Reports

Recycled Water Feasibility Study Final Report November 2017

Injection of purified water into a groundwater aquifer can lead to geochemical reactions such as mineral dissolution, oxidation, or desorption.   The potential for oxidation or mineral dissolution to occur can be mitigated through purified water post-treatment stabilization prior to injection.  Geochemical characterization of potential aquifer soils in the injection area can provide the data needed for geochemical modeling and to design an effective water purification process. The geochemical characterization work summarized herein includes conducting soil leaching analysis under “worst-case” scenario conditions to establish a baseline if post-treatment stabilization was not carried out on the purified water. Understanding the baseline, worst-case scenario can aid in establishing and optimizing the post-treatment stabilization regime for the target groundwater aquifer. [This is a large file, 99MB]

All water providers that have over 3,000 service connections or annually supply 3,000 acre-feet of water or more, must complete a new Urban Water Management Plan every five years. The plan requires that water suppliers ensure adequate supplies for their current and future customers. Supplies and demands must be assessed over a 20-year planning horizon and must consider various water shortages, including short-term water supply emergencies and drought.

This memorandum was drafted in response to a specific request from the Soquel Creek Water District (SqCWD) regarding nanoparticles. The SqCWD wanted to know the latest information on nanoparticles as they pertain to potable water reuse projects.