Res 2005-105 - Laserfiche WebLink

Home Browse Search

City of San Marcos TPDES Permit No. WQOOI0273002 v. If the sewage sludge is generated from a mixtme of sources resulting from a person who prepares sewage sludge from more than one wastewater treatment facility, the resulting derived product shall meet one of the Processes to Significantly Reduce Pathogens, and shall meet the certification, operation. and record keeping requirements of this paragraph. In addition. the following site restrictions must be met if Class B sludge is land applied: 1. Food crops with harvested parts that touch the sewage sludge/soil mixtme and are totally above the land surface shall not be harvested for 14 months after application of sewage sludge. 11. Food crops with harvested parts below the surface of the land shall not be harvested for 20 months after application of sewage sludge when the sewage sludge remains on the land surface for 4 months or longer prior to :incorporation into the soil. iii. Food crops with harvested parts below the surface of the land shall not be harvested for 38 months after application of sewage sludge when the sewage sludge remains on the land surface for less than 4 months prior to incorporation into the soil. lV. Food crops. feed crops. and fiber crops shall not be harvested for 30 days after application of sewage sludge. v. Animals shall not be allowed to graze on the land for 30 days after application of sewage sludge. VI. Turf grown on land where sewage sludge is applied shall not be harvested for 1 year after application of the sewage sludge when the harvested turf is placed on either land with a high potential for public exposure or a lawn. Vll. Public access to land with a high potential for public exposure shall be restricted for 1 year after application of sewage sludge. viii. Public access to land with a low potential for public exposure shall be restricted for 30 days after application of sewage sludge. IX. Land application of sludge shall be in accordance with the buffer zone requirements found in 30 TAC Section 312.44. 4. Vector Attraction Reduction Requirements All bulk sewage sludge that is applied to agricultmalland, forest, a public contact site, or a reclamation site shall be treated by one of the following alternatives 1 through 10 for Vector Attraction Reduction. Alternative 1 - Alternative 2 - Alternative 3 ~ Alternative 4 - Alternative 5 - Page 15 The mass of volatile solids in the sewage sludge shall be reduced by a minimum of38 percent. If Alternative 1 cannot be met for an anaerobically digested sludge. demonstration can be made by digesting a portion of the previously digested sludge anaerobically in the laboratory in a bench-scale unit for 40 additional days at a temperature between 30 and 37 degrees Celsius. Volatile solids must be reduced by less than 17 percent to demonstrate compliance. If Alternative 1 cannot be met for an aerobically digested sludge, demonstration can be made by digesting a portion of the previously digested sludge with a percent solids of two percent or less aerobically in the laboratory in a bench-scale unit for 30 additional days at 20 degrees Celsius. Volatile solids must be reduced by less than 15 percent to demonstrate compliance. The specific oxygen uptake rate (SOUR) for sewage sludge treated in an aerobic process shall be equal to or less than 1.5 milligrams of oxygen per hour per gram of total solids (dry weight basis) at a temperature of 20 degrees Celsius. Sewage sludge shall be treated in an aerobic process for 14 days or longer. During that time, the temperatme of the sewage sludge shall be higher than 40 degrees Celsius and the average temperature of the sewage sludge shall be higher than 45 degrees Celsius.