Sanitary Sewer Systems

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(Section 02730)

PART 1 GENERAL

1.01 WORK INCLUDED

A. Contractor shall provide all materials, labor, equipment, transportation and other items required to furnish and install sanitary sewer systems as indicated on the drawings, as required by applicable codes and regulations, and as specified herein.

B. Sanitary sewer systems shall include but not be limited to the following:

     1. Sewer piping, manholes, and service laterals.

     2. Connections with existing sewerage facilities.

     3. Cleaning, flushing, and testing sewerage facilities.

     4. Valves and appurtenances

1.02 RELATED WORK

A. Section 02220 - Excavating, Backfilling, and Compaction

     1. Trench excavation, overexcavation of unsuitable materials, backfill placement and compaction associated with installation of items specified as part of this Work.

B. Section 02590 - Restoration of Existing Improvements

     1. Repairs and restoration of existing underground, surface or above ground improvements disturbed or damaged as part of this Work.

C. Section 03000 - Concrete

     1. Construction of concrete structures associated with or required as part of this Work.

1.03 REFERENCES

A. The applicable provisions of the latest editions of the References listed below shall govern the Work covered under this Section, unless there is a conflict between said References and the requirements of this Section. In the case of such a conflict, the requirements of this Section shall apply.

B. American Society for Testing and Materials (ASTM)

C. American National Standards Institute (ANSI)

D. Uni-Bell PVC Pipe Association - Handbook of PVC Pipe

E. Ductile Iron Pipe Research Institute (DIPRA)

F. American Association of Safety and Highway Transportation Officials (AASHTO)

G. Utah Department of Transportation Construction Standards (UDOT)

H. Midvale City Corporation Standard Construction Details

I. Concrete Reinforcing Steel Institute (CRSI)

1.04 SUBMITTALS

A. Submit shop drawings, manufacturer's literature, certifications, and other product data in accordance with other sections and as specified herein.

B. Submittal data shall include, but not necessarily be limited to the following:

     1. Manufacturer's recommended transportation, unloading and storage requirements. Manufacturer's installation guides and instructions.

     2. Evidence of conformance with the requirements of these specifications.

     3. Dimensional information for structures, castings, and fittings.

C. Contractor shall maintain accurate construction record drawings of all as-built invert elevations, manhole locations, pipe lengths, and wye locations and shall submit these records to the Engineer for approval prior to application for final completion.

1.05 QUALITY ASSURANCE

A. Transportation, handling, storage and installation practices shall be in accordance with manufacturer's recommended practice for materials provided as part of this Work.

B. Contractor's personnel shall be experienced in the installation of materials provided as part of the Work, and shall comply with manufacturer's recommended practices during handling, placement and installation of such materials.

1.06 DELIVERY AND HANDLING

A. Contractor shall be responsible for proper transportation, unloading, handling, storage and security of all equipment and materials to be provided as part of this specification in accordance with manufacturer's recommendations.

B. Materials shall be stored in such a manner as to prevent damage or degradation. Any materials damaged prior to installation shall be removed from the project and replaced

with new materials at no additional cost. Lost or stolen materials shall be replaced at no additional cost.

1.07 PROJECT CONDITIONS

Not Used

PART 2 PRODUCTS

2.01 MANUFACTURERS

A. Manufacturers providing materials or equipment as part of this specification shall have a minimum of five (5) years experience in the manufacture, testing, and installation of such materials and equipment.

B. Manufacturers shall provide, upon request, verification of a consistent record of meeting or exceeding materials or performance standards as specified herein.

