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WASTE DISCHARGE REQUIREMENTS -3- <br /> I R SRAPLOT COMPANY <br /> LATHROP, SAN JOAQUIN COUNTY <br /> 3.2-acre doubled-lined holding basin. Concentrations of total dissolved.solids (TDS) (primarily <br /> ammonium sulfate and calcium oxide) in the process area discharge and stormwater from the <br /> process area is generally greater than 2,000 mg/l and may exceed 10,000 mg/l. These wastes are <br /> classified as 'designated' using the criteria set forth in Title 27, Section 20210. All three basins have <br /> been retrofitted to conform to Title 27 double-lining requirements. <br /> 11. The Discharger's ground water monitoring indicates that water quality may have been impacted at <br /> this site from discharges from the former asphalt-lined pond,containing elevated levels of TDS and <br /> sulfates. As part of a Corrective Action, the Discharger is retrofitting the existing lined ponds to <br /> meet Title 27 standards for Class H surface impoundments. <br /> 12. The Discharger discharges an average of 0.089 million gallons per day (mgd) of stormwater runoff <br /> from the non-process area, cooling tower and boiler blowdown•and wastewater from a small <br /> package sewage treatment facility to a 7.8-acre unlined pond. The concentration of TDS in these F <br /> discharges is generally less than 1000 mg/l. <br /> 13. Discharge of wastewater from the package sewage treatment plant, stormwater from the <br /> non-process area, cooling tower and boiler blowdown to the unlined stormwater pond is exempt <br /> from the requirements of Title 27. The exemption, pursuant to Title 27, is based on the following: <br /> a. The Board is issuing waste discharge requirements, and <br /> b. The discharge complies with the Basin Plan, and <br /> c. The wastewater does not need to.-be managed according to 22 CCR, Division 4, Chapter 30, <br /> as a hazardous waste. <br /> However, this discharge is regulated as Non-Title 27 waste and is included in these requirements. <br /> CLASS II SURFACE IMPOUNDMENTS <br /> t <br /> Engineered Alternative <br /> 14. The Discharger has retrofitted'an asphalt-lined pond with a double synthetic liner consisting of a 40 <br /> mil PVC liner overlain by a 45 mil Hypalon liner as an engineered alternative to the composite liner <br /> as required by Title 27. <br /> 15. The Discharger has also retrofitted the two hypalon-lined ponds with a new 45 mil Hypalon primary <br /> liner underlain by an LCRS as an engineered alternative to the composite liner as required by <br /> Title 27, <br /> 16. The Discharger has demonstrated pursuant-to.Title 27 that the construction standard is not feasible <br /> and will be ineffective to meet the performance standards of Title 27 because of the incompatibility <br /> of the waste (calcium sulfate)with clay liners. <br />