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Download Excel NPDES Self Monitoring Program
United States Department of the Interior, National Park Service, Yosemite National Park, Wawona WWTF
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Organization
U.S. Department of the Interior, National Park Serviceshow partners CVRWQCB
Program website
view
Plan contactPaul J. Laymon
209-379-1077
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| Start date | 10/21/2005 |
| End date | None |
| Objectives | The Discharger owns and operates the Wawona WWTF. The WWTF is a Publicly Owned Treatment Facility or POTW within the meaning of the Federal Clean Water Act and implementing regulations. The WWTF consists of an equalization tank, activated sludge treatement system, coagulant and polymer injections, rapid mixing, flocculation, final sedimentation, sand filtration, alum injection to remove phosphorous, and chlorination/dechlorination. Effluent is chlorinated and pH balanced before it is pumped to two aboveground storage tanks providing a total capacity of five million gallons and additional chlorine contact time. Treated wastewater is intermittently discharged from Discharge 001 to the South Fork of the Merced River, a water of the United States, within the South Fork Merced Hydrologic Area. In addition, treated wastewater is blended with river water in the storage tanks and used to irrigate the Wawona Golf Course (Discharge 002). |
| 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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Merced River, 250 ft US from the location of Outfall 001
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R-001 |
37.53866 |
-119.654307 |
locate |
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Merced River, 50 ft DS from the location of Outfall 001
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R002 |
37.53852 |
-119.655851 |
locate |
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Parameters Monitored
| Group | Parameters | Frequency |
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| Disinfection Byproducts |
Total Residual Chlorine (TRC), Trihalomethanes |
Weekly, Annual, Other |
| General Water Quality |
Dissolved Oxygen (DO), pH, Specific Conductance [EC @ 25 deg C], Temperature, Turbidity |
Weekly |
| Hydrology |
Flow |
Daily |
| Metals & Trace Elements |
Copper |
Monthly |
| Nutrients |
Ammonia as Nitrogen NH3-N, Phosphorus, Total Kjeldahl Nitrogen (TKN) |
Weekly |
| Organic Contaminants |
Acid extractable - other, Base-neutral extractable - other, Bis(2-ethylhexyl)phthalate, Organic Contaminants - other, PAHs - other, PCBs |
Other, Not Recorded, Annual |
| Pathogens & Bacteria |
Total Coliforms |
Biweekly |
| Pesticides |
Organochlorine Pesticides |
Not Recorded, Other |
| Water Toxicity |
Toxicity (chronic) - Ceriodaphnia, Toxicity (chronic) - Fathead minnow, Toxicity (chronic) - other |
Quarterly |
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Data Products Available
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