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Nitrate Loading Study Flag City#4 ■ Lodi, California Irerracon September 20, 2018 ■ Terracon Project No. NA187043 1.2 Mass Transport Soil Properties The below additional information pertaining to mass transport for each soil type was obtained from the USDA sources listed in Section 1.1. Acampo sandy loam soils comprise approximately 89% of site soils and are located across the majority of the site. The soils consist of moderately well drained soils with moderately rapid permeability, and very low runoff. The rate of water in-take in irrigated areas is anticipated at 1.5 inches per hour. The main limitation for septic tank absorption fields is the depth to hardpan which can be improved by ripping the soil. Devries sandy loam soils comprise approximately 11% of soils and are located along the eastern portion of the site. The soils consist of somewhat poorly drained soils with moderately rapid permeability and very low runoff. The rate of water in-take in irrigated areas is anticipated at 1.5 inches per hour. The main limitation for septic tank absorption fields is the depth to hardpan which can be improved by ripping the soil. The longer effluent remains near the surface, the more treatment is enhanced due to natural processes within the soil. Based on the sandy loam soils and hardpan anticipated for the majority of the site, the potential for effluent to remain near the surface is moderate; therefore, there is a potential leaching from sewage effluent or other surface contaminants may affect groundwater. 2.0 GROUNDWATER ANALYSIS 2.1 Regional Groundwater Based on a review of the San Joaquin County Flood Control and Water Conservation District (SJCFCWCD) Groundwater Reports website, from 2015 to 2016, Spring & Fall depth to groundwater near the site was reported between approximately 20 and 40 feet below ground surface (bgs). Based on a review of groundwater data available on the California Department of Water Resources (DWR) Water Data Library, between the years 1989 and 2013, depth to groundwater measured between approximately 14 to 28 feet bgs at a groundwater well located approximately one quarter mile south of the site. Based on a review of the Lines of Equal Elevation of Groundwater maps available on the SJCFCWCD website, between 2015 and 2016 groundwater flow appeared to have a southerly direction; however, the groundwater flow direction and the depth to shallow, unconfined groundwater, if present, would likely vary depending upon seasonal variations in rainfall and other hydrogeological features.Without the benefit of on-site groundwater monitoring wells surveyed to a datum, groundwater depth and flow direction beneath the site cannot be directly ascertained. Responsive a Resourceful ■ Reliable 4