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30 July 2019 AdvancedGeo AGE Project No. 19-4772 Envlronn"lentaI Page 4 of 14 ADDRESS: 11569 West Clover Road LOCATION: 150 feet north of property SEPTIC SYSTEM: Permit dates 1959, 1961, and 1977; new construction of septic system; new 800-gallon tank and two leach lines 80 feet long (1959); new 1,600-gallon tank and two leach lines 110 feet long (1961); and repair leach lines (1977). ADDRESS: 11601 West Clover Road LOCATION: 200 feet north of property SEPTIC SYSTEM: Permit date 1977; new construction of septic system; new 1,200- gallon tank, D-Box, and two leach lines 90 feet long. 3.6. PROPOSED MAXIMUM SEPTIC TANK USAGE ON SITE The current single-family residence on the property has three (3) bedrooms and utilizes the existing septic system installed in 1977 under EHD permit number 77-542. The septic system will be used by a maximum of six (6) people per day, 365 days per year. The existing septic system will not be altered from the current configuration. The average and reasonable maximum usage of wastewater for a three-bedroom home by residents is 150 gallons per day (gpd) per bedroom for a total of 450 gpd. l The new proposed septic system is planned to be located in the western portion of the property over 150 feet away from the out of service water well. The proposed septic system will service the planned mobile home to be developed on the property. The proposed mobile home will have two (2) bedrooms. The proposed septic system will be used by a maximum of four (4)-people per day, 365 days per year. The average and reasonable maximum usage of wastewater for a two-bedroom home by residents is 150 gpd per bathroom for a total of 300 gpd.' 4.0. GROUNDWATER INFORMATION - REGIONAL HYDROGEOLOGY The Geologic Map of California, published in 1966 by the California Department of Conservation Division of Mines and Geology, shows the site area within the Great Valley Syncline (GVS), a large, elongate, northwest trending structural trough. The GVS is subdivided into two major divisions designated the Sacramento and San Joaquin Valleys, which have been filled to the present elevation with thick sequences of sediment ranging in age from Jurassic to present day, creating a nearly flat-lying alluvial plain extending from the Tehachapi Mountains in the south to the Klamath Mountains in the north. The western and eastern boundaries of this province are comprised of the California Coast Range and the Sierra Nevada, respectively. Geologically, the area around the property generally consists of Holocene-aged flood-basin deposits of clay, silt, and sand. Miocene to Holocene age-units are located in the surrounding area. These deposits are heterogeneous mix of generally poorly sorted clay, silt, sand, and gravel with some beds of claystone, siltstone, sandstone, and conglomerate (1986). Most of the fresh groundwater in the Central Valley is contained in the post-Eocene-aged