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WASTE DISCHARGE REQUIREMENTS -3- RE-MANUFACTURING LTD, RENTAL MACHINERY CO., INC., AND STANLEY S. MOORE CLOSURE OF SURFACE IMPOUNDMENT AS CLASS I LANDFILL SAN JOAQUIN COUNTY 13. The beneficial uses of ground water are municipal and domestic supply, agricultural irrigation, stock watering, industrial process supply, and industrial service supply. 14. The facility receives an average of 13.3 inches of precipitation per year as measured at the Stockton Airport between the years 1949 and 1980. The mean evaporation for this facility is 78.4 inches per year as measured at Oakdale Woodward Reservoir between the years 1919 and 1968. Based on these data, average annual net evaporation at the facility is 65.1 inches. The 1000-year, 24-hour precipitation event for the facility is 4.79 inches. The 100-year, 24-hour precipitation event for the facility is 3.73 inches. 15. The existing closed surface impoundment is within the 100-year flood plain of Mormon Slough, which is adjacent to the north end of the facility. Surface drainage is to Mormon Slough which flows into the San Joaquin River. 16. The beneficial uses of these surface waters are municipal and domestic supply, agricultural irrigation supply, stock watering, industrial process and service supply, hydroelectric power generation, recreation, freshwater habitat, fish migration and spawning, wildlife habitat, navigation, ground water recharge, fresh water replenishment, preservation of rare and endangered species, and esthetic enjoyment. FACILITIES OPERATION 17. The Discharger discharged liquid waste from steam-cleaning of vehicle parts to an unlined impoundment at its facility. The unlined surface impoundment was approximately 90 feet long, 30 feet wide and four to five feet deep. 18. A waste water disposal pond was used at this site, at or near the location of the present pond, since about 1970. Active disposal of waste to the present pond was discontinued in 1988. 19. Cleanup and Abatement Order No. 89-708 ordered the Discharger to remove all hazardous sludges and soils with hazardous levels of constituents from the surface impoundment and dispose of the materials at a Class I disposal site. The volume of contaminated soil removed during closure was approximately 2000 cubic yards. The contaminated soil was transported and disposed at an approved offsite Class I landfill facility. 20. Sand blast material was also disposed to an unpermitted landfill adjacent to Mormon Slough in the 100-year flood plain and immediately adjacent to the surface impoundment. The solid waste disposal area extends eastward along Mormon Slough on property adjacent to Re- manufacturing but still within the Moore Industrial Complex. A portion of that area is leased by El Dorado Chemical Company and is not addressed by these post-closure WDRs. 21. The Discharger implemented plans to close the existing waste management unit as a closed surface impoundment in 1992. Construction activities included a low permeability clay cap. However, final certification of the closure construction has not been received.