HISTORY OF THE CITY OF GALT WASTEWATER TREATMENT PLANT
The existing site for the City’s wastewater treatment plant (WWTP) at 10059 Twin Cities Road was initially brought on-line in 1983, and provided treatment for approximately 0.83 million gallons per day (mgd). This WWTP provided for secondary treatment utilizing a comminutor, an aeration basin, oxidation ponds, and chlorine injection for bacteriological disinfection. In the winter (November-April), the WWTP was permitted to discharge to Laguna Creek, a tributary to the Consumnes River. In the summer (May-October), the WWTP reclaimed all water on City owned land for irrigation.
DESCRIPTION OF EXISTING WASTEWATER TREATMENT PLANT
In 1991, the WWTP was upgraded as mandated by Federal law to full secondary treatment. The WWTP was expanded to a capacity of 3.0 mgd of wastewater. The upgrades included a headworks, oxidation ditches, secondary clarifiers, chlorine contact chamber for disinfection, and sulfur dioxide used for dechlorination. Solids removed from treatment are stored in lagoons and injected subsurface in adjacent city owned and leased farm land. A bond in the amount of $9.77 million was used to pay for these improvements.
At this time the City has a treatment capacity 3.0 mgd and is currently operating at a daily average flow of 2.2 mgd. The City owns approximately 180 acres, and leases an additional 160 acres from the Roman Catholic Bishop (RCB) of Sacramento for irrigation and solids disposal. The RCB lease expired in April 2008, with a total of three additional option years at the discretion of the City. The lease has been extended through April, 2011.
NEW WATER QUALITY STANDARDS IMPLEMENTED
The California Regional Water Quality Control Board Central Valley Region (RWQCB, a division of the California Environmental Protection Agency) issued a new National Pollutant Discharge Elimination System (NPDES) permit on January 29, 2004 which classified the City of Galt as a major discharger. The NPDES permit is a document that allows the City of Galt to discharge treated wastewater within the compliance requirements outlined within the permit. The RWQCB utilizes criteria for the permit from the adopted Water Quality Control Plan for the Sacramento and San Joaquin River Basins known as the Basin Plan. The Basin Plan designates beneficial uses, water quality objectives, and implementation policies for the purpose of achieving water quality objectives within all waters of the Basin. The City seasonally discharges to Laguna Creek which is a tributary to Consumnes River and both are within the Basin Plan.
The Basin Plan water quality objectives were established to protect surface and ground water from contamination. The maximum contaminant levels are specified in Title 22, California Code of Regulations (CCR). The Basin Plan contains stringent requirements to ensure that surface and groundwater do not contain chemical or toxic substances in concentrations that adversely affect drinking water supply, agriculture supply, and other beneficial uses. The Laguna Creek is within the Basin Plan and therefore is required to meet these water quality objectives. Capital costs to comply with the permit range from $15 million to $40 million, with increase in operation and maintenance costs ranging from $0.71 million to $2.13 million. Current population for the City is approximately 22,982 people. Currently construction is in progress for the wastewater treatment plant improvements, and is scheduled to be completed early 2011.