Projects

Pipe & Plant has worked on numerous successful projects for both public utilities departments of major cities as well as for private companies. These projects include multiple services and take many forms: from close collaborations with client partners, to turnkey operations, as well as design/build projects. We invite you to look through our project archive for details on the advantages of our approach and methods for delivering results across a number of real-world challenges.

Multi-year contract for San Francisco Public Utilities Commission

CLIENT: San Francisco Public Utilities Commission
LOCATION: San Francisco, California
SERVICES: Inspections and Condition Assessment, Pipe Cleaning

THE PROBLEM:

Starting in the 1990s, we have provided a variety of sewer cleaning services across the city involving debris and sediment removal from virtually every kind of sewer – from egg-shaped to circular, horseshoe-shaped, and box sewers.

OUR SOLUTION:

Work included cleaning and removing sludge, silt, and debris utilizing PPSI’s proprietary hydro-jetting methods for approximately 18,000 LF of sewer ranging from 84’’-210’’ in diameter. PPSI successfully removed 2430 CY of material, and finished the project 10 months ahead of schedule.

PROJECT CHALLENGES:

The most difficult challenge in this project was cleaning the Channel Pump Station Box Sewer, which was 17.5’ wide and 40’ deep. This particular box sewer conveys 2/3 of all wastewater in the City of San Francisco to the South East Wastewater Treatment Plant. This box sewer cannot be taken offline, it cannot be diverted, and must operate at the maximum carrying capacity possible. The waste water conveyance system in the City of San Francisco is a combined storm and sewer system. There are varying degrees of debris accumulation and very high levels of flow. Consistent cleaning is required to maintain this system so that the waste water collection system can accommodate sewer flow as well as all major storm events.

Offset manholes gave PPSI access to the Box Sewer. At each access structure, PPSI was required to implement a system of rigging, pulleys, electric hoists, and winches in order to effectively mobilize our sewer cleaning equipment into the center of the box sewer. This rigging system was installed and remained within the sewer until all cleaning was completed.

PPSI built a custom jetter nozzle designed to produce a 30’ wide spray pattern at just 10 feet away from the nozzle head. In addition to using a custom nozzle PPSI mobilized 2 ea of its proprietary grit extraction pumps into the sewer so as to maximize our production and efficiency of grit removal. Working 24 hours a day was not allowed in this location as the Channel Box Sewer is located adjacent to the AT&T Baseball Stadium and highend residential condos. The width of the box sewer allowed us to mobilize two pumps and as a result, PPSI was able to consistently remove 45 cy of material from the sewer within a single shift. Approximately 1,000 CY of material was removed from the box sewer in just 22 ea 12 hour shifts.

Complex Traffic Control: A large portion of the work required in this project was conducted in the heart of the financial district of San Franisco. PPSI’s traffic control and cleaning plans had to accomodate several conditions such as San Francisco Municipal Transportation Authority bus routes, cable car routes, electrical overhead contact transit wires, as well as very dense pedestrian traffic.

Overview: By modifying our jetting and pumping technology we were able to effectively clean the Channel Box Sewer while also adhering to strict work hour restrictions. PPSI was given a total of 24 months to complete the work required in the SFPUC project.

WORK ELEMENTS:
  • Traffic routing work.
  • Debris removal from box sewers of differing sizes, shapes, and materials.
  • Hauling and transportation of collected debris to off-site stockpile
  • Installation of sound barrier.

San Jose/Santa Clara Water Pollution Control Plant Digester Cleaning

CLIENT: San Jose/Santa Clara Regional Wastewater Facility
LOCATION: Santa Clara, California
SERVICES: Inspections and Condition Assessment, Wastewater Treatment Plant Cleaning and Maintenance

THE PROBLEM:

Work included annual cleaning of up to three digesters per year, for a total of five years, or until 10 digester tanks had been effectively cleaned. Each digester is approximately 110-ft. in diameter. Then each tank was released to Pipe & Plant Solutions with sludge at an elevation 2-ft. below the manway. Sludge contents were required to be screened and dewatered for disposal at a drying bed furnished by the Wastewater plant.

