FIELD DOCUMENTS - Laserfiche WebLink

Home Browse Search

Site Characterization:Clover li�dle School,51 East Beverly Place, Tracy, CA. Page 3 are of Quaternary to Recent age. The soils are dominantly silty and sandy clays with interbeds of silt, sand and gravel. The general direction of groundwater flow in the neighborhood is to the north towards the Old River anatomic branch of the San Joaquin River and its tributaries that include Tom Paine Slough and Sugar Cut. �. The depth to groundwater in the central Tracy area is typically 7 to 10 ft. It varies seasonally with at its highest elevation usually occurring in February and its lowest in September. Mean groundwater elevations in the area have been �w slowly dropping over the last 20 years. Groundwater gradients are typically 0.003 ft./ft to the north or north-northwest. 2.1 Search for Existing Wells An initial search for the presence of existing off-site agricultural, industrial, AW domestic, municipal and other wells within a 2,000•ft. radius of 51 East Beverly Place was made using United States Geological Survey (USGS) topographical maps and the searchable electronic databases available from Vista Information Solutions, Inc. (Vista) of San Diego,California. No wells within a radius of 2,000 feet of the subject property are shown on the USGS 7.5' series maps of the Union Island and Tracy Quadrangles. The Vista searchable electronic database contains information from 25 Federal and State regulatory agency databases, as well as the Federal Reporting Data System (FRDS), which provides information on wells that are used by 194,000 communities and water-supply systems. A search of the Vista database yielded 46 citations to well sites in the 95376 Zip Code, which includes the Tracy area. The list of wells found by the search is presented in Appendix B. It was possible to eliminate all of the listed sites from consideration with respect to " the Alfred Clover Middle School property because they are located in excess of 2,000 feet from that property. Although no wells within 2000 f1 of the subject property were found by the electronic search of government databases, it is SJC's experience from working in Tracy and similar communities in the Central Valley of California,that those databases frequently do not include a number of domestic or agricultural water supply wells that may be present in a area, particularly if the wells are no longer used or have been abandoned. Accordingly, SJC staff made a tour of the school grounds and the neighboring area to search for wells that may not have been recorded in the databases. The search located a deep water supply well on the school grounds just over 100 ft to the west, and co-gradient from, the former site of the underground fuel storage tank. The location of the well described above is shown on Figure 2. No well log has been found, but the well appears to have been designed to draw water from an SJC