate deposits that canno t be dislodged and excavated with a late-model, track-mounted loader; rated at not less than 157 kW (210 hp) flywheel power and developing a minimum of 216 kN (48,510 lbf) breakout force; measured according to SAE J-732.

3. Other types of materials classified as rock are unstratified masses, conglomerated deposits and boulders of rock materia l exceeding 0.76 m3 (1 cubic yard) for open excavation, or 0.57 m3 ( 3/4 cubic yard) for footing and trench excavation that cannot be re moved by rock excavating equipment equivalent to the above in siz e and performance ratings, without systematic drilling, ram hammering , or ripping.

4. Definitions of rock and guidelines for equipment are presented for general information purposes only. The Contractor is expected to use the information presented in the Geotechnical Engin eering Report to evaluate the extent and competency of the rock and to determine both quantity estimations and removal equipment and effo rts.

1.5 MEASUREMENT AND PAYMENT FOR EXCAVATION:

A. Measurement: The unit of measurement for excavat ion and borrow will be the cubic yard, computed by the average end area method from cross sections taken before and after the excavation and borrow operations, including excavations for ditches, gutters, and cha nnel changes, when the material is acceptably utilized or disposed of as herein specified. Quantities should be computed by a Regi stered Profession

Surveyor or Registered Civil Engineer, specified in Section 01 00 00, GENERAL REQUIREMENTS. The measurement will include authorized excavation for rock, authorized excavation of satis factory subgrade soil, and the volume of loose, scattered rocks and boulders collected within the limits of the work; allowance will be ma de on the same basis for selected backfill ordered as replacement. The measurement will not include the volume of subgrade material or other material used for purposed other than directed. The volumes of overburden stripped from borrow pits and the volumes of excava tion for ditches to drain borrow pits, unless used as borrow materia l, will not be measured for payment. The measurement will not inc lude the volume of

31 20 00-5 any excavation performed prior to taking of elevati ons and measurements of the undisturbed grade.

1.6 MEASUREMENT AND PAYMENT FOR ROCK EXCAVATION:

A. Measurement: Cross section and measure uncovered and separated materials, and compute quantities by Registered Pro fessional Land

Surveyor or Registered Civil Engineer, specified in Section 01 00 00, GENERAL REQUIREMENTS. Do not measure quantities bey ond the following limits:

1. 600 mm (24 inches) from outside face of concrete work for which forms are required, except for footings.

2. 300 mm (12 inches) from outside of perimeter of formed footings.

3. 150 mm (6 inches) below bottom of pipe and not m ore than pipe diameter plus 600 mm (24 inches) in width for pipe trenches.

4. From outside dimensions of concrete work for whi ch no forms are required (trenches, conduits, and similar items not requiring forms).

B. Payment: Separate payment shall be made for ro ck excavation quantities.

The amount of base bid rock trench excavation is es timated to be 300 cubic yards. Contract price and time will be adjust ed for overruns or underruns in accordance with Articles, DIFFERING SI TE CONDITIONS, CHANGES and CHANGES-SUPPLEMENT of the GENERAL CONDITIONS as applicable.

1.7 SUBMITTALS:

A. Submit in accordance with Section 01 33 23, SHOP DRAWINGS, PRODUCT DATA, AND SAMPLES.

B. Weekly Excavation Report:

1. Certification of excavation and/or borrow quanti ties excavated.

2. Excavation method.

3. Labor.

4. Equipment.

5. Land Surveyor's or Civil Engineer's name and off icial registration stamp.

6. Plot plan showing elevation.

C. Weekly Rock Excavation Report:

1. Certification of rock quantities excavated.

2. Excavation method.

3. Labor.

4. Equipment.

5. Land Surveyor's or Civil Engineer's name and off icial registration stamp.

6. Plot plan showing elevation.

D. Furnish to Resident Engineer:

31 20 00-6

1. Soil classification and test reports.

a. Classification in accordance with ASTM D2487 for each on-site or borrow soil material proposed for fill, backfill, e ngineered fill, or structural fill.

b. Laboratory compaction curve in accordance with A STM D698 for each on site or borrow soil material proposed for fill, backfill, engineered fill, or structural fill.

c. Test reports for compliance with ASTM D2940 requ irements for subbase material.

d. Pre-excavation photographs and videotape in the vicinity of the existing structures to document existing site featu res, including surfaces finishes, cracks, or other structural blem ishes that might be misconstrued as damage caused by earthwork operations.

e. The Contractor shall submit a scale plan daily t hat defines the location, limits, and depths of the area excavated.

