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SITE CHARACTERIZATION <br /> CITY OF STOCK-TON <br /> FIRE STATION NUMBER SEVEN <br /> 1767 WEST HAMMER LANE <br /> STOCKTON, CALIFORNIA <br /> 1.0 IMQDUCTION <br /> This report presents the results of work to characterize the extent of petroleum product <br /> constituent (PPC} migration in sub-surface soil and groundwater at the City of Stockton, <br /> Fire Station Number Seven (site), in Stockton, California. The source of the PPCs was an <br /> apparent release from underground storage tank (UST) maintained at the site until March <br /> 1994. <br /> This work was commissioned by Mr. Robert Murdock of the City of Stockton on April 5, <br /> 1996 with the issuance of the City of Stockton Purchase Order Number 079283. Mr. <br /> Murdock can be contacted at the City of Stockton's Public Works Department at 425 El <br /> Dorado Street, Stockton, California, telephone number (209) 937 - 8829 <br /> The work herein documented was performed by the Environmental Services and Chemical <br /> Laboratory Divisions of Twining. The San Joaquin County Public Health Services <br /> (SJCPHS) is the regulatory agency conducting technical oversight of this project. <br /> 2.0 EU&MSE AND SCOPE <br /> The purpose of the site characterization was to assess and delimit the lateral and vertical <br /> extent of PPC impacted soil and to investigate the presence or absence of PPCs in <br /> L groundwater beneath the site. The following scope of work was conducted to achieve the <br /> stated objective: <br /> • Subsurface soil samples were collected from selected locations at the project site; <br /> • A groundwater sample was collected from a borehole drilled for soil sampling; <br /> 1 • Soil and groundwater samples were chemically analyzed in the laboratory for selected <br /> PPCs; <br /> • Field and analytical data was evaluated to assess the extent of PPC migration in soil <br /> and groundwater; and <br />