SR0081083_SSNL - Laserfiche WebLink

Home Browse Search

13 August 2019 AdvancedGeo AGE Project No. 19-4782 L n v i r o n m e n t a l Page 9 of 14 7.1. CHEMICAL AND PHYSICAL PROPERTIES OF SITE SOILS The dominant soil composition in the general area of the property was inferred from information provided by the United States Department of Agriculture's Soil Geographic Database (USDASGD). The USDASGD soil survey indicates the soil type for the property is composed of Honcut sandy loam (#175) in the southern portion of the property and Veritas fine sandy loam (#266) in the northern portion of the property. Both soil types have 0 to 2 percent slopes. The Honcut sandy loam is composed of alluvium derived from granitic rock sources. Soils are described as well drained; with a high permeability of 1.98 to 5.95 inches per hour (in/hr); and salinity of less than 2.0 millimhos per centimeter (mmhos/cm). Soils in the Honcut sandy loam typically have the same chemical properties between surface grade and 60 inches bsg. The Veritas fine sandy loam is composed of alluvium derived from mixed rock sources. Soils are described as moderately well drained; with a very low permeability; and salinity of less than 4.0 mmhos/cm. Soils in the Veritas fine sandy loam typically have the same chemical properties between surface grade and 54 inches bsg. 7.2. MASS TRANSPORT PROPERTIES OF UNDERLYING SITE SOILS The percolation test has revealed that the soils are semi-permeable to permeable and have moderate water storage. These soils will allow moderate infiltration of water through the surface soils. Permeability is very low to high and the available water capacity is moderate. The longer the effluent remains near the surface, the more treatment is enhanced due to natural processes within the soil. If the permeable soils exist to the depth of the groundwater table, it is possible that surface contaminants may be transported fairly rapidly. 8.0. GROUNDWATER ANALYSIS The subject property is supplied with potable water by the domestic water well on the adjacent property at 17699 ST RT 120; the well is located along the property boundary with the site and 17699 ST RT 120. A groundwater sample was collected from the well (D-1) and analyzed for nitrates as part of this study. 8.1. DESCRIPTION OF LOCAL GROUNDWATER The San Joaquin County Flood Control and Water Conservation District's Lines of Equal Depth to Groundwater Fall 2018 indicates the depth to groundwater is approximately 60 feet bsg. Groundwater flow direction locally appears to be toward the north.