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Groundwater Depth and Gradient Sari Joaquin County Flood Control and Water Conservation District produces semi-annual reports on groundwater depths. At the Turner site, the depth to groundwater was 35 feet in the spring of 1984 and 40 feet in the fall of 1984. The gradient or direction of groundwater flow is to the northeast. The Mokelumne River appears to be recharging the groundwater in this area. OPERATION The current operation is to directly land-apply the stillage wastewater as it is produced. An area of approximately 1 .5 acres is used for stillage disposal. The site is not currently divided into checks or sub-plots nor does it have a permanent distribution system for the stillage. The temporary distribution system consists of large hoses connecting the stills with the land application area. The winery washwater flows through a collection system to a sump that is about 5 feet by 5 feet by 6 feet deep. Washwater overflows this sump into a perimeter ditch around the eastern edge of the percolation ponds. The ditch is used to distribute wastewater to a series of 5 ponds. The ponds are about 3 feet deep and vary in size from 0.25 acres to 1.4 acres. The largest pond is Pond 5 which receives primarily stormwat:er runoff. The first four ponds are used as percolation ponds by applying water continuously until they are full. The surface soil is not allowed to dry out except for a period of time in the summer. Odors are generated from the solids that decompose in the ditch and in the ponds. RECOMMENDED IMPROVEMENTS The recommended improvements to the current operation include monitoring, stillage site improvements, and washwater system improvements. These improvements should be completed by August 31 , 1985, prior to the 1985 crushing season. Monitoring The most economical method of flow monitoring for Turner Winery would be to meter the flow from the supply well. A propeller-type saddle meter (such as a McCrometer) could be installed in the outlet piping from the well. A daily reading of the water usage would enable a computation of the wastewater flow. Sanitary wastewater flows are typically 20 gpd per employee. Any water used in wine products could also be subtracted from the water use, along with landscape irrigation, to get the daily wastewater flows. �:GEOAGE S NOLTE AND ASSOCIATES\1 5 ♦NU INv:N(PMI Nr.\fN4:MlYS MnraA 9a i\NNl rt w /