Projects - Water Systems

 

Marin Headlands Water Line Replacement

Golden Gate National Recreation Area, California

The Army installed the original water system to provide water service to Fort Baker, Fort Barry, Fort Cronkhite, the Nike Missile Site, and other military operations within the Marin Headlands.  The original water lines were 6-inch cast iron water line that were installed by the Army to service military operations at the turn of the 20th century.  The cast iron lines were deteriorated and in a state of advanced disrepair due to corrosion and tuberculation. These three separate projects represent a major water line replacement in the Marin Headlands. 



HECO did extensive water modeling of the water systems in the Marin Headlands, and used that modeling to size the new water lines which needed to increased in size from 6 inch to 12 inch (inside diameter) water lines.  The services provided were Title I preliminary design and Title II design services.  The projects consist of three separate sections within the Marin Headlands: 

Field Road:  7,600 LF Water Line Replacement
Bunker Road (Capehart):  4,300 LF Water Line Replacement
Bunker Road (Stables):  4,320 LF Water Line Replacement

Services Provided by HECO Engineers:

  • Civil Engineering
  • Project Management
  • Title I Report (Preliminary Engineering)
  • Title II Construction Documents

 


Replacement of Non-Compliant Water Treatment System

 

Yosemite National Park, California

Tuolumne Meadows is a popular destination located on Highway 120 in Yosemite National Park.  It is a high use area and is one of the Park’s most prominent attractions.  A surface water treatment system provided treated drinking water for employees and recreational visitors in the Tuolumne Meadows area.  The water treatment system was constructed in 1967 with filtration upgrades in 1984.  It was an aged facility with outdated technology.  HECO evaluated alternatives, which included treatment technologies best suited for remote sites with limited operating staff.  HECO designed improvements to the filtration system to automate the process and incorporate analytical instrumentation.  The design allows the Park to connect this site to the existing park-wide SCADA system in the future as part of another project.  The design incorporated provisions for a system shutdown in the winter months, including winterization and seasonal opening and closing procedures.  The filtration system design and equipment selection had provisions to make this process as quick and efficient as possible for the operators.  Due to the limited construction period between spring access the site and park opening, this will facilitate increased monitoring of the treatment facility from a remote central location and less on-site monitoring to increase efficiency of the operations.

Services Provided by HECO Engineers:

  • Civil Engineering
  • Project Management
  • Title I Report (Preliminary Engineering)
  • Title II Construction Documents
  • Condition Assessment


 


Water System Rehabilitation

New Plymouth, Idaho

This project was designed to achieve compliance with reduced arsenic contaminant levels and correct other system deficiencies including low pressure problems in sections of the distribution system, increased fire flows, and replacement of undersized and deficient piping.  HECO was contracted by the City in 2007 to study their system and develop a water master plan.  The results of this planning effort were used as the basis for the water system project consisting of multiple phases and construction contracts.  New Plymouth Well 9 is a new municipal well providing an additional supply with low levels of arsenic that can be blended with the current system of Wells 7 and 8.  This blending will assure that the arsenic MCL of 10 parts per billion (ppb) can be met.  The aquifer tests conducted on the well shows that it is capable of producing 1300 gpm, but the well is equipped with a 450 gpm pump according to the water rights associated with the well.  Analysis of the aquifer tests shows that the well is 85% efficient which is very good.
 
Project Included:

  • new municipal well
  • 250,000 gallon bolted steel storage tank
  • tank mixing systems
  • online arsenic concentration analyzer
  • upgrades to a municipal booster pump station, replacing of pumps and motors
  • piping and valving; variable frequency drives
  • control system upgrades
  • emergency generators
  • approximately 20,500 feet of distribution and transmission system piping


Services Provided by HECO Engineers:

  • Preliminary Engineering
  • Condition Assement
  • Project Management
  • Construction Documents
  • Construction Management
  • Survey
  • Civil Engineering



Water Master Plan and System Upgrades
 

Eagle, Idaho

HECO assisted the City of Eagle in the creation of a functional municipal water system.  This project lasted over 6 years with a total budget exceeding $5 million.  The initial stages of the project included establishment of a water master plan and complete revision of the City’s municipal code to specifically address the water system.  HECO conducted a thorough fee analysis to assist the City in establishing hook-up fees, water rates, and establish a storage and trunk line fee (STL).  This foundation enabled the City to approve two developments totaling over 2000 lots.  HECO assisted the City in negotiating development agreements with these developers to mitigate the effects of the developments on the City.  Each of the developments was required to acquire water rights, develop large capacity municipal wells, and construct the entire necessary infrastructure to establish a new water system.  HECO was contracted to perform all of the engineering for this project, which included the design and construction of two multi-pump artesian/deep wells including the associated pump houses, low flow pump stations and standby power.  In addition to the wells and constructed components, HECO’s study, report, and representation during the water rights court challenge enabled the City to acquire adequate water rights to supply this system in an area that is officially under moratorium through the Idaho Department of Water Resources (IDWR).  While this work was being completed, HECO assisted the City in obtaining judicial confirmation to construct a $2 million reservoir, additional well and well house, system wide chlorination, SCADA system and miscellaneous system upgrade project.  With these components in the City system, Eagle is able to provide adequate water and fire protection to all of the existing residents on the east side of town, with a surplus of emergency capacity that the City was able to sell to neighboring water purveyors.

Services Provided by HECO Engineers:

  • Master Planning
  • Preliminary Engineering
  • Project Management
  • Project Design
  • Survey
  • Civil Engineering
  • Construction Management
     

 

Water System Master Plan

Nyssa, Oregon

HECO prepared a comprehensive update to Nyssa’s Water System Master Plan (WSMP).  The WSMP addressed all components of the water system including system inventory, water rights, supply, demands, water quality, storage, fire protection, emergency planning, hydraulic modeling, and distribution system.  The WSMP was funded by a Community Development Block Grant through the Oregon Infrastructure Finance Authority (IFA), with review and approval of the WSMP by both the IFA and Oregon Drinking Water Services.  The City is currently using the WSMP to secure funding for a major water system improvements project to include arsenic, iron, and manganese treatment, chlorination system, controls, supply, storage, and distribution upgrades.

Services Provided by HECO Engineers:

  • Master Planning
  • Condition Assessment