03400_Precast_Concrete_Underground_Structures_2026.pdf

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STANDARD SPECIFICATIONS

SECTION 03400

PRECAST CONCRETE UNDERGROUND STRUCTURES

PART 1 GENERAL

1.1 DESCRIPTION

A. Section includes requirements for providing precast concrete underground structures, including manholes, valve vaults, and other specified underground miscellaneous items (as applicable).

1.2 REQUIREMENTS FOR MANUFACTURERS AND SUPPLIERS BEFORE DELIVERY

A. MANUFACTURERS AND SUPPLIERS QUALIFICATION.

1. Manufacturers of precast structures and assemblies for the precast structures shall be pre-approved through WSSC Material Evaluation Process and listed as approved manufacturers in pertinent divisions of this Specification.

2. Certification of the precast manufacturer may include a plant inspection performed by WSSC Engineer in order to evaluate the production process, quality control procedures and confirm a compliance of the supporting documentation.

3. Precast manufacturers shall submit shop drawings and calculations for select structures, including vaults and some manholes for structural engineer’s review and pre-approval.

4. Pre-approved underground precast structures are listed in Nomenclature Tables specific for each Manufacturer and provided in Appendices to this Section.

Nomenclature of pre-approved structures may be updated within a month upon structural engineer’s review and approval of newly submitted items.

5. WSSC Engineer will perform plant re-certification every three (3) years in order to complete process inspections and confirm a compliance of the documentation. The required documentation shall include but not be limited to the following:

a. Requirements of precast concrete structures production (quality of the products)

b. Quality control lab/Quality control facility on site

c. Management policy on implementing a Quality Control program that monitors quality and reports on conformance with requirements.

d. Qualified Personnel (Training records of all employees)

e. Product pre-pour, casting, post-pour and final inspection procedures

f. Plant curing procedures for all seasons

g. Product repair policy and procedures

h. Minimum strength requirements for stripping and shipping product

i. Product dimensional tolerances

j. Form tolerances and maintenance policy

k. Mix design qualification and testing procedures

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l. Raw material testing policy and procedures

m. Equipment calibration policy and procedures

n. Examples of all documentation and forms used by plant to record Quality

Control and production processes

o. Concrete data and standards

p. Drawings demonstrating applicability to industry design standards

q. Any other material used in production of precast concrete structures, ex.

Reinforcing bars

B. Testing and Inspection.

1. Quality Control for Factory and Site Inspected Material, including Testing and

Inspection procedures shall follow requirements of Section 01450.

2. Engineer may inspect and test all precast structures, fittings, lining and joint material after delivery to site or at factory.

3. Manufacturer or Supplier shall furnish materials for tests and labor to assist

Engineer with tests.

4. Manufacturer or Supplier shall provide concrete design mix for precast vault and manhole sections showing sieve analysis for aggregates, suppliers of materials, and thirty (30) 28-day compressive strength test results performed within 1 year of submittal.

C. Storage and Handling.

1. Manufacturer or Supplier:

a. Store reinforcing steel off ground in well drained area to minimize deterioration and prevent deformation.

b. Aggregates and sand: Store on concrete slab and handle to maintain separation and to prevent infiltration of deleterious materials.

c. Completed structures: Store off ground using wood blocks, pallets, or other appropriate means to give ample space between rows and individual pieces, and with enough clearance above and below to allow full view of walls and joint ends for inspection purposes.

d. Joint ends: Keep clean and off ground.

2. Manufacturer's Batching Plant, Casting Equipment, and Curing Facilities:

Complete, operating properly, and of proper size and range.

3. Manufacturer's Records: Show evidence of continual maintenance and quality control over casting forms and joint forming rings.

D. Shipment Identification: Before inspection of precast structures for an order, manufacturer or supplier shall furnish to Engineer:

1. Commission’s Contract Number.

2. Contractor's name.

3. Section sizes.

4. Footage or number of pieces required to fill order.

5. Evidence that concrete has cured to minimum 80 percent of design strength.

E. Ship only Commission approved precast concrete structures to Contract site.

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F. Repairs: Follow manufacturer's procedures filed with Engineer.

G. Manufacturer or Supplier: Follow standard cold weather concreting practices of ACI

306R "Cold Weather Concreting."

1. Engineer may make special requirements to ensure quality.

H. Code Compliance: Comply with the latest addition of applicable standards, codes and regulations:

1. ACI 301 – Specification for Structural Concrete

2. ACI 350 – Code Requirements for Environmental Engineering Concrete Structures

3. ACI 318 - Building Code Requirements for Structural Concrete

4. ASCE 7 – Minimum Design Loads and Associated Criteria for Buildings and Other

Structures.

5. AASHTO 17th Edition - Standard Specifications for Highway Bridges.

6. ASTM A36 – Standard Specification for Carbon Structural Steel.

7. ASTM A1064/A1064M – Standard Specification for Carbon Steel Wire and

Welded Wire Reinforcement, Plain and Deformed, for Concrete.

8. ASTM A153/A153M – Standard Specification for Zinc Coating (Hot-Dip) on Iron and Steel Hardware.

9. ASTM A615/A615M – Standard Specification for Deformed and Plain Carbon

Steel Bars for Concrete Reinforcement.

10. ASTM C150/C150M – Standard Specification for Portland Cement.

11. ASTM C1107/C1107M - Standard Specification for Packaged Dry, Hydraulic-

Cement Grout (Non-Shrink).

12. ASTM C478 – Standard Specification for Circular Precast Reinforced Concrete

Manhole Sections.

