ATTACHMENT “B”

DETAILED

SPECIFICATIONS –

MULTI-SENSOR

INSPECTION OF SEWERS

AND APPURTENANT

STRUCTURES

(SECTIONS 2.13-2.26)

2.13 SCOPE OF WORK: The work covered by these specifications consists of furnishing all supervision, labor, materials, and equipment necessary to perform detailed CCTV, Sonar, 3D laser (lidar), and drone inspections of the sewers specified, as well as completing and submitting all related data and reports. This includes traffic control and/or sewer flow control to the extent required, in accordance with these specifications and all applicable local, state, and federal rules, laws, regulations, and ordinances pertaining to the work.

The specifications described in this section cover CCTV inspections, Sonar inspections, 3D laser inspections (lidar), combined CCTV /3D laser / inspections as well as drone inspections.

2.14 JOB DATA TO BE PROVIDED TO THE CONTRACTOR

The City’s Representative will provide the following information to the Contractor when work is assigned.

1) On Street

2) Starting Manhole / Access Point #

3) Ending Manhole / Access Point #

4) Hundred Block

5) From Street

6) To Street

7) District Number

8) Total Footage

9) Type Sewer

10) Owner

11) Construction Material

12) Lining Material

13) Shape

14) Diameter / Height

15) Purpose

16) Project Name

17) WO Request Number

18) Expedited Handling (Yes / No)

19) Inspection Type

The City will also supply all drawings, maps, and related information required for the Contractor to locate the sewers or appurtenant structures to be inspected.

2.15 PLATFORM/TRANSPORT EQUIPMENT OF INSPECTION TECHNOLOGIES

2.15.1 The provision of a stable platform capable of carrying a payload of a minimum of three inspection sensors within a confined space sewer, allowing for simultaneous, synchronized data collection in order to accurately determine existing conditions within a pipe of 36" diameter or greater.

2.15.2 Equipment should be capable of insertion via a standard 24” circular manhole opening.

2.15.3 Equipment should allow for complete inspections during full, partial, or no flow conditions.

2.15.4 The equipment must be rated to a depth of 150’ (45 m) and capable of deployments of a minimum of 5,000’ (1500 m) either with or against the flow.

2.15.5 The Contractor, in accordance with the City, may determine if floating or tracked platform is to be used on a case-by-case basis. However, the MSI system that is deployed should not change based on traction mode (i.e. crawler-based and float-based operations must utilize the same MSI system). The system shall not require different sensor packages, sensing modalities, or calibration methodologies based on deployment method.

2.15.6 All camera transport systems shall be able to navigate around minor obstructions commonly found during a sewer inspection.

2.16 CCTV INSPECTION REQUIREMENTS

2.16.1 The purpose of a CCTV inspection component in a Multi-Sensor Inspection is to visualize pipeline defects and features. CCTV inspections gather digital images of the complete end-to-end and overhead arc of pipe coverage above the fluid level.

2.16.2 All CCTV sewer inspection work must be completed by certified National Association of Sewer Service Companies (NASSCO) Pipeline Assessment and Certification Program (PACP) trained operator(s) using established PACP coding, observations, and protocols (version 7.0 or later, as determined by City’s representative). In addition, the Contractor’s site supervisor and QA / QC technician(s) must also be NASSCO PACP certified.

2.16.3 The Contractor shall furnish and maintain, in good condition, all televising equipment necessary for proper execution of the work.

2.16.4 All equipment must be approved for use in Class I, Division I, Group 0 Hazardous Locations as defined by the National Fire Protection Association (NFPA) Code 820-1999.

2.16.5 The Contractor shall use either a standard color pan-tilt-zoom camera, or a commercially available high-definition 360-degree camera designed for consumer or industrial imaging. Custom-fabricated assemblies that introduce image distortion (such as a modified fisheye lens) will not be accepted. Video that relies on low frame-rate or time-lapse imagery will also not be accepted.

2.16.6 The lighting for the pan-tilt-zoom or HD 360-degree camera shall provide a clear picture of the entire periphery of the existing sewer.

2.16.7 The footage counter for each active camera must be calibrated before starting work on this contract, as well as at least every two weeks during field operations. The footage counter must be accurate to 0.5 feet per 100 feet. Contractor shall provide footage calibration procedures and logs for each crew every two weeks as part of the weekly progress report.

