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CLASS II SURFACE IMPOUNDMENT -2- MUSCO OLIVE PRODUCTS, INC. TRACY PLANT AND THE STUDLEY COMPANY SAN JOAQUIN COUNTY 7. The ground water beneath the site is of varying quality. There are zones of saturation at approximately 30 feet and greater than 250 feet below ground surface. TOS of the water in the shallow stratum has been measured at 920 ppm. The next water bearing zone lies beneath about 200 feet of clay. This water in this zone is under pressure and is of poor quality (1,400 - 1 ,700 TOS) . It is therefore impractical and of limited value to monitor these deeper zones. 8. Surface water drainage from the site flows to an unnamed, dry creek bed which flows eastward toward the valley floor. Personnel at the site have never seen water actually flowing in this creek bed. This creek bed does not empty into another waterway, but rather disappears on the valley floor about three miles east of the site. 9. The Report of Waste Discharge describes the waste as dilute salt brine, sodium hydroxide, and ferrous gluconate. The Discharger has stated that the chemical make up will be as follows: Constituent Concentration 1986 1987 PH 6 9-11 EC 25,000 umhos/cm 12,000 umhos/cm TDS 16,000 mg/l 10,000 mg/l COD 10,000 mg/l 2,000 mg/l Iron -- 0.11 mg/l 10. The ground water monitoring system design prescribes one well into the shallow (30 foot deep) , small perched aquifer. Background ground water quality will be determined by sampling from this well prior to waste discharge. 11. The discharge, especially after evaporative concentration, poses a signifi- cant threat to water quality and a 'designated waste' and must be dis- charged to a Class II surface impoundment as California Administrative Code, Title 23, Chapter 3, Subchapter 15: (hereafter Subchapter 15). 12. The design of all three surface impoundments consist of an outer compacted clay liner two feet thick with a permeability to the brine waste of less than 1x10-6 cm/sec, a sand and geonet leachate collection system, and a 40-mil synthetic inner liner. The leachate collection system drains to a sump where leachate will be pumped back to the surface impoundment.