OUR SOLUTION:

PPSI developed a three-person team specifically trained to clean digesters. Their proficiency in working with proprietary pumping equipment and understanding of digester operations allowed us to finish all 10 digesters within the five-year time frame.

PROJECT CHALLENGES:
  • Confined Space Entry
  • Material Being Processed
WORK ELEMENTS:
  • Solids Dewatering
  • Permitting
  • Confined Space Entry
  • PPSI Propriety Pumping Equipment

78” Interceptor Cleaning and Inspection

CLIENT: Narragansett Bay Commission of Rhode Island
LOCATION: Narragansett Bay, Rhode Island
SERVICES: Inspections and Condition Assessment, Pipe Cleaning

THE PROBLEM:

The owner previously contracted with another company to perform inspection of 78″ interceptor in and adjacent to Collier Point Park but that other contractor claimed there was too much debris in pipeline to perform inspection.   Owner believed that debris build-up and structural failure were due to the fact that coal had been stored and a new bridge with piers was built in the same vicinity as the pipe.

OUR SOLUTION:

Pipe and Plant was able to perform a pre-cleaning inspection with its floating sonar raft and determined the pipeline was actually in service. We followed up this inspection with large diameter pipecleaning, and then a post-cleaning inspection to ensure optimal results. The pipeline continued to be in full service throughout our contract.

PROJECT CHALLENGES:
  • Long distance between manholes
  • High wastewater flows
  • Out of town mobilization

High Level Interceptor Cleaning and Inspection

CLIENT: City of Baltimore
LOCATION: Baltimore, Maryland
SERVICES: Inspections and Condition Assessment, Pipe Cleaning

THE PROBLEM:

The project consisted of approximately 15,000 LF of Interceptor Sewer of pipe diameters ranging from 66” to 100”. All work was located in a densely populated urban environment, where constant attention to safety and traffic control was paramount. Each Interceptor Segment contained an average of 30” of debris. Work also included the cleaning and inspection of two 42” diameter siphons of approximately 900 LF each that run beneath a busy correctional facility. These Siphon tubes were previously estimated to be 100% clogged with debris. Previous contractors were unable to successfully clean or inspect either tube. The city of Baltimore is under Federal Consent Decree and this capacity restoration work helps the city become compliant with the decree by maximizing interceptor capacity.

OUR SOLUTION:

For each Interceptor Segment, PPSI removed an average of 30” of debris using proprietary hydro jetting technology. Post-cleaning sonar inspections showed each segment to be a minimum of 98% clean by volume, with most segments approaching 100% clean by volume. Debris removed from the Interceptor and Siphon tubes included sand, grit, gravel, heavy rags, trash, logs, lumber, masonry and other bulk items. To restore capacity to the Siphon tubes, PPSI employed specialized dewatering techniques and confined space entry to remove bulk items as large as telephone poles. Work on the Siphons required careful coordination between outside engineering staff, subcontractors, the City of Baltimore and the State of Maryland (which runs the adjacent correctional facility.) Additional Project challenges included schedule concerns and restrictive work hours.

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Parkmerced Sanitary Sewer Inspection

CLIENT: Maximus Real Estate Partners, LLC
LOCATION: San Francisco, California
SERVICES: Inspections and Condition Assessment, Asset Management

THE PROBLEM:

Maximus was tasked by the SFPUC to provide CCTV inspection of their sewer lines at their residential complex, Parkmerced before starting a new residential housing development project. They needed to show what lines were still structurally intact in order to tap new sewer laterals into and identify what needed to be replaced.

OUR SOLUTION:

Pipe and Plant Solutions provided CCTV Panoramo Inspections to generate a condition assessment of 5,000 LF of Sanitary Sewer pipelines of diameters of 12” to 24” through various locations within the residential community. Once the inspections were complete, we generated a condition assessment report, which includes a structural integrity map, an inspection log, as well as notification to the SFPUC regarding discrepancies in GIS mapping of the sewer system.