2. Contractor shall submit procedure and location f or disposal of unused satisfactory material. Proposed source of borrow ma terial.

Notification of encountering rock in the project. Advance notice on the opening of excavation or borrow areas. Advance notice on shoulder construction for rigid pavements.

1.8 APPLICABLE PUBLICATIONS

A. Publications listed below form a part of this sp ecification to extent referenced. Publications are referenced in text by basic designation only. The publications are referred to in the text by the basic designation only and shall be the most current editions unless otherwise determined by the Resident Engineer.

B. American Association of State Highway and Transp ortation Officials

(AASHTO):

T99.....................Moisture-Density Relations of Soils Using a 2.5 kg (5.5 lb) Rammer and a 305 mm (12 inch) Drop

T180....................Moisture-Density Relations of Soils using a 4.54 kg (10 lb) Rammer and a 457 mm (18 inch) Drop

C. American Society for Testing and Materials (ASTM ):

D448....................Standard Classification for Sizes of Aggregate for Road and Bridge Construction

D698....................Standard Test Methods for L aboratory Compaction

Characteristics of Soil Using Standard Effort

(12,400 ft. lbf/ft 3 (600 kN m/m 3))

D1556...................Standard Test Method for De nsity and Unit Weight of Soil in Place by the Sand-Cone Method

31 20 00-7

D1557...................Standard Test Methods for L aboratory Compaction

Characteristics of Soil Using Modified Effort

(56,000 ft-lbf/ft 3 (2700 kN m/m 3))

D2167...................Standard Test Method for De nsity and Unit Weight of Soil in Place by the Rubber Balloon Method

D2487...................Standard Classification of Soil for Engineering

Purposes (Unified Soil Classification System)

D2922...................Standard Test Methods for D ensity of Soil and

Soil-Aggregate in Place by Nuclear Methods

(Shallow Depth)

D2940...................Standard Specifications for Graded Aggregate

Material for Bases or Subbases for Highways or

Airports

D. Society of Automotive Engineers (SAE):

J732....................Specification Definitions - Loaders

J1179...................Hydraulic Excavator and Bac khoe Digging Forces

PART 2 - PRODUCTS

2.1 MATERIALS

A. General: Provide borrow soil material when suff icient satisfactory soil materials are not available from excavations.

B. Fills: Material in compliance with ASTM D2487 So il Classification Groups

GW, GP, GM, SW, SP, SM, SC, and ML, or any combinat ion of these groups;

free of rock or gravel larger than 75 mm (3 inches) in any dimension, debris, waste, frozen materials, vegetation, and ot her deleterious matter. Material approved from on site or off site sources having a minimum dry density of 1760 kg/m3 (110 pcf), a maxi mum Plasticity Index of 15, and a maximum Liquid Limit of 45.

C. Engineered Fill: Naturally or artificially grade d mixture of compliance with ASTM D2487 Soil Classification Groups GW, GP, GM, SW, SP, SM, SC, and ML, or any combination of these groups, or as a pproved by the

Engineer or material with at least 90 percent passi ng a 37.5-mm (1 1/2-inch) sieve and not more than 12 percent passing a 75-µm (No. 200) sieve, per ASTM D2940;.

D. Bedding: Naturally or artificially graded mixtur e of natural or crushed gravel, crushed stone, and natural or crushed sand; ASTM D2940; except with 100 percent passing a 25 mm (1 inch) sieve and not more than 8 percent passing a 75- µm (No. 200) sieve.

1. Bedding for sanitary and storm sewer pipe shall conform to the

Metropolitan St. Louis Sewer District Standard Cons truction

Specifications for Sewers and Drainage Facilities.

