Napa County Municipal Code Ch. 13.36 Construction Materials and Specifications

A. The building sewer, beginning two feet (0.6m) from any building or structure, shall be of such materials as may be approved by the administrative authority under the approval procedures set forth in Chapter 3 of that edition of the California Plumbing Code adopted by this code (CPC § 715.1, modified).

B. Joining methods and materials shall be as prescribed in Sections 705.1.1 and 316.0 of the CPC (CPC § 715.2).

C. Notwithstanding any other provision of this code, within the boundaries of the Lake Berryessa Resort Improvement District and the Napa Berryessa Resort Improvement District, any building sewer, beginning two feet outside any building or structure, shall be subject to the review and inspection of the Department of Public Works pursuant to the procedures and standards adopted in each district by the board of directors of that district. Each district may charge for such inspection services that fee established by resolution or ordinance of the board of directors of that district (CPC Appendix Chapter 1, § 103.5.1, modified).

(Ord. No. 1337, § 21, 5-5-2010; Ord. 1109 § 1 (part), 1996: Ord. 1028 § 2, 1992; prior code § 5520)

All pipe, brick, prefabricated septic tanks, prefabricated septic tank covers or other parts or appurtenances incidental to the installation of building sewers or individual or private sewage disposal systems shall conform to the requirements of Chapter 3 of that edition of the California Plumbing Code adopted by this code, and shall be marked and identified in a manner satisfactory to the administrative authority (CPC § 716.0).

(Ord. 1109 § 1 (part), 1996: prior code § 5521)

The minimum size of any building sewer or private sewer may be determined on the basis of the total number of fixture units drained by such sewer, in accordance with Table 7-8 of that edition of the California Plumbing Code adopted by this code (CPC § 717.0, modified).

(Ord. 1109 § 1 (part), 1996: prior code § 5522)

Building sewers shall be run in practical alignment and at a uniform slope of not less than one-fourth of an inch per foot (20.9mm per m) toward the point of disposal.

Exception: When approved by the administrative authority and where it is impractical due to the depth of the street sewer or to the structural features or to the arrangement of any building or structure to obtain a slope of one-fourth of an inch per foot (20.9mm per m), any such pipe or piping four inches (101.6mm) through six inches (152.4mm) may have a slope of not less than one-eighth of an inch per foot (10.5mm per m) and any such piping eight inches (203.2 mm) and larger may have a slope of not less than one-sixteenth of an inch per foot (5.3 mm per m) (CPC § 718.1).

(Ord. 1109 § 1 (part), 1996: prior code § 5523)

Building sewers or drainage piping of clay or materials which are not approved for use within a building shall not be run or laid in the same trench as the water pipes unless both of the following requirements are met:

A. The bottom of the water pipe at all points shall be at least twelve inches (0.3m) above the top of the sewer or drain line.

B. The water pipe shall be placed on a solid shelf excavated at one side of the common trench with a minimum clear horizontal distance of at least twelve inches (0.3m) from the sewer or drain line.

Water pipes crossing sewer or drainage piping constructed of clay or materials which are not approved for use within a building shall be laid a minimum of twelve inches (0.3m) above the sewer or drain pipe.

Note: for the purposes of this section, "within the building" shall mean within the fixed limits of the building foundation (CPC § 720.0).

(Ord. 1109 § 1 (part), 1996: prior code § 5527)

Building sewer piping shall be laid on a firm bed throughout its entire length, and any such piping laid in made or filled-in ground shall be laid on a bed of approved materials and shall be adequately supported to the satisfaction of the administrative authority (CPC § 718.2).

(Ord. 1109 § 1 (part), 1996: prior code § 5524)

A. No building sewer or other drainage piping or part thereof, which is constructed of materials other than those approved for use under or within a building, shall be installed under or within two feet (0.6m) of any building or structure, or part thereof, nor less than one foot (0.3m) below the surface of the ground. The provisions of this subsection include structures such as porches and steps, whether covered or uncovered, breezeways, roofed porte-cocheres, roofed patios, carports, walks, covered driveways, and similar structures or appurtenances (CPC § 718.3).

B. Cast iron or asbestos cement pipe of four inch diameter or less is to be installed in half-lengths only.

(Ord. 1109 § 1 (part), 1996: prior code § 5525)

A. Cleanouts shall be placed inside the building near the connection between the building drain and the building sewer or installed outside the building at the lower end of the building drain and extended to grade. Additional building sewer cleanouts shall be installed at intervals not to exceed one hundred feet (30.4m) in straight runs and for each aggregate horizontal change in direction exceeding one hundred thirty five degrees. All required building sewer cleanouts shall be extended to grade. When building sewers are located under buildings, the cleanout requirements of Section 707.0 of that edition of the California Plumbing Code adopted by this code shall apply (CPC § 719.1,719.3).

B. When a building sewer or branch thereof does not exceed ten feet (0.3m) in length and is a straight line projection from a building drain which is provided with a cleanout, no cleanout will be required at its point of connection to the building drain (CPC § 719.2).

C. Every change in alignment or grade in excess of twenty-two and one half degrees from the principal alignment of the building sewer shall be served by a cleanout, except that a cleanout shall not be required where only one forty-five degree change of direction or one forty-five degree offset is used.

D. Each cleanout shall be installed so that it opens to allow cleaning in the direction of flow of the soil or waste or at right angles thereto, and except in the case of wye branch at the end-of-line cleanouts, shall be installed vertically above the flow line of the pipe (CPC § 707.6, CPC § 719.4).

E. Cleanouts installed under concrete or asphalt paving shall be made accessible by yard boxes or extending flush with the paving with approved materials and shall be adequately protected (CPC § 719.5).

(Ord. 1109 § 1 (part), 1996: prior code § 5526)