C. Allowable Manufacturers - Subject to compliance with specified requirements, manufacturers offering products that may be incorporated in the Work include, but are not limited to the following:

     1. Sanitary Sewer Piping

         a. Polyvinyl Chloride (PVC)
               i. J - M Manufacturing Company, Livingston, New Jersey
               ii. Extrusion Technologies, Incorporated, Denver, Colorado
               iii. Pacific Western Extruded Plastics Company, Eugene, Oregon

         b. Ductile Iron (DIP)
               i. Pacific States Cast Iron Pipe Company, Provo, Utah
               ii. United States Pipe and Foundry Company, Birmingham, Alabama
               iii. Tyler Pipe, Tyler, Texas (Fittings Only)

          c. Vitrified Clay (VCP)
               i. Gladding, McBean and Company, Salt Lake City, Utah

          d. Reinforced/Unreinforced Concrete Pipe (RCP and UCP)
               i. W.R. White Company, Ogden, Utah
               ii. Amcor Precast, Ogden, Utah
               iii. Geneva Pipe, Orem, Utah

     2. Sanitary Sewer Manholes (Precast)

          a. W. R. White Company, Ogden, Utah

          b. Amcor Precast, Ogden, Utah

          c. Geneva Pipe, Orem, Utah
 

     3. Sewer Lateral Stubs

          a. Pipe and fittings shall be of same manufacturer as main piping.

          b. Adaptors shall be Fernco or Romac.

     4. Valves and Appurtenances

          a. Gate Valves
               i. Super-Seal, Mueller Company, Decatur, Illinois
               ii. AWWA R/W, Clow/McWane Incorporated, Birmingham, Alabama

          b. Eccentric Plug Valves
               i. Ful-Flo, Clow/McWane Incorporated, Birmingham, Alabama
               ii. DeZurik - General Signal, Sartell, Minnesota

          c. Check Valves
               i. Mueller Company, Decatur, Illinois
               ii. List 115, Clow/McWane Incorporated, Birmingham, Alabama

          d. Air/Vacuum Release Valves
               i. Crispin Multiplex Manufacturing Company, Berwick, Pennsylvania
               ii. G A Industries, Mars, Pennsylvania
               iii. APCO Willamette Valve and Primer Corporation, San Clemente, California

2.02 SANITARY SEWER PIPING

A. Sanitary sewer piping shall be of the size, type, and class specified on the drawings and as specified herein.

B. Polyvinyl Chloride (PVC) Pipe

     1. Unless otherwise indicated, PVC pipe shall be SDR 35 designed and manufactured in accordance with ASTM D-3034 for pipes sizes 4" to 15" and ASTM F-679 for pipe sizes 18" to 27".

     2. Pipe shall be bell and spigot type consisting of integral bell section, factory beveled spigot ends, and securely attached rubber sealing ring conforming to the requirements of ASTM D-3212.

     3. Piping shall be green pigmented.

     4. Fittings shall conform to the requirements of ASTM D-3034 (4" to 15") and shall be provided with joints conforming to ASTM D-3212.

C. Ductile Iron Pipe (DIP)

     1. Unless otherwise indicated, DIP pipe shall be cement mortar lined Class 50 designed and manufactured in accordance with ANSI/AWWA C150/A21.50, C151/A21.51 and C104/A21.4.

     2. Pipe shall generally be bell and spigot type consisting of integral bell section, factory beveled spigot ends, and rubber sealing ring conforming to the requirements of ANSI/AWWA C111/A21.11.

     3. Fittings shall conform to the requirements of ANSI/AWWA C153/A21.53.

D. Vitrified Clay Pipe (VCP)

     1. Unless otherwise indicated, vitrified clay pipe shall be push-on joint type, extra strength class conforming to the requirements of ASTM C-700.

     2. Push on joints and gaskets shall conform to the requirements of ASTM C-425.

     3. Fittings shall be vitrified clay, extra strength conforming to the requirements of ASTM C-700.

E. Reinforced Concrete Pipe (RCP) (12" Diameter and Larger)

     1. Reinforced Concrete Pipe (RCP) shall meet the requirements of ASTM C76 - Standard Specification for Reinforced Concrete Culvert, Storm Drain and Sewer Pipe, Class III.