31 20 00-8

2. Bedding for water lines shall meet the requireme nts of MSD-1 material designation.

E. Drainage Fill: Washed, narrowly graded mixture o f crushed stone, or crushed or uncrushed gravel; ASTM D448; coarse-aggr egate grading Size

57; with 100 percent passing a 37.5 mm (1 1/2-inch) sieve and 0 to 5 percent passing a 2.36 mm (No. 8) sieve.

F. Granular Fill:

1. Under concrete slab, crushed stone or gravel gra ded from 25 mm (1 inch) to 4.75 mm (No. 4), per ASTM D 2940.

PART 3 - EXECUTION

3.1 SITE PREPARATION

A. Clearing: Clear within limits of earthwork opera tions as shown. Work includes removal of trees, shrubs, fences, foundati ons, incidental structures, paving, debris, trash, and other obstru ctions. Remove materials from Medical Center Property.

B. Grubbing: Remove stumps and roots 75 mm (3 inch) and larger diameter.

Undisturbed sound stumps, roots up to 75 mm (3 inch ) diameter, and nonperishable solid objects a minimum of 900 mm (3 feet) below subgrade or finished embankment may be left.

C. Trees and Shrubs: Trees and shrubs, not shown fo r removal, may be removed from areas within 4500 mm (15 feet) of new construction and 2250 mm (7.5 feet) of utility lines when removal is appr oved in advance by

Resident Engineer. Remove materials from Medical Ce nter Property. Box, and otherwise protect from damage, existing trees a nd shrubs which are not shown to be removed in construction area. Immed iately repair damage to existing trees and shrubs by trimming, cleaning and painting damaged areas, including roots, in accordance with standard industry horticultural practice for the geographic area and plant species. Do not store building materials closer to trees and shrubs , that are to remain, than farthest extension of their limbs.

D. Stripping Topsoil: Strip topsoil from within lim its of earthwork operations as specified. Topsoil shall be a fertile , friable, natural topsoil of loamy character and characteristic of lo cality. Topsoil shall be capable of growing healthy horticultural crops o f grasses. Stockpile topsoil and protect as directed by Resident Enginee r. Eliminate foreign materials, such as weeds, roots, stones, subsoil, f rozen clods, and similar foreign materials larger than 0.014 m3 (1/2 cubic foot) in volume, from soil as it is stockpiled. Retain topso il on site. Remove foreign materials larger than 50 mm (2 inches) in a ny dimension from topsoil used in final grading. Topsoil work, such a s stripping, 31 20 00-9 stockpiling, and similar topsoil work shall not, un der any circumstances, be carried out when soil is wet so t hat the composition of the soil will be destroyed.

E. Concrete Slabs and Paving: Score deeply or saw c ut to insure a neat, straight cut, sections of existing concrete slabs a nd paving to be removed where excavation or trenching occurs. Exten d pavement section to be removed a minimum of 300 mm (12 inches) on each side of widest part of trench excavation and insure final score lines a re approximately parallel unless otherwise indicated. Remove materia l from Medical Center

Property.

F. Lines and Grades: Registered Professional Land S urveyor or Registered

Civil Engineer, specified in Section 01 00 00, GENE RAL REQUIREMENTS, shall establish lines and grades.

1. Grades shall conform to elevations indicated on plans within the tolerances herein specified. Generally grades shall be established to provide a smooth surface, free from irregular surfa ce changes.

Grading shall comply with compaction requirements a nd grade cross sections, lines, and elevations indicated. Where sp ot grades are indicated the grade shall be established based on i nterpolation of the elevations between the spot grades while mainta ining appropriate transition at structures and paving and uninterrupt ed drainage flow into inlets.

2. Locations of existing elevations indicated on pl ans are approximate.

Proposed spot elevations and contour lines have bee n developed utilizing the existing conditions survey and develo ped contour lines and may be approximate. Contractor is responsible t o notify Resident

Engineer of any differences between existing elevat ions shown on plans and those encountered on site by Surveyor/Eng ineer described above. Notify Resident Engineer of any differences between existing or constructed grades, as compared to those shown o n the plans.

3. Subsequent to establishment of lines and grades, Contractor will be responsible for any additional cut and/or fill requ ired to ensure that site is graded to conform to elevations indica ted on plans.

