SR0082012 SSNL - Laserfiche WebLink

Home Browse Search

16475 TIDE ROAD Project No.2019-00072 Page 14 A geologic well log (Well Completion Report No. WP0037172) for the nearby site located approximately 500 feet northwest of the Site at 15127 French Camp Road indicated hardpan from 4 to 6 feet below ground surface. 2.2 Mass Transport Soil Properties Fine sandy loam and sandy loam,such as the fine-grained soil layers reported for the Veritas soil at the site typically do not provide a large degree of protection between percolating effluent at the surface and ground water aquifers,however,the cemented pan layer reported will. Therefore,soils of this type do not typically present a moderate risk of excessive mass transport of nitrate or other constituents of concern. 3.0 GROUNDWATER ANALYSIS 3.1 Regional and Site-Specific Groundwater The San Joaquin County Flood Control and Water Conservation District(2016)groundwater reports were reviewed to determine the groundwater levels near the Site. The Fall 2016 and Spring 2016 maps are the most current official maps available from the County. According to these maps,(Plates 5 and 6) in Appendix A,groundwater elevation lies between 5 and 0 feet below mean sea level (msl) in the spring and fall,respectively. The elevation of the land,as previously mentioned in Section 1.1, is approximately 60 feet above mean sea level.Therefore,the depth to groundwater(the difference between the elevation of the Site and the elevation of groundwater),ranges between approximately 55 and 60 feet below the ground surface (bgs), depending on the season. The groundwater in the vicinity of the Site appears to flow to the north, toward a cone of depression during the spring, and north-northeast during the fall,at a gradient of approximately 10 feet per mile. 3.2 Potential Groundwater Contamination Issues The Site is located within a rural residential area and near parcels involved in agricultural practices; groundwater contamination can result from activities related to farming practices where chemicals are applied to crops which may permeate to groundwater. The Site and surrounding properties utilize septic systems; leakage from septic tanks or failed septic systems can introduce bacteria to groundwater. 3.3 Current and Future On-Site Groundwater Uses The use of ground water for drinking water is planned for the proposed development. There is currently no domestic well onsite,however,a domestic well is planned for the site. 4.0 SOURCES AND IMPACT OF NITRATE TO GROUNDWATER 4.1 Current Off-Site Sources of Nitrate Septic systems and agriculture in the area may be the most significant sources of nitrate. In an attempt to determine the septic system density for the vicinity of the site,our office reviewed a recent aerial photograph available from GoogleEarthTM.We counted the clusters within approximately one square mile of the site,with the assumption each building cluster has one septic system. Using th' Petraloglx Engineering,Inc- 26675 nc26675 Bruella Road,Galt,Ca 95632 (209)300-5729 up www.petraloglx.com