     2. Push-on gasket joints shall conform to ASTM C443 - Standard Specification for Joints for Circular Concrete Sewer and Culvert Pipe, Using Rubber Gaskets.

     3. Cement for the pipe shall be Portland Cement Type V, conforming to ASTM C150.

F. Unreinforced Concrete Pipe (UCP) (Less than 12" Diameter)

     1. Concrete pipe shall meet the requirements of ASTM C14 - Standard Specification for Concrete Sewer, Storm Drain, and Culvert Pipe, Class III.

     2. Push-on gasket joints shall conform to ASTM C443.

     3. Cement for the pipe shall be Portland Cement, Type V, complying to ASTM C150.

2.03 SANITARY SEWER MANHOLES

A. Manholes shall be either cast in place or precast units of the size, depth and configuration indicated on the drawings.

B. Precast concrete manhole sections shall be designed and manufactured in accordance with the requirements of ASTM C-478.

C. Manhole rings and flat top sections shall be designed and manufactured in accordance with the requirements of ASTM C-478 and AASHTO HS-20 loading.
 

D. Manholes shall be of watertight construction, utilizing either bitumastic sealant or rubber gasket between adjacent manhole sections.

E. Cement for manholes shall be Portland Cement, Type V, or Type II-A complying with ASTM C 150.

F. All required openings in manhole sections shall be preformed during the casting process at proper locations required for indicated installation. Each opening shall be provided with a watertight rubber boot equipped with stainless steel bands to secure boot to both manhole and pipe connection.

G. Manhole ring and cover shall be manufactured of grey iron castings conforming to ASTM A 48, Class 30, with non rocking, machined bearing surfaces between cover and frame.

     1. Cover shall be non vented and shall bear the lettering "SEWER".

     2. Ring and cover shall weigh not less than 350 pounds.

H. Manhole steps, if required, shall be cast in place units consisting of steel rebar construction covered with polyvinyl material and specifically manufactured for use in manhole installation.

2.04 SEWER LATERAL STUBS

A. Sewer laterals, unless otherwise noted, shall consist of service wye, lateral pipe, plug, and cleanout as indicated on the drawings.

B. Service wye shall comply with the requirements of local jurisdiction.

C. Service laterals shall consist of 45 wye, bends, tees and other fittings conforming to ASTM D-3034 and D-3212, and PVC lateral piping conforming to ASTM D-3034.

D. Provide approved 'Fernco' or other fittings for connections to existing services where required.

2.05 VALVES AND APPURTENANCES

A. Gate valves shall be resilient seat non-rising stem valves meeting the following requirements:

     1. Meets or exceeds ANSI/AWWA C509.

     2. Interior and exterior surfaces epoxy coated in accordance with ANSI/AWWA C550.

B. Eccentric plug valves shall meet the following requirements:

     1. Shall provide 100% clear opening when opened.

     2. Plugs shall be cast iron encapsulated with Buna-N rubber.

     3. Valve shall be provided with stainless steel seats and thrust collar.

C. Check valves shall be swing type meeting the following requirements:

     1. Meets or exceeds requirements of ANSI/AWWA C508.

     2. Sizes up to 12" shall be designed for 175 psi. working pressure. Larger sizes shall be designed for minimum 150 psi. working pressure.

     3. Iron body, bronze mounted, with rubber faced disc.

D. Sewer air release valves shall meet the following requirements:

     1. Iron body, with stainless steel internal mechanisms and Buna-N seat.

     2. Shall be provided with brass inlet gate valve to allow isolation of unit, and shall be provided with backflush ports, valves and hose assembly.

     3. Shall be designed for a maximum operating pressure of 300 psi.

PART 3 EXECUTION

3.01 EXAMINATION

A. Verify installation or connection requirements prior to construction by potholing as necessary.

B. Verify that Work covered under other sections of these specifications is complete to the point that Work covered under this section may properly commence without hindering or damaging Work of other trades. Do not proceed with construction until unsatisfactory conditions have been corrected.