13. ASTM C858 – Standard Specification for Underground Precast Concrete Utility

Structures.

14. ANSI/AWS D1.1 – Structural Welding (steel).

15. ANSI/AWS D1.2 - Structural Welding (aluminum).

16. PCI MNL-116 - Manual for Quality Control for Plants and Production of Structural

Precast Concrete Products.

17. PCI MNL-120 - PCI Design Handbook-Precast and Prestressed Concrete.

18. PCI MNL-123 – Connections Manual: Design and Typical Details of Connections for Precast and Prestressed Concrete.

19. AA ADM - Aluminum Design.

20. WSSC Standard Details for Construction.

1.3 SUBMITTALS

A. Submit following Section 01330.

1. Shop Drawings: Show complete details, pertinent calculations, design loads, materials, strengths, sizes, and thicknesses, joint and connection design and details of all assemblies for precast structures.

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a. Reinforcing steel following ACI 315, including bar lists and bending diagrams, placement drawings, and special details.

b. Location, types, and details of joints.

c. Sequence of pours.

d. Calculations showing concrete strength to be attained at proposed time of removal of formwork, falsework, and centering.

e. Aluminum Ladders per WSSC Standard Details for Construction.

f. Floor/Vault Doors/Hatches certified for the design loads explicated herein.

g. Seals for all pipes penetrating walls and slabs of the structure.

h. Lifting devices and anchors.

i. Joint sealants.

j. Frame and cover assemblies.

2. Waivers.

a. Shop drawing submittal waived when:

1) Approved design drawings and calculations for precast underground structures are on file with WSSC Structural Engineer following the review and approval of the application as stipulated in the Material Evaluation Process accessible via WSSC website AND

2) The manufacturer followed the precast supplier’s re-certification process as stipulated in this Specification AND

3) Installation Methods for precast sections are on file with WSSC Engineer.

b. To obtain waiver submit letter citing:

1) Commission’s Contract Number.

2) Precast underground structure manufacturer.

3) Approved design drawing number.

c. Date of the plant certification/re-certification. If Standard WSSC Details or specifications change, new submittals will be required.

3. Coating manufacturer’s catalog data for lining interior surfaces of precast concrete manholes, including recommendations for surface preparation, application, curing, handling, and repair procedures for coated manhole sections.

B. Submit following Section 01450.

1. Certificate of Compliance:

a. Precast Manhole Manufacturer or Supplier: Flexible connector assembly, including seals and metallic or non-metallic mechanical devices used therein.

b. Manhole lining material meets physical property requirements of lining manufacturer and passes in-plant tests, as recommended by lining manufacturer.

c. Engineer may require manufacturer or supplier to furnish test results substantiating certificate of compliance, or in case of failure, may elect to witness testing to his or her satisfaction.

2. Certified Test Reports:

a. Aggregates, cement, admixtures, and steel reinforcement used in production of vaults, manhole sections, and grade rings following ASTM.

b. Initial reports with above referenced concrete design mixes.

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1.4 DELIVERY, STORAGE, AND HANDLING

A. Suitability of Precast Structures for Transport to Contract Site: When concrete has cured to minimum of 80 percent of design strength.

B. Storage.

1. Store off ground on wood blocks, pallets, or other appropriate means away from brush, and in area accessible for inspection.

2. Do not place excavated or other material over or against stored precast structures.

C. Handling of Precast Structures and Appurtenances: Unload and handle with crane, backhoe, or equipment of adequate capacity, equipped with appropriate slings and lifting devices to protect material from damage.

D. Repair or Replacement.

1. When Engineer deems repairable: Repair as directed by Engineer.

2. When Engineer deems not repairable: Remove and replace as directed by Engineer before initiating work.

3. Repair or replacement of defective or damaged material and equipment that

Engineer deems unsuitable for installation or acceptance, will be at no cost to the Commission.

1.5 DESIGN REQUIREMENTS

A. Design of the underground precast structures shall include the following information.

1. All design criteria used for in the analysis, including but not limited to:

a. List of current codes and other references used in the design

b. Assumed structural loads and unit weights and properties of the relevant materials loading the structure

c. Structural properties of the materials comprising the structure

2. Drawings and schematic diagrams showing:

a. Configuration and dimensions of the subject structure

b. Schematic diagrams showing all applicable loads and load combinations

3. Analysis of the structure based on maximum forces resulting from the most unfavorable combinations of design loads, including but not limited to:

a. H20 loading as following:

b. 1’-0” cover (pavement) subjected to the maximum impact of 30%

c. Concentrated wheel load applied in the most critical location of the top slab or beams

d. Surcharge loads on structure’s wall generated by traffic

e. Soil loading based on the following assumptions:

- Soil cover – 5’-0”

- Surcharge – 2’-0”

- Water Table at 1’-0” below finished grade

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f. Minimum uniform live load at the bottom slab of the underground structure is P=300 psf (pounds per square foot), unless otherwise indicated

g. Structural evaluation of the proposed Floor/Vault/Door/Hatches for the H20 design loads explicated herein

h. Buoyancy evaluation based on the assumed soil/water conditions and proposed structure configuration and weight

4. Analysis of the structure shall include but not to be limited to:

a. Statement of the structural acceptance criteria including anticipated safety factors (SF)

b. Locations and values of the loads and reactions generated by the most critical load combinations

c. Locations and values of the moments and shear forces generated by the most critical load combinations, including lifting, transportation and installation

d. Confirmation of resistance to maximum moments and shear forces in most critical for the structural component locations (e.g. mid-span, support at concentrated load, etc.)

e. Confirmation of compliance of maximum deflections (as required)

f. Cracking control (as applicable)

1.6 DESIGN CRITERIA

A. General Requirements

1. Design of underground precast structures shall be performed per ACI 350 Code Requirements for Environmental Engineering Concrete Structures

2. Design of the underground precast structures shall be done by a qualified Professional Engineer registered in State of Maryland

3. Underground precast structures and members of the structures shall support superimposed loads as required by applicable standards and loads, and stresses due to handling, transportation and installation

4. Design of the underground precast structures shall accommodate construction tolerances, installation of the necessary assemblies and clearances of intended openings.

