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PRELIMINARY SITE CHARACTERIZATION WORK PLAN DRY CLEANING FACILITY, LANDING SHOPPING CENTER 3422 WEST HAMMER LANE, SUITE K STOCKTON, SAN JOAQUIN COUNTY, CALIFORNIA. 1.0 INTRODUCTION This work plan outlines the scope of work for conducting a passive soil vapor survey to assess current subsurface soil conditions at an existing dry cleaners located at 3422 West Hammer Lane, Suite K, Stockton, California (site). Based a Phase I investigation report prepared by Paragon Environmental Inc., a dry cleaner facility operated dry cleaning equipment at the site from approximately 1989 to approximately 1994. Storage, use, and disposal of dry cleaning solvents during approximately 1989 to 1994 may present a potential environmental concern at the site. This site characterization is being implemented at the request of Mr. Mark Biagini, Biagini Properties, Inc. This Nvork plan was prepared by the Environmental Services Division of The Twining Laboratories, Inc. (Twining), located in Fresno, California. The services provided by Twining were authorized by Mr. Mark Biagini, Biagini Properties, Inc in a contract dated April 11, 2000. 2.0 PURPOSE AND SCOPE The purpose of this investigation is to conduct a preliminary assessment of subsurface soil in the vicinity of the dry cleaning facility in order to obtain information on the possibility of a former release of dry cleaning solvents into the soil and/or groundwater at the site. The data collected during the Phase II may indicate the need for further investigation, soil and/or groundwater remediation. Permits will be obtained from the appropriate government regulatory agency (San Joaquin County Environmental Health Department) prior to field work. The concern for potential environmental impairment at a former dry cleaning facility is based on the presumption that a release of dry cleaning solvent into the soil and/or groundwater may have occurred. Typically dry cleaning solvent in the liquid phase will migrate rapidly through soil to underlying groundwater without appreciable adherence to soil particles. However, the vapor phase of dry cleaning solvent (and/or daughter compounds) will persist in soil gas for a period of many years after the initial release. The following work scope is proposed to complete the investigation objectives: • Obtain the required permits from the San Joaquin County Environmental Health Department (SJCEHD); 0 Mark the site for Underground Service Alert (USA);