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FtEi 05-1994 16:13 FROM Public Works TU tf4bQIJIw r.e� <br /> lar5et-np)-Cleated:20 May 199411:54. PW3 of <br /> ------------------------------------------------------------------ <br /> WASTE DISCHARGE REQUIREMENTS <br /> CITY OF LATHROP AND CROSSROADS SANITARY CORP. <br /> LA'I'1iROP INDUSTRIAL WASTEWATER TREATMENT PLANT <br /> SAN JOAQUIN COUNTY <br /> 3. Discharge of waste classified as 'hazardous'or'desiguated', as defined in Sections <br /> 2521(a)and 2522(a)of chapter 15, is prohibited. <br /> $. Discharge Specifications- <br /> 1. The monthly average dry weather discharge flow shall not exceed 0.2 million gallons/day. <br /> 2. Objectionable odors originating at this facility shall not be perceivable beyond the limits of <br /> the wastewater treatment and disposal areas, <br /> 3. As a means of discerning compliance with Discharge Specification No. 2,the dissolved <br /> oxygen content in the upper zone U foot)Of wastewater in ponds shall not be less than 1.0 <br /> mg/1. <br /> 4. The effluent from the mechanical treatment system shall not exceed the following limits at <br /> the point of dischar�me into the disposal ponds: <br /> Monthly Daily <br /> .O SYlt iPlit Tl._:... <br /> SSLLllllllii�a [yy=ge. maximum <br /> BOD51 mg/l 30 60 <br /> Suspended Solids mgel 30 60 <br /> Settleable Solids Trill 0.2 0.5 <br /> Tna7Ni gou(7s_N) mgR 10 <br /> 1 Five-day,20° Celsius biochemical oxygen demand. <br /> 5. A minimum of five(5)feet of separation shall be maintained between the bottom of the <br /> disposal ponds and the highest elevation of groundwater. <br /> 6. Ponds shall be managed to prevent breeding of mosquitos. In particular, <br /> a. An erosion control program should assure that small coves and irregularities are not <br /> created around the perimeter of the water surface. <br /> b. Weeds shall be minimised through control of water depth, harvesting,or herbicides. <br /> c. Dead algae, vegetation, and debris shall not ace amulate on the water surface. <br /> 7. Public contact with wastewater shall be precluded through such means as fences, signs,and <br /> Other acceptable alternatives. <br /> 8. Ponds shall have sufficient capacity to accommodate allowable wastewater flow and design <br /> seasonal precipitation and ancillary inflow and infiltration. Design seasonal precipitation shall <br /> be based on total annual precipitation using a,return period of 100 years, distributed monthly 1n <br /> accordance with historical rainfall patterns. Freeboard shall never be less than two feet <br /> (measured vertically). <br /> C_ Sludge Disposal: <br /> 1. Collected screenings, sludges, and other solids removed from liquid wastes shall be disposed <br /> of in a manner that is consistent with Chapter 15 and approved by the Executive Officer. <br />