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Section 38 – Sewer and Storm Drain Construction

The inclinometer data submitted shall allow easy identification of any high and/or low

sections throughout a segment, correlated with the proper footage, that vary in distance from

the design grade by more than the maximum allowed in Section 38-4.03, “Grade Tolerance –

Sewer”, of these Specifications.

38-10.04.C.(3) Computer System

The computer system shall be capable of digitally recording an MPEG file, a JPEG file, use

Agency-defined codes, compile data in a standard database format, and print TVI Reports and

graphics in accordance with these Specifications and the Contract. The system shall also be

capable of recording, storing, and playing video and images of defects and other related

significant visual information using Agency-defined codes.

The electronic data shall be in a standard database format and shall use Agency-defined

field names, field types and information as referenced in the Television Inspection Manual. The

Contractor may submit the TVI report on either a compact disc (CD) or digital video disc (DVD)

in MPEG-1 or MPEG-2 format, or as specified by the Agency. The CD/DVD shall be in a format

that is readable by the Agency’s current computer system. A list of the Agency’s current

CD/DVD readers is available at the Water Quality Department Customer Service office at 10545

Armstrong Ave., Suite 101, Mather, CA. 95655, phone (916) 876-6100. The CD/DVD shall be

of such quality that all videos, graphics, and reports are high-resolution. The disc(s) shall be

presented in a hard plastic protective case. The computer system shall be able to produce

tabular and graphical inclination data in an intuitive and useful format, as determined by the

Agency, for sag identification. All tabular and graphical reports shall be recorded and printed in

color to match the Agency’s defect severity codes.

38-10.04.C.(4) Lighting

Illumination sensitivity shall be 3 lux or less. During inspection, lighting intensity shall be

adjusted to minimize glare. Lighting and picture quality shall be adjusted to provide a clear, in-

focus picture of the entire periphery of the pipeline for all conditions encountered. Lighting shall

be adjusted according to the size of the pipe.

38-10.04.D Procedure

Mainlines shall be televised from upstream manholes to downstream manholes whenever

possible, except for flusher branches/stub lines/drain inlets. All lines televised against the flow

direction shall be noted “Reverse Set-up” on the TVI Report. The recording shall begin at the

street surface. Manhole barrels, drop inlets, and service taps shall be videoed from the center

of the manhole (footage counter set at 0.0). The focal point of the camera shall be the point to

which all footages are measured.

The Contractor shall verify footage counter accuracy prior to the start of the TVI and

calibrate the counter every two weeks during the TVI. The camera set point (footage counter

set point) shall be from the center of the manhole to the focal point in the direction of camera

travel. The camera shall travel at a maximum speed of thirty feet per minute (30 fpm) with slow

downs at joints. The camera shall stop at all service connections, significant observations, and

possible defects, and the picture shall be clear and bright enough to allow for clear identification

of any defects. The footage counter shall appear on the screen at all times. Agency-defined

codes shall be placed at each of the following observation points and the camera shall stop,

pan, and tilt at each of the following:

Inside each service connection (tap)

Inside each drain lateral connection

Alignment problems and elbows

Cracked or damaged pipe, including lined or point repaired pipe