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10 May 2021 Project No. 21-6390 Page 4 of 14 3.3. ON-SITE SEPTIC TANK REPAIR HISTORY Septic wastewater repair permits on file at the EHD for 2121 Zuckerman Road, Stockton, California are included in Appendix B. 3.4. EXISTING SEPTIC TANK USAGE IN THE GENERAL AREA Neighboring properties are zoned for agricultural land use. No liquid wastewater permits were on file at EHD for the neighboring properties. 3.5. PROPOSED MAXIMUM SEPTIC TANK USAGE ON SITE The proposed septic system will be located in the southeastern corner of the project location, approximately 155 feet away from the proposed groundwater well. The proposed septic system will service the planned commercial office building. The office building will be open Monday through Friday from 6:00 AM to 3:00 PM. The septic system will be utilized 260 days per year by approximately forty (40) full-time employees. The reasonable or maximum usage of wastewater for the office building is 30 gallons per day (gpd) per person for a total of 1,200 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 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