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Sewer System

The City of Lathrop Maintenance Division provides round the clock sewer maintenance services for our community. Overall, the sewer system consists of the:

  • The Manteca-Lathrop Water Quality Control Facility
  • The Lathrop Water Recycling Plant No. 1
  • The Collection System
  • The Pump Station System

Manteca-Lathrop Water Quality Control Facility (WQCF)
The City of Lathrop owns 14.7% of the Manteca-Lathrop WQCF by Contract with the City of Manteca. The City of Lathrop, however, does not participate in the operation of the Plant. Most of the wastewater generated in the areas east of Interstate 5 and north of Louise Avenue is conveyed to the Manteca-Lathrop WQCF.

Water Recycling Plant PictureLathrop Water Recycling Plant
(WRP) No. 1

The City of Lathrop owns the WRP No. 1 Plant. All of the wastewater generated in the areas west of Interstate 5 and south of Louise Avenue is conveyed to the WRP No. 1 Plant. The daily operations of the WRP No. 1 Plant is performed by a private contractor, Veolia Water NA. The City has a 20 year Agreement with Veolia to perform these services.

A portion of the Plant treats industrial influent from the Crossroads Industrial Park Subdivision. A newly expanded portion of the plant treats influent from new development west of Interstate 5. Specifically, the newly expanded plant is designed to treat about 0.75 million gallons per day of raw sewage. The treated effluent (recycled water) meets Title 22 for re-use standards. The recycled water is utilized for a variety of purposes including landscape irrigation and farming activities for fodder crops. It is anticipated that the plant will expanded in the future to treat about 10 million gallons per day of raw sewage.

The new expansion includes advanced Membrane Bio-Reactor (MBR) technology to produce high quality recycled water to be used to irrigate landscaping, schools and parks and to grow crops on designated land application areas. A new recycled water system consisting of storage ponds, pump stations and distribution system is being constructed in conjunction with the WRP-1 MBR expansion project.

Collection System
The City Staff maintains many thousands of feet of sewer lines which are cleaned all year long to prevent overflow or spillage. If a problem occurs with a sewer line, the line is evaluated to find the source of the problem.  When appropriate, a sewer line will be placed on the "hot spot" list to be cleaned on either a monthly, bi-annual or annual basis. When possible, repairs or design modifications are made so that these "hot spots" can be put on a normal cleaning schedule.

Every new sewer line within the City of Lathrop is inspected during construction. The contractor will follow a vigorous inspection program before the City will accept the line, which ensures that the City receives a high quality product. This reduces future maintenance costs.

Pump/Lift Station System
The City of Lathrop is relatively flat. Therefore, a series of “pump” stations and “lift” stations are required to convey the influent to one of the two treatment plants. For the areas of the City east of Interstate 5, the collection system conveys the influent to the “O” Street Pump Station which then pumps it to the Manteca-Lathrop WQCF. This pump station is of the utmost importance to the City and, therefore, receives a high level of service and engineering attention. The City currently anticipates an upgrade to the station in 2005.

For the areas of the City west of Interstate 5, the collection system conveys the influent to the Mossdale Pump Station which then pumps it to the Lathrop WRP No. 1. This pump station is also of high importance to the City and, also has received a high level of engineering attention. This pump station is new and has a long service life.

The flow from our pump stations and other information regarding the system is monitored by radio telemetry. Information such as flow, pump run time, power usage, and many other parameters are collected using Supervisory Control and Data Acquisition (SCADA) software.   The central SCADA computer monitors the system and, if necessary, can be used to control the pump stations. It also has the ability to page standby personnel during emergency conditions.

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