PROJECT CHALLENGES:
  • Complex traffic control
  • Short time-frame the work
  • Communicating with student residents to about parking and traffic issues
WORK ELEMENTS:
  • CCTV Panoramo Inspection
  • Condition Assessment Consulting
  • Sewer Cleaning, Traffic Control
  • Permitting

Utility Locating at Chase Center (Warriors Stadium)

CLIENT: A&B Construction
LOCATION: San Francisco, California
SERVICES: Hydro Excavating

THE PROBLEM:

To start development on the new construction of the Chase Center, all existing utilities needed to be located. It was unclear how current the existing plans were of the area, so it was imperative that we help determine the correct location and orientation of these utilities.

OUR SOLUTION:

Pipe and Plant Solutions provided hydro-excavation to uncover existing utilities and reported those findings to the owner. PPSI also provided CCTV Panoramo Inspection of the existing storm lines to provide clarity as to the direction of flow and condition assessment.

PROJECT CHALLENGES:
  • Unclear Plans
  • Tide levels
WORK ELEMENTS:
  • Permitting
  • Traffic Control
  • Hydro-excavation
  • Utility Locating
  • CCTV Panoramo Inspections
  • Condition Assessment

Chevron Refinery Inspections

CLIENT: Bay City Mechanical
LOCATION: Richmond, California
SERVICES: Inspections and Condition Assessment, Asset Management

THE PROBLEM:

Identifying the location of all Sanitary Sewer gravity pipelines throughout the Chevron Refinery. Once all assets are identified, PPSI is responsible for mapping all access points to the existing pipelines, performing thorough CCTV inspection using instruments such as the Panoramo SI, Panoramo Camera Crawler, Lateral Launch T 76, and Push Cameras.

OUR SOLUTION:

To date, PPSI has inspected 317,000 LF of gravity pipelines of various sizes and material. Once all inspections have been performed and all reports are PACP coded, PPSI prepares a report on each location including all recommended pipeline maintenance and remediation. PPSI includes with its report a complete estimate for providing maintenance and repair as a turnkey service.

Particular challenges on this project included the complex nature of working within an active refinery. Considerable safety regulations and procedures must be adhered to, so that in the event of an emergency, all personnel may be safely evacuated.

Digester Cleaning for the City of San Mateo

CLIENT: City of San Mateo
LOCATION: San Mateo, California
SERVICES: Inspections and Condition Assessment, Wastewater Treatment Plant Cleaning and Maintenance

THE PROBLEM:

Work included annual cleaning of one egg-shaped digester approximately 100-ft. tall and 60-ft. in diameter. The city could not remove sludge effectively enough to allow for PPSI to access the tank from the manway on the site, so we were required to remove all sludge from the top of the digester using our proprietary submersible pumps.

OUR SOLUTION:

Our Digester Cleaning Crew had to first purge the tank using nitrogen to prevent any exposure to toxic gases. Normally, a pump would be inserted into the manway access, but in this case, the manway entrance was under the debris. Instead, we lowered our submersible pumps from the top of the tank and were able to clean the entire digester.

PROJECT CHALLENGES:
  • Confined Space Entry
  • Material Being Processed
  • Limited Pump Access
WORK ELEMENTS:
  • Solids Dewatering
  • Permit Required Confined Space Entry
  • PPSI Propriety Pumping Equipment
  • Nitrogen Purging

Highway 37 Cattle Pass Erosion

CLIENT: Caltrans
LOCATION: Sonoma, California
SERVICES: Pipe Cleaning, Flood Control Design/Build

THE PROBLEM:

In Sonoma, a 4×4 box culvert, which was responsible for carrying all storm run off from a hillside had become 100% full of silt, roots, and debris. During storm events water failed to pass through the culvert and found a path of least resistance through a cattle pass. The cattle pass began to erode underneath the freeway, resulting in a sinkhole developing under an active highway.

THE SOLUTION:

Fix the cattle pass and restore its structural integrity. Clear the 4×4 box culvert so that storm water could flow freely to a nearby estuary.

THE CHALLENGES:

Environmental: As a result of water not being able to flow effectively, a grove of trees and foliage had developed around both sides of the freeway. PPSI had to clear and grub, build access roads, while preserving an environmentally sensitive work area for rare birds that had migrated to the construction right of way.

