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• 1.0 INTRODUCTION 650 Management Corporation (Client) has retained The Park Corporation (Park) to provide environmental services at 151 South Main Street in Manteca, California The site and the vanous well locations are shown on Figures 1 and 2 (Site Location Map and Site Plan) The work performed and described in this report has been requested by the lead agency, the San Joaquin ' County Public Health Services, Environmental Health Division (County), and was performed in accordance with the workplan dated May 24, 1994 and the January 13, 1995 supplemental, which were approved by the County Ms Margaret Lagono from the County was present to observe the dnlhng and sampling activities descnbed in the following report 2.0 SITE HISTORY The site is located in a commercial area of Manteca, California and consists of a large warehouse and an older building once operated by Diamond Lumber Two underground storage tanks (UST) were removed from the site in 1985, one 500-gallon gasoline fuel tank and one of unknown size and usage No soil samples were collected at the time of UST removal, but an unknown quantity of impacted soil associated with the product piping was observed and removed Based on an environmental site assessment of the facility by Blymer Engineers, Inc (BEI), and work completed by Steffen, Robertson and Kirsten, Inc (SRK), further site investigation has been conducted to provide plume definition Adjacent to the west property line is a 25-foot strip of land owned by Union Pacific Railroad and a larger strip owned by Southern Pacific Railroad (SP) There are still active railroad lines on portions of the SP property In addition, there are foundations of pnor buildings No information has been developed regarding the historical uses of these properties 3.0 SUMMARY OF WORK Two borings were drilled on April 5, 1996, and completed as groundwater monitonng wells (MW-7-P and MW-8-P) The wells are located on SP property at the locations shown in Figure 2 Specific tasks completed by Park during the groundwater monitoring program included the following ' Locate and measure depths to groundwater in all the wells, • Purge a minimum of three well volumes of groundwater from each of the wells ' (BEI-MW1, BEI-MW2, BEI-MW3, SRK-MWl, SRK-MW2, SRK-MW3, MW-7-P, and MW-8-P) until pH, temperature and electrical conductivity values were within 10 percent for consecutive measurements, • Collect groundwater samples from all existing wells, 1