Laserfiche WebLink
Trans Sohal Logistics—Nitrate Loading Section Page 9 of 13 <br /> Our Project Number: LGS140011 <br /> October 8,2014 <br /> longer the effluent remains near the surface, the more treatment is enhanced due to natural <br /> processes within the soil. If the permeable soils exist to the depth of the groundwater table, it is <br /> possible that surface contaminants may be transported fairly rapidly. <br /> 2.2 Groundwater Analysis <br /> 2.2.1 Regional Groundwater <br /> A discussion of regional groundwater, including depth to groundwater and flow gradient is <br /> included in Section 1.4.1. No significant seasonal trends were evident from the maps consulted, <br /> however, the well data reports up to ten feet of variation between spring and fall depth to <br /> groundwater, with spring data reporting the shallower depth to groundwater measurements. <br /> 2.2.2 Potential Ground Water Contamination Issues <br /> A discussion of issues related to potential groundwater contamination is included in Section CZ z) <br /> 1.4.2. <br /> 2.2.3 Current and Future On-Site Ground Water Uses <br /> There are currently noWvells on the site, as noted in Section 1.4.3. Groundwater will not be <br /> developed and used-on the site in the future. Cal Water is reported as the planned water <br /> service for irrigation and domestic purposes. (L- <br /> 2.3 - Sources and Impact of Nitrate to Groundwater <br /> 2.3.1 Current Off-Site Sources of Nitrate <br /> Septic systems, agriculture, and dairies in the area may be the most significant sources of (3 .1) <br /> nitrate in groundwater. Septic tank use in the vicinity is discussed in Section 1.3.4. <br /> 2.3.2 Contribution of Rainfall <br /> An estimate of the quantity and quality of rainfall was required for the nitrate loading analysis. <br /> The estimate of deep percolation of rain is based on the average monthly precipitation of rain <br /> fall and evapotranspiration for Stockton, California. The estimate first determines whether the <br /> average monthly precipitation exceeds average monthly potential evapotranspiration. If so, <br /> then the difference is potential deep percolation. This method does not consider runoff. See <br /> Plate 7 for the data and calculation. 3 Z� <br /> Average potential evapotranspiration was obtained from the California Irrigation Management <br /> Information System (CIMIS). Stockton is located within evapotranspiration zone number 12. <br /> Average rainfall was obtained from the Western Regional Climate Center (Station 048558) for <br /> the South Stockton area. <br /> "04 <br /> ©2014 Neil O.Anderson&Associates,Inc. <br /> A Terracon Company <br />