Safety: All work had to be conducted off of the shoulder of an active highway with a speed limit of 55 miles per hour. Significant traffic control, ingress and egress challenges had to be engineered to provide a safe working environment

Water: The location of the project was 8 miles away from its closest source of jetting water. PPSI developed a sophisticated onsite water recycling system, where we imported 40,000 gallons of recycled water from a nearby waste water treatment plant. We recycled the water on site for the duration of the project, in effect saving over 3,000,000 gallons of water during the cleaning process. At project completion the used jetting water was determined to be uncontaminated and was applied as irrigation to cattle grazing land in the vicinity.

Design: Because of the urgency of the situation, the Department of Transportation did not have adequate time to design the solution to its problems with an engineering team. PPSI furnished a Civil Engineering team to develop the design, self-performed all of the work, and delivered a project on time and under budget.

WORK ELEMENTS:
  • Clear and Grub
  • Excavation
  • Compaction
  • Drill and Dowel
  • Concrete Reinforcement
  • Structural Concrete
  • Paving
  • Pipe Cleaning
  • Pipeline Inspection and Condition Assessment
  • Water Recycling
  • Environmental Remediation

Sem Lane and O’Neill Slough – Highway 101 in San Carlos

CLIENT: Caltrans
LOCATION: San Carlos, California
SERVICES: Inspections and Condition Assessment, Pipe Cleaning, Flood Control Design/Build

THE PROBLEM:

Several large diameter storm drains had become 100% full of bay mud throughout their years of service. This loss of capacity made it very difficult for storm water to find its way to the bay. The end result – during storm events, a nearby trailer park and neighborhood would become inundated with storm water flooding municipal roadways, local businesses and residencies.

OUR SOLUTION:

Clean the storm drains and return them to 100% carrying capacity. Replace old tide gates so that bay tidal water could not encroach on the storm drain system – allowing for storm water to leave the system, but not infiltrate the existing system. Installation of additional manholes, which would make maintenance easier for Caltrans crews.

THE CHALLENGES:

Safety: All work had to be conducted off the shoulder of an active highway with a speed limit of 65 miles per hour. PPSI had to maintain a construction right of way that was 8’ wide and 1000’ long. We did this by using Concrete Krail Barrier and having lane closures for major ingress and egress events

Debris to be Removed: Bay mud can be synonymous with quick sand. When one tries to handle this material it turns into a sludge that is consistent with drilling mud. PPSI had to develop means not only to remove this material, but also to dewater the material enough so that it could be disposed of in an economical fashion.

Water: The nearest source of water for cleaning purposes was thousands of feet away. In addition to dewatering bay mud for disposal, PPSI developed a sophisticated onsite water recycling system where we recycled all water in the existing storm drain system for cleaning purposes… saving 5,000,000 gallons of water during the cleaning process.

Tide: Because tide control gates had become corroded and had failed, the entire surrounding storm drain system was effected by the tide. Work had to be performed in accordance with the fluctuating tides. PPSI was required to develop a cleaning plan that accommodated the tide schedule and one that could maintain the normal function of the storm drain system.

Design: Because of the urgency of the situation, the Department of Transportation did not have adequate time to design the solution to its problems with an engineering team. PPSI furnished a Civil Engineering team to develop the design, self performed all of the work, and delivered a project on time and under budget.

WORK ELEMENTS:
  • Clear and Grub
  • Excavation
  • Compaction
  • Manhole Installation
  • Culvert Concrete Repairs
  • Paving
  • Concrete Curb and Gutter
  • Tidal Control
  • Cofferdam
  • Environmental Remediation
  • Pipe Cleaning
  • Sludge Dewatering
  • Pipeline Condition Assessment
  • Water Recycling

2015 CCTV Inspection and Cleaning Services of Sanitary Pipelines

CLIENT: City of Stockton
LOCATION: Stockton, California
SERVICES: Inspections and Condition Assessment, Pipe Cleaning

THE PROBLEM:

The sewer system within the City of Stockton required extensive cleaning and condition assessment as their system was intended to handle heavier flows that they are experiencing, especially in their larger diameter lines. This is resulting in debris settling and creating gases that are affecting structural issues.

OUR SOLUTION:

PPSI was able to furnish top of the line cleaning and inspection equipment. Our unique cleaning trucks are able to efficiently and effectively clean their large diameter sewer systems with ease. We then follow up with our inspection crew to thoroughly inspect each pipe to provide a detailed condition assessment of their sewer lines.

