Martis Valley Groundwater Management Plan - Placer County Water ...

Depth-to-groundwater Procedures and Frequency of Monitoring and Reporting
The depth-to-static-groundwater level will be obtained at each well using an electric water-level
sounder with a cable graduated in increments of 0.01 foot. Before measurement, monitoring
staff will need to review the WMLB for the location of the reference point and measurement
access port. A crescent wrench may be needed to access the well casing for measurement.
Monitoring staff will need to also review past measurements in the WMLB to allow for careful
lowering of the probe or tape. 3 To obtain a depth-to-water measurement, the electric sounder
cable or tape will be lowered into the well to within 20 feet short of past measurements taken in
the same season of the year, spring or fall.
Monitoring staff will continue to slowly lower the probe through the access port until the
sounder indicates submergence by either a beeping sound or a light, depending on the type of
signal installed for that particular model. At this point, the sampling personnel will note the
depth to water (to the nearest 0.01 foot) from the reference point. The depth will be confirmed
by lifting the sounder above the water surface by about 2 to 3 feet and then remeasuring the
depth to water. If the depth remains constant, the depth to water will be recorded on Figure 6-1
(DWR Form 1213, Page 18). If measurements are showing change with each measurement, the
monitoring staff will indicate the issue on the form and, with it, attach a graphic curve of the
variable nature of the measurement, and its possible cause (e.g., bouncing, recovering water
level).
5.3 QUALITY CONTROL
After completing their field work, the monitoring staff will enter the data into an electronic
database management system. The monitoring staff will review the groundwater-level and water
quality data for accuracy within 5 days of obtaining the measurements. Should a measurement
appear suspicious, a groundwater level confirmation reading will be obtained.
3
Tape measurements will require chalking of the tape and repeated measurements as per the CASGEM Guidelines
(Page 15).
5-3