3.02 METHODS AND PROCEDURES

A. Install materials and equipment included in the Work in accordance with materials/equipment manufacturer's recommended methods and procedures.

3.03 INSTALLATION

A. General

     1. Install sewer piping to the lines, grades, and elevations indicated on the drawings. Install service wyes at the locations indicate or as otherwise required to provide service connections to existing services.

 

B. Bedding:

     1. Bedding shall be prepared in accordance with Section 02220 of these specifications and as indicated on the drawings.

     2. Overexcavate as necessary and install approved material to provide firm, stable foundation for sewer piping installation. Overexcavation shall be approved by Engineer.

     3. Prepare bedding to insure trench bottom is free of large stones, debris, frozen, organic or other deleterious materials.

     4. Excavate to pipe bells to insure pipe is supported properly along its entire length.

C. Pipe Laying Procedures

     1. Dewater trench as necessary to prevent the accumulation of groundwater or other unacceptable water in trench.

     2. Pipe laying operations shall proceed in a uphill direction with all bell facing uphill unless otherwise specifically approved by Engineer.

     3. Contractor shall follow pipe manufacturer's recommended practice for lowering, assembling, and installing sewer pipe.

     4. During pipe installation, verify that no foreign material is inside pipe. Clean interior of each pipe joint prior to installation.

     5. Sewer pipe shall be laid to uniform line and grade between manholes unless otherwise approved by the Engineer.

     6. Plug open end of installed sewer piping and close trench at the end of each day's work. Open trenches may not be left overnight without specific permission from the Engineer.

D. Water main crossing requirements:

     1. Maintain 18" vertical separation wherever possible.

     2. Sewer mains shall be installed beneath water mains wherever possible.

     3. If vertical separation or installation beneath water main requirement can not be met, provide ductile iron sewer piping for a distance of not less than 10 feet on either side of the crossing. Pipe joints shall be located to provide maximum distance from water mains. Advise Engineer of vertical separation less than 18" and receive approval of corrective measures prior to proceeding with sewer main installation.

     4. If 12" vertical separation can not be provided, encase sewer main in concrete for a distance of not less that 10 feet on either side of crossing.

E. Horizontal separation requirements.

     1. Maintain a minimum 10' horizontal separation between sewer main and existing water mains wherever possible.

     2. Provide ductile iron sewer piping for sections where 10' horizontal separation is not possible. Advise Engineer of horizontal separation less that 10' and receive approval of corrective measures prior to proceeding with sewer main installation.

F. Backfilling

     1. Install backfill and compact in accordance with manufacturer's requirements and as indicated on the drawings. Backfill shall not be placed in lifts greater than can be properly compacted to the required density.

     2. Backfill material shall be free of large rocks, organic or frozen material.

G. Manholes

     1. Excavation, bedding and backfill for manhole installation shall be in accordance with Section 02220 of these specifications and as indicated on the drawings.

     2. Install manholes at locations and to grades indicated on the drawings.

          i. Installation shall be in accordance with ASTM C891 - Standard Practice for Installation of Underground Precast Concrete Utility Structures.

     3. Set manhole lid flush with finished surface unless otherwise noted on the drawings.

     4. Cast-in-place base and floor shall conform with requirements of standard details for layout and configuration.

     5. All lifting holes shall be grouted watertight.

     6. Prevent debris from entering installed sewer main piping via manholes by providing suitable barriers or covers.

     7. Pipe transition into manhole must be smooth and free of any pockets or indentations. Any such inconsistencies shall be filled with non-shrink grout to form a smooth surface.

 

3.04 PROTECTION

A. Provide barricades and restrict access as appropriate to prevent damage to Work in place.

B. Contractor shall be responsible for protection of Work in place against displacement, damage, loss or theft until Owner's acceptance. Any Work installed and subsequently damaged, lost, or displaced shall be repaired or replaced to the Owner's satisfaction at no additional cost.

