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4.2 Description/discussion of any existing and/or potential groundwater <br /> contamination issues in the general location of the site: Description of existing or potential <br /> groundwater contamination issues in the general location of the site are referred to in Section 4.2 <br /> of the Soil Suitability Report prepared by Dillon& Murphy that is attached in the Appendix. <br /> 4.3 Description of the current use of groundwater at the site and of the future expected use <br /> of groundwater as related to the proposed development project: <br /> The depth to ground water in this area is approximately 10 feet according to the map of"Lines of <br /> Equal Depth to Groundwater" published Spring, 2021, by the San Joaquin County Flood and <br /> Water Conservation District. The gradient descends from east to west. However,percolation test <br /> holes prepared by Dillon&Murphy encountered groundwater at approximately 2.5 feet deep. <br /> The proposed use of groundwater is not expected to change with this project. See Appendix for <br /> the site's depth to groundwater figures. <br /> 5.0 SOURCES AND CALCULATED IMPACT OF NITRATE TO <br /> GROUNDWATER <br /> 5.1 Description of all current off-site sources of nitrate to soil and groundwater in the <br /> general up gradient area and the contribution of nitrate load from these sources to the <br /> project site: Current off-site source of nitrate to soil and groundwater in the general up gradient <br /> area and the contribution of nitrate loads are agricultural operations. The neighboring agricultural <br /> operations with sources of pollution could affect this project site long term and should be <br /> monitored over the years. <br /> 5.2 Description of impact of rainfall contribution of nitrate load to the project site: The <br /> impact of rainfall to nitrate loading was not investigated due to the shallow depth of groundwater <br /> on site. <br /> 5.3 Description of all current on-site sources of nitrate to soil and groundwater and the <br /> contribution of nitrate load from these sources to the project site: The only source of <br /> nitrates existing are the ones derived from any agriculture use and the existing residence. <br /> 5.4 Discussion of all proposed future on-site sources of nitrate to soil and groundwater and <br /> the contribution of nitrate load from these sources to the project site: The proposed future <br /> on-site sources of nitrate loading would be largely the same. Due to the shallow depth of <br /> groundwater encountered an, engineered septic system shall be recommended if an OWTS is <br /> proposed in the future. The remainder of this report has been omitted as there are no additional <br /> proposed nitrate sources to investigate at this time. <br /> 2 <br />