November 24, 2017

Division Three - Standards for Sanitary Sewers - Chapter IV. Materials and Installation

Chapter IV. Materials and Installation

Sec. 304-1 General

All material that is to become a permanent part of any sanitary sewer or appurtenant structure, shall conform to the requirements for the particular material as set forth in these specifications. The contractor shall supply any and all certificates of compliance, certified tests results or shall perform tests as required to assure the Engineer that the material being incorporated into the work has met the requirements as specified. Requests to use materials not listed in these standards shall require special consideration and approval of the Director.

Sec. 304-2 Pipe and Conduits

All pipe or conduits shall be of the size, material and strength as shown on the plans. All pipe and fittings shall be marked or stamped with the trade brand name of the manufacturer, and strength or class of pipe. All pipe shall be designed to withstand all internal or external loads applied. Supporting strength of conduits as installed to safely carry imposed gravity loads and superimposed loads (including a suitable factor of safety) shall be determined by use of Marston formula as per Chapter 9 (Structural Requirements) ASCE Manual of Engineering Practices No. 60 (Copy on file with Director). All pipe or conduits shall be of the same material between structures.

Sec. 304-3 Vitrified Clay Pipe (VCP)

Vitrified Clay Pipe (VCP) and fittings shall be new, first quality pipe and shall comply with the specifications for Extra Strength Unglazed Clay Pipe ASTM Designation: C-700. Joints for bell and spigot VCP shall conform to ASTM Designation: C-425. Installation of VCP shall comply with ATSM Designation: C-12. The only allowable variations from the above recommended practices will be as definitely specified in other sections of these standards.

  1. Materials: The pipe and fittings shall be extra strength vitrified clay conforming to current ASTM designation C-700, and shall be installed in conformance with the provisions of section 71 of the standard specifications of the State of California, Department of Transportation, current edition and the current ASTM designation C-12.
  2. Joints:

(1) Joints for bell and spigot VCP shall conform to ASTM Designation: C-425. The pipe and fittings shall have a socket end and a spigot end with compression joints conforming with the current ASTM designation C-425.

(2) The pipe and fitting for 6”, 8”, 10” and 12” sanitary sewer mains may be plain-end with compression couplings conforming with the current ASTM designation C-425, excepting that a stainless steel shear ring as manufactured by Mission Clay Products Corporation for their “Mainline” band seal compression coupling, or approved equal, shall be required.

(3) The pipe and fittings for private sanitary house sewer or building laterals may be plain-end with compression or coupling conforming with the current ASTM designation C425, (stainless steel shear rings are not required. The only allowable variations from the above recommended practices will be as definitely specified in other sections of these standards. 

The use of VCP shall be at the discretion of the District.

Sec. 304-4 Intentionally left blank

Sec. 304-5 PVC, ABS, and PVC Truss Pipes

P.W. Pipe Twin Seal or J-M Ring Tite PVC or Armco ABS or PVC Truss pipe sewer installations. Except for procedures involving the use of the above pipes as detailed herein, the requirements of Section 71 of the Standard Specifications and the required Mandrell Test and Air Pressure Test upon completion of compaction of the trench backfill and subgrade grading plane are applicable. ASTM specifications referred to herein shall be the latest edition thereof.

304-5.01 P.V.C. Sewer Pipe shall conform to the following:

    1. Pipe shall conform to ASTM-D-3034 in accordance with SDR-35 (1.4.2.3 D2680 and D2751) requirements.
      1. Pipe and fittings shall be homogeneous throughout and free from cracks, holes, foreign inclusions or other defects. Fitting shall be injection molded and shall be installed in line on new pipelines; cut-in fittings are not permitted.
      2. Joints: Use only elastomeric gasket joints. The assembly of joints shall be in accordance with the manufacturer’s recommendation. Where PVC pipe connects to VCP, use couplings approved by the County and District.
      3. Joints: Use only solvent welded joints. The assembly of Joints shall be in accordance with the manufacturer’s recommendations. Where ABS pipe connects to VCP, use couplings approved by the County and District.
    1. Pipe and fittings shall be made from PVC having a minimum cell classification of 12454-B, 12454-C or 13364-B, as defined by ASTM-D-1784.
    2. Pipe stiffness shall be 46 psi minimum when measured in accordance with ASTM-D-2412.
    3. P.V.C. compound used shall not contain filler material in excess of 10 pph.