3.05 CLEANING

A. Thoroughly clean all pipe lengths or units of all debris immediately after laying.

B. Thoroughly clean by flushing and remove all debris from sewer mains and manholes. Inspect and clean all lines as specified herein. Sewerage facilities shall be thoroughly cleaned prior to turning over to the Owner.

3.06 TESTING

A. Contractor shall provide all materials, equipment, and labor to perform testing of installed sewer main piping, services, and manholes as required for acceptance by Engineer.

B. Engineer shall be notified no less than two full working days prior to any proposed testing.

C. The sewer main shall be tested after placement of pipe zone material but before final backfill and surfacing.

D. Testing of sewer mains shall consist of the following.

     1. Engineer, Owner or their representative shall visually inspect each run of piping by lamping to verify consistent line and grade.

     2. Mandrel testing

          a. Mandrel (deflection testing) shall be conducted no sooner that 30 days after pipe is backfilled.

          b. Mandrel shall be manufactured to provide proofing ring and minimum 9-point bearing with an outside diameter of 95% of the average inside diameter of line to be tested. Contractor shall provide certifications that mandrel meets these requirements prior to testing.

          c. Mandrel shall be pulled by hand in the presence of the Engineer and shall pass freely through the line being tested.

          d. In the event the mandrel cannot pass freely through the line, pipe shall be excavated, rebedded and backfilled to reduce pipe deflection below 5%. All costs for excavation, rebedding, and repair of deflected pipe shall be borne by Contractor.

          e. Contractor shall reperform mandrel test and make repairs until acceptable deflection results.

     3. Low pressure air testing.

          a. Plug each end of pipe to be tested with suitable test plugs and brace each plug securely. Plugs shall be equipped with pressure release devices set to a maximum of 6 psi.

          b. Locate all gauges, manifolds and valves on outside of manhole. No personnel shall be allowed to enter manhole during testing procedure.

          c. Slowly increase pressure in line to be tested to 4.0 psi above external hydrostatic pressure on piping.

          d. Allow internal pressure to stabilize for two (2) minutes, adding air as necessary to maintain 4.0 psi.

          e. Disconnect air supply and allow line pressure to drop to 3.5 psi, where upon test interval is started.

          f. Determine time interval from beginning of test until line pressure drops to 2.5 psi.

          g. Refer to allowable time interval table included in this section of these specifications for the line size tested. If time interval exceeds minimum allowable time, line segment shall be considered as passing low pressure air test.

E. In the event that line fails testing, Contractor shall make all required repairs, replacements, or other measures necessary to pass required acceptance tests. All costs
for repair, replacement, and retesting to verify acceptability of installed work shall be borne by the Contractor at no additional cost to the Owner.

F. If the above minimum specifications cannot be met after all sources of air leakage have been corrected, a water exfiltration test may be conducted with Engineer's approval to determine the acceptability of the test section.

     1. Exfiltration Tests: The length of pipe tested shall be limited so that the pressure on the invert of the lower end of the section tested shall not exceed 16 feet of water column, and in no case shall the length of the section tested be greater than 400 feet or the distance between manholes, whichever is less.

     2. Allowable Leakage: The measured rate of leakage during the test shall not exceed 200 gallons per inch of pipe diameter per mile of pipe per 24 hours, with a 6 foot head at the crown at the upper end of the test section.

G. Manhole Testing

     1. Sewer manholes shall be tested in accordance with ASTM C1244 - Standard Test Method for Concrete Sewer Manholes by the Negative Air Pressure (Vacuum) Test.

     2. Contractor shall provide suitable test head, pipe plugs and related equipment as required for manhole testing.

     3. Procedure

          a. Place test head on manhole top in accordance with test head manufacturer's recommendations.

          b. Apply vacuum to 10 in. of mercury. Close valve to vacuum pump. Shut off vacuum pump.

          c. Determine time required for vacuum reading to drop from 10 in. to 9 in. Manhole shall pass if time required meets or exceeds values indicated in the following table.

