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Soil Suitability/ Nitrate Loading Study Irerracon Buddhist Temple Proposed Dormitory ■ Stockton, California July 11, 2019 ■ Terracon Project No. NA177056 2.1.2 Mass Transport Soil Properties Devries sandy loam soils are located across the site. The USDA Soil Survey of San Joaquin County indicated indurated hardpan may be encountered between 28 inches bgs and 80 inches bgs. Permeability is moderately rapid with slow runoff. The rate of water intake in irrigated areas is 1.5 inches per hour. For homesites with septic systems, the main limitation is depth to hardpan. Leach field permeability can be improved by ripping the hardpan. 2.2 Groundwater Analysis 2.2.1 Regional Groundwater A discussion of regional groundwater, including depth to groundwater and flow gradient is included in Section 1.4.1. No significant seasonal trends were evident from the sources consulted. 2.2.2 Potential Ground Water Contamination Issues A discussion of issues related to potential groundwater contamination is included in Section 1.4.2. 2.2.3 Current and Future On-Site Ground Water Uses According to Ms. Couragee, the existing groundwater well is located north of the assembly hall. Ms. Couragee, indicated the groundwater well is not currently used for drinking water due to elevated contaminants identified in the well. Potable water delivered from offsite sources is stored- ,in toredn five gallon containers on the site and is used for cooking and drinking water. The groundwater well will continue to remain in use for other domestic and landscape needs. 2.3 Sources and Impact of Nitrate to Groundwater 2.3.1 Current Off-Site Sources of Nitrate Agriculture land use and the septic systems in the area may be contributing sources of nitrate to groundwater. A groundwater study titled Addressing Nitrate In California's Drinking Water Technical Report 2 Nitrogen Sources and Loading to Groundwater dated 2012 prepared by the University of California Davis for the Tulare Lake Basin and Salinas Valley, indicated crop land contributed 96% of the human-generated nitrate sources to groundwater. The study indicated other minor contributors to nitrate in groundwater included waste water treatment plants, septic systems, corrals, lagoons and urban runoff. Based on the groundwater study, agricultural land use in the vicinity is anticipated to be the highest contributor of nitrates in groundwater. Other contributors include a dairy located approximately 0.8 miles northeast of the site. Responsive ■ Resourceful ■ Reliable 15