WORK PLANS - Laserfiche WebLink

Home Browse Search

V single family dwellings are west of the railroad tracks. PLATE I, a portion of a CSAA map, shows the location of the property in relation to other features. GEOLOGIC& GEOMORPHIC PROVINCE: The property is located near the southern terminus of the Sacramento Valley, which is the northern end of what is referred to as the Great Valley of California. It consists of in excess of 20,000 feet of sediments derived primarily from uplift and erosion of the Sierra Nevada Batholith to the east. The area is fairly flat; surface drainage is to the west at about 5'/mile. The Calaveras river & Stockton Diverting Canal are about 1500' to the north; the river drains to the west/southwest, and the diverting canal goes southeast. Based upon USGS topographic maps, (PLATE II,) surface elevation at this location is approximately 20' msl datum. DEPTH TO GROUNDWATER: Based upon San Joaquin County Flood Control District maps, the water table was about 65' bgl during the Spring 1995 sampling; more recent data is not yet available. Groundwater was as high as 40' bgl in the spring of 1983 & 1986. SOILS PROFILE: Based upon published maps, the soil in this area is classified as Landlow Clay. It is generally dark greenish-brown in color, fine textured, underlain by hardpan or hardpan-like material. The soils excavated during tank removal operations consisted primarily of very silty clay, sandy clay, and streaks of harder tan to light brown clay. PRIOR USE OF TANK: The tank was installed in 1975 for the purpose of fueling company vehicles. Annual tightness tests were performed up until tank removal; no leakage was detected during that time. DETAILS OF TANK REMOVAL: On July 2, 1996, Jim Thorpe Oil, Inc. removed a 2,000 gallon gasoline UST & dispenser pump from the property. The tank was in very good condition, and no evidence of contamination was noted. Soil samples were taken at 12' bgl beneath the east & west ends of the removed tank, and from the spoil pile which was temporarily stored on site. The removed spoil was returned to the hole, and the void caused by the removed tank was filled with pea gravel. The site was compacted and covered with asphalt. Copies of the permits, tank tracking records, and other documents are attached as EXHIBIT A. 2