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02 March 2023 AdvancedGeo Project No. 23-7124 An Employee-Owned Company Page 4 of 14 ADDRESS: 13672 S. Airport Way LOCATION: 1,000 feet to east SEPTIC SYSTEM: 1) Permit date November 1977; new installation of septic system: 1,200-gallon tank with two compartments, distribution box (D-Box), and three 70-foot-long leach lines. ADDRESS: 865 E. Roth Road LOCATION: 1,000 feet to west SEPTIC SYSTEM: 1) Permit date October 1993; new installation of commercial septic system: 1,600-gallon tank with two compartments, distribution box (D-Box), three 40-foot- long leach lines and three 2-foot by 10-foot by 8-foot sumps. ADDRESS: 11630 S. Airport Way LOCATION: 1,200 feet to the east SEPTIC SYSTEM: 1) Permit date October 1977; new installation of residential septic system: 1,600-gallon tank with two compartments, distribution box (D-Box), three 93.5- foot-long leach lines. 3.6. PROPOSED SEPTIC TANK USAGE ON SITE The proposed septic system will be located approximately 218 feet north of the gate building in the northern portion of parcel 198-200-160 (Figure 2). The proposed septic system will consist of a 2,100-gallon septic tank, five (5) leach lines totaling 472.5 feet, and a 1 ,417.5 square foot filter bed. The septic system will service the proposed gate building and will be used by the gate building 24 hours a day and 7 days a week. The septic system will be utilized 365 days a year by approximately thirty (30) full-time employees. The reasonable or maximum usage of wastewater for the gate building is 30 gallons per day (gpd) per person for a total of 900 gpd. Additional information and calculations are provided in the Onsite Wastewater Treatment System Report for Lathrop Intermodal Expansion Project (Appendix D). 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 is located in the surrounding area.