COMPLIANCE INFO_PR0440063_1990-2019

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WASTE DISCHARGE REQUIREMENTS -2- MUSCO OLIVE PRODUCTS, INC. CLASS II SURFACE IMPOUNDMENTS SAN JOAQUIN COUNTY return of perched water. The Discharger has indicated that the perched ground water zone does not extend beneath the entire site as verified by surface and subsurface soil conditions explored by boring and backhoe test pits as described in a report, dated 21 December 1992. 6. Due to the confined nature of the aquifers beneath the surface impoundments and the thick sequences of clay, ground water monitoring would not provide early detection of a leak from the surface impoundments. Therefore, a system of lysimeters is used as the primary leak detection system in the vadose(unsaturated) zone beneath the surface impoundments. 7. The Discharger has installed 38 lysimeters under Ponds A and B at 5 and 10 foot depths to monitor the vadose zone. Two additional lysimeters are functioning as background vadose zone monitoring points. Attachment C shows the lysimeter designations. Based on monitoring reports, the lysimeters are normally dry with the exception of LY#17, 18, 23, and 24. The vacuum pumps for the lysimeters are left on for up to 30 days. When there is a sufficient amount of fluids available, sampling is performed. Because TDS levels sampled from the lysimeters are higher than TDS results (5440 mg/1) in W2 (920 mg/1), it is recommended that further investigation is needed to determine the cause. WASTES AND THEIR CLASSIFICATION 8. `Designated waste' is defined in Chapter 15, Section 2522(x)(1), as a nonhazardous waste which consists of, or contains pollutants which, under ambient environmental conditions at the waste management unit,could be released at concentrations in excess of applicable water quality standards, or'which,-could cause degradation of watersofthe state:- 9. The discharge,especially after evaporative concentration,poses a significant threat to water quality. Therefore, the discharge is a `designated waste' and as such must be discharged to a Class II surface impoundment as required by Chapter 15. 10. The Report of Waste Discharge described the waste as dilute salt brine, sodium hydroxide, and ferrous gluconate. The Discharger has stated that the chemical makeup will be as follows: Constituent Concentration pH 8-9 EC 19,000 µmhos/cm TDS 14,000 mg/l COD 9,000 mg/1 CLASS II SURFACE IMPOUNDMENTS 11. Kenneth Kjeldsen, a California Registered Civil Engineer has certified that,for all three surface impoundments,the surface impoundment design(including leachate collection and removal system), vadose zone monitoring design and ground water monitoring system design comply with Chapter 15 for a Class II surface impoundment. 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 1 x 10-6 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 is pumped back to the surface impoundment.