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TENTATIVE WASTE DISCHARGE REQUIREMENTS ORDER 10._ -2- KRUGER FOODS / SMS BRINERS VEGETABLE BRINING FACILITY CLASS lI SURFACE IMPOUNDMENT CLOSURE SAN JOAQUIN COUNTY WASTEWATER CLASSIFICATION 6. The wastewater discharged into the surface impoundments prior to injection includes three components. The first component is process water, which incorporates waste brine,wash water, and brine tank rinse water. The second component is storm water run off,which incorporates runoff from the brining pads and from facility roadways. The third is extracted groundwater from MW-1 as part of their corrective action program. 7. `Designated waste' is defined in California Water Code, §13173, 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 waters of the state. The Dischargers' wastewater is a significant threat to water quality, and therefore is classified as a `designated waste'. The water code will allow containment of this class of wastewater in a class II surface impoundment, or it maybe injected into a specified hydrostratigraphic zone. SITE DESCRIPTION 8. From the Dischargers boring logs the hydraulic conductivity of the native soils underlying the Unit is estimated between 5 x 10-3 cm/sec (medium sand) and 4.7 x 10-9 cm/sec (clay). 9. Approximately 40 miles south of the Dischargers ponds extends the Great Valley Fault, This is the closest Holocene fault to the facility. The maximum moment magnitude of the Great Valley fault is 6.7. The peak ground acceleration for the site is 0.244 g. 10. Land uses within 1,000 feet of the facility are agricultural fields. There are no residences within 1,000 feet of the facility. 11. Contours of equal mean annual precipitation depth prepared by the USGS (1969) show that the SMS Briners facility is located between the 12 inch and 14 inch isohyetal contours. DWR adopted these isohyetal contours in their publication California Rainfall Summary, Monthly Total Precipitation, 1849-1980 (DWR, 1981). The facility receives an average of 12.89 inches of precipitation per year as measured at the Manteca station(southwest of SMS Briners). Annual mean precipitation as measured afthe Stockton Fire Station#4 (west of SMS Briners)is 16.61 inches. These two stations do not collect pan evaporation data. The nearest such station appears to be the one located in the City of Lodi (northwest of SMS Briners). Mean pan evaporation is 65.15 inches per year as measured at the City of Lodi Station. 12. The 100-year, 24-hour precipitation event is estimated to be 3.65 inches,based on Department of Water Resources'bulletin entitled Rainfall Depth-Duration-Frequency for California,revised November 1982, updated August 1986. This compares very well to a value of 3.5 inches, obtained from an iso-pluvial map for northern California published by the Western Regional Climate Center(hth2://www.wrce.dri.edu�.