4. Finish grading is specified in Section 32 90 00, PLANTING.

G. Disposal: All materials removed from the propert y shall be disposed of at a legally approved site, for the specific materi als, and all removals shall be in accordance with all applicable Federal, State and local regulations. No burning of materials is permitted o nsite.

31 20 00-10

3.2 EXCAVATION

A. Shoring, Sheeting and Bracing: Shore, brace, or slope, its angle of repose or to an angle considered acceptable by the Resident Engineer, banks of excavations to protect workmen, banks, adj acent paving, structures, and utilities.

1. Design of the temporary support of excavation sy stem is the responsibility of the Contractor.

2. Construction of the support of excavation system shall not interfere with the permanent structure and may begin only aft er a review by the

Resident Engineer.

3. Extend shoring and bracing to a minimum of 1500 mm (5 feet) below the bottom of excavation. Shore excavations that are ca rried below elevations of adjacent existing foundations.

4. If bearing material of any foundation is disturb ed by excavating, improper shoring or removal of existing or temporar y shoring, placing of backfill, and similar operations, the Contractor shall underpin the existing foundation, per Section 3.3 under dist urbed foundations, as directed by Resident Engineer, at no additional cost to the

Government. Do not remove shoring until permanent w ork in excavation has been inspected and approved by Resident Enginee r.

B. Excavation Drainage: Operate pumping equipment, and /or provide other materials, means and equipment as required to keep excavation free of water and subgrade dry, firm, and undisturbed until approval of permanent work has been received from Resident Engi neer. Approval by the

Resident Engineer is also required before placement of the permanent work on all subgrades.

C. Subgrade Protection: Protect subgrades from soft ening, undermining, washout, or damage by rain or water accumulation. Reroute surface water runoff from excavated areas and not allow water to accumulate in excavations. Do not use excavated trenches as temp orary drainage ditches. When subgrade for foundations has been di sturbed by water, remove disturbed material to firm undisturbed mater ial after water is brought under control. Replace disturbed subgrade i n trenches with concrete or material approved by the Resident Engin eer.

D. Proofrolling:

1. After rough grade has been established in cut ar eas and prior to placement of fill in fill areas under building and pavements, proofroll exposed subgrade with a fully loaded dump truck to check for pockets of soft material.

31 20 00-11

2. Proofrolling shall consist of at least two compl ete passes with one pass being in a direction perpendicular to precedin g one. Remove any areas that deflect, rut, or pump excessively during proofrolling, or that fail to consolidate after successive passes to suitable soils and replaced with compacted fill. Maintain subgrade until succeeding operation has been accomplished.

E. Building Earthwork:

1. Excavation shall be accomplished as required by drawings and specifications.

2. Excavate foundation excavations to solid undistu rbed subgrade.

3. Remove loose or soft materials to a solid bottom .

4. Fill excess cut under footings or foundations wi th 25 MPa (3000 psi) concrete poured separately from the footings.

5. Do not tamp earth for backfilling in footing bot toms, except as specified.

6. Slope grades to direct water away from excavatio ns and to prevent ponding.

F. Trench Earthwork:

1. Utility trenches (except sanitary and storm sewe r):

a. Excavate to a width as necessary for sheeting an d bracing and proper performance of the work.

b. Grade bottom of trenches with bell holes scooped out to provide a uniform bearing.

c. Support piping on undisturbed earth unless a mec hanical support is shown.

d. Length of open trench in advance of piping layin g shall not be greater than is authorized by Resident Engineer.

2. Sanitary and storm sewer trenches:

a. Trench width below a point 150 mm (6 inches) abo ve top of pipe shall be 600 mm (24 inches) maximum for pipe up to and including

300 mm (12 inches) diameter, and four-thirds diamet er of pipe plus

200 mm (8 inches) for pipe larger than 300 mm (12 i nches). Width of trench above that level shall be as necessary fo r sheeting and bracing and proper performance of the work.

b. Bed bottom quadrant of pipe on undisturbed soil or granular fill.

1) Undisturbed: Bell holes shall be no larger than necessary for jointing. Backfill up to a point 300 mm (12 inches) above top of pipe shall be clean earth placed and tamped by h and.

