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Section 38 – Sewer and Storm Drain Construction

When indicated on the Plans or directed by the Agency, storm drain pipes and structures

shall be abandoned in conformance with Section 15-1.04, "Abandonment of Pipes and

Manholes", of these Specifications.

Construction of the cleanout to grade for all sewer services is required. Construction of the

top one foot (1’) of the cleanout riser may be delayed until installation of the building sewer at

the option of the Contractor, except where the water main is to be installed at the back of the

sidewalk (refer to Note 10, Standard Drawing 7-5). If construction of the top one foot (1’) of the

riser is delayed, the location of the service shall be accurately staked with a four-inch by four-

In addition, where curb and gutter exists, or is to be constructed concurrently with sewer

facilities, the location of each sewer service shall be permanently indicated by inscribing the

letter "S" two inches (2”) in height in the curb directly above the line when the service is

perpendicular to the street centerline. Otherwise, the "S" marks for skewed or angling services

shall be placed at a right angle to the end of the service. When sewer services are installed in

an existing street, the curb mark shall be placed at the time the service is installed to assure

In new subdivisions when the sewer services are installed before the curb is constructed, it

is the Contractor's responsibility to establish the exact location of each sewer service and to

furnish this information to the Agency.

In all alley improvements where a main is being replaced, all services to that main will be

replaced and a clean-out installed as shown or specified in the Contract.

Service sewers shall be installed as detailed on Standard Drawing 7-5 and at the locations

shown on the Plans. Unless otherwise specified, service sewers shall be four-inch (4”) diameter

in residential areas and six-inch (6”) diameter in commercial and industrial areas and

constructed to the property line or easement line. Except as otherwise specified herein, service

sewers shall be of the same material as the lateral sewer to which it connects. In residential

areas only the following exceptions are allowed:

ABS-DWV (Schedule 40, ASTM D 2661) pipe may be connected to a VCP “T” or “Y” as

shown on Standard Drawing 7-5.

A regularly manufactured “T” or “Y” fitting of the same materials as the collector sewer

shall be used in the collector sewer and shall be inclined upwards at a minimum angle of

twenty-five degrees (25

) and a maximum of forty-five degrees (45

) from the horizontal.

The ends of all service sewers shall be securely sealed by stoppers in such a manner

that the stoppers can be removed for extending the line without damage to the pipe.

Unless otherwise shown on the Plans, the depth of cover of the service sewer at the

easement or property line shall be a minimum of four feet (4’) and a maximum of five

feet (5’) below existing ground or edge of adjacent roadway, whichever is at the lower

elevation, except that the minimum depth of cover shall be five feet-six inches (5’-6”) and

the maximum six feet (6’) where a water main is to be installed at back of sidewalk as

part of subdivision improvements. In such cases, as detailed in Standard Drawing 7-5,

the service shall also be extended to the back of the 12.5 foot PUE or a minimum of ten

feet (10’). The cleanout to grade, however, shall remain a maximum of two feet (2’)

behind the sidewalk, and a second cleanout installed at the end of the extension. Any

elevation given shall be a maximum allowable elevation, and the minimum slope of the

service shall be one-quarter inch per foot (1/4” per 1’). If the service is to be bored, the

tolerance of the operation must be within these limits.

If the service sewer will have less than three feet (3’) of cover as measured from the top of

the finished subgrade, Class 200 cast or ductile iron pipe, or PVC (DR-14) pipe conforming to