Westerly Interceptor Cleaning and CCTV Inspection

CLIENT: City of Elizabeth
LOCATION: Elizabeth, New Jersey
SERVICES: Inspections and Condition Assessment, Pipe Cleaning

THE PROBLEM:

PPSI was contracted to complete the cleaning of a critical section of 60” Interceptor for the City of Elizabeth, New Jersey. In addition to capacity restoration, the owner’s goals included CCTV inspection of the entire pipeline to be cleaned. This CCTV inspection was to be done while bypassing flows up to 6 MGD to allow for a complete visual inspection of the pipeline.

OUR SOLUTION:

Cleaning access was a challenge on this particular project due to elevated manholes, adjacent wetlands, and levees located on and around the pipeline. Using both careful work sequencing and unique strategies to mobilize heavy equipment in difficult to reach areas, PPSI was able to complete the cleaning of the Interceptor. PPSI was required to construct access to the cleaning area that could later be removed to restore work areas to pre-contract conditions. After a section of the Interceptor was cleaned, a multi-stage bypass was assembled to completely dewater the interceptor Segment to be televised during the CCTV inspection. Close coordination with multiple utilities local government agencies was critical to complete the bypass and inspection in a limited time window.

Marin Gateway Shopping Center

CLIENT: Marin Gateway GARP, LLC
LOCATION: Marin, CA
SERVICES: Flood Control Design/Build

THE PROBLEM:

There is a pond located at the shopping center that has a poor storm drain system, which causes the highway to flood.

OUR SOLUTION:

PPSI cleaned and inspected the pipeline to discover there is a section of pipe missing. We set up flood prevention measures, which include pumps and muscle wall to prevent flooding of the highway during the El Nino. We have plans to fix the pond to prevent future flooding.

Collection System Siphon Cleaning

CLIENT: Middlesex County Utilities Authority of New Jersey
LOCATION: Middlesex County, New Jersey
SERVICES: Inspections and Condition Assessment, Pipe Cleaning, Bypass, Flow Diversion, Dewatering

THE PROBLEM:

Super Storm Sandy adversely affected Middlesex County causing much of their critical wastewater infrastructure to be submerged by flooding. Staffing and personnel changes resulted in insufficient information on siphon chambers in a crisis situation. Wastewater wasn’t flowing normally, and it was clear that the triple barrel siphon design capacity was severely compromised.

OUR SOLUTION:

Pipe and Plant deployed a specially trained siphon crew to perform a series of linked actions to resolve the problem:

  • Managed wastewater within chambers while cleaning with jet-vac method
  • Conducted inspections with CCTV and sonar
  • Remove debris
  • Restore capacity
  • Inspect to full contract specification.
PROJECT CHALLENGES:
  • Winter work in freezing conditions
  • Upstream and downstream chamber sites separated by 300-ft. wide South River
  • Off road worksite, no hydrant water available for jetting
WORK ELEMENTS:
  • Out of town mobilization
  • Multiple stakeholder coordination permit required
  • Confined space entry
  • Flow control
  • Recycled sewer water jetting
  • Pumping of jet water
  • Siphon dewatering and cleaning, grease removal

Internal CCTV Inspection and Sonar Profile of North Yonkers Trunk Sewer

CLIENT: Westchester County Department of Environmental Facilities
LOCATION: Yonkers, New York
SERVICES: Inspections and Condition Assessment

THE PROBLEM:

After an unrelated procedure was completed in the sewer system construction project near the Trunkline, a municipal crew reported high wastewater flow in one manhole and suspected an unknown blockage. Water levels were too high to enter the area, as the manhole chimney was underwater.

OUR SOLUTION:

Pipe and Plant Solutions deployed a specially trained CCTV and sonar inspection team to inspect fully surcharged lines. The inspection results were sufficient for the owner to specifically design a rehabilitation project based on actual field data and conditions.

PROJECT CHALLENGES:
  • High pedestrian traffic work area
WORK ELEMENTS:
  • Prevailing wage work
  • CCTV and sonar
  • Traffic control