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07 Septmber 2021 Project No. 21-6531 Page 4 of 14 ADDRESS: 20142 Little John Road LOCATION: Adjacent property to the south SEPTIC SYSTEM: 1) Permit date July 2004; new installation of septic system: 1,600- gallon concrete tank with two compartments, three 40-foot-long leach lines, and one 36- inch diameter, 25-foot-deep seepage pits. 3.6. PROPOSED MAXIMUM SEPTIC TANK USAGE ON SITE The current residence on the property has for three (3) bedrooms and utilizes the existing septic system 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 100 gallons per day (gpd) for the first bedroom and 50 gpd for each additional bedroom for a total of 200 gpd. The new proposed septic system is planned to be located in the southwestern portion of the property over 100 feet away from the existing onsite domestic water well and the surrounding water wells. The proposed septic system will service the planned three- bedroom modular home to be developed on the property. The proposed septic system will be used by the three-bedroom residence 365 days per year. The average and reasonable maximum usage of wastewater for a three-bedroom home by residents is 100 gpd for the first bedroom and 50 gpd for each additional bedroom for a total of 200 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 continental rocks and deposits and in the Holocene-aged river deposits consisting of gravel, sand, silt, and minor amounts of clay. In general, these geologic materials