2) Granular Fill: Depth of fill shall be a minimum of 75 mm (3 inches) plus one sixth of pipe diameter below pipe to 300 mm

31 20 00-12

(12 inches) above top of pipe. Place and tamp fill material by hand. Granular fill shall extend to subgrade beneat h paved areas and as shown on the drawings.

c. Place and compact as specified remainder of back fill using acceptable excavated materials. Do not use unsuitab le materials.

d. Use granular fill for bedding where rock or rock y materials are excavated.

G. Site Earthwork: Earth excavation includes excava ting pavements and obstructions visible on surface; underground struct ures, utilities, and other items indicated to be removed; together with soil, boulders, and other materials not classified as rock or unauthori zed excavation.

Excavation shall be accomplished as required by dra wings and specifications. Excavate to indicated elevations an d dimensions within a tolerance of plus or minus 25 mm (1 inch). Extend e xcavations a sufficient distance from structures for placing and removing concrete formwork, for installing services and other constru ction, complying with

OSHA requirements, and for inspections. Remove subg rade materials that are determined by Resident Engineer as unsuitable, and replace with acceptable material. When unsuitable material is en countered and removed, contract price and time will be adjusted i n accordance with

Articles, DIFFERING SITE CONDITIONS, CHANGES and CH ANGES-SUPPLEMENT of the GENERAL CONDITIONS as applicable. Adjustments t o be based on volume in cut section only.

1. Site Grading:

a. Provide a smooth transition between adjacent exi sting grades and new grades.

b. Cut out soft spots, fill low spots, and trim hig h spots to comply with required surface tolerances.

c. Slope grades to direct water away from buildings and to prevent ponds from forming where not designed. Finish subgr ades to required elevations within the following tolerances :

1) Lawn or Unpaved Areas: Plus or minus 25 mm (1 in ch).

2) Walks: Plus or minus 25 mm (1 inch).

3) Pavements: Plus or minus 13 mm (1/2 inch).

d. Grading Inside Building Lines: Finish subgrade t o a tolerance of

13 mm (1/2 inch) when tested with a 3000 mm (10 foo t) straightedge.

3.3 UNDERPINNING

A. Design of the underpinning system is the respons ibility of the

Contractor and is subject to review and approval by the Resident

31 20 00-13

Engineer. Underpinning of existing building founda tions, as indicated on structural drawings, or where excavation undermi nes existing foundations, shall be accomplished in the following manner:

1. Make general excavation for new construction, wh ere new foundations are to be below existing foundations, to elevation of new foundations

(or sized stone subbase), maintaining a 45 degree s loped berm.

2. For underpinning pits, underpin existing wall fo undations by excavating 1200 mm (4 feet) wide pits to depth show n on drawings skipping 3 sections at any one time so as to mainta in support for wall at all times.

3. Underpin intervening sections one at a time; no adjacent sections shall be underpinned until concrete in adjacent sec tions shall have reached 20 MPa (2500 psi) strength and have been dr y packed with non-shrink grout to obtain positive bearing. Sheet and brace underpinning pits if soil will not stand on a vertical cut durin g this operation, or as required for safety of workmen. Repack any vo ids behind sheeting to prevent sloughing which could cause set tlement of existing foundations. Contractor performing this po rtion of work shall have been prequalified by Resident Engineer a s having previously performed successfully this type of work or will demonstrate his capability for successfully perform ing this work. It shall be sole responsibility of the Contractor to g uard against objectionable movement or settlement and to preserv e integrity of existing structures.

4. The tip elevation of the underpinning pits shall be a minimum of 900 mm (3 feet) below the adjacent excavation elevation .

5. Subgrades at the tip of the underpinning pit sha ll be clean, dry, and free of debris and shall be observed by the Residen t Engineer prior to concrete placement.

6. Concrete shall not be free fall greater than 300 0 mm (10 feet) into the pit.

3.4 FILLING AND BACKFILLING

A. General: Do not fill or backfill until all debri s, water, unsatisfactory soil materials, obstructions, and deleterious mater ials have been removed from excavation. For fill and backfill, use excavated materials and borrow meeting the criteria specified herein, a s applicable. Borrow will be supplied at no additional cost to the Gover nment. Do not use unsuitable excavated materials. Do not backfill unt il foundation walls have been completed above grade and adequately brac ed, waterproofing or dampproofing applied, foundation drainage, and pipe s coming in contact

31 20 00-14 with backfill have been installed and work inspecte d and approved by

Resident Engineer.

B. Placing: Place materials in horizontal layers no t exceeding 200 mm (8 inches) in loose depth for material compacted by he avy compaction equipment, and not more than 100 mm (4 inches) in l oose depth for material compacted by hand-operated tampers and the n compacted. Place backfill and fill materials evenly on all sides of structures to required elevations, and uniformly along the full l ength of each structure. Place no material on surfaces that are m uddy, frozen, or contain frost.

C. Compaction: Compact with approved tamping roller s, sheepsfoot rollers, pneumatic tired rollers, steel wheeled rollers, vib rator compactors, or other approved equipment (hand or mechanized) well suited to soil being compacted. Do not operate mechanized vibratory comp action equipment within 3000 mm (10 feet) of new or existing buildin g walls without prior approval of Resident Engineer. Moisten or aerate ma terial as necessary to provide moisture content that will readily facil itate obtaining specified compaction with equipment used. Compact s oil to not less than the following percentages of maximum dry density, a ccording to ASTM

D1557 as specified below:

1. Fills, Embankments, and Backfill

a. Under proposed structures, building slabs, steps , paved areas, curbs, curbs and gutters, and under Sidewalks scari fy and recompact top 300 mm (12 inches) of existing subgra de and each layer of backfill or fill material in accordance wi th ASTM D1557

92 percent. Compact all minus-graded, crushed limes tone in accordance with ASTM D1557 95 percent. Compact all cohesive soil located below the minus-graded, crushed limestone a nd below the top 300 mm (12 inches) of soil subgrade in accordan ce with ASTM

D1557 90 percent.

b. Landscaped areas, top 300 mm (12 inches) ASTM D1 557 85 percent.

c. Landscaped areas, below 300 mm (12 inches) of fi nished grade, ASTM

D1557 90 percent.

2. Natural Ground (Cut or Existing)

a. Under building slabs, steps and paved areas, top 150 mm (6 inches), ASTM D1557 92 percent.

b. Curbs, curbs and gutters, top 150 mm (6 inches), ASTM D1557 92 percent.

c. Under sidewalks, top 150 mm (6 inches), ASTM D15 57 92 percent.

31 20 00-15

3.5 GRADING

A. General: Uniformly grade the areas within the li mits of this section, including adjacent transition areas. Smooth the fin ished surface within specified tolerance. Provide uniform levels or slop es between points where elevations are indicated, or between such poi nts and existing finished grades. Provide a smooth transition betwee n abrupt changes in slope.

B. Cut rough or sloping rock to level beds for foun dations. In pipe spaces or other unfinished areas, fill low spots and level off with coarse sand or fine gravel.

C. Slope backfill outside building away from buildi ng walls for a minimum distance of 1800 mm (6 feet).

D. Finish grade earth floors in pipe basements as s hown to a level, uniform slope and leave clean.

E. Finished grade shall be at least 150 mm (6 inche s) below bottom line of window or other building wall openings unless great er depth is shown.

F. Place crushed stone or gravel fill under concret e slabs on grade, tamped, and leveled. Thickness of fill shall be 150 mm (6 inches) unless otherwise shown.

G. Finish subgrade in a condition acceptable to Res ident Engineer at least one day in advance of paving operations. Maintain f inished subgrade in a smooth and compacted condition until succeeding ope ration has been accomplished. Scarify, compact, and grade subgrade prior to further construction when approved compacted subgrade is di sturbed by

Contractor's subsequent operations or adverse weath er.

H. Grading for Paved Areas: Provide final grades fo r both subgrade and base course to +/- 6 mm (0.25 inches) of indicated grade s.

3.6 DISPOSAL OF UNSUITABLE AND EXCESS EXCAVATED MATERIAL

A. Remove from site and dispose of any excess excav ated materials after all fill and backfill operations have been completed.

B. Segregate all excavated contaminated soil design ated by the Resident

Engineer from all other excavated soils, and stockp ile on site on two

0.15 mm (6 mil) polyethylene sheets with a polyethy lene cover. A designated area shall be selected for this purpose. Dispose of excavated contaminated material in accordance with State and Local requirements.

3.7 CLEAN UP

A. Upon completion of earthwork operations, clean a reas within contract limits, remove tools, and equipment. Provide site c lear, clean, free of debris, and suitable for subsequent construction op erations. Remove all debris, rubbish, and excess material from Medical C enter Property.

31 20 00-16

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36C10F18R0688 East Campus Demolition & Roadway

32 12 16-1

SECTION 32 12 16

ASPHALT PAVING

PART 1 - GENERAL

1.1 DESCRIPTION

A. This work shall cover the composition, mixing, c onstruction upon the prepared subgrade, and the protection of hot asphal t concrete pavement.

The hot asphalt concrete pavement shall consist of an aggregate or asphalt base course and asphalt surface course cons tructed in conformity with the lines, grades, thickness, and cross sectio ns as shown. Each course shall be constructed to the depth, section, or elevation required by the drawings and shall be rolled, finished, and approved before the placement of the next course.

1.2 RELATED WORK

A. Laboratory and field testing requirements: Secti on 01 45 29, TESTING

LABORATORY SERVICES.

B. Waste Management: Comply with the requirements o f Section 01 74 19, CONSTRUCTION WASTE MANAGEMENT, for removal and disp osal of construction debris and waste.

C. Subgrade Preparation: Paragraph 3.3 and Section 31 20 00, EARTH MOVING.

D. Pavement Markings: Section 32 17 23, PAVEMENT MA RKINGS.

1.3 INSPECTION OF PLANT AND EQUIPMENT

A. The Resident Engineer shall have access at all t imes to all parts of the material producing plants for checking the mixing o perations and materials and the adequacy of the equipment in use.

1.4 ALIGNMENT AND GRADE CONTROL

A. The Contractor’s Registered Professional Land Su rveyor shall establish and control the pavement (aggregate or asphalt base course and asphalt surface course) alignments, grades, elevations, and cross sections as shown on the Drawings.

1.5 SUBMITTALS

A. In accordance with Section 01 33 23, SHOP DRAWIN GS, PRODUCT DATA, AND

SAMPLES, furnish the following:

B. Data and Test Reports:

1. Aggregate Base Course: Sources, gradation, liqui d limit, plasticity index, percentage of wear, and other tests required by State Highway

Department.

32 12 16-2

2. Asphalt Base/Surface Course: Aggregate source, g radation, soundness loss, percentage of wear, and other tests required by State Highway

Department.

3. Job-mix formula.

C. Certifications:

1. Asphalt prime and tack coat material certificate of conformance to

State Highway Department requirements.

2. Asphalt cement certificate of conformance to Sta te Highway Department requirements.

3. Job-mix certification - Submit plant mix certifi cation that mix equals or exceeds the State Highway Specification.

D. Provide MSDS (Material Safety Data Sheets) for a ll chemicals used on ground.

PART 2 - PRODUCTS

2.1 GENERAL

A. Aggregate base Asphaltic base and asphalt concre te materials shall conform to the requirements of the following and ot her appropriate sections of the latest version of the State Highway Material

Specifications, including amendments, addenda and e rrata. Where the term

"Engineer" or "Commission" is referenced in the Sta te Highway

Specifications, it shall mean the Resident Engineer or VA Contracting

Officer.

2.2 AGGREGATES

A. Provide aggregates consisting of crushed stone, gravel, sand, or other sound, durable mineral materials processed and blen ded, and naturally combined.

B. Subbase aggregate (where required) maximum size: 38mm(1-1/2").

C. Base aggregate maximum size:

1. Base course over 152mm(6") thick: 38mm(1-1/2");

2. Other base courses: 19mm(3/4").

D. Asphaltic base course:

1. Maximum particle size not to exceed 25.4mm(1”).

2. Where conflicts arise between this specification and the requirements in the latest version of the State Highway Specific ations, the State

Specifications shall control.

E. Aggregates for asphaltic concrete paving: Provid e a mixture of sand, mineral aggregate, and liquid asphalt mixed in such proportions that the percentage by weight will be within:

Sieve Sizes Percentage Passing

32 12 16-3

19mm(3/4") 100

9.5mm(3/8") 67 to 85

6.4mm(1/4") 50 to 65

2.4mm(No. 8 mesh) 37 to 50

600µm(No. 30 mesh) 15 to 25

75µm(No. 200 mesh) 3 to 8 plus 50/60 penetration liquid asphalt at 5 percent to 6-1/2 percent of the combined dry aggregates.

2.3 ASPHALTS

A. Comply with provisions of Asphalt Institute Spec ification SS2:

1. Asphalt cement: Penetration grade 50/60

2. Prime coat: Cut-back type, grade MC-250

3. Tack coat: Uniformly emulsified, grade SS-1H

2.4 SEALER

A. Sealer only required for pavement repair area s that may be required

Adjacent to new work.

B. Provide a sealer consisting of suitable fibrated chemical type asphalt base binders and fillers having a container consist ency suitable for troweling after thorough stirring, and containing n o clay or other deleterious substance.

C. Where conflicts arise between this specification and the requirements in the latest version of the State Highway Specificati ons, the State

Specifications shall control.

PART 3 - EXECUTION

3.1 GENERAL

A. The Asphalt Concrete Paving equipment, weather l imitations, job-mix formula, mixing, construction methods, compaction, finishing, tolerance, and protection shall conform to the requirements of the appropriate sections of the State Highway Specifications for th e type of material specified.

3.2 MIXING ASPHALTIC CONCRETE MATERIALS

A. Provide hot plant-mixed asphaltic concrete pavin g materials.

1. Temperature leaving the plant: 143 degrees C(290 degrees F) minimum, 160 degrees C(320 degrees F) maximum.

2. Temperature at time of placing: 138 degrees C(28 0 degrees F) minimum.

3.3 SUBGRADE

A. Shape to line and grade and compact with self-pr opelled rollers.

B. All depressions that develop under rolling shall be filled with acceptable material and the area re-rolled.

32 12 16-4

C. Soft areas shall be removed and filled with acce ptable materials and the area re-rolled.

D. Should the subgrade become rutted or displaced p rior to the placing of the subbase, it shall be reworked to bring to line and grade.

E. Proof-roll the subgrade with maximum 45 tonne (5 0 ton) gross weight dump truck as directed by Resident Engineer or VA Contra cting Officer. If pumping, pushing, or other movement is observed, re work the area to provide a stable and compacted subgrade as directed by the Resident

Engineer.

3.4 BASE COURSES

A. Subbase (when required)

1. Spread and compact to the thickness shown on the drawings.

2. Rolling shall begin at the sides and continue to ward the center and shall continue until there is no movement ahead of the roller.

3. After completion of the subbase rolling there sh all be no hauling over the subbase other than the delivery of materia l for the top course.

B. Base

1. Spread and compact to the thickness shown on the drawings.

2. Rolling shall begin at the sides and continue to ward the center and shall continue until there is no movement ahead of the roller.

3. After completion of the base rolling there shall be no hauling over the base other than the delivery of material for th e top course.

C. Thickness tolerance: Provide the compacted thick nesses shown on the

Drawings within a tolerance of minus 0.0mm (0.0") t o plus 12.7mm (0.5").

D. Smoothness tolerance: Provide the lines and grad es shown on the Drawings within a tolerance of 5mm in 3m (3/16 inch in ten f eet).

E. Moisture content: Use only the amount of moistur e needed to achieve the specified compaction.

3.5 PLACEMENT OF ASPHALTIC CONCRETE PAVING

A. Remove all loose materials from the compacted ba se.

B. Apply the specified prime coat, and tack coat wh ere required, and allow to dry in accordance with the manufacturer’s recomm endations as approved by the Architect or Engineer.

C. Receipt of asphaltic concrete materials:

1. Do not accept material unless it is covered with a tarpaulin until unloaded, and unless the material has a temperature of not less than

130 degrees C(280 degrees F).

32 12 16-5

2. Do not commence placement of asphaltic concrete materials when the atmospheric temperature is below 10 degrees C (50 d egrees F), not during fog, rain, or other unsuitable conditions.

D. Spreading:

1. Spread material in a manner that requires the le ast handling.

2. Where thickness of finished paving will be 76mm (3") or less, spread in one layer.

E. Rolling:

1.…