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DEL-TECH Geotechnical Support Services <br /> Leon Boler April 04, 1994 <br /> Production Chemical Industries <br /> 1000 East Channel <br /> Stockton, CA. 95205 <br /> RE: RESULTS OF SOIL BORINGS COMPLETED IN THE STORAGE AREA <br /> Mr. Boler, <br /> On March 26th, Del-Tech advanced three additional soil borings at the locations described on the <br /> attached site sampling map as SB-3, SB-4 and SB-5. The first boring SB-3 is located on a <br /> concrete drive, adjacent to the containment wall of the above ground tanks. At SB-3, there was <br /> a slight indication that volatile aromatic products have been released in this area. At SB-4 the <br /> previous dispenser location, there was no indication of a release of volatile aromatics. At SB-5, <br /> which is at the North/East end of the underground storage tank there is a definite indication of <br /> volatile aromatics in the subsurface starting immediately below the surface of the concrete pad <br /> `. and extending down to approximately 13 feet. At 13 vertical feet along side of the tank, the <br /> product that is present appears to be subsiding. These conclusions are based on the observations <br /> of the soil and screening of the soils with the use of a Portable Photo Ionization Detector <br /> (Thermodyne 580B). <br /> If you have any questions regarding this update or are interested in possible remedial actions, <br /> please call my office. <br /> Sincerely, <br /> U APR 2 5 1994 "gree <br /> Donald E. Light ENVIRONMENTAL HEALTH <br /> PERMIT/SERVICES <br /> 10624 Olive Avenue, Oakdale, CA 95361 (209) 847-8757 • Fax (209) 847-7744 <br />