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WASTE DISCHARGE REQUIREMENTS ORDER NO. 5 ALPINE PACKING COMPANY, INC. WASTEWATER TREATMENT SYSTEM, SAN JOAQUIN COUNTY 26. As indicated in the table above, based on one sample event, it appears the TDS concentration in the groundwater below the current land application area is approximately three times higher than that of the groundwater upgradient of the land application or wastewater storage areas. Concentrations of sodium and chloride are also notably higher in wells downgradient of land application areas or wastewater storage locations. This data, coupled with the reported groundwater gradient to the south, indicates that groundwater below the land application area may be impacted by the discharge of wastewater from the facility. 27. The facility is served by two water supply wells. The primary supply well extends to a depth of approximately 300 feet below ground surface (bgs); the secondary supply well is estimated to be approximately 110 feet bgs. No information on the screen interval was provided in the RWD. The locations of the wells are presented on Attachment B. SITE SPECIFIC CONDITIONS 28. Local land use consists of industrial, agricultural and residential uses. The facility has been used as a meat packing facility since the 1940s. The topography of the surrounding area is level. The prevailing wind direction is from the northwest in the summer and to the southeast in the winter months. 29. Domestic waste at the facility is discharged to a septic tank and leachfield. The septic tank and leachfield system is regulated by the San Joaquin County Department of Public Health. 30. The facility and land application areas are outside the 100-year flood zone. 31. Surficial soil is described as poorly drained clay. Permeability is slow (0.06-0.2 hour/in). 32. The mean annual rainfall is 13.38 inches and the 100-year return annual total is 21.83 inches. The annual evapotranspiration rate is 51.03 inches. 33. The facility is within the Lower Mokelumne Hydrologic Area(No. 531.20), as depicted on interagency hydrologic maps prepared by the Department of Water Resources in August 1986. BASIN PLAN, BENEFICIAL USES, AND REGULATORY CONSIDERATIONS 34. The Water Quality Control Plan for the Sacramento River and San Joaquin River Basins, Fourth Edition (hereafter Basin Plan) designates beneficial uses, establishes water quality objectives, contains implementation plans and policies for protecting waters of the basin, and incorporates by reference plans and policies adopted by the State Water Resources Control Board. Pursuant to Section 13263(a) of the California Water Code, waste discharge requirements must implement the Basin Plan. 35. Surface water drainage in the area of the site is to Mosher Slough, which is tributary to the Sacramento San Joaquin Delta. 36. The beneficial uses of the Sacramento San Joaquin Delta are municipal and domestic supply, agricultural irrigation, agricultural stock watering, industrial process supply, industrial service C:Troject Flcs4Sitc Ulptne PackinglWVR-doc