WORK PLANS - Laserfiche WebLink

Home Browse Search

1 19 November 2009 AGE-NC Project No. 02-0950 Page 2 of 13 Currently, the Masonite property operates as a door manufacturer. The majority of the former UST area is unpaved (Figure 2). The surrounding sites are used for residential apartments toward the south,a warehouse building towards the east,unpaved vehicle parking towards the north and Lincoln Street towards the west.No public supply wells are located on the property. A UST Unauthorized Release (Leak)/Contamination Site Report(UAR) was filed by San Joaquin County Environmental Health Department(EHD)on 10 April 2002.The responsible party listed on the 2002 UAR is Prem Dor. As a result, the EHD issued a Notice of Responsibility(dated on 16 April 2002) to Prem Dor and directed that a subsurface investigation be performed beneath the former UST area. A copy of the 2002 UAR reports are included in Appendix B. 2.1. REGIONAL GEOLOGIC/HYDROGEOLOGIC SETTING The site is located within the northern San Joaquin Valley which comprises part of the Great Valley geomorphic province of California. The San Joaquin Valley is formed by the Great Valley geosyncline,which is a large, elongate,northwest-trending asymmetrical structural trough (basin). It is bordered by the Coast Ranges to the west, the Klamath Mountains and Cascade Range to the north, and the Sierra Nevada to the east. This trough has been filled with sediments derived from both marine and continental sources. Thickness of the sedimentary fill ranges from thin veneers along the valley edges to greater than 20,000 feet in the south central portion of the valley. The sedimentary formations range in age with the older deposits being primarily marine in origin and the younger deposits being primarily continental. Continental-derived sediments were primarily deposited in lacustrine, fluvial, and alluvial environments with sources being the mountain ranges surrounding the valley(Olmsted and Davis, 1961). The site is located on unconsolidated and semi- consolidated alluvium, lake, playa and terrace deposits of Quaternary age (California Division of Mines and Geology, 1977). The Modesto, Riverbank and Turlock Lake Formations and overlying recent alluvium are the principal sources of domestic ground water in the 13,500-square mile San Joaquin Valley Ground Water Basin (Basin 5-22). Based on the San Joaquin County Flood Control District and Water Conservation District Lines of Equal Depth to Ground Water Fall 2008 map, the estimated depth to ground water in the vicinity of the site is between 10 and 20 feet below surface grade (bsg). Based upon data obtained from San Joaquin County Flood Control District and Water Conservation District Lines ofEqual Elevation of Ground Water Fall 2008 map,the prevailing ground water flow direction in the vicinity of the site is estimated to be northeast.However,flow direction may be both locally and seasonably variable. The Mormon Slough is the nearest surface water feature to the property, located approximately 750 feet north of the site. Water from the Mormon Slough drains to the Stockton Deep Channel, which drains into the San Joaquin River and is primarily used for Advanced GeoEnvironmental,Inc.