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12 June 2008 <br /> AGE-NC-07-1581 <br /> Page 12 of 17 <br /> 8.2. EXISTING OR POTENTIAL GROUND WATER CONTAMINATION <br /> I <br /> The immediately adjacent and outlying land use for the parcel is agricultural in nature. There are <br /> potential groundwater contamination issues associated with agricultural uses and septic systems.A <br /> review of the DTSC Envirostor Database revealed one LUST site within a two-mile radius of the <br /> CZ site. The site has been closed for more than 10 years and is located more than one-mile from the <br /> subject parcel. <br /> 8.3. CURRENT AND FUTURE USE OF GROUND WATER AT THE SITE <br /> The newly installed water supply well conforms to DWR and EHD standard and will supply the <br /> 0-3) domestic and agricultural (including the proposed winery)uses at the property. <br /> 9.0 IMPACT OF NITRATE TO GROUND WATER <br /> Due to the proposed commercial use of the property and the potential for nitrate leaching into the <br /> ground water from the existing septic systems, a nitrate loading analysis for the future use has been <br /> required by the EHD. <br /> 9.1. CURRENT OFF-SITE SOURCES OF NITRATE <br /> Septic systems and agriculture are sources of nitrates in the area of the site. The Calaveras River <br /> �3 borders the site to the south and also might provide a nitrate source.There are two residences within <br /> 1,000-feet of the site. <br /> 9.2. IMPACT OF RAINFALL CONTRIBUTION TO NITRATE LOAD <br /> The rainfall of the area has been estimated for the nitrate loading analysis. Deep percolation is <br /> estimated by calculating the average monthly rainfall and evapotranspiration of the site area. If <br /> average monthly rainfall exceeds average monthly potential for evapotranspiration(ETo)there is a <br /> potential for deep percolation without consideration for runoff.Average potential ET,,was estimated <br /> from data obtained from the California Irrigation Management Information System (CIMIS) Lodi <br /> West Station#166. The average rain fall data for the area was gathered from the Western Regional <br /> Climate Center summary. The averages were calculated based on data collected between 1961 to <br /> 1990, the yearly rain fall average for the Stockton area was 13.95 inches (Appendix D). <br /> Advanced GeoEnvironmental,Inc. <br />