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17 January 2020 AdvancedGeo Project No. 19-4964 An Employee Owned Compony Page 4 of 14 ADDRESS: 382 West Mathews Road LOCATION: Adjacent property to east SEPTIC SYSTEM: 1) Permits dated February 1964 and September 1973 for repairs and additions to existing septic system. ADDRESS: 490 West Mathews Road LOCATION: Adjacent property to west and south SEPTIC SYSTEM: Permit date January 2000; new installation of septic system: 2000- gallon tank with two compartments, distribution box (D-Box), and two 50-foot long leach line. 3.6. PROPOSED MAXIMUM SEPTIC TANK USAGE ON SITE The current single-family residence on the property has two (2) bedrooms and utilizes the existing septic system installed under EHD permit and improved in 2015 under EHD permit number SR0073561. The existing residence is currently occupied and is used 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 two- bedroom home by residents is 140 gallons per day (gpd) per bedroom for a total of 280 gpd. The new proposed septic system is planned to be located in the south portion of the property over 220 feet away from the onsite water well. The proposed septic system will service the planned modular three-bedroom residential 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 140 gpd per bedroom for a total of 420 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