State’s “Sampling for Lead in Schools Program” is underway

State’s “Sampling for Lead in Schools Program” is underway

La Mesa Spring Valley School District, the subject of a channel 7 news story on February 28th, is collecting water samples to determine if the plumbing or water fixtures in their schools expose students to lead. The school district’s decision to provide bottled water to students is not due to the quality of water provided by Helix Water District.

There is no lead pipe in Helix’s water distribution system, including water mains and service lines to homes and schools, and the district is in full compliance with state and federal lead and copper testing requirements.

In mid-January, the State Water Resources Control Board, Division of Drinking Water directed all water systems in the state to assist the K-12 schools they serve in determining if a school’s plumbing or water fixtures expose students to lead. The state is focused on schools because older school buildings throughout the state were built before current lead regulations were in place.

The purpose of the state’s directive is to help schools determine if their plumbing or water fixtures are a potential source of lead exposure for students and staff.  Schools can then remove or replace plumbing as needed.

Helix sent letters to all K-12 schools in our service area on January 20, 2017 to advise schools of the program and provide a point of contact should they decide to request sampling assistance from the district.  School participation in the water sampling program is voluntary, and schools must request assistance in writing.

Additional information regarding Helix Water District’s compliance with state and federal lead and copper testing, and all other water quality regulations, can be found in our annual Water Quality Report. Information on the testing for lead in schools program can be found on the State Water Resources Control Board’s website.

Surveying Helix Water District

Surveying Helix Water District

Helix Water District’s survey crews have been an integral part of the District’s day to day operations since the early 1900’s. In those early days, survey work was performed with levels to measure elevation, transits to measure horizontal and vertical angles, and chains to measure distance.

While the type of work we do has remained the same — providing Helix engineers with critical data for planning, design and construction — those early tools have been updated by advancements in technology.

Levels
Surveyors use levels to measure elevation. At right is a model from the early 1900s and a model used today.

Photo of a Theodolite, which surveyors use today to measure angles.
Photo of a surveyor's transit from the early 1900s. A transit measured horizontal and vertical angles.
Photo of a surveyor's transit from the early 1900s. A transit measured horizontal and vertical angles.
Photo of a Theodolite, which surveyors use today to measure angles.

Transits
Transits are used to measure angles.  At left is a model from the early 1900s and a model used today.

Today, Helix crews are equipped with GPS (global positioning system) receivers driven by electronic data collectors connected via Bluetooth technology, and synchronized via modem with a real-time network that allows for instantaneous positions that are accurate within one centimeter. This new technology also saves time by eliminating line-of-sight obstacles and heat wave refraction. It reduces the chance of equipment theft, as well, since our equipment remains with the survey crew at all times.

How Surveying Supports Project Design

These advancements allow Helix survey crews to perform highly accurate surveys at any position within district boundaries. And, keeping all projects and facilities tied into one coordinated system allows for seamless data transition into our districtwide GIS (geographic information system) database. These capabilities are vital during the design of new projects, such as the replacement of cast iron pipeline and the construction of new reservoir tanks. Survey crews collect existing topographic features, ground elevations, and utilities locations in the field, then download the data into AutoCad files and send it to engineering staff for design.

GPS
Left: Dave Moore, Survey Technician, and Scott Gregg, Senior Survey Technician, staking out pothole locations for a capital improvement project and recording each location with GPS. Right: Cameron Scott, Survey Technician, using GPS to locate an existing pipeline for a large valve replacement project.

How Surveying Supports Construction

Helix’s surveyors also locate existing boundary (property) line monuments to ensure that new facilities are located within established easements and right-of-way. Once these projects are designed, survey crews return to the field and provide construction crews with survey stakes to ensure accuracy of construction. Quite often, construction crews must remove a property line monument in the work area. Before they do, the construction crew will contact the surveyors to document its position.

When construction is completed, the survey crew will replace missing monuments in the original’s exact location and Helix will draft and submit a map to the County Surveyor office to be recorded. The crew will also collect final as-built locations for inclusion in the record drawings inserted into Helix’s GIS system. Collecting these accurate locations helps ensure that facilities can be easily found in the future for mark-out, repair or replacement.

Monitoring Easements

Survey crews also work closely with Helix’s right-of-way staff, monitoring Helix’s easements and main transmission lines quarterly to ensure that no new construction has infringed upon or blocked access to an easement and that Helix’s facilities are not damaged.

As Helix moves ahead in providing our customers with safe, dependable drinking water, the Survey Department will be there, continuing to play its vital role in maintaining the district’s infrastructure.

Pin It on Pinterest