2.16.8 The Contractor is required to use GraniteNet software in the NASSCO

PACP module (version 7.0 or later, as specified by City’s representative) for the collection and analysis of all CCTV sewer inspection data. The specific software version and/or any required add-on modules used by the City will be determined by the City’s Representative who will notify the Contractor before the start of work.

2.17 3D LASER (LIDAR) INSPECTION REQUIREMENTS

2.17.1 General Objective:

3D laser scanning provides an accurate determination of pipe geometry above the fluid level. Internal diameter and deflection graphs will be used in conjunction with the integrated and detailed views to precisely quantify internal pipe wall material loss/gain or deformation at a given payout location and clocking angle. Pipe cross-sections obtained from precision high resolution scans will be used to provide quantitative information regarding internal pipe diameter, including ovality.

Precision scans are produced with multi-color indication depicting deviations from as-built conditions as well as localized material gain and/or loss.

2.17.2 3D Laser Inspection Detailed Description of Work:

Laser scanning shall be conducted continuously and simultaneously with other inspection technology for the entire length of the pipeline as identified in the detailed Scope of Work. Laser equipment shall be moved through the pipeline on a transport vehicle capable of supporting the laser inspection equipment above the water level. Tracked platforms must be capable of forward/stop/reverse mobility for detailed high-resolution scans to be collected at a specified interval.

2.17.3 Minimum Equipment Standard Requirements:

Laser scanning equipment shall be capable of measuring the distances to objects and surfaces in pipes and shall be capable of imaging pipes from 36” to 250” in diameter when used on a tracked platform and 80” to 250” in diameter when on a floating platform. The laser shall support 75 Hz scan rates or higher and be Class 1: eye-safe for operator. The laser sensor resolution shall be at least 1mm.

The inspection system should also utilize a true imaging lidar with a minimum of 32 laser channels (though 64 are preferred), an approximately 90-degree vertical field of view, and a data acquisition rate exceeding one million points per second, suitable for resolving localized corrosion, wall loss, deformation, and geometric irregularities at close range. The 3D laser should produce dense, continuous point clouds across a substantial portion of the pipe in a single inspection pass. Multi-layer scanning lidars with limited vertical field of view or insufficient point density will not be accepted.

2.17.4 Laser Scan Results (Included in Multi-Sensor-Inspection report):

An overview of data is to be presented in a color-coded format as 2D cross sections conveying pipe condition above the laser’s centerline over the length of the inspection segment. Measured pipe ID that coincides with expected values must be coded green. Outward deformations, as measured by increasing pipe ID, must be colored on a yellow/red color scale, advanced deformation. Material gain (buildup) or inward deformation, as measured by decreasing pipe ID, must be on a blue color scale. To support identified radial localization of defects, individual ID measurements as computed from the axis of the inspected pipe must be presented in an illustrated ovality and deflection graphs covering the length of the inspection segment.

Laser scan results identifying ovality and deflection must be presented in 2D cross-sections. The color coding is to be identical to the aforementioned requirements. Where the presence of fluids in the pipe necessitates interpolation and estimation, calculations to fill gaps and complete the full circumference view must be performed. The method and calculations used to support these assumptions must be presented.

Sonar or as-built data, if used for these calculations, must be identified in the report. Areas revealing deflection greater than 2% ovality and 5% defection must be identified in the report.

Any high-resolution scans obtained during the inspection are to be provided along with the report in a 3D point cloud (VRML) format including software for viewing on a PC.

2.17.5 Error Tolerance:

Precision Ovality Scans including but not limited to Sensor Error, Axis Alignment Error, and Processing Errors must be accurate to +/- 1 %

2.18 SONAR INSPECTIONS REQUIREMENTS

2.18.1 General Objective:

Sonar scanning provides an accurate determination of pipe conditions below the fluid level during an in-pipe inspection. Sediment depths must be measured at regular intervals and averaged over the payout length in order to show the average depth at each interval.

2.18.2 The digital sonar inspection equipment must be capable of providing accurate real-time travel distance (feet) and dimensional data (inches) for sediment level, grease accumulation, pipe deformation (and/or corrosion) and pipe shape offsets, below the waterline, in partially full, full and surcharged sewers, as well as in syphons.