304-5.02 Parallel Rib Sewer Pipe shall conform to the following:

(Only approved for use by limited districts in the County)

    1. Pipe shall conform to ASTM-F-949 for 4", 6", or 8" diameter pipe.
    2. Pipe and fittings shall be made from PVC having a minimum cell classifications of 12454B or 12454C as defined by ASTMD-1784.
    3. Pipe stiffness shall be 50 psi minimum when measured in accordance with ASTM-D-2412.142
    4. The PVC compound used for ASTM-F-949 pipe manufacture shall not contain filler material in excess of 5 pph.

304-5.03 ABS or PVC Truss Pipe shall conform to the following:

(Only approved for use by limited districts in the County)

    1. Pipe shall conform to ASTM-D02680 in accordance with SDR-23.5 requirements.
    2. Pipe shall be made from ABS or PVC having a minimum cell classification of 12454-B or 12454-C, as defined by ASTM D-1784 or classification of 2-2-3 as defined by ASTMD-1788.
    3. Pipe, glue and fittings shall conform to ASTM designations D-3189, and F-402, D-1084, D-2234, and D-1788.
    4. Fittings shall be made from PVC having a minimum cell classification of 12454B, 12454C or 13343C as defined by ASTM-D-1784.
    5. Each length of pipe shall be marked with the applicable ASTM, SDR (if applicable), cell classification, nominal pipe size and manufacturers name or trademark.
    6. A certificate of compliance from the pipe manufacturer shall be provided for each type of material used.

304-5.04 PVC Pipe and Fittings

All PVC pipe and fittings shall conform to the following:

    1. Each length of pipe shall be marked with the applicable ASTM, SDR (if applicable), cell classification, nominal pipe size and manufacturers name or trademark.
    2. A certificate of compliance from the pipe manufacturer shall be provided for each type of material used.
    3. PVC pipe shall not deviate from straight by more than 1/16th inch per foot (camber) when the maximum offset is measured from the concave side of the pipe. ABS or PVC pipe shall be of the bell and spigot type. Bells shall be factory attached to the pipe. Wyes or tees for house service connections shall be complete fittings. Saddle type fittings shall not be allowed. Field solvent welded joints shall not be allowed.

304-5.05 Storage and Handling of PVC, ABS, and PVC Truss Pipes.

Pipes shall be stored on a smooth bed. The pipe shall not be dropped or dragged. Stored pipe shall be covered to protect it from ultraviolet light (sun's rays). Pipe with noticeable color changes resulting from exposure to ultraviolet light shall be rejected by the Engineer.

304-5.06 Bedding for PVC ABS, and PVC Truss Pipes

Embedment materials (Class I, II and III) shall conform to Paragraphs 6.1.1, 6.1.2 and 6.1.3, ASTM D-2321 which reads as follows:

    1. Class I - Angular, 1/4 to 1-1/2 in. graded stone, including a number of fill materials that have regional significance such as coral, slag, cinders, crushed stone, crushed gravel, and crushed shells.
    2. Class II - Coarse sands and gravels with maximum particle size of 1-1/2 in., including variously graded sands and gravels containing small percentages of fines, generally granular and non-cohesive, either wet or dry. Soil types GW, GP, SW, and SP are included in this class.
    3. Class III - Fine sand and clayey gravels, including fine sands, sand-clay mixtures, and gravel-clay mixtures. Soil types GM, GC, SM and SC are included in this class.
    4. Soil classification is in conformance with Unified Soil Classification System ASTM Designation D-2487 and D-2488. Native soils meeting the requirements for Class II and Class III materials may be accepted by the Engineer.
    5. Bedding procedure shall conform to Paragraphs 8.1.1, 8.1.2, and 8.1.3 of ASTM-D02321 and the following:
      1. Bedding shall be placed and compacted for all main lines and building sewer laterals as shown on plate S-1.
      2. After placement and compaction of bedding and prior to installation of sewer main and laterals the Engineer shall inspect the bedding placement and compaction.144
      3. Flooding or jetting of bedding will not be allowed.