1.7 SHOP DRAWINGS

A. Set of shop drawings shall reflect all design information provided in the calculation set, including but not limited to geometry of the structure and dimensions of the structural members, material properties, concrete protection for reinforcement, spacing and bar diameters, etc.

B. Each drawing of the set shall have sufficient identification and references per industry standards; each drawing set shall have adequate presentation of the structure, including but not limited to plans, elevations and sections of the structure, all necessary details and notes, sufficient for the production of the unit.

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C. All Shop Drawing Plans shall include but not be limited to the following:

1. Plans and Elevations of the structure providing sufficient information of the overall dimensions, wall/slab thickness, dimensions for the access to the vault/manhole, locations and details of all assemblies delivered by the Manufacturer (ladder, vault/manhole entry hatches/covers and frames, lifting devices/anchors. Sleeves, joint sealants/gaskets, etc.), captions and references indicating the section and elevations.

2. Sections through Top Slab, Walls, Joint Details, appurtenances shall include the dimensions, captions, spacings, and reinforcement.

3. Reinforcement drawing(s) of the Top Slab, base and Riser sections (as applicable)

a. Slab/wall thickness and concrete covers per ACI 350;

b. Top/Bottom mat(s) for slabs and wall reinforcement shall contain concrete reinforcement information, spacings, direction, etc.;

c. Reinforcement details, including but not limited to:

1) Additional reinforcement information for pipe penetrations;

2) Additional reinforcement around slab openings;

3) Wall/Slab corner reinforcement with reinforcement overlaps;

4) Stirrups configuration and spacing as required by design;

5) Additional reinforcement at sump

PART 2 PRODUCTS

2.1 MATERIALS

A. Reinforced Concrete Materials: Follow Section 03300 and modification herein, except slump requirement shall not apply to manholes.

B. Precast Concrete Manholes: ASTM C478 except:

1. Compressive Design Strength of Concrete:

a. Minimum 5000 psi using Type II cement.

b. Minimum compression cylinder test of 4000 psi at time of shipment.

2. Configurations: Follow Drawings and Standard Details.

3. Joints: ASTM C443.

4. Sizes: Furnish in heights of 1 foot minimum. Do not use more than one, 1 foot section in each manhole.

5. Appurtenances.

a. Steps: Manufactured and of style specified in Section 02530.

b. Bolt inserts: Follow Standard Details.

1) Embed one of following, minimum of 3 inches to accommodate 3/4 inch diameter bolts.

a) Heckmann Building Products Inc., No. 444 Star Threaded Inserts.

b) Pennsylvania Insert Corporation, the Liberator.

c) Atlantic Concrete Products Inc., Bolt Slot Insert System.

d) Strut Service Company inserts.

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2) Provide with plugs for transport to Contract site.

6. Flexible Gasket Connectors: ASTM C923.

a. Stainless steel, Type 304 may be used when not in contact with sewage or sewage gas.

b. Identification: Permanent markings of date and production runs.

c. Approved manufacturers for connectors connecting with diameter dimension of ductile iron pipes, polyvinyl chloride (PVC) ASTM D3034, and PVC ASTM F679 to sewer manholes:

1) A-LOK Products Inc., A-LOK or A-LOK X-CEL.

2) Chardon Rubber Company, Lock Joint Flexible Manhole Sleeve.

3) Hail Mary Rubber Co., Star Seal.

4) Press Seal Gasket Corporation, Press Boot, PSX Series, Econoseal, CAST-A-SEAL® 12-08 Cast In Boot, or equal.

5) Trelleborg Pipe Seals Milford, Inc., NPC KOR-N-SEAL I Toggle

Korband with Series 106 or 406 rubber boot.

6) International Precast Supply, Cobra Style, Toggle Style, and Adjustment

Style.

d. Approved manufacturers for connectors for inserting pressure sewer piping through manhole walls:

1) A-LOK Products, Inc., Z-LOK.

2) Press Seal Gasket Corporation, 8QRS-PSX Positive Seal System.

3) Or equal.

e. Approved connector manufacturers for closed profile PVC pipe for ASTM F1803 Pipe "Manhole Pipe":

1) Press Seal Gasket Corporation.

2) A-LOK X-CEL.

3) Or Equal.

f. For connectors for profile PVC pipe for ASTM F794, use special adapter meeting profile dimensions approved by the pipe manufacturer.

g. Approved connector manufacturers for PVC pipe with AWWA C900/C905:

1) Pipe on slopes greater than 10 percent but no greater than 20 percent:

a) Atlantic Concrete Products Z-LOK.

b) Press-Seal Gasket Corporation.

Pipe Size Diameter

Manufacturer’s Gasket Designation Manhole

Opening

4 inch 8QRS 8 inch 6 inch 12Y 12 inch 8 inch 12M 12 inch 10 inch 16Y 16 inch 12 inch 16M 16 inch

2) Pipe on slopes greater than 20 percent but no greater than 35 percent:

a) Atlantic Concrete Products Z-LOK.

b) Or equal.

