SU0009972 SSNL - Laserfiche WebLink

Home Browse Search

0 Depth to the water table was measured at 18 ft below grade by sounding the on-site domestic well which correlated with the Depth to Groundwater Maps published by the San Joaquin County Flood Control District. • The Nitrate Loading Calculations and wastewater disposal system operational parameters were formulated from contemporary scientific literature and the San Joaquin County Environmental Health Department Sewage Standards. In summary, the soils testing and investigation has found the indigenous soils under the existing wastewater disposal area to contain a predominately fine-grained silty, sandy material with little clay. This soil has excellent percolation characteristics with some nitrate mitigation capabilities where the soil-effluent interface occurs at the installed depth of 18 inches below grade. II. SOIL SUITABILITY STUDY FINDINGS A. SUBJECT PROPERTY AND SURROUNDING STUDY AREA INFORMATION SSS§ 1.1 As noted on the San Joaquin County Parcel Viewer Maps, the current surrounding land use is composed primarily of agricultural production land in permanent crops to the north south, east and west. Surrounding land has been in agricultural production for many decades. The property is zoned AG-40. SSS§3.1, 2,3.3,3.4,3.5,3.6 Applications on microfiche file with the EHD reveal that there have ben no permits issued for repairs/additions to existing systems within a one-half mile surrounding the project site. This can be attributed to the very low density housing and the silty- sandy indigenous soils. The project site has relatively level terrain; consequently, there was no need to incorporate design considerations for slopes within the wastewater disposal area. Nor is there a dramatic elevational difference between the existing restrooms and the disposal field areas. B. SOIL PHYSICAL CHARACTERISTICS AND ANALYTICAL TEST RESULTS SSS§ 5.2. The United States Department of Agriculture - Soil Conservation Service (USDA-SCS) indicates the on-site soils to consist of a Veritas fine sandy loam(#266). This soil type correlates with the soil type encountered. The USDA-SCS mentions possible hardpan within this soil type. After percolation testing, the 48" boring was extended another three ft to a depth of seven ft. No hardpan was encountered. It is highly unlikely significant hardpan exists in this locale due to the fact there are almond orchards throughout this area that are thriving. This would not be the case if there was significant hardpan. Rust mottling was not observed in the test borings which would be indicative of seasonal soil saturation. 2