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18 June 2008 AGE-NC-08-1612 Page 5 of 10 SEPTIC SYSTEM: Permit Date3-10-1967 to add (2) 30-foot leach lines and (1)48-inch seepage pit to a depth of 25-feet- existing capacity unknown. 3.7. PROPOSED MAXIMUM SEPTIC TANK USAGE ON SITE The current single family structure is listed as a three bedroom home and has a separate septic system that will not be altered from the current configuration.The current plans call for a parcel subdivision of 5-acres from the southeast corer of the 40-acre parcel for the potential future development of a �. residential property. 4.0. GROUND WATER 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 subject 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 (Page, 1986). Most of the fresh ground water 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 amajor 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 ground water in the 13,500-square mile San Joaquin Valley Ground Water Basin (Basin 5-22). This basin is drained primarily by the San Joaquin River, which is approximately 15 miles west of the subject property. The nearest surface water features in the vicinity of the property are the Calaveras River, located approximately 4 miles to the north of the property; the Morman Slough, located approximately 2.2 miles to the south of the property and the Stockton Diverting Canal, located approximately 2.5 miles to the southwest. Advanced GeoEnvironmental,Inc.