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h. Other pipe connectors: Recommended by pipe manufacturer and approved by Engineer.

7. Precast Channels/Benches:

a. Compressive design strength of concrete:

1) Minimum 28 day compressive strength of 4000 psi using Type II cement.

2) Compressive strength of 3200 psi at time of shipment.

b. Construction and finish:

1) Furnish access for jointing pipes to flexible manhole connectors.

2) Once channel/bench has been poured and initial concrete set has taken place, add no additional concrete to modify shape or repair defects.

3) Top surface of bench: Brush or light broom finish.

4) Channels: Troweled smooth surface.

c. Sizes:

1) Lining: Minimum following Standard Details.

2) Slopes.

a) Bench: Slope toward channel with maximum 1 inch vertical drop for each foot horizontal.

b) Channels: Slope smoothly and uniformly from incoming pipes to outlet pipe.

3) Width and height.

a) Match inside diameters of incoming and outgoing pipes and blend channel to smooth contour.

b) Deviations to channel width above spring line of pipe and at flexible connectors; Permitted for this purpose with Engineer's approval.

8. Manhole Identification: Clearly marked on inside near top where applicable.

a. ASTM Specification designation.

b. Manhole setting number (bases only) and WSSC Contract number.

c. Date of manufacture.

d. Production control number for tracking manufacture phases of item and name or trademark of manufacturer.

e. Manhole sections with flexible connectors:

1) Marked above connector openings with type and size, and type of pipe for which connector is designed.

2) Engraved or stenciled markings with waterproof paint or ink in minimum 1-inch-high letters.

f. Lined manholes: Stenciled with waterproof paint or ink markings as noted herein that cannot be easily removed from lining or epoxy coated surfaces.

9. Precast Manhole Sections.

a. Approved Manufacturers:

1) Oldcastle Precast, Fredericksburg, VA and Edgewood, MD plants only.

2) Gillespie Precast, LLC., Chestertown MD.

3) Concrete Pipe and Precast, Martinsburg, WV.

4) Atlantic Concrete Products Company, Cockeysville, MD.

5) Contractors Precast Corporation, Davidsonville, MD.

1. Approval Notes:

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1) All pre-approved precast products provided by the Approved Manufacturers listed above are itemized in the Appendix II, Precast Manhole Nomenclature specific for each Manufacturer.

2) Submittal of Shop Drawings and Calculations for the pre-approved precast structures listed in the Appendices may be waived following Submittal Waiver procedure stipulated in Submittal Section 1.3 herein.

3) Structures which are not listed in the Appendices are subject for the submittal for full review and approval by WSSC Engineer(s).

10. Lined Manholes: Concrete Protective Liner or Epoxy Resin Mortar.

a. Concrete Protective Liner.

1) Cover interior surfaces except at penetrations and channels.

2) After installation, seal penetrations and other non-lined interior concrete surfaces following manufacturer’s recommendation.

3) Approved manufacturers:

a) Dura Plate 100 PVC liner, A-LOK Products Incorporated, Tullytown, Pennsylvania.

b) T-Lok PVC liner, Ameron Protective Linings.

c) AGRU Sure-Grip HDPE liner, AgruAmerica.

d) Or approved equal.

b. Epoxy Resin Mortar.

1) Coat interior concrete surfaces, except channels, with 0.125 inch thick cementitious corrosion and abrasion resistant epoxy resin mortar.

2) Approved supplier and product:

a) Nitomortar EL, FOSROC Incorporated.

b) Or approved equal.

11. Precast Concrete Grade Rings: ASTM C478, except:

a. Compressive Design Strength of Concrete: Minimum 5000 psi using Type II cement.

b. Configurations: Follow Standard Details.

c. Rings: Drilled with holes 1-1/2 to 2-inch diameter to accommodate frame anchor bolts.

d. Grade rings with cracks or fractures passing through height of ring and any continuous crack extending for length of 3 inches or more will be rejected.

1) Rings with damaged edges which will prevent making satisfactory joint will be rejected.

2) Planes of ring surfaces: Within limits of plus or minus 1/4 inch of horizontal and vertical, except for sloped adjusting grade ring to be within 1/4 inch of Standard Detail.

3) Protection on lined manholes: Follow manufacturer’s recommendations.

e. Approved manufacturers:

1) Atlantic Concrete Products Company.

2) Concrete Pipe and Precast.

3) Contractors Precast Corporation.

4) Gillespie Precast, LLC.

5) A.C. Miller.

6) Smith Midland Corporation.

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7) Oldcastle Precast.

C. Precast Concrete Vaults: ASTM C858.

1. Configurations: Follow Drawings.

2. Identification: Clearly mark inside of each precast concrete vault section.

a. ASTM Designation.

b. Vault size.

c. Date of manufacture.

d. Contract station location and WSSC Contract number.

e. Name or trademark of manufacturer.

f. Mark slabs on top and bottom surfaces.

3. Design Mixes:

a. 5000 psi at 28 days using Type II cement.

b. Mix proportion: ACI 318.

4. Approved Manufacturers:

a. A. C. Miller, Spring City, PA plant only.

b. Smith- Midland Corp., Midland, VA plant only.

c. Oldcastle Precast, Fredericksburg, VA and Edgewood, MD plants only.

d. Gillespie Precast, LLC, Chestertown, MD plant only.

