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+ r <br /> tit <br /> t Utnded Hydroge0bogic AssessmelR Workpar, <br /> 1399 E Yosemite Avenue ManteCa Callornla <br /> In April 1989, Delta Environmental Consultants, Inc (Delta), drilled and installed wells <br /> MW-2 and MW-3 with 2-inch-diameter casing to an approximate depth below surface of <br /> 36 5 feet each On September 26, 1989, three UST and associated product Imes were <br /> removed <br /> In June 1990, Nations Groundwater Associates supervised the abandonment of MW-1 <br /> The well had been damaged during the removal of the UST in September 1989 <br /> Monitoring well MW-1A was then drilled and installed approximately 10 feet east of the <br /> former location of MW-1, and completed as a 2-inch-diameter well to a total depth of <br /> approximately 36 5 feet <br /> Aegis began a program of quarterly groundwater monitoring in February 1991 Monthly <br /> monitoring of groundwater levels and quarterly sampling of groundwater has continued <br /> since then On June 20, 1991, Aegis installed monitoring wells MW-113, MW-4, and MW-5 <br /> on site Wells MW-4 and MW-5 were completed with 4-inch-diameter casing to an <br /> approximate depth of 35 feet below grade Well MW-113 was completed with 6-inch- <br /> diameter casing by "over-coring" the former MW-1A <br /> Documented Unauthorized Release <br /> . Prior to 1989, a leaking turbine pump was documented to have released petroleum <br /> hydrocarbons at the site <br /> Adjacent Land Uses <br /> The property is bounded on the north by a small shopping center, on the west by a fast <br /> food restaurant, on the south by East Yosemite Avenue and on the east by Northwoods <br /> Avenue <br /> Utility Locations <br /> Underground utilities are present beneath the site, the locations are shown on Figure 2 <br /> Prior to beginning fieldwork, the Underground Service Alert will be contacted and all <br /> discernable underground utilities will be marked To ensure against drilling through <br /> subsurface utilities or other potential obstructions, the first 5 feet of each boring will be <br /> augered by hand <br /> Generalized Geology and Hydrogeollogy <br /> The site is located in the Central Valley of California, a structural basin bordered to the <br /> east by the Sierra Nevada and to the west by the Coastal Range Surficial sediments <br /> underlying the site consist of recent alluvium The alluvium overlies the Victor Formation <br /> The alluvial and Victor Formation sediments are composed primarily of discontinuous <br /> lenses of gravel, sand, and clay <br /> 90-098A WPN -3 <br />