SITE INFORMATION AND CORRESPONDENCE

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INTRODUCTION This report summarizes the removal of a former underground waste oil storage tank located at 687 E. Lockeford St., Lodi, California. Site Location: The site is located at 687 E. Lockeford Street at the northeast corner of East Lockeford Street's intersection with North Beckman Road, in the City of Lodi, in northern San Joaquin County. These two roads serve as frontage roads in the northeast quadrant formed by the intersection of State Highways 99 and 12 (see Figures 1 and 2). The property is situated approximately 2,500 feet south of the Mokelumne River at an elevation of about 54 feet above mean sea level. The area in which the site is located is underlain by older alluvial deposits of the Clements Fan of the ancestral Mokelumne River. At the site, the shallow alluvial deposits consist of silty sands and sandy silts that have been referred to as the Victor Formation in older literature. Individual units are seperated by clayey horizons of variable thicknesses that represent times of non-deposition when soils developed on the alluvial materials. To the south, more recent investigations have redefined the alluvial materials as the Modesto Formation, Riverbank Formation, and Turlock Lake Formation, in increasing order of age. Background/Site History: The site located at 687 E. Lockeford St. Lodi (see Figure] for site location) was purchased in March of 1951 by Claude C. Wood Co. and was used as an equipment fleeting and maintainence facility until 1992. All of the known underground storage tanks were removed in 1986. Cessation and closure of business activities have been ongoing since late 1992. In 1993, previous contractors performed primary demolition of buildings and other structures including the removal of an above ground tank farm located immediately west of the structure labeled "Repair Shop"( see Figure 2). During removal of surface concrete structures within the above ground tank farm containment area in 1