2.18.3 The sonar inspection unit should be streamlined in shape to minimize the collection of debris on the unit while in use.

2.18.4 The digital sonar inspection equipment must be capable of generating

360-degree high-resolution pipe geometry profiles of sewers ranging in diameter from 36” through 18’, including large diameter interceptor sewers.

2.18.5 The sonar transducer shall be continuous scanning, and the beam width of the sonar energy pulse shall range between 1.1 and 1.8 degrees from the center of the transducer.

2.18.6 Pitch and roll sensors inside the scanner must have the capability to record the altitude of the sonar unit to a resolution of 0.1 degree.

2.18.7 The orientation of the sonar transducer must be shown on the final report for each completed sewer segment inspection.

2.18.8 The Contractor must have the capability to complete inspections using single frequency (2 MHz) or multi-frequency sonar units (600 kHz to

1.0 MHz), depending on the expected sewer conditions. The Contractor will consult with the City’s Representative before finalizing the equipment choice (as required).

2.18.9 The sonar transducer must complete a 360-degree profile of the sewer at least once per second.

2.18.10 The sonar inspection unit should not exceed a travel speed of 4 inches per second.

2.18.11 Sediment depth must be measured at the start and end of each sewer segment inspection. Additionally, sediment depth must be measured at a minimum of twenty-five-foot (25’) intervals during the inspection, as well as at any significant observed changes in sediment depth (5 percent or more of sewer diameter).

2.18.12 High resolution 2D cross sectional scans (snapshots) must be taken at the start and end of each sewer segment inspection and every 100’ at a minimum.

2.18.13 The sonar inspection software must be able to display live data from the sonar scanning unit and show the information as an image using at least 256 colors to designate signal amplitude.

2.18.14 The sonar inspection software must have real time measurement capabilities. This should include point-to-point measurement, diameter measurement using a circle overlay, and area calculations to acquire volume data of sediment and debris. Measurements must be able to be printed on reports and saved with the image.

2.18.15 Sonar inspection software shall display both graphically and numerically the pitch and roll data (degrees) from the sonar scanning unit.

2.18.16 Sonar inspection software shall numerically display distance (feet) from the encoder to the cable drum.

2.18.17 If The Contractor uses proprietary software and/or a viewer in conjunction with the sonar inspection, post-processing, or QA/QC review, the City’s Representative may request up to three (3) licensed copies of this software for City use during the duration of this contract.

No separate payment will be made to the Contractor for provision of this software.

2.18.18 Sonar Scan Results (Included in Multi Sensor Inspection report):

Final reports must include graphical display of sediment volume and location, sediment levels, and pipe capacity depicting actual vs. ideal storage capacity. The data shall be compiled in a format that can be used for calculating changes in sediment depth, sediment volume, and sediment accumulation, when compared to past or future condition assessments.

2.18.19 Error Tolerances for Sediment Quantification:

Where sediment/debris volume estimates are given, the volume calculation accuracy shall be a minimum 92% for pipelines between 36” (900 mm) and 54” (1350 mm) diameter inclusive, and a minimum of 95% accuracy for pipelines equal to or greater than 60” (1800 mm) diameter.

2.19 DRONE INSPECTION

2.19.1 General Objective:

The purpose of a drone inspection is to conduct CCTV inspections where traditional CCTV equipment may not be feasible due to access issues, pipe alignments, sewer conditions that cannot accommodate traditional equipment, and/or size of the sewer, among others. Drones may also be used to inspect sewers or related infrastructure from the outside, such as at stream crossings.

2.19.2 Contractor must employ a minimum of two certified remote pilots to operate equipment and be available to support emergency inspections as needed.

2.19.3 Lighting must be adjustable, dustproof, and optimized for low light environments at a minimum of 10,000 lumens.

2.19.4 Drone inspection equipment must be capable of stable flight without reliance on GPS and must incorporate a protective cage that prevents propellers from interacting with sewer walls or other obstructions during inspections.

2.19.5 Drone inspection equipment must be capable of safe use in confined space sewers ranging in diameter from 36” through 20’. Equipment must be able to inspect segments up to 500’ long between manholes.

General purpose or outdoor-only drone equipment will not be accepted.

