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WASTE DISCHARGE REQUIREMENTS -3- <br /> USC/A DIVISION OF HYDRITE CHEMICAL COMPANY <br /> CLASS II SURFACE IMPOUNDMENT <br /> SAN JOAQUIN COUNTY <br /> DESCRIPTION OF THE SITE <br /> 10. The Discharger owns and operates the janitorial chemical manufacturing <br /> facility in east Stockton (Assessor Parcel Number 143-260-007-003) . The <br /> facility at 1448 Shaw Road consists of a main manufacturing building on <br /> the north side of Shaw Road, and a wastewater surface impoundment on the <br /> south side of Shaw Road. The surface impoundment covers approximately <br /> one-half acre and is approximately 6 feet deep. The site is bounded by <br /> Highway 99 to the west, the Stockton Terminal and Eastern railroad tracks <br /> to the south, a light industrial facility to the north, and a vacant field <br /> to the east. <br /> 11. Land within 1000 feet of the facility is used for commercial and <br /> industrial purposes. <br /> 12. The surface impoundment is 30 feet above Mean Sea Level (MSL). Ground <br /> water is approximately 80 feet below ground surface, or approximately 50 <br /> feet below MSL. <br /> 13. The site is underlain by the Victor Formation, Recent Alluvium, and Flood <br /> Basin Deposits, consisting of gravels, sands, silts, and clays. <br /> 14. Extensive ground water withdrawal in the Stockton area has resulted in <br /> several ground water depressions, one of which is centered approximately <br /> 5 to 7 miles northwest, and another 5 to 7 miles east of the facility. <br /> These ground water depressions have resulted in fluctuating ground water <br /> flow directions and gradients in the area. <br /> 15. The main water body in the San Joaquin Valley is the San Joaquin River, <br /> which flows northward to join the Sacramento River in the Delta area <br /> approximately 20 miles northwest of the site. The San Joaquin River is <br /> approximately 10 miles west of the site. <br /> 16. Based on water level measurements made by the Discharger, ground water <br /> flow is to the southwest. <br /> 17. The beneficial uses of ground water are domestic, municipal , agricultural <br /> and industrial supply. <br /> 18. The facility receives an average of 14 inches of precipitation per year. <br /> The mean evaporation for this facility is 65 inches per year with the <br /> average annual net evaporation at the facility being 51 inches. <br /> 19. The 100-year, 24-hour precipitation event for the facility is <br /> approximately 3.5 inches based on the Department of Water Resources <br /> Rainfall Depth-Duration-Frequency measured at the Stockton Disposal Plant. <br />