Experts in Underground Municipal and Industrial Structures
Over the past 20 years, MJP has condition assessed < 2M lineal meters of municipal sanitary and storm sewer pipes, 2,500 laterals, and 9,000 manholes. We are knowledgeable in PACP and WRc coding methods and can convert between these systems in our proprietary ACCESS-based software.
During the condition assessment procedure, our technician selects records and videos for detailed review based on calculated grades (≥ 3) and defect type. Any errors in coding are corrected, such as over/under coding by the CCTV camera operator. Our ArcGIS technician also compares the CCTV data to the client’s GIS system to verify pipe reference numbers.
We have developed cyclical CCTV sewer inspection programs integrated with GIS mapping systems, as well consolidated historical video-linked ACCESS databases. These video-linked databases contain the individual videos and reports of past CCTV inspections, and provide valuable information in developing cyclical CCTV inspection and rehabilitation programs.
Our condition assessment reports derived from CCTV inspection programs typically contain analyses of infiltration and inflow into the sewer systems and provide rehabilitation lists and preliminary cost estimates.
Our rehabilitation lists are grouped by technology so that they are “tender package ready”.
Rehabilitation recommendations take into account technologies and services available from contractors in the Lower Mainland and Alberta, as well as client budgetary limits.
MJP has a thorough knowledge in trenchless rehabilitation technologies and can select the most cost-effective method to achieve the desired rehabilitation outcome.
MJP offers confined space entry inspections for larger diameter (>800mm) structures (culverts, manholes, wet wells). This type of inspection is a comprehensive condition assessment process. It facilitates selection and design of an appropriate and cost-effective rehabilitation product. CCTV inspections often do not provide sufficient image clarity to determine the degree of pipe wall deterioration that must be addressed during the rehabilitation design stage.
MJP personnel are certified in WorkSafeBC confined space entry procedures. We have confined space safety plans hazard risk assessments and WorkSafeBC Alternative Measures plans developed by an industrial hygienist (Total Safety, Burnaby, BC) and approved by WorkSafeBC.
MJP has completed field inspection of ~285 culverts comprised of CSP, wood stave, and concrete of various geometric shapes.
Culverts <900mm are typically inspected from the culvert ends or by CCTV. Culverts >800mm may also be inspected via confined space entry procedures.
and revised by the Ohio State Department of Transportation (‘Ohio DoT’) and the California Department of Transportation (‘CALTRANS’). This protocol is well researched and developed, and provides an objective, quantitative and repeatable analysis of the culvert and associated features.
Our inspectors note not only visible signs of defects (infiltration, corrosion, surface wear) but also hammer tap (“sound”) the walls to determine if voids may present in the surrounding backfill.
Rehabilitation technologies must take into account not only what is happening inside the pipe, but also externally as void formation and potential sinkholes must also be addressed during rehabilitation.
This quantitative and holistic approach examines not only the culvert condition but also its surrounding environment. Pipe defects, as well as surrounding features, are classified with a 10-point grading system. At least two local municipalities are using this system as part of their culvert management system.
MJP has assessed ~9,000 manholes as part of numerous CCTV inspection programs since 2002 for civic authorities in the Lower Mainland and Vancouver Island. We also offer detailed inspections of manholes and wet wells via confined space entries.
Limited views of manhole or wet well chambers are obtained from ground level. Confined space entry allows detailed physical examination of concrete and metallic components. For example, the early stages of hydrogen sulfide corrosion may not be visible from above the chamber. Probing the concrete wall and measuring pit depths enables us to quantify loss of concrete wall integrity.
MJP inspectors can also perform post-manhole grouting quality control inspections to determine Contractor compliance with rehabilitation specifications (ie, proper grout hole drilling patterns).
⦁ rescue tripod
⦁ ventilation equipment
⦁ fall arrest harnesses
⦁ eye protection
⦁ face masks with hazardous material filter cartridges
⦁ safety clothing
⦁ personal air monitors
⦁ anemometers
⦁ two-way radios
⦁ an Omax Large Stage Trinocular Inspection microscope to examine pipe materials and liner samples
⦁ grout mix testing (force gauge, pH meter, hydrometers)
⦁ corrosion testing (pit depth measurements)
In 2011, MJP & Associates formed a subsidiary, Pyper Infrastructure Management Ltd., which focuses on forensic investigations of failed pipe materials, including soil sampling, corrosion assessment and time-to-failure analysis. See the Pyper website for information on this area of expertise.
Why us
