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ARCADI$ Site Investigation Work Plan 401 North San Jose Street,Stockton,California 1. Introduction ARCADIS has prepared this Site Investigation Work Plan(Work Plan)for the property at 401 N. San Jose Street In Stockton,California("the Site";Figure 1)for Chevron Environmental Management Company (CEMC)which is managing this project for Texaco Inc. ("Texaco"). Site Investigation activities are proposed to Improve understanding of the distribution of contaminants of concern(COOS)at the Slte,the locations of potential underground Infrastructure related to historical site operations,and the site-wide hydrogeology and groundwater flow direction. 2. Site Background The Site(Figure 1)is located in an area primarily occupied by commercial,light Industrial,and recreational land uses(Black and Veatch,2005)and Is bordered by San Jose Street to the east,the Stockton Channel to the south, an unnamed alley to the north,and Delta Marine Sales and Services facility to the west. 2.1 Site Description A bulk fuel terminal was operated at the Site for an unknown number of years prior to 1979,when operations of the terminal reportedly ceased. Texaco has been unable to locate documents concerning its operations at-the Site. However, Texaco documents Indicate that there were five(5)aboveground storage tanks(AST) located at the Site at the time operations ceased In 1879. Texaco reportedly sold the Site in 1984. (SJCEHD, 1984)it Is unknown what activities occurred at the Site afterTexaco sold ft. The Site is currently operating as a boat storage yard. 2.2 Site Geology The Site is located In the San Joaquin River Basin in the Central Valley of California. Neither Texaco nor Arcadis has evaluated geology at the Site,and part of the purpose of the work is to do so. According to reports prepared for others,asphalt and artificial fill are reportedly present at the Site generally to a depth of two to four feet below ground surface(bgs). (Advanced GeoEnvironmental, Inc.,20D8; Geological Technics,2002).The shallow fill is reportedly underlain by silts and clays with thin,discontinuous lenses of sand to about 15 feet bgs. Silty sand with gravel Is reportedly typically encountered to approximately 23 feet bgs underlain by three feet of fine-grained sandy silt and a two-foot silty clay layer. Part of the purpose of the work is to verify these conclusions. Geology within the Site boundary has reportedly not been investigated below 16 feet bgs, 1