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WASTE DISCHARGE REQUIREMENTS FOR -4- <br /> CITY OF TRACY <br /> CLASS II LAND TREATMENT FACILITY <br /> SAN JOAQUIN COUNTY <br /> 14. The storage and treatment facility consists of five acres of land, which will be fenced. <br /> The treatment and storage cells that now exist at the site are in poor condition. The <br /> Discharger will construct or retrofit to Chapter 15 construction requirements not more <br /> than 20 land treatment cells at the site. The Discharger has proposed that each cell will <br /> be 75 feet by 150 feet in size, and that each cell will be bordered by clean soil berms at <br /> least 2 feet 6 inches in height. <br /> 15. The beneficial uses of ground water beneath the facility are municipal and domestic <br /> supply, agricultural irrigation, stock watering, industrial process supply, and industrial <br /> service supply. <br /> 16. The facility receives an average of eight inches of precipitation per year as shown on an <br /> isohyetal map developed for the San Joaquin County Storm Drainage Study and Master <br /> Plan in January 1973. Maximum and minimum annual precipation for the site is <br /> respectively, approximately 14 inches and 3 inches, as measured between 1940 and 1980 <br /> at the Tracy weather station approximately 3 miles northeast of the site. Mean annual <br /> evaporation is expected to exceed precipitation significantly. <br /> 17. The 1,000-year, 24-hour precipitation event for the facility is 3.56 inches, as estimated <br /> by rainfall depth-duration-intensity data for the City of Newman, 30 miles to the <br /> southwest. The 100-year, 24-hour precipitation event for the facility is approximately <br /> 2.3 inches, as based on Dept. Water Resources computations generated from precipation <br /> readings at the Tracy 2 SSE weather station approximately 3 miles from the site, <br /> between 1940-1980. <br /> 18. The facility is not within a 100-year floodplain. <br /> 19. Surface drainage is to Corral Hollow Creek. <br /> 20. The beneficial uses of surface waters are municipal and domestic supply, agricultural <br /> irrigation supply, stock watering, industrial process and service supply, recreation, <br /> freshwater habitat, fish migration and spawning, wildlife habitat, navigation, ground <br /> water recharge, fresh water replenishment, preservation of rare and endangered species, <br /> and esthetic enjoyment. <br /> FACH1TIES OPERATION <br /> 21. Petroleum hydrocarbon-containing soils are placed at the site for treatment in the Class <br /> II Land Treatment unit. Soils will be spread at a thickness of 6 to 18 inches. Water for <br />