Supplemental Water Projects

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Nipomo Community Services District

Project Name
Supplemental Water Projects

Construction Management
Construction Inspection
Land Surveying


  • APWA Central Coast Chapter, Project of the Year Award
  • ASCE San Luis Obispo Chapter, Project of the Year Award


This project involved three separate construction contracts:

The horizontal directional drilling (HDD) project consisted of 2,600 feet of 30-inch high-density polyethylene (HDPE) pipe under the Santa Maria River tying into a 24-inch ductile iron pipe (DIP). The HDPE pipe was installed by HDD up to 100 feet under the riverbed, which daylighted on the bluff 120 feet above the riverbed where it connected to the newly constructed pump station.

The Blosser Road water line project consisted of placing 5,000 feet of 18-inch pipeline within a highly traveled street. Over 270 feet of 36-inch jack and bore pipe was placed under the Santa Maria levee, which then tied into the HDPE pipe within the river.

The new pump station projects consisted of a booster pump station; an electrical system with a portable backup generator; a water chloramination system and appurtenances; approximately 1,720 linear feet of all-weather access road to the pump station site; 1,750 linear feet of 24-inch DIP; and pressure reducing station. The reinforced concrete structure was founded on a driven pile foundation.

During the HDD operation, the operator ran into differing soil conditions such as stiff clays and sugar sand. In one instance, the soil caused the drill head to break while in another instance the soil provided adequate resistance for the drill to advance. MNS worked with the operator to stabilize the soil conditions with soil grouting, and then the operation proceeded successfully.

The project was constructed within a highly sensitive environmental habitat, which required extensive surveying, monitoring, and coordination with permitting agencies as well and the surrounding farmland owners.

MNS provided construction management, constructability review, contract administration, construction inspection, and land surveying services.

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