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LUCCA WINERY SOIL SUITABILITY & NITRATE LOADING STUDY MAY 2013 Table 2 Percolation Test Results for the Disposal Area Percolation Test Results for the Disposal Area with Corresponding Application Rates in Gallons / Ft2/ Day Sample Depth Below Ground Percolation Rate (min/in) Application Rate (gallons/ft2/day) Surface ft 3.0 1.9 1.200 7.0 6.7 0.971 Application Rate adapted from California State Water Resources Control Board Guidelines for the Design of Sewage Systems and is based on the Perc Rate. D. Groundwater Information NLS§ 2.1, SSS§ 4.1, 4.3. Groundwater depths and elevations throughout San Joaquin County are illustrated on maps published by the County Flood Control and Water Conservation District. The most recent Groundwater Report for the County (Spring 2011) provides groundwater elevations in wells within the South San Joaquin Irrigation District (SSJID). The following is a summary of the wells monitored by the County within SSJID: In Well "P", State Well ID 01S09E34A001M, depth to water in the early 1970's was around 57 feet. In 2011, depth to water was approximately 75 feet below ground surface. Based upon the trend line for the hydrograph, the average annual decline in depth to water for the well is 0.4 ft/year. • In Well "T", State Well ID 01S08E27A001M, depth to water in 1964 was around 40 feet. In 2011, depth to water was approximately 67 feet below ground surface. Based upon the trend line for the hydrograph, the average annual decline in depth to water for the well is 0.8 ft/year. The nearest well to the site Well °V", State Well ID 02S08E08A001 M, depth to water in the early 1990's was around 43 feet. In 2011, depth to water was approximately 44 feet below ground surface. Based upon the trend line for the hydrograph, there appears to be a general trend of increasing water levels. The trend provides an approximate increase in water level of 0.1 feet/year. This increase is potentially due to local groundwater pumping is not prevalent and _ surface water irrigation is mostly utilized. The existing on-site domestic well was constructed in early 1997. The drillers log identified the depth to water level to be 32 feet below ground surface. Upon review of Well "V", depth to water in 1997 was approximately 37 feet. Cross Sections across the county were developed for the 2011 report. Cross-sections ran along Highway 4, 99 and Jack Tone Road. Based upon the trends of groundwater in the area, the directional flow is generally in a northwesterly direction toward the San Page 15