5. Approval Notes:

a. All pre-approved precast products provided by the Approved Manufacturers listed above are itemized in the Appendix I, Precast Vault Nomenclature specific for each Manufacturer.

b. Submittal of Shop Drawings and Calculations for the pre-approved precast structures listed in the Appendices may be waived following Submittal Waiver procedure stipulated in Submittal Section 1.3 herein.

c. Structures which are not listed in the Appendices are subject for the submittal for full review and approval by WSSC Engineer(s).

D. Cleanout Boxes, for sewer service connections: Follow Standard Detail S/6.8.

1. Approved Manufacturers.

a. Atlantic Concrete Products

b. Concrete Pipe and Precast.

c. Contractors Precast Corp.

d. Horne Concrete

e. Prism Precast Products, Inc.

E. Precast Concrete Small Meter Housings:

1. Configurations:

a. 24”x24” meter housing

b. 31”x31.5” meter housing

2. Identification:

a. ASTM Designation.

b. Size.

c. Date of manufacture.

d. Contract station location and WSSC Contract number.

e. Name or trademark of manufacturer.

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f. Mark slabs on top and bottom surfaces.

3. Design Mixes:

a. 4500 psi at 28 days – refer to section 0330 for allowed cement types.

b. Mix proportion: ACI 318.

4. Approved Manufacturers:

a. Atlantic Concrete MD.

b. Contractors Precast Corp.

c. Gillespie Precast, LLC.

5. Approval notes:

a. All pre-approved precast products provided by the Approved Manufacturers listed above are itemized in the Appendix I, Precast Vault Nomenclature specific for each Manufacturer.

b. Submittal of Shop Drawings and Calculations for the pre-approved precast structures listed in the Appendices may be waived following Submittal Waiver procedure stipulated in Submittal Section 1.3 herein.

c. Structures which are not listed in the Appendices are subject for the submittal for full review and approval by WSSC.

F. Miscellaneous Materials.

1. Granular Bedding: ASTM C33 coarse aggregate size number 4.

2. Weepholes: Service weight cast iron covered with non-erodible filter on earth side.

2.2 SOURCE QUALITY CONTROL

A. Test Equipment: Instruments, gages, and other testing and measuring equipment of proper range, type, and accuracy to verify conformance with specification requirements.

1. Ensure equipment is calibrated and certified at annual intervals.

2. Calibrate against measurement standards with known relationship to existing national standards.

3. Calibrate and certify gages on equipment to which they belong and keep them on equipment following certification.

4. Do not use instruments, gages, testing, and measuring equipment found to be out of calibration or adjustment until applicable requirements have been met.

5. Calibration by agency regularly engaged in this type of activity.

B. Precast Manhole Testing.

1. Joint and Barrel Testing: ASTM C443.

a. Plant vacuum testing: ASTM C1244.

2. Pipe to Manhole Connection Testing: Flexible gasket connectors following ASTM C923, except modified herein.

a. During every 90 day period, test at least 1 connector.

b. Perform hydrostatic testing of connectors following ASTM C923.

1) If manufacturer chooses to perform vacuum test following ASTM C1244, test connector with pipe in straight alignment, 7 degrees minimum axially deflected alignment, and loaded in shear following ASTM C923.

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2) Use test pipe of same size, class, design and type as pipe to be provided under Contract.

3) Measure pressure at horizontal centerline of connector using calibrated pressure gage, minimum 4-1/2 inch diameter, calibrated from 0 to 30 psi with 1/2 pound subdivisions.

4) Manufacturer may use standpipe calibrated in 1/2 foot increments with permanent markings instead of calibrated pressure gage.

a) Use standpipe high enough to develop specified water pressure and equipped with overflow line adjusted to height for developing specified pressure.

b) Ensure that continuous stream of water flows from overflow line during test and is visible from test site.

c. Hydrostatic test at or above 40 degrees F and in environment free from effects of wind, inclement weather, and conditions that would interfere with conducting tests and observing their results.

1) Adjust test medium and specimens to, and maintain at, 40 degrees F or above prior to commencing and for duration of test.

2) Faulty performance or failure of test equipment during test phase will necessitate rerunning phase using properly performing test equipment.

d. Retesting: If connector fails to meet requirements herein and in referenced

ASTM document, Engineer will randomly select and test 2 additional connectors of same diameter and from bases originally manufactured on same day as failed connector.

1) If either of 2 additional connectors fails, Engineer will reject all bases manufactured that day with connectors of same size as those tested, as well as bases with other connector sizes mixed with original size tested.

2) Perform retest of next day's production until compliance with requirements is proven.

e. Repairs.

1) Failure of seal between connector and manhole wall due to occasional imperfections in manufacture or accidental injury during test may be repaired using methods recommended by manufacturer and on file with the Commission and will be acceptable if Engineer finds repairs are sound, properly finished, and cured.

2) Demonstrate to Engineer that repairs will result in seal conforming to requirements of this specification.

f. Post test failures: If previously tested and complying connectors resubjected to prescribed hydrostatic or vacuum pressure during testing of other sizes fail, and/or seal between them and manhole wall fails watertightness or vacuum tightness requirements, Engineer will reject base.

1) Engineer will randomly select and test 2 additional bases fitted with same size connectors originally manufactured on same date as failed base.

2) If previously tested connector sizes fail retest, all bases with same size connectors manufactured on that date will be rejected.

3) Perform retest of next day's production until compliance with requirements is proven.

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4) Perform retest of connectors that fail to meet requirements herein and in referenced ASTM document as specified in above.