Table 1 - Manhole Vacuum Test Requirements

Depth (ft)

36" Diameter

48" Diameter

60" Diameter

72" Diameter

8

14 sec

20 sec

26 sec

33 sec

10

18 sec

25 sec

33 sec

41 sec

12

21 sec

30 sec

39 sec

49 sec

14

25 sec

35 sec

46 sec

57 sec

16

29 sec

40 sec

52 sec

57 sec

18

21 sec

45 sec

59 sec

67 sec

TIME HOLDING CHART

Time in Seconds Required For Pressure Drop From 3.5 to 2.5 psig
Dry Pipe Test Standard (Based on 0.005 cfm/sf and 2.0 cfm)

Pipe Diameter in Inches

Len

4"

6"

8"

10"

12"

15"

18"

21"

24"

27"

30"

33"

36"

25

3

6

10

16

23

36

51

73

95

120

149

179

214

50

5

1

20

32

46

71

102

146

190

241

297

359

428

75

8

17

30

47

69

106

153

218

285

361

446

539

612

100

10

23

41

64

91

142

204

291

383

459

511

561

 

125

13

29

51

79

114

177

255

357

408

 

 

 

 

150

15

34

61

95

137

212

306

 

 

 

 

 

 

175

18

40

71

111

160

255

 

 

 

 

 

 

 

200

20

46

81

127

188

 

 

 

 

 

 

 

 

225

23

51

91

143

204

 

 

 

 

 

 

 

 

250

25

57

102

159

 

 

 

 

 

 

 

 

 

275

28

63

112

174

 

 

 

 

 

 

 

 

 

300

31

69

122

 

 

 

 

 

 

 

 

 

 

350

36

81

142

 

 

 

 

 

 

 

 

 

 

450

46

103

 

 

 

 

 

 

 

 

 

 

 

500

51

 

 

 

 

 

 

 

 

 

 

 

 

550

56

 

 

 

 

 

 

 

 

 

 

 

 

600

61

103

142

174

204

255

306

357

408

459

511

561

612


TIME HOLDING CHART

Time in Seconds Required For Pressure Drop From 3.5 to 2.5 psig
Wet Pipe Test Standard (Based on 0.003 cfm per sq. ft. and 2.0 cfm)

Pipe Diameter in Inches

Len

4"

6"

8"

10"

12"

15"

18"

21"

24"

27"

30"

33"

36"

25

4

10

18

28

40

62

89

121

158

200

248

299

356

50

9

20

35

55

79

124

178

243

317

401

495

599

713

75

13

30

53

83

119

186

267

364

475

601

743

898

1020

100

18

40

71

110

158

248

356

485

639

765

851

935

 

125

22

50

88

138

198

309

446

595

680

 

 

 

 

150

26

59

106

165

238

371

510

 

 

 

 

 

 

175

31

69

123

93

277

425

 

 

 

 

 

 

 

200

35

79

141

220

317

 

 

 

 

 

 

 

 

225

40

89

158

248

340

 

 

 

 

 

 

 

 

250

44

99

176

275

 

 

 

 

 

 

 

 

 

275

48

109

194

283

 

 

 

 

 

 

 

 

 

300

53

119

211

 

 

 

 

 

 

 

 

 

 

350

62

139

227

 

 

 

 

 

 

 

 

 

 

400

70

158

 

 

 

 

 

 

 

 

 

 

 

450

79

170

 

 

 

 

 

 

 

 

 

 

 

500

88

 

 

 

 

 

 

 

 

 

 

 

 

550

97

 

 

 

 

 

 

 

 

 

 

 

 

600

106

 

 

 

 

 

 

 

 

 

 

 

 

650

113

170

227

283

340

425

510

595

680

765

851

935

1020
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