2.19.6 The drone equipment should not exceed a travel speed of 60 feet per minute, as required by NASSCO PACP or as otherwise directed by the City’s representative.

2.19.7 All inspection videos must be submitted to the City in .mp4 format with one video per pipe segment (as designated by City’s representative) for import into the GraniteNet platform. If/when technology becomes available, drone inspections must also be coded using NASSCO PACP (version 7.0 or later, as requested by City’s representative) and submitted to the City using GraniteNet.

2.20 MULTI-SENSOR INSPECTION - PROJECT NAME PROCEDURES

PWD will provide naming convention and procedures upon awarding of the Contract.

2.21 CONTRACTOR QUALITY ASSURANCE (QA) / QUALITY CONTROL (QC)

PROCEDURES

2.21.1 Upon completion of each sewer inspection, the Contractor’s operator(s) will provide their electronic reports for their internal QA / QC review.

2.21.2 Quality Control (QC), following developed procedures and under Quality Assurance (QA) documentation, will be performed before approving the reports and data, and providing them to the City’s Representative.

2.21.3 The Contractor will provide a copy of their QA / QC procedures to the City’s Representative, prior to the start of work.

2.21.4 The Contractor will follow their own internal procedures, as well as the additional QA / QC procedures as described in this section.

2.21 CITY REPRESENTATIVE QUALITY ASSURANCE (QA) / QUALITY CONTROL

(QC) PROCEDURES

2.21.1 Inspection information, data, and reports will be reviewed by the

City’s Representative to ensure adherence to these specifications.

2.21.2 Inspection data will be reviewed for technical quality and to ensure adherence to QA / QC standards.

2.21.3 Any sewer segment where the inspection data is missing, incomplete, or inaccurate will be rejected and returned to the Contractor.

2.21.4 Data revisions and/or sewer segment re-inspections will be completed by the Contractor at no additional cost to the City.

2.21.5 Reports requiring data revisions or corrections must be updated and returned to the City’s Representative no later than three (3) calendar days after receipt.

2.22 SAMPLE FINAL REPORT SUBMITTAL BY CONTRACTOR

2.22.1 Upon award of this contract and receipt of the Notice to Proceed, the Contractor shall provide a sample final report of each type of inspection (CCTV, drone, Sonar & 3D Laser)

2.22.2 The City’s Representative will advise the Contractor if revisions to the report and data are required. The Contractor will take the required corrective action(s) and resubmit the report.

2.22.3 Once the Test Inspection and Report submittal have been approved by the City’s Representative, The Contractor may begin inspection work.

2.23 APPROVAL OF COMPLETED INSPECTIONS BY CITY’S REPRESENTATIVE

2.23.1 The City’s Representative will advise the Contractor when individual jobs have received final approval. Once final approval is reached, the jobs can be submitted with the next monthly bill.

2.23.2 No payment will be made for any work until it is reviewed and approved by the City’s Representative.

2.24 CONTRACTOR GENERAL SUBMITTALS & DELIVERABLES

2.24.1 Each project folder shall contain the project report and data and be named according to the convention described in Section 2.36.

All deliverables must align with City’s designated pipe segments using the provided start/stop endpoints for each inspection or report.

2.24.2 Each project folder shall contain, at a minimum, a GraniteNet

PACP (version 7.0 or later) database with corresponding pictures and video files for the CCTV portion of the inspection.

2.25 SUBMITTAL DEADLINES

2.25.1 Submittals and deliverables must be forwarded to the City’s

Representative weekly (on Friday), unless otherwise specified.

2.25.2 The Contractor must submit individual MSI inspections to the City’s Representative no later than fourteen (14) calendar days after field work has been completed.

2.26 SPECIAL NOTE –BILLING

2.26.1 The contractor must follow all related billing procedures as described in Section 4, as well as the following two (2) items:

2.26.2 Invoice: The Contractor must supply an extra copy of the invoice directly to the City’s Representative.

2.26.3 Work Summary Report: In addition to the invoice, the Contractor must also supply a sewer inspection work summary report to the City’s Representative, in digital format, as a MS Excel spreadsheet.

The report should include only the completed jobs contained on the related invoice. The report should follow the format specified in Appendix A Section 2.9.

Note: payment will only be made for fully completed, reviewed, and approved jobs.