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09 August 2022 AdvancedGeo Project No. 22-6942 An€mployre,OwnedCompany Page 5 of 16 3.6. PROPOSED MAXIMUM SEPTIC TANK USAGE ON SITE The current residence on the property has 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 proposed septic system will be located in the northwestern portion of the project location, a minimum of 100 feet away from the existing groundwater well. The proposed septic system will service the planned industrial building. The industrial building will be open Monday through Friday from 6:00 AM to 4:00 PM. The septic system will be utilized 260 days per year by approximately twelve (12) full-time employees. The reasonable or maximum usage of wastewater for the building is 20 gallons per day (gpd) per person for a total of 240 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. 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 comprise a major widespread aquifer extending hundreds of feet deep and occasionally containing individual confining layers. The Modesto, Riverbank, Turlock Lake Formations and overlying recent alluvium are the principal source of domestic groundwater in the 13,500 - square mile San Joaquin Valley Groundwater Basin (Basin 5-22). This basin is drained primarily by the San Joaquin River, which is approximately nine miles west of the subject property. The nearest surface water feature to the site is Littlejohns Creek, which is approximately 1,000 feet north of the subject property.