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The soil survey by US Department of Agriculture (USDA) indicates that there are two types of soil on this site. The soils are Redding Gravelly Loam and San Joaquin Sandy Loam. The Redding Gravelly Loam is composed of a top layer of 0— 17 inches of gravelly loam, 17—22 inches of clay, followed by 22—60 inches of cemented gravelly material. Approximately 87%of the site is comprised of Redding Gravelly Loam. The San Joaquin Sandy Loam is composed of a top layer of 0— 13 inches of sandy loam, 13 —20 inches of clay, followed by 20—60 inches of indurated soil. Approximately 13% of the site is composed of San Joaquin Sandy Loam. 4.0 GROUNDWATER ANALYSIS 4.1 Description of the depth to groundwater, seasonal fluctuations of groundwater depth, directional flow and gradient: Description of depth to groundwater, seasonal fluctuations of groundwater, directional flow and gradient are referred to in Section 4 of the Soil Suitability Report prepared by Dillon& Murphy that is attached in the Appendix. 4.2 Description/discussion of any existing and/or potential groundwater contamination issues in the general location of the site: Description of existing or potential groundwater contamination issues in the general location of the site are referred to in Section 4.2 of the Soil Suitability Report prepared by Dillon& Murphy that is attached in the Appendix. 4.3 Description of the current use of groundwater at the site and of the future expected use of groundwater as related to the proposed development project: The depth to ground water in this area is approximately 170± feet according to the map of"Lines of Equal Depth to Groundwater" published Spring , 2024, by the San Joaquin County Flood and Water Conservation District. The gradient descends from east to west. This was verified with the California Department of Water Resource's Water Data Library. The results of the historic depth to ground water show that the relative depth has not changed drastically throughout the years. The proposed improvements will not have a negative effect on the current depth to ground water. See appendix for the site's depth groundwater tables and diagrams. 5.0 SOURCES AND CALCULATED IMPACT OF NITRATE TO GROUNDWATER 5.1 Description of all current off-site sources of nitrate to soil and groundwater in the general up gradient area and the contribution of nitrate load from these sources to the project site: Current off-site source of nitrate to soil and groundwater in the general up gradient area are increased by the contribution of nitrate loads from agricultural and residential sites with septic systems with no current impact to the site. The neighboring sites are all residential and or agricultural with no major sources of pollution that could affect this project site. 2