ARCHIVED REPORTS_XR0009094 - Laserfiche WebLink

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Waggins & Associates, Stockton, Calsfornid / Project 309101 July 31, 1991 A block building, reportedly used to house electrical transformer equipment, is also located on the site. Prior to the mid to late -` 1970 ' s Poly chlorinated bi-phenols (PCB ' s) were commonly found in cooling oils used in this type of equipment. TMC found no �- information available at the SJCPHS regarding the use of PCB- containing materials or discharges of these materials at the site. Visits at the site revealed no visual evidence of chemical residues emanating from this building. Mr. Mike Infurna, with the SJCPHS, reported that recent ground water gradient measurements taken at a neighboring site indicated ground water flowed in a north easterly direction. Mr. Infurna ~ also indicated that, over time, ground water of the general site vicinity may vary from a north easterly to a south westerly direction. Further review of agency files also revealed two fueling stations, located in the vicinity of the site, with unauthorized discharges of fuel materials. It is not known if fuel discharges at these neighboring facilities have impacted the sub3ect site. A review of a 1955 aerial photo show features that indicate the site and general vicinity were either vacant or used as agricultural production. Review of subsequent aerial photos (1985 and 1989) , show features of the site and vicinity similar to existing conditions. There were no features observed in these photos indicating activities which may have adversely impacted the site (i. e. open refuse pits, topical staining, surface ponds, etc. ) On June 24 , 1991, nine soil borings were drilled at the site. Five of the borings were terminated near the soil - ground water interface, approximately 27 feet below grade. Four borings were terminated approximately 2--1/2 to 5 feet below grade. Soil samples I TMC Environmencal, Inc. / San Pablo, Calzfornaa 8 of 12