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INFORMATION SHEET <br /> Background <br /> The City of Lathrop operates a wastewater treatment facility at 19094 Howland Avenue, Lathrop, San <br /> Joaquin County. The Discharger owns the treatment plant site and storage ponds (12.2 acres). <br /> Metropolitan Life Insurance Company owns the proposed land application areas (43.8 acres). <br /> The treatment facility currently receives industrial and domestic wastewater generated in the Crossroad <br /> Industrial Development. Wastewater treatment processes include influent pumping, mechanical <br /> screening, grit and grease removal, extended aeration, and clarification. Effluent is currently discharged <br /> to three 2.4 acre evaporation/percolation ponds for disposal. The Discharger is proposing to increase the <br /> storage capacity of the existing storage ponds, line the storage ponds and develop 43.8 acres as land <br /> application areas. <br /> Previous waste discharge requirements for the Discharger's treatment and disposal facility were <br /> contained in Order No. 94-198 issued to City of Lathrop and Crossroads Sanitary Corporation. Prior to <br /> that, Order No. 92-232 regulated the Discharger. Order No. 92-232 has been rescinded; Order No. 94- <br /> 198 will be rescinded upon adoption of this order. This Order combines requirements for wastewater <br /> treatment and agronomic application of treated wastewater to cropped land application areas. <br /> The average dry weather flow to the wastewater treatment plant is currently 70,000 gallons per day <br /> (gpd). The treatment system improvements, including the addition of the land application areas, allows <br /> a flow limit of 250,000 gpd. <br /> Biosolids Disposal <br /> Solids collected from the mechanical screens, grit, and grease removal processes are hauled to a local <br /> landfill.for disposal. Waste activated sludge is dewatered by a polymer bag process or dried on concrete <br /> lined sludge drying beds, and disposed at a permitted landfill. <br /> Effluent Disposal <br /> The Discharger will land apply treated wastewater to the newly developed land application areas at <br /> agronomic rates. Wastewater will not be applied during rain events or when the soil is saturated. The <br /> storage ponds have been sized to store wastewater during the winter months. Water will be applied by <br /> flood or sprinkler irrigation to irrigate crops at agronomic rates consistent with both the nutrient content <br /> of the effluent and the water needs of the crops. Livestock will not be placed on the land application <br /> areas nor will crops grown on the application areas be used to feed milking animals for human <br /> consumption. <br /> Basin Plan, Beneficial Uses, and Regulatory Considerations <br /> Surface water drainage from the WWTF is to the San Joaquin River. The Water Quality Control Plan <br /> for the California Regional Water Quality Control Board Central Valley Region, Fourth Edition (Basin <br /> Plan), designates beneficial uses, establishes water quality objectives, and contains implementation plans <br />