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Download Excel NPDES Self Monitoring Program
City of Atwater, WWTF
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Organization
Central Valley Regional Water Quality Control Boardshow partners City of Atwater
Program website
view
Plan contactMatt Scroggins
559-445-6042
[email protected]
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| Start date | 06/22/2007 |
| End date | None |
| Objectives | The City owns and operates a wastewater collection, treatment, and disposal system, and provides municipal sewerage service to the City of Atwater, Castle Aviation and Development Center, and the unincorporated community of Winton. Disinfected secondary-treated municipal wastewater is dicharged under a NPDES permit to the Atwater Drain. The City contracts with Veolia Water North America-West, LLC to operate and maintain the WWTF. The WWTF includes headworks, two primary clarifiers, two aeration basins, four secondary clarifiers, and three parallel chlorine contact chambers. The WWTF is currently operated in extended aeration mode. Preliminary treatment includes a conical grit chamber, cyclone grit classifiers, a 3/8-inch bar screen and a screenings compactor. Treated wastewater is disinfected with chlorine gas and echlorinated with calcium thiosulfate and sodium bisulfite. Two anaerobic digesters process sludge from the primary clarifiers and waste activated sludge that has been partially dewaterd via gravity belt thickeners. A concrete lined sludge holding basin contains sludge from the anaerobic digesters. During the summer months, solids are pumped from the sludge holding basin to ten unlined one-acre drying beds. The WWTF produces approximately 600 dry tons of sludge annually. With the exception of leachate from the unlined sludge drying beds, liquid wastes from solids handling operations (i.e., digesters supernatant, sludge holding basin decant, sludge drying bed decant, and gravity belth thickener filtrate) are returned to the aeration basins for treatment. |
| Annual budget | None |
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Basins & sub-basins monitored
- San Joaquin River (Southeast)
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map
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Sites Monitored
| Name |
Code |
Latitude |
Longitude |
Map |
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Atwater Drain, up to 500 ft US from the pt of discharge
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R-1 |
37.342011 |
-120.607855 |
locate |
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Atwater Drain, up to 600 ft DS from the pt of discharge
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R-2 |
37.338553 |
-120.607727 |
locate |
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Parameters Monitored
| Group | Parameters | Frequency |
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| Disinfection Byproducts |
Total Residual Chlorine (TRC), Trihalomethanes |
Weekly, Annual |
| General Water Quality |
Dissolved Oxygen (DO), Electrical Conductivity (EC), Hardness, pH, Temperature, Turbidity |
Weekly, Quarterly |
| Hydrology |
Flow |
Weekly |
| Major Ions & Minerals |
Asbestos, Cyanide |
Annual |
| Mercury |
Mercury |
Annual |
| Metals & Trace Elements |
Antimony, Arsenic, Beryllium, Cadmium, Chromium, Copper, Nickel, Selenium, Silver, Thallium, Zinc |
Annual |
| Nutrients |
Ammonia as Nitrogen NH3-N, Unionized Ammonia NH3-N |
Quarterly |
| Organic Contaminants |
Acid extractable - other, Base-neutral extractable - other, Bis(2-ethylhexyl)phthalate, Organic Contaminants - other, PAHs - other, PCBs |
Annual |
| Pathogens & Bacteria |
Fecal Coliforms |
Weekly |
| Pesticides |
Organochlorine Pesticides |
Annual |
| Priority Pollutants |
Priority Pollutants |
Annual |
| Water Toxicity |
Toxicity (chronic) - Ceriodaphnia, Toxicity (chronic) - Fathead minnow, Toxicity (chronic) - other |
Quarterly |
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Data Products Available
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