SU0008978 SSNL - Laserfiche WebLink

Home Browse Search

LUCCA WINERY SOIL SUITABILITY & NITRATE LOADING STUDY MAY 2013 Joaquin River. Groundwater in this area seems to remain relatively static, showing some influences due to hydrologic years. SSS§ 2.1, 4.2, 4.4. Since the property was intensely farmed, and since surrounding properties have also been intensely farmed for several decades, the probability for high nitrate concentrations in the underlying groundwater is significant and this was observed in the groundwater sample. The groundwater was sampled at the sites Domestic Well on February 25, 2013. The Nitrate levels were found to be 46.1 mg/L, which exceeds the MCL of 45 mg/L for Nitrate by 1.1 mg/L. NLS§ 2.2, 3.1, SSS§ 4.2. The project has a on-site water well for domestic purposes. The water quality test results from Fruit Growers Laboratory in Stockton, CA are provided as Appendix F. The following Table illustrates the nitrate concentrations found in sampled water source: Table 3 Water Qualty Results Domestic Well Water Quality Test Results Analyte Results MCL Nitrate (mg/L) 46.1 45 DBCP (mg/L) ND 0.0002 E. Surface Water Information Due to the gradient of the area, storm water will mostly remain on-site. The only storm water management system will entail a 2,000 gallon winery wash water collection tank that will capture all storm water that is in contact with the wash station as shown on the site plan in Appendix B. The on-site storm water outside of the wash station will percolate into the ground. Percolating storm water may produce dilution effects to the underlying water table. Groundwater dilution effects can only be truly discerned with groundwater monitoring and modeling. According to a scientific paper authored by Shaw and Turyk (1994), reduction of nitrate concentrations in groundwater can occur primarily through dispersion, or by percolating rainwater, or a water source including effluent water recharge. F. Climatic Data: Rainfall versus Evapotranspiration _ NLS§ 3.2. It is generally and scientifically accepted that when precipitation exceeds evapotranspiration (Eto), deep percolation of surface rainwater can occur. Evapotranspiration refers to water evaporation that takes place both at the soil surface and transpiration by plants. The following Table illustrates rainfall and evapotranspiration for the Ripon area. Precipitation data was obtained from the Soil Survey of San Joaquin County. The conservative "2 years in 10" data was used and not Page 16