Recycled Water Facilities Master Planning and Permitting Assistance
City of Lodi, California

West Yost has been providing recycled water treatment and land application planning and regulatory compliance services for the City’s White Slough Water Pollution Control Facility (WPCF) since the late 1990s. This work has included several planning studies related to recycled water use on agricultural properties surrounding the WPCF on other agricultural and municipal sites near the WWTP and at adjacent power plants. West Yost’s efforts culminated in the design and construction of a Title 22 tertiary filtration and UV disinfection facilities. 

West Yost has provided regulatory compliance assistance related to the reuse practices for several years. These efforts have included development of a Title 22 Engineering Report, including UV validation support, and updates to the Title 22 Report related to changes in planned recycled water uses. In addition, West Yost has developed a site-specific operations management spreadsheet tool in Microsoft Excel that allows City staff to easily complete the necessary data entry for monitoring report generation and day-to-day assessment of hydraulic and nutrient loadings associated with both recycled water and biosolids applications on the City’s properties. 

West Yost has also completed a detailed groundwater study to assess existing conditions near the WPCF. This effort culminated in a study report that detailed a variety of natural and anthropogenic factors that affect groundwater quality in the region of the WPCF. These efforts helped to identify the appropriate locations for “background” monitoring wells. Moreover, as the State’s anti-degradation policies require the implementation of appropriate Best Practicable Treatment and Control (BPTC) measures when project-related groundwater impacts are identified, this study helped to focus these efforts and has helped to justify a significant reduction in the amount of resources that need to be directed toward additional controls. 

West Yost prepared a BPTC Work Plan in 2010 and then prepared a BPTC Evaluation Plan in 2015, which documented that the existing BPTCs at the WPCF were adequately protective of groundwater. WPCF activities, including onsite application of recycled water and biosolids, were determined not to be the source of any observed exceedances of constituents of concern in groundwater samples from onsite monitoring wells. Implementation of additional BPTCs was therefore not recommended, a conclusion which the Central Valley Regional Board has not disagreed with.