304-5.07 Installation of Pipe, Fittings and Haunching PVC, ABS, and PVC Truss Pipes

    1. Pipe exposed to the sun during summer months shall be allowed to cool prior to connection to manholes or placement of haunching. Allowance shall be made for the movement of pipe along the main line and at the building sewer laterals. Fittings shall be sized to receive type of pipe used. Installation of fittings shall be in accordance with manufacturer's instruction manuals. Plugs shall be placed at the termination of the building sewer laterals and main line (if required).
    2. A flexible coupling, Fernco Series #1056 or Mission Rubber Band Seal or a flexible joint, shall be installed within three feet of each sewer manhole. Where bands are tied to secure flexible couplings, the bands, housing, and screw shall be stainless steel.
    3. Pipe installation and haunching shall conform to Paragraphs 9.1.1, 9.1.2 and 9.1.3 of ASTM-D-2321 and the following:
      1. The pipe shall be laid true to grade with 0.03' maximum tolerance, per joint.
      2. After cooling of the pipe, haunching shall be placed and compacted for all main lines and building sewer laterals as shown on Plate S-1.
      3. Materials used for haunching shall be the same class as that used for bedding.
      4. Prior to placement and compaction of initial backfill, the Engineer shall inspect the placement of sewer main and house building sewers, haunching and compaction.
      5. Care shall be exercised in placing haunching material to prevent damage to or displacement of the sewer pipe.
      6. Flooding or jetting the haunching will not be allowed.

304-5.08 Initial Backfill PVC, ABS and PVC Truss Pipes

Initial backfill shall conform to Paragraphs 9.1.1, 9.1.2 and 9.1.3 of ASTM-D-2321 and the following:

    1. After cooling of the pipe and placement and inspection of haunching, initial backfill shall be placed and compacted for all main lines and building sewer laterals as shown on Plate S-1.
    2. Materials used for initial backfill shall be the same class as that used for haunching.
    3. Prior to placement and compaction of backfill, the Engineer shall inspect the initial backfill and compaction.
    4. Care shall be exercised in placing initial backfill material to prevent damage to or displacement of the sewer pipe.
    5. Flooding or jetting the initial backfill will not be allowed.

304-5.09 Backfill PVC, ABS and PVC Truss Pipes

PIPE ZONE MATERIAL

Rigid Pipe

All material passing 1” sieve

Flexible Pipe

ASTM D2321 Class I, II or III (Classes I and II allow up to 1 ½“ rock)

Compaction

90% (ASTM D2321 only requires 85% for Class II material

TRENCH WIDTH

Pipe Size (in.) O.D. (in.)* Max. (O.D.+16”) Min. (O.D.+10”)
4 4.215 20.2 14.2
6 6.275 22.3 16.3
8 8.400 24.4  18.4
10 10.500 26.5 20.5
12 12.500 28.5 22.5
15 15.300 31.3 25.3
18 18.701 34.7 28.7
21 22.047 38.0 32.0
24 24.800 40.8 34.8 
27 27.950 44.0 38.0

* O.D. may vary from type and/or manufacturer of pipe.

The remainder of the trench backfill shall conform with Section 19-3 of the Standard Specifications and as follows:

    1. Section 19-3.062, "Slurry Cement Backfill", of the Standard Specifications is deleted.
    2. Backfill material shall be free of all rock or lumps, exceeding six (6) inches maximum dimension.
    3. Compaction of backfill material shall be required for all main lines and building sewer laterals as shown on the attached Plate S-1.
    4. Flooding or jetting of the backfill will not be allowed.

304-5.10 Sewer Pipes

After pipeline cleaning, backfill and compaction of trench and subgrade grading plane compaction, the completed sewer main shall be air tested in conformance with Section 303-2 of the Kern County Development Standards.

    1. Lateral and Stubs
      1. All laterals shall extend to the property line and shall be 4” in diameter except as noted on plans. Surface markers for sewer laterals shall be installed at property line.
      2. Wye fittings shall be in-line type and shall be used for all lateral connections and shall be rotated a minimum of 23 degrees above the horizontal plane running through the centerline of the main.
      3. All sewer stubs shall be closed with a standard plastic plug solvent welded.
    2. Existing Facilities: All existing improvements, (curbs, gutter, sidewalk, cross gutter, fencing, etc.), that are removed, damaged or undercut shall be repaired or replaced as directed by the County.

Location

Public Services Building
2700 M Street, Suite 570
Bakersfield, CA 93301-2370
map 

Phone: 661-862-5100 
FAX: 661-862-5101 
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