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ADVANCED <br /> SCIENCES,INC. <br /> September 20, 1991 SEP 2 6 1991 <br /> p ENVIPONMENTAL HEALTH <br /> i79 [ "tel% r%h PciifVllTlaE,,V;C-Es <br /> Mr. Charles E. Hunt, R. E. H. S. <br /> Environmental Health Specialist <br /> Environmental Health Division <br /> San Joaquin County Public Health Services <br /> 445 N. San Joaquin Street <br /> P. O. Box 2009 <br /> Stockton, CA 95201 <br /> Subject: Tank Removal Results <br /> Federal Aviation Administration <br /> Stockton Airport ATCT Facility <br /> Los Angeles, California <br /> Dear Mr. Hunt: <br /> This letter has been prepared to provide San Joaquin County Public Health Services (SJCPHS) <br /> with a description of soil sampling, soil analytical methods and results associated with the <br /> removal of an underground 1,000-gallon-capacity diesel tank. The tank was located at the <br /> Federal Aviation Administration (FAA) Stockton Airport Air Traffic Control Tower (ATCT) <br /> facility. Based upon tank removal observations and soil analytical results,no diesel is suspected <br /> to have leaked from the tank due to tank failure. On behalf of the FAA, closure of the facility <br /> is requested from the SJCPHS. <br /> BACKGROUND <br /> The site is located at the Stockton, California Airport in the NW quarter of the NE quarter of <br /> Section 38, Township 1 North, Range 7 West, of the Stockton East 71/2 minute quadrangle, San <br /> Joaquin County, California (Figure 1). The FAA Stockton ATCT facility consists of a air traffic <br /> control tower and an emergency generator formerly supplied by an underground <br /> 1,000-gallon-capacity diesel tank(Figure 2). The facility is at an approximate elevation of 23 feet <br /> above mean sea level(MSL). The FAA contracted with Advanced Sciences,Inc. (ASI),to conduct <br /> soil sampling following the removal of the tank by the FAA. ASI provided the following <br /> services in accordance with the scope of work provided by the FAA. <br /> • Visually assessed the condition of the tank immediately upon removal and observed soil <br /> conditions directly adjacent to and beneath the tank,and under the basal concrete anchor slab; <br /> • Collected three soil samples beneath the tank, and arranged for laboratory analysis of the <br /> samples; and <br /> • Prepared this report. <br /> 4909 Murphy Canyon Road, Suite 400 San Diego, CA 92123-4301 (619)560-8552 FAX(619)560-8538 <br />