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<br />City of San Marcos TPDES Permit No. WQOO 10273002 <br /> <br />Alternative 6 - The pH of sewage sludge shall be raised to 12 or higher by alkali addition and, without the addition of <br />more alkali shall remain at 12 or higher for two hours and then remain at a pH of 11.5 or higher for an <br />additional 22 hours at the time the sewage sludge is prepared for sale or given away in a bag or other <br />container. <br /> <br />Alternative 7 - The percent solids of sewage sludge that does not contain unstabilized solids generated in a primary <br />wastewater treatment process shall be equal to or greater than 75 percent based on the moisture content <br />and total solids prior to mixing with other materials. Unstabilized solids are defmed as organic materials <br />in sewage sludge that have not been treated in either an aerobic or anaerobic treatment process. <br /> <br />Alternative 8 - The percent solids of sewage sludge that contains unstabilized solids generated in a primary wastewater <br />treatment process shall be equal to or greater than 90 percent based on the moisture content and total <br />solids prior to mixing with other materials at the time the sludge is used. Unstabilized solids are defined <br />as organic materials in sewage sludge that have not been treated in either an aerobic or anaerobic <br />treatment process. <br /> <br />Alternative 9 - <br /> <br />1. <br /> <br />Sewage sludge shall be injected below the surface of the land. <br /> <br />11. No significant amount of the sewage sludge shall be present on the land surface within one hour <br />after the sewage sludge is injected. <br /> <br />iii. When sewage sludge that is injected below the surface of the land is Class A with respect to <br />pathogens, the sewage sludge shall be injected below the land surface within eight hours after <br />being discharged from the pathogen treatment process. <br /> <br />Alternative 10- <br /> <br />1. <br /> <br />Sewage sludge applied to the land surface or placed on a surface disposal site shall be <br />incorporated into the soil within six hours after application to or placement on the land. <br /> <br />11. When sewage sludge that is incorporated into the soil is Class A with respect to pathogens, the <br />sewage sludge shall be applied to or placed on the land within eight hours after being discharged <br />from the pathogen treatment process. <br /> <br />C. Monitoring Requirements <br /> <br />Toxicity Characteristic Leaching Procedure (TCLP) Test <br /> <br />- annually <br /> <br />PCBs <br /> <br />- annually <br /> <br />All metal constituents and Fecal coliform or Salmonella sp. bacteria shall be monitored at the appropriate frequency <br />shown below, pursuant to 30 TAC Section 312.46(a)(1): <br /> <br />Amount of sewage sludge (*) <br />metric tons per 365-dav period Monitoring Frequencv <br />0 ~ Sludge < 290 OnceNear <br />290 s Sludge < 1,500 Once/Quarter <br />1,500 :<; Sludge < 15,000 Once/Two Months <br />15,000 :<; Sludge Once/Month <br /> <br />(*) The amount of bulk sewage sludge applied to the land (dry weight basis). <br /> <br />Representative samples of sewage sludge shall be collected and analyzed in accordance with the methods referenced in <br />30 TAC Section 312.7. <br /> <br />Page 16 <br />