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18 September 2020 AdvantedGeo <br /> Project No. 20-6116 An Employee-Owned Compony <br /> Page 5 of 16 <br /> ADDRESS: 22886 South Austin Road <br /> LOCATION: 500 feet to northeast <br /> SEPTIC SYSTEM: 1) Permit date August 1988; new installation of septic system: <br /> 1,200-gallon P&L concrete tank with two compartments, distribution box (D-Box), and two <br /> 100-foot long leach lines; 2) Permit date October 2009; replacement: replace leach line <br /> with four 60-foot long leach lines. <br /> ADDRESS: 22579 South Austin Road <br /> LOCATION: 900 feet to north <br /> SEPTIC SYSTEM: 1) Permit date August 1998; new installation of septic system: <br /> 1,200-gallon P&L concrete tank with two compartments, distribution box (D-Box), and <br /> three 80-foot long leach lines. <br /> 3.6. PROPOSED MAXIMUM SEPTIC TANK USAGE ON SITE <br /> There are four (4) existing septic systems at the subject property that service the main <br /> office, southwest residence, southeast residence, and breakroom (Figure 3). <br /> Each current residence on the property has two (2) bedrooms and utilizes their existing <br /> septic system 365 days per year. The existing septic systems will not be altered from the <br /> current configurations. The average and reasonable maximum usage of wastewater for <br /> a two-bedroom home by residents is 100 gallons per day (gpd) for the first bedroom and <br /> 50 gpd for each additional bedroom for a total of 150 gpd for each residence. <br /> The main office and breakroom each utilize a separate septic system. The facility is open <br /> Monday through Friday from 7:00 AM to 4:00 PM. The main office and breakroom will be <br /> used by a maximum of eleven (11) employees during an 8-hour period of time Monday <br /> through Friday (workers). The average and reasonable usage of 5 to 10 gpd per person <br /> is typical for a worker to the site setting, and a maximum usage of 15 to 20 gpd per person <br /> is typical for a worker to the site setting. The maximum usage of wastewater for the main <br /> office and breakroom by the eleven (11) employees is 220 gpd. <br /> There are no plans to install another septic system at the site. <br /> 4.0. GROUNDWATER INFORMATION - REGIONAL HYDROGEOLOGY <br /> The Geologic Map of California, published in 1966 by the California Department of <br /> Conservation Division of Mines and Geology, shows the site area within the Great Valley <br /> Syncline (GVS), a large, elongate, northwest trending structural trough. The GVS is <br /> subdivided into two major divisions designated the Sacramento and San Joaquin Valleys, <br /> which have been filled to the present elevation with thick sequences of sediment ranging <br /> in age from Jurassic to present day, creating a nearly flat-lying alluvial plain extending <br /> from the Tehachapi Mountains in the south to the Klamath Mountains in the north. The <br /> western and eastern boundaries of this province are comprised of the California Coast <br />