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13 August 2021 Project No. 21-6530 Page 4 of 14 AdvancedGee Ars tmpfoy Company Z ADDRESS: 4435 Virgil Street LOCATION: Adjacent property to the west SEPTIC SYSTEM: 1) Permit date September 1962; new installation of septic system - 800 -gallon concrete tank with two compartments, one (1) 90 -foot -long leach line, and two 48 -inch diameter, 10 -foot -deep seepage pits. Permit date June 2011; repair/addition: addition of one (1) 40 -foot -long leach line and four (4) 16 -foot -long, 8 -foot -deep sumps. ADDRESS: 4449 Virgil Street LOCATION: Adjacent property to the west SEPTIC SYSTEM: 1) Permit date October 1960; new installation of septic system: 1000 - gallon septic tank, two (2) 40 -foot -long leach lines, and one (1) 36 -inch diameter, 12 -foot - deep seepage pit. 2) Permit date May 2020; additions to existing septic system: one 1,200 -gallon tank. Permit date October 2003; repairs and additions to existing septic system and destruction of existing septic tank: Destroy one (1) 1000 -gallon septic tank, addition of one (1) 1,200 -gallon tank with 2 compartments, one (1) 20 -foot leach line, one (1) 4 -foot -wide, 16 -foot -long, 8 -foot -deep sump. 3.6. PROPOSED MAXIMUM SEPTIC TANK USAGE ON SITE The new proposed septic system is planned to be located in the eastern portion of the property over 100 feet away from the proposed location of the onsite domestic water well and the surrounding water wells. The proposed septic system will service the planned three-bedroom 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