5) During retesting of flexible connectors on manhole parts or joints between manhole parts, leakage of water as described in this section in any area constitutes failure requiring retest.

6) Leakage consisting of a small run adjacent to lifting inserts on manhole sections shall not be cause for rejection.

C. Acceptance Procedure for Concrete Strength of Precast Manhole Sections: Procedure applies to acceptance and approval of precast manhole bases, riser and cone sections, flat top slabs, and grade rings.

1. Concrete Design Mix Approval: Based on submittal specified above herein.

a. The Commission will issue approval for 3 years, provided design mix materials and sources are not changed and in-plant concrete testing of manhole sections continues to be accepted without rejection of more than 2 days’ production in a row.

1) Every 3 years thereafter, and under failure conditions stated above resubmit concrete design mix for approval.

2) Production from mixes other than those approved will be rejected.

b. Compressive strength test: ACI 301 and ACI 318.

D. Vaults and Other Precast Concrete Structures.

1. Determination of concrete compressive strength: From compressive tests made on concrete cylinders.

2. Unless otherwise specified, retain independent testing facility approved by Engineer for molding, capping, and testing concrete cylinders following appropriate ASTM requirements or, at Engineer's option, make cylinders and use own equipment to test.

a. Furnish test results to Engineer.

b. Engineer may require core samples of finished products.

c. When requested by Engineer, furnish compressive test specimens for testing in addition to requirements above, and continue to monitor quality of concrete.

3. Notify Engineer at least 10 working days prior to pouring any structure.

4. The Commission may perform random or full inspections of manufacture of boxes, vaults, and precast structures to inspect:

a. Steel placement and size.

b. Overall fabrication.

c. Workmanship.

d. Other general or specific aspects of production and specification compliance.

PART 3 EXECUTION

3.1 INSTALLATION

A. Execution: Follow Sections 03300, 02530, 02510 and supplemented herein.

1. Provide granular bedding following Drawings.

2. Provide weepholes on base of impervious material following Drawings.

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3. Provide bituminous membrane waterproofing following Drawings.

3.2 FIELD QUALITY ASSURANCE

A. Perform field testing of precast concrete structures required under other sections of these specifications.

PART 4 MEASUREMENT AND PAYMENT

4.1 Precast manholes, vaults, and other precast structures will be measured and paid for under other Sections of these Specifications.

**WSSC**

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APPENDIX I

Nomenclature Tables of pre-approved precast concrete vaults for the following Precast Manufacturers:

1. A. C. Miller, Spring City, PA plant only (page 1 – 2 in Appendix I).

2. Smith Midland Corp., Midland, VA plant only (page 3 in Appendix I).

3. Oldcastle Precast, Fredericksburg, VA and Edgewood, MD plants only (page

4 in Appendix I).

4. Gillespie Precast, LLC (page 5 in Appendix I).

See pre-approval conditions in Specification 3400

APPENDIX II

Nomenclature Tables of pre-approved precast concrete manholes for the following Precast Manufacturers:

1. Oldcastle Precast, Fredericksburg.

2. Gillespie Precast, LLC.

3. Concrete Pipe and Precast, Martinsburg, WV.

4. Atlantic Concrete Products Company, Cockeysville, MD plant only.

5. Contractors Precast Corporation, Davidsonville, MD plant only.

See pre-approval conditions in Specification 3400

Length(L) Widith(W) Height(H)

6'-0" X 12'-0" X 6'-6" HR PRECAST FM METER

VAULT WITH CHECK VALVE

6'-0" 12'-0" 6'-6" 10" FM Meter Vault with Check Valve

- Door for non-traffic 03400, W/5.0i

2 6'-0" X 12'-0" X 6'-6" HR PRECAST 10" FM

METER VAULT WITH CHECK VALVE ROUND

ACCESS

6'-0" 12'-0" 6'-6"

10" FM Meter Vault WITH Check Valve - Round access for traffic location

W/5.0c

6'-0" X 10'-0" X 6'-6" HR PRECAST 10" FM

METER VAULT WITHOUT CHECK VALVE

DOORS

6'-0" 10'-0" 6'-6" 10" FM Meter Vault without Check Valve - Door for non-traffic W/5.0a

6'-0" X 10'-0" X 6'-6" HR PRECAST 10" FM

METER VAULT WITHOUT CHECK VALVE

ROUND ACCESS

6'-0" 10'-0" 6'-6" 10" FM Meter Vault without Check Valve - Round access for traffic location

W/5.0a

6'-0" X 8'-0" X 6'-6" HR PRECAST 4" FM METER

VAULT WITH CHECK VALVE DOORS

6'-0" 8'-0" 6'-6" 4" FM Meter Vault with Check Valve - Door for non-traffic W/5.0b

6'-0" X 8'-0" X 6'-6" HR PRECAST 4" FM METER

VAULT WITH CHECK VALVE ROUND ACCESS

6'-0" 8'-0" 6'-6" 4" FM Meter Vault with Check Valve - Round access for traffic location W/5.0b

6'-0" X 8'-0" X 6'-6" HR PRECAST 4" FM METER

VAULT WITHOUT CHECK VALVE DOORS

6'-0" 8'-0" 6'-6" 4" FM Meter Vault without Check Valve - Door for non-traffic W/5.0a

6'-0" X 8'-0" X 6'-6" HR PRECAST 4" FM METER

VAULT WITHOUT CHECK VALVE ROUND

ACCESS

6'-0" 8'-0" 6'-6" 4" FM Meter Vault without Check Valve - Round access for traffic location

W/5.0a

6'-0" X 10'-0" X 6'-6" HR PRECAST 6" FM

METER VAULT WITH CHECK VALVE DOORS

6'-0" 10'-0" 6'-6" 6" FM Meter Vault with Check Valve - Door for non-traffic W/5.0c

6'-0" X 10'-0" X 6'-6" HR PRECAST 6" FM

METER VAULT WITH CHECK VALVE ROUND

ACCESS

6'-0" 10'-0" 6'-6" 6" FM Meter Vault WITH Check Valve

- Round access for traffic location W/5.0c

6'-0" X 8'-0" X 6'-6" HR PRECAST 6" FM METER

VAULT WITHOUT CHECK VALVE DOORS

6'-0" 8'-0" 6'-6" 6" FM Meter Vault without Check Valve - Door for non-traffic W/5.0a

No.

APPENDIX I

WSSC Water Products: Product Nomenclatuure for Precast Concrete Underground Vaults

A. C. Miller Concrete Products, INC.

Vault I.D.

Size(ft/in)

WSSC Application Specification/Current WSSC Standard Detail

Notes

1. Per WSSC Standard Specification Section 03400 PRECAST CONCRETE UNDERGROUND STRUCTURES

2. Includes all nacessary assembly items per WSSC Standard Specification Section 05500 METAL FABRICATIONS (ladders per Std. Detail M16.0/M16.1, Frames/Covers, Hatches/Doors, etc. as applicable)

03400 APPENDIX I

6'-0" X 8'-0" X 6'-6" HR PRECAST 6" FM METER

VAULT WITHOUT CHECK VALVE ROUND

ACCESS

6'-0" 8'-0" 6'-6" 6" FM Meter Vault without Check Valve - Round access for traffic location

W/5.0a

6'-0" X 10'-0" X 6'-6" HR PRECAST 8" FM

METER VAULT WITH CHECK VALVE DOORS

6'-0" 10'-0" 6'-6" 8" FM Meter Vault with Check Valve - Door for non-traffic

W/5.0c

6'-0" X 10'-0" X 6'-6" HR PRECAST 8" FM

METER VAULT WITH CHECK VALVE ROUND

ACCESS

6'-0" 10'-0" 6'-6" 8" FM Meter Vault WITH Check Valve

- Round access for traffic location W/5.0c

6'-0" X 8'-0" X 6'-6" HR PRECAST 8" FM METER

VAULT WITHOUT CHECK VALVE DOORS

6'-0" 8'-0" 6'-6" 8" FM Meter Vault without Check Valve - Door for non-traffic W/5.0a

6'-0" X 8'-0" X 6'-6" HR PRECAST 8" FM METER

VAULT WITHOUT CHECK VALVE ROUND

ACCESS

6'-0" 8'-0" 6'-6" 8" FM Meter Vault without Check Valve - Round access for traffic location

W/5.0a

APPENDIX I

WSSC Water Products: Product Nomenclatuure for Precast Concrete Underground Vaults

A. C. Miller Concrete Products, INC.

Length(L) Width(W) Height(H)

APPENDIX I

WSSC Water Products:Product Nomenclature for Precast Concrete Underground Vaults

SMITH-MIDLAND CORPORATION

Vault I.D.

Size(ft/in)

WSSC Application NotesNo.

Specification/Current WSSC

Standard Detail

APPENDIX I

WSSC Water Products:Product Nomenclature for Precast Concrete Underground Vaults

OLDCASTLE PRECAST Inc.

No. Vault I.D.

Size(ft/in)

WSSC Application Notes Specification/Current WSSC Standard Detail

1 6'x6'x6'6" HR 6'0" 6'-0" 6'-6" 6" Pressure Relief Valve Vault W 4.5 2 6'x8'x6'6" 6'0" 8'-0" 6'-6" Water Meter Vault (W5.0,a,b,c),W5.1,W12.0,W14.0

3 6'x8'x8'9" 6'0" 8'-0" 8'-9" Air Release/Vacuum - (ARV) W10.0/W10.2

4 6'x10'x6'6" 6'0" 10'-0" 6'-6" Water Meter Vault W5.0 & W14.0a

5 6'x12'x6'6" 6'0" 12'-0" 6'-6" Water Meter Vault W5.0i

6 7'x7'x8'9" 7'0" 7'-0" 8'-9" 20" Vertical Valve Vault W 2.6

7 7'x11'x8'1" HR 7'0" 11'-0" 8'-1" 16" & 20" Inch Horizontal Valve Vault W 2.4/ W2.4a

8 7'x12'x8'1" HR 7'0" 12'-0" 8'-1" 24" Horizontal Valve Vault W 2.4/W 2.4a

9 8'x10'x6'6" HR 8'0" 10'-0" 6'-6" Pressure Reducing valve Vault (PRV) W 4.2 & W 4.3

10 8'x10'x9'6" 8'0" 10'-0" 9'-6" Entry Port (EPV) W 10.3/w 10.6

11 8'6"x14'x8'1" HR 8'6" 14'-0" 8'-1" 30" Horizontal Valve Vault W 2.4/W 2.4a

12 8'6"x16'x8'1" HR 8'6" 16'-0" 8'-1" 36" Horizontal Valve Vault W 2.4/W2.4a

13 10'x18'8' 10'0" 18'-0" 8'-0" 42" Horizontal valve Vault W 2.4/W2.4a

14 10'x10'x12' 10'0" 10'-0" 12'-0" Air Release/Entry Port Vault (AR & EPV) W10.5/W10.6

15 60" DIA Xhr Varies varies 2" Air Release Manhole W2.0/S1.0/S1.1/S1.3

16 48" DIA x HR Varies varies Fire Hose Connection for Meter Vaults W5.0h

17 Hatch Riser Rings 30" 30" 6"/12" Risers for Vault Hatches W5.0e

18 30" Dia. Riser Rings 2"/6" Risers for Vault Covers W5.0e 19 48" DIA x HR Varies varies Type "A" Blowoff Water Mains 12"-30" W3.0 20 60" DIA Xhr Varies varies RISERS FOR EPV VAULT COVERS W10.3B 21 60" DIA Xhr Varies varies RISERS FOR EPV VAULT HATCHES W10.3c 22 72" DIA Xhr Varies varies RISERS FOR EPV VAULT COVERS W10.3B 23 72" DIA Xhr Varies varies RISERS FOR EPV VAULT HATCHES W10.3c

2. Includes all nacessary assembly items per WSSC Standard Specification Section 05500 METAL FABRICATIONS (ladders per Std. Detail M16.0/M16.1, Frames/Covers, Hatches/Doors, etc. as applicable)

1. Per WSSC Standard Specification Section 03400 PRECAST CONCRETE UNDERGROUND STRUCTURES

72"DIA

72"DIA

48" DIA

APPENDIX I

WSSC Water Products:Product Nomenclature for Precast Concrete Underground Vaults

GILLESPIE PRECAST LLC

60" DIA

60" DIA

Specification/Current WSSC Standard Detail

60" DIA

48" DIA

No. Vault I.D.

Size(ft/in)

WSSC Application Notes

1 48" VARIES SEWER MANHOLE S/1.0 S/1.3 S/1.4 S/2.1 S/2.2

48" DIA

1. Per WSSC Standard specification Section 03400 PRECAST CONCRETE

2. Includes all necessary assembly per WSSC Standard Section 05500 METAL FABRICATION (ladders per Std. detail M16.0 and M/16.1, Frames , Covers, Hatches, Doors, etc. as applicable)

APPENDIX II

WSSC Sewer Products: Product Nomenclature for Precast Concrete Underground Vaults

OLDCASTLE PRECAST Inc.

No. Manhole I.D.

Size(ft/in)

WSSC Application Specification/Current WSSC

Standard Detail Notes

03400 APPENDIX II

1 48" DIA x HR Varies varies SEWER MANHOLE S1.0

2 60" DIA Xhr Varies varies SEWER MANHOLE S1.1

3 72" DIA Xhr Varies varies SEWER MANHOLE S1.2

4 96" DIA Xhr Varies varies SEWER MANHOLE S1.2

48" DIA

60" DIA

72"DIA

96"DIA

APPENDIX II

WSSC Sewer Products: Product Nomenclature for Precast Concrete Underground Vaults

GILLESPIE PRECAST LLC

No. Manhole I.D.

Size(ft/in)

WSSC Application Specification/Current WSSC Standard Detail

Notes

1. Per WSSC Standard specification Section 03400 PRECAST CONCRETE

2. Includes all necessary assembly per WSSC Standard Section 05500 METAL FABRICATION (ladders per Std. detail M16.0 and M/16.1, Frames , Covers, Hatches, Doors, etc. as applicable)

1 48" Dia. Varies SEWER MANHOLE S/1.0 S/1.3 S/3.2

2 60" Dia. Varies SEWER MANHOLE S/1.1 S/1.3

3 72" Dia. Varies SEWER MANHOLE S/1.2

4 84" Dia Varies SEWER MANHOLE S/1.2

5 96" Dia. Varies SEWER MANHOLE S/1.2

48" Dia.

60" Dia.

72" Dia.

84" Dia

96" Dia.

APPENDIX II

WSSC Sewer Products: Product Nomenclature for Precast Concrete Underground Vaults

CONCRETE PIPE AND PRECAST

No. Manhole I.D.

Size(ft/in)

WSSC Application Specification/Current WSSC Standard Detail

Notes

1. Per WSSC Standard specification Section 03400 PRECAST CONCRETE

2. Includes all necessary assembly per WSSC Standard Section 05500 METAL FABRICATION (ladders per Std. detail M16.0 and M/16.1, Frames , Covers, Hatches, Doors, etc. as applicable)

2. Includes all necessary assembly per WSSC Standard Section 05500 METAL FABRICATION (ladders per Std. detail M16.0 and M/16.1, Frames , Covers, Hatches, Doors, etc. as applicable)

APPENDIX II

WSSC Sewer Products: Product Nomenclature for Precast Concrete Underground Vaults

ATLANTIC CONCRETE PRODUCTS COMPANY

No. Manhole I.D.

Size(ft/in)

WSSC Application Specification/Current WSSC Standard Detail

Notes

1. Per WSSC Standard specification Section 03400 PRECAST CONCRETE

2. Includes all necessary assembly per WSSC Standard Section 05500 METAL FABRICATION (ladders per Std. detail M16.0 and M/16.1, Frames , Covers, Hatches, Doors, etc. as applicable)

APPENDIX II

WSSC Sewer Products: Product Nomenclature for Precast Concrete Underground Vaults

CONTRACTOR PRECAST CORPORATION

No. Manhole I.D.

Size(ft/in)

WSSC Application Specification/Current WSSC Standard Detail

Notes

1. Per WSSC Standard specification Section 03400 PRECAST CONCRETE