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AM <br /> EM, L <br /> , - t " <br /> V <br /> l <br /> x? <br /> e <br /> Wiggins & Associates, Stockton, California / Project 309101 July 31, 1991 <br /> A block building, reportedly used to house electrical transformer <br /> equipment, is also located on the site. prior to the mid to late <br /> 1970's poly chlorinated bi-phenols (PCB's) were commonly found in <br /> cooling oils used in this type of equipment. TMC found no <br /> information available at the sicpHS regarding the use of PCB- <br /> containing materials or discharges of these materials at the site. <br /> visits at the site revealed no visual evidence of chemical residues <br /> emanating from this building. <br /> 5 <br /> Mr. Mike Infurna, -%ith the SJCPHS, reported that recent ground <br /> water gradient measurements taken at a neighboring site indicated <br /> ground water flowed in a north easterly direction. Mr. Infurna <br /> " also indicated that, over time, ground water of the general site <br /> vicinity may vary from a north easterly to a south westerly <br /> direction. <br /> Further review of agency files also revealed two fueling stations, <br /> located in the vicinity of the site, with unauthorized discharges <br /> of fuel materials. it is not known if fuel discharges at these <br /> neighboring facilities have impacted the subject site. <br /> A review of a 1966 aerial photo show features that indicate the <br /> site and general vicinity were either, vacant or used as <br /> agricultural production. Review of subsequent aerial photos (1985 <br /> and 1.989) , show features of the site and vicinity similar to <br /> existing conditions. There were no features observed in these <br /> photos indicating activities which may have adversely impacted the <br /> site (i.e. open refuse pits; topical staining, surface ponds, etc.) <br /> On June 24, 1991, nine soil, borings were drilled at the site. Five <br /> of the borings were terminated near the soil - ground water <br /> interface, approximately 27 feet below grade. Four borings were <br /> terminated approximately 2-1/2 to 5 feet below grade. Soil samples <br /> TMC Environmental, Inc. / San